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Man Liu
Institute of Earth Sciences, China University of Geosciences (Beijing), Beijing 100083, China

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Journal article
Published: 01 July 2021 in CATENA
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Zinc (Zn) is an essential micronutrient released into soils during rock weathering, and Zn isotope composition has been emerging as a powerful tracer involved in the Earth’s surface processes. To explore the soil development in dry tropical regions and evaluate the influence on the global Zn cycles, stable Zn isotope data were presented for the two pristine low-humic gleysol profiles from the Mun River Basin (MRB), northeast Thailand. The samples exhibit the δ66Zn (relative to JMC 3-0749L standard) from −0.69‰ to 0.32‰. Therein, the Fe nodule-containing soils exhibit a light shift of δ66Zn relative to parent red siltstones (Δ66Znnodule-containing soil–p of S1 = −0.60‰) and the other soils (Δ66ZnII-other zones = −0.66‰ – −0.50‰), indicating that the preferential retention of light Zn isotopes in residual soils is attributed to the adsorption of heavy Zn isotopes onto the surface of secondary Fe oxides. Due to the water insufficiency in the MRB, the redox conditions to control the oxide precipitation are driven by the seasonal alteration of groundwater levels. With the recession of groundwater, Fe oxides precipitate and adsorb heavy Zn isotopes. Besides, heavy Zn isotopes are also incorporated in clay fraction. On the contrary, the saturated water is likely to disrupt the interactions of Zn with Fe phases and clay minerals. In addition, low content of organic matter and Mn oxides and the absence of sulfides limitedly contribute to the light Zn pool in soils. Conclusively, the isotopic signature of Zn indicates that Fe oxide-rich soils are likely to control the heavier Zn isotope composition of dissolved load in rivers relative to continental rocks in dry tropical regions.

ACS Style

Bin Liang; Guilin Han; Man Liu; Xiaoqiang Li. Zn isotope fractionation during the development of low-humic gleysols from the Mun River Basin, northeast Thailand. CATENA 2021, 206, 105565 .

AMA Style

Bin Liang, Guilin Han, Man Liu, Xiaoqiang Li. Zn isotope fractionation during the development of low-humic gleysols from the Mun River Basin, northeast Thailand. CATENA. 2021; 206 ():105565.

Chicago/Turabian Style

Bin Liang; Guilin Han; Man Liu; Xiaoqiang Li. 2021. "Zn isotope fractionation during the development of low-humic gleysols from the Mun River Basin, northeast Thailand." CATENA 206, no. : 105565.

Journal article
Published: 25 May 2021 in Forests
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In order to better constrain calcium cycling in natural soil and in soil used for agriculture, we present the δ44/40Ca values measured in rainwater, groundwater, plants, soil, and bedrock samples from a representative karst forest in SW China. The δ44/40Ca values are found to differ by ≈3.0‰ in the karst forest ecosystem. The Ca isotope compositions and Ca contents of groundwater, rainwater, and bedrock suggest that the Ca of groundwater primarily originates from rainwater and bedrock. The δ44/40Ca values of plants are lower than that of soils, indicating the preferential uptake of light Ca isotopes by plants. The distribution of δ44/40Ca values in the soil profiles (increasing with soil depth) suggests that the recycling of crop-litter abundant with lighter Ca isotope has potential effects on soil Ca isotope composition. The soil Mg/Ca content ratio probably reflects the preferential plant uptake of Ca over Mg and the difference in soil maturity. Light Ca isotopes are more abundant in mature soils than nutrient-depleted soils. The relative abundance in the light Ca isotope (40Ca) is in the following order: farmland > burnt grassland > forests > grassland > shrubland. Our results further indicate that biological fractionation in a soil–plant system is a vital factor for Ca–geochemical transformations in soil surface systems.

ACS Style

Guilin Han; Anton Eisenhauer; Jie Zeng; Man Liu. Calcium Biogeochemical Cycle in a Typical Karst Forest: Evidence from Calcium Isotope Compositions. Forests 2021, 12, 666 .

AMA Style

Guilin Han, Anton Eisenhauer, Jie Zeng, Man Liu. Calcium Biogeochemical Cycle in a Typical Karst Forest: Evidence from Calcium Isotope Compositions. Forests. 2021; 12 (6):666.

Chicago/Turabian Style

Guilin Han; Anton Eisenhauer; Jie Zeng; Man Liu. 2021. "Calcium Biogeochemical Cycle in a Typical Karst Forest: Evidence from Calcium Isotope Compositions." Forests 12, no. 6: 666.

Journal article
Published: 10 May 2020 in Forests
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The profile distributions of soil organic carbon (SOC), soil organic nitrogen (SON), soil pH and soil texture were rarely investigated in the Lancangjiang River Basin. This study aims to present the vertical distributions of these soil properties and provide some insights about how they interact with each other in the two typical soil profiles. A total of 56 soil samples were collected from two soil profiles (LCJ S-1, LCJ S-2) in the Lancangjiang River Basin to analyze the profile distributions of SOC and SON and to determine the effects of soil pH and soil texture. Generally, the contents of SOC and SON decreased with increasing soil depth and SOC contents were higher than SON contents (average SOC vs. SON content: 3.87 g kg−1 vs. 1.92 g kg−1 in LCJ S-1 and 5.19 g kg−1 vs. 0.96 g kg−1 in LCJ S-2). Soil pH ranged from 4.50 to 5.74 in the two soil profiles and generally increased with increasing soil depth. According to the percentages of clay, silt, and sand, most soil samples can be categorized as silty loam. Soil pH values were negatively correlated with C/N ratios (r = −0.66, p < 0.01) and SOC contents (r = −0.52, p < 0.01). Clay contents were positively correlated with C/N ratios (r = 0.43, p < 0.05) and SOC contents (r = 0.42, p < 0.01). The results indicate that soil pH and clay are essential factors influencing the SOC spatial distributions in the two soil profiles.

ACS Style

Wenxiang Zhou; Guilin Han; Man Liu; Jie Zeng; Bin Liang; Jinke Liu; Rui Qu. Determining the Distribution and Interaction of Soil Organic Carbon, Nitrogen, pH and Texture in Soil Profiles: A Case Study in the Lancangjiang River Basin, Southwest China. Forests 2020, 11, 532 .

AMA Style

Wenxiang Zhou, Guilin Han, Man Liu, Jie Zeng, Bin Liang, Jinke Liu, Rui Qu. Determining the Distribution and Interaction of Soil Organic Carbon, Nitrogen, pH and Texture in Soil Profiles: A Case Study in the Lancangjiang River Basin, Southwest China. Forests. 2020; 11 (5):532.

Chicago/Turabian Style

Wenxiang Zhou; Guilin Han; Man Liu; Jie Zeng; Bin Liang; Jinke Liu; Rui Qu. 2020. "Determining the Distribution and Interaction of Soil Organic Carbon, Nitrogen, pH and Texture in Soil Profiles: A Case Study in the Lancangjiang River Basin, Southwest China." Forests 11, no. 5: 532.

Journal article
Published: 07 March 2020 in International Journal of Environmental Research and Public Health
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Exploring the enrichment and controlling factors of heavy metals in soils is essential because heavy metals can cause severe soil contamination and threaten human health when they are excessively enriched in soils. Soil samples (total 103) from six soil profiles (T1 to T6) in the Mun River Basin, Northeast Thailand, were collected for the analyses of the content of heavy metals, including Sc, V, Co, Ni, Mo, Ba. The average contents of soil heavy metals decrease in the following order: Ba, V, Ni, Sc, Co, and Mo (T1, T3, T4 and T5); Ni, V, Ba, Co, Sc, Mo, and Ba (T2); Ba, V, Sc, Ni, Mo, and Co (T6). An enrichment factor (EF) and geoaccumulation index were calculated to assess the degree of heavy metal contamination in the soils. The EFs of these heavy metals in most samples range from 0 to 1.5, which reveals that most heavy metals are slightly enriched. Geoaccumulation indexes show that only the topsoil of T1 and T2 is slightly contaminated by Ba, Sc, Ni, and V. Soil organic carbon (SOC), soil pH and soil texture are significantly positively correlated with most heavy metals, except for a negative correlation between soil pH and Mo content. In conclusion, the influence of heavy metals on soils in the study area is slight and SOC, soil pH, soil texture dominate the behavior of heavy metals.

ACS Style

Wenxiang Zhou; Guilin Han; Man Liu; Chao Song; Xiaoqiang Li; Fairda Malem. Vertical Distribution and Controlling Factors Exploration of Sc, V, Co, Ni, Mo and Ba in Six Soil Profiles of The Mun River Basin, Northeast Thailand. International Journal of Environmental Research and Public Health 2020, 17, 1745 .

AMA Style

Wenxiang Zhou, Guilin Han, Man Liu, Chao Song, Xiaoqiang Li, Fairda Malem. Vertical Distribution and Controlling Factors Exploration of Sc, V, Co, Ni, Mo and Ba in Six Soil Profiles of The Mun River Basin, Northeast Thailand. International Journal of Environmental Research and Public Health. 2020; 17 (5):1745.

Chicago/Turabian Style

Wenxiang Zhou; Guilin Han; Man Liu; Chao Song; Xiaoqiang Li; Fairda Malem. 2020. "Vertical Distribution and Controlling Factors Exploration of Sc, V, Co, Ni, Mo and Ba in Six Soil Profiles of The Mun River Basin, Northeast Thailand." International Journal of Environmental Research and Public Health 17, no. 5: 1745.

Journal article
Published: 28 January 2020 in International Journal of Environmental Research and Public Health
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Soil erosion has become a serious ecological problem in many catchments. Soil erodibility K factor can be estimated based on a series of soil properties, however, the identification of dominant soil properties that affect K factor prediction at different soil types has been little concerned. In this study, 3 soil profiles from the Jiulongjiang River Catchment (JRC) of granite region in Fujian province and 18 soil profiles from the Chenqi Catchment (CC) of karst region in Guizhou province were selected. Soil properties, including soil particle size distribution, soil organic carbon (SOC) and soil organic nitrogen (SON) content, and soil pH, were determined, and the K factors were estimated in the erosion productivity impact calculator (EPIC) model. The soils in the granite region were characteristic for coarse texture, low SOC and SON, and strong acidity compared with limestone soils. Although the K factors in both regions ranged from 0.009 to 0.018, they were overestimated in limestone soils due to frequent soil aggregation, which enhanced soil permeability, hence reduced soil erodibility. The results of principal component analysis (PCA) and structural equation model (SEM) showed that (1) K factor estimation in the soils of the granite region mainly depended on soil texture, of which silt was the most important factor; (2) while K factor in limestone soils was mainly controlled by soil organic matter (SOM) content, other soil properties, including soil pH, clay and silt contents, could indirectly affect prediction of K factor by affecting SOM accumulation.

ACS Style

Man Liu; Guilin Han; Xiaoqiang Li; Shitong Zhang; Wenxiang Zhou; Qian Zhang; Zhang. Effects of Soil Properties on K Factor in the Granite and Limestone Regions of China. International Journal of Environmental Research and Public Health 2020, 17, 801 .

AMA Style

Man Liu, Guilin Han, Xiaoqiang Li, Shitong Zhang, Wenxiang Zhou, Qian Zhang, Zhang. Effects of Soil Properties on K Factor in the Granite and Limestone Regions of China. International Journal of Environmental Research and Public Health. 2020; 17 (3):801.

Chicago/Turabian Style

Man Liu; Guilin Han; Xiaoqiang Li; Shitong Zhang; Wenxiang Zhou; Qian Zhang; Zhang. 2020. "Effects of Soil Properties on K Factor in the Granite and Limestone Regions of China." International Journal of Environmental Research and Public Health 17, no. 3: 801.

Journal article
Published: 23 January 2020 in International Journal of Environmental Research and Public Health
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Dissolved heavy metals are not only the essential micronutrients, but also the toxic elements for human bodies. To investigate the heavy metal sources and assess the water quality of the Lancangjiang River, dissolved Cr, Ni, Cu, Zn, Mo, and Pb were detected in this study. The results show that dissolved Ni and Mo, Cr and Pb, and Cu and Zn were similarly distributed within the drainage basin. The correlation analysis exhibited that dissolved Ni and Mo had correlation with water parameter, and dissolved Cu was weakly correlated with Ni, indicating that they might be affected by natural processes. The principal component analysis explained 68.342% of the total variance for three principal components, of which dissolved Ni, Mo, and Cu were controlled by natural inputs; dissolved Cu and Cr were affected by anthropogenic activities; and dissolved Zn was influenced by agricultural activities in the downstream. The water quality showed that the water in upstream was worse than in midstream and downstream, and the whole drainage basin had water of excellent quality. Water within the drainage basin poses no risks to human bodies via daily diets and dermal routes. Dissolved Zn, Cu, and Mo occupied the major proportion of heavy metals transporting into the Mekong River. The agricultural inputs of dissolved Zn might pose potential risks to the Mekong River.

ACS Style

Bin Liang; Guilin Han; Jie Zeng; Rui Qu; Man Liu; Jinke Liu; Liu. Spatial Variation and Source of Dissolved Heavy Metals in the Lancangjiang River, Southwest China. International Journal of Environmental Research and Public Health 2020, 17, 732 .

AMA Style

Bin Liang, Guilin Han, Jie Zeng, Rui Qu, Man Liu, Jinke Liu, Liu. Spatial Variation and Source of Dissolved Heavy Metals in the Lancangjiang River, Southwest China. International Journal of Environmental Research and Public Health. 2020; 17 (3):732.

Chicago/Turabian Style

Bin Liang; Guilin Han; Jie Zeng; Rui Qu; Man Liu; Jinke Liu; Liu. 2020. "Spatial Variation and Source of Dissolved Heavy Metals in the Lancangjiang River, Southwest China." International Journal of Environmental Research and Public Health 17, no. 3: 732.

Journal article
Published: 07 January 2020 in Sustainability
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Exploring the distributions of rare earth elements (REEs) in soil profiles is essential to understanding how natural and anthropogenic factors influence the geochemical behaviors of REEs. This study aimed to learn about the distribution characteristics of REEs in soils, including their fractionation and enrichment, and to explore the influence of soil pH and soil organic carbon (SOC) on REEs. One hundred and three samples were collected from six soil profiles under different land uses (paddy field: T1, T3; forest land: T2, T6; wasteland: T4; building site: T5) in the Mun River Basin, Northeast Thailand. The average total REE contents (∑REE) are much lower (

ACS Style

Wenxiang Zhou; Guilin Han; Man Liu; Chao Song; Xiaoqiang Li. Geochemical Distribution Characteristics of Rare Earth Elements in Different Soil Profiles in Mun River Basin, Northeast Thailand. Sustainability 2020, 12, 457 .

AMA Style

Wenxiang Zhou, Guilin Han, Man Liu, Chao Song, Xiaoqiang Li. Geochemical Distribution Characteristics of Rare Earth Elements in Different Soil Profiles in Mun River Basin, Northeast Thailand. Sustainability. 2020; 12 (2):457.

Chicago/Turabian Style

Wenxiang Zhou; Guilin Han; Man Liu; Chao Song; Xiaoqiang Li. 2020. "Geochemical Distribution Characteristics of Rare Earth Elements in Different Soil Profiles in Mun River Basin, Northeast Thailand." Sustainability 12, no. 2: 457.

Journal article
Published: 05 January 2020 in International Journal of Environmental Research and Public Health
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To identify whether the iron (Fe) mining area in the Jiulongjiang River basin (JRB) has an influence on the mercury in the forest soil, the spatial distribution patterns of mercury’s behavior on different controlling factors were analyzed, and a potential ecological risk assessment was done. A total of 107 soil samples were collected from two forest soil profiles, one profile near the Fe mining area and the other far from it. The soil near the mining area had a moderate potential ecological risk with high Fe content rich in the upper layer of soil (70 cm) of soil, respectively. The high Fe content in the upper layer of soil will compete for the adsorption of mercury by SOC, leading to the poor correlation between SOC and THg.

ACS Style

Rui Qu; Guilin Han; Man Liu; Kunhua Yang; Xiaoqiang Li; Jinke Liu. Fe, Rather Than Soil Organic Matter, as a Controlling Factor of Hg Distribution in Subsurface Forest Soil in an Iron Mining Area. International Journal of Environmental Research and Public Health 2020, 17, 359 .

AMA Style

Rui Qu, Guilin Han, Man Liu, Kunhua Yang, Xiaoqiang Li, Jinke Liu. Fe, Rather Than Soil Organic Matter, as a Controlling Factor of Hg Distribution in Subsurface Forest Soil in an Iron Mining Area. International Journal of Environmental Research and Public Health. 2020; 17 (1):359.

Chicago/Turabian Style

Rui Qu; Guilin Han; Man Liu; Kunhua Yang; Xiaoqiang Li; Jinke Liu. 2020. "Fe, Rather Than Soil Organic Matter, as a Controlling Factor of Hg Distribution in Subsurface Forest Soil in an Iron Mining Area." International Journal of Environmental Research and Public Health 17, no. 1: 359.

Journal article
Published: 05 December 2019 in International Journal of Environmental Research and Public Health
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Climate changes and other human activities have substantially altered the hydrological cycle with respect to elevation. In this study, longitudinal patterns in the stable isotopic composition (δ2H and δ18O) of Lancang River water, originating from the Qinghai–Tibetan Plateau, are presented, and several controlling factors in the wet season are hypothesized. Lancang River water δ2H (−145.2‰ to −60.7‰) and δ18O (−18.51‰ to −8.49‰) were low but close to those of the Global Meteoric Water Line. In the upper reaches of the river, δ2H decreased longitudinally, potentially due to groundwater inputs and melting ground ice in the headwater zone and to an increasing proportion of glacier meltwater with decreasing elevation. In the middle reaches of the river, δ2H values increased slowly moving downstream, likely due to shifts in precipitation inputs, as evidenced by the isotopic composition of tributaries to the main stream. In the lower reaches of the river, the isotopic composition was relatively invariant, potentially related to the presence of large artificial reservoirs that increase the water resident time. The results reveal different hydrological patterns along an alpine river in central Asia associated with both natural and anthropogenic processes. Understanding the degree and type of human interference with the water cycle in this region could improve water management and water security.

ACS Style

Kunhua Yang; Guilin Han; Jie Zeng; Bin Liang; Rui Qu; Jinke Liu; Man Liu; Liu. Spatial Variation and Controlling Factors of H and O Isotopes in Lancang River Water, Southwest China. International Journal of Environmental Research and Public Health 2019, 16, 4932 .

AMA Style

Kunhua Yang, Guilin Han, Jie Zeng, Bin Liang, Rui Qu, Jinke Liu, Man Liu, Liu. Spatial Variation and Controlling Factors of H and O Isotopes in Lancang River Water, Southwest China. International Journal of Environmental Research and Public Health. 2019; 16 (24):4932.

Chicago/Turabian Style

Kunhua Yang; Guilin Han; Jie Zeng; Bin Liang; Rui Qu; Jinke Liu; Man Liu; Liu. 2019. "Spatial Variation and Controlling Factors of H and O Isotopes in Lancang River Water, Southwest China." International Journal of Environmental Research and Public Health 16, no. 24: 4932.

Journal article
Published: 23 November 2019 in International Journal of Environmental Research and Public Health
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A total of 63 soil samples were collected from three soil profiles (yellow soil, red loam, red soil) from Jiulongjiang river catchment to investigate the distribution, controlling factors, and toxic risks of heavy metals, including Cr, Mn, Fe, Cu, Zn, Cd, Pb, and Ni. The results showed that Cr and Cd in soils were enriched. The relationships between heavy metals and soil properties were assessed by principal component analysis. The results indicated that soil organic matter (SOM) played a fundamental role in controlling Cd and Pb in yellow soil and red loam sites. The Cd was significantly correlated with Pb and Cu, and Cr, Zn, Ni, Fe displayed strong correlations with each other, however, no statistical correlation was found between Cd and Cr. The enrichment factor and geoaccumulation index analyses showed that the soils in the study area were contaminated by Cd. Potential ecological risk analyses indicated that Cd posed a considerable ecological risk in yellow soils, and posed a moderate ecological risk in red loams and red soils.

ACS Style

Qian Zhang; Guilin Han; Man Liu; Xiaoqiang Li; Lingqing Wang; Bin Liang; Han; Liu; Li; Wang. Distribution and Contamination Assessment of Soil Heavy Metals in the Jiulongjiang River Catchment, Southeast China. International Journal of Environmental Research and Public Health 2019, 16, 4674 .

AMA Style

Qian Zhang, Guilin Han, Man Liu, Xiaoqiang Li, Lingqing Wang, Bin Liang, Han, Liu, Li, Wang. Distribution and Contamination Assessment of Soil Heavy Metals in the Jiulongjiang River Catchment, Southeast China. International Journal of Environmental Research and Public Health. 2019; 16 (23):4674.

Chicago/Turabian Style

Qian Zhang; Guilin Han; Man Liu; Xiaoqiang Li; Lingqing Wang; Bin Liang; Han; Liu; Li; Wang. 2019. "Distribution and Contamination Assessment of Soil Heavy Metals in the Jiulongjiang River Catchment, Southeast China." International Journal of Environmental Research and Public Health 16, no. 23: 4674.

Journal article
Published: 23 November 2019 in International Journal of Environmental Research and Public Health
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To examine the chemical composition, potential sources of solutes, and water quality of Lancangjiang River, the concentrations of major ions (Ca2+, Mg2+, Na+, K+, HCO3−, SO42−, Cl− and NO3−) in 45 river water samples collected in July and August 2019 were determined. Ca2+ and HCO3− are the predominant ions in river water. The extremely low K+ and NO3− concentrations and the sparse population suggest that the anthropogenic inputs are limited. The Pearson correlation coefficients and the elemental ratios Ca2+/Na+ versus Mg2+/Na+, Ca2+/Na versus HCO3−/Na+, [Ca2+ + Mg2+]/[HCO3−] versus [SO42−]/[HCO3−] reveal the mixing processes of different sources; the chemical composition of the river water is controlled by the mixture of carbonate weathering, evaporite weathering and silicate weathering inputs. To quantify the contributions of atmospheric input and rock dissolution, the forward method is employed in this study, which is based on the mass balance equation. The calculation results suggest the carbonate weathering inputs and gypsum dissolution make up the majority of the riverine cations, while silicate weathering and halite dissolution constitutes a relatively small proportion, the contributions of the atmospheric input are limited. The fast dissolution rate of evaporite and carbonate minerals and their lithologic distributions should be the key factor. To evaluate the water quality for drinking and irrigation purposes, the drinking water quality guidelines and the calculated parameters were employed, including sodium adsorption ratio (SAR), soluble sodium percentage (Na%,) and residual sodium carbonate (RSC). The assessments indicate that the river waters in the middle-lower reaches are generally suitable for irrigation and drinking purpose, and will not lead to health and soil problems, such as soil compaction and salinization. While in the upper reaches, the dissolution of carbonate and gypsum minerals transport abundant ions into river water and the river waters are not appropriate to use directly. This result highlights that the water quality status can also be affected by natural weathering processes in the area without anthropogenic inputs, where the long-time monitoring of water quality is also necessary.

ACS Style

Jinke Liu; Guilin Han; Man Liu; Jie Zeng; Bin Liang; Rui Qu. Distribution, Sources and Water Quality Evaluation of the Riverine Solutes: A Case Study in the Lancangjiang River Basin, Tibetan Plateau. International Journal of Environmental Research and Public Health 2019, 16, 4670 .

AMA Style

Jinke Liu, Guilin Han, Man Liu, Jie Zeng, Bin Liang, Rui Qu. Distribution, Sources and Water Quality Evaluation of the Riverine Solutes: A Case Study in the Lancangjiang River Basin, Tibetan Plateau. International Journal of Environmental Research and Public Health. 2019; 16 (23):4670.

Chicago/Turabian Style

Jinke Liu; Guilin Han; Man Liu; Jie Zeng; Bin Liang; Rui Qu. 2019. "Distribution, Sources and Water Quality Evaluation of the Riverine Solutes: A Case Study in the Lancangjiang River Basin, Tibetan Plateau." International Journal of Environmental Research and Public Health 16, no. 23: 4670.

Journal article
Published: 26 October 2019 in International Journal of Environmental Research and Public Health
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To determine the geochemical characteristics and contamination of soil mercury in the Mun River basin, northeast Thailand, the vertical mercury distribution patterns and mercury contamination levels in six soil profiles under different land uses are studied. A total of 240 soil samples collected from agricultural land, abandoned agricultural land, and woodland were analyzed by an RA-915M mercury analyzer to determine the total mercury (THg) content, which ranged from 0.13 to 69.40 μg∙kg-1 in the study area. In the soil cultivation layer (0-30 cm), the average content of THg in the woodland (15.89 μg∙kg-1) and the agricultural land (13.48 μg∙kg-1) were higher than that in the abandoned agricultural land (4.08 μg∙kg-1), indicating that the plants or crops could increase the content of mercury in the surface soil layer. The total organic carbon (TOC) and iron content with high positive correlations with the THg content significantly contributed to the adsorption of soil mercury. Moreover, a higher pH value in the soil and a finer grain size in soil texture can be beneficial for the enrichment of mercury. A geoaccumulation index was used to evaluate the contamination of mercury, showing that this area had a slight contamination, and a few soil sites were moderate contamination.

ACS Style

Rui Qu; Guilin Han; Man Liu; Xiaoqiang Li. The Mercury Behavior and Contamination in Soil Profiles in Mun River Basin, Northeast Thailand. International Journal of Environmental Research and Public Health 2019, 16, 4131 .

AMA Style

Rui Qu, Guilin Han, Man Liu, Xiaoqiang Li. The Mercury Behavior and Contamination in Soil Profiles in Mun River Basin, Northeast Thailand. International Journal of Environmental Research and Public Health. 2019; 16 (21):4131.

Chicago/Turabian Style

Rui Qu; Guilin Han; Man Liu; Xiaoqiang Li. 2019. "The Mercury Behavior and Contamination in Soil Profiles in Mun River Basin, Northeast Thailand." International Journal of Environmental Research and Public Health 16, no. 21: 4131.

Journal article
Published: 10 October 2019 in International Journal of Environmental Research and Public Health
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Soil aggregate stability can indicate soil quality, and affects soil organic carbon (SOC) and soil organic nitrogen (SON) sequestration. However, for erodible soils, the effects of soil aggregate stability on SOC and SON under land use change are not well known. In this study, soil aggregate distribution, SOC and SON content, soil aggregate stability, and soil erodibility were determined in the soils at different depths along the stages following agricultural abandonment, including cropland, abandoned cropland, and native vegetation land in an erodible region of Southwest China. Soil aggregation, soil aggregate stability, and SOC and SON content in the 0-20 cm depth soils increased after agricultural abandonment, but soil texture and soil erodibility were not affected by land use change. Soil erodibility remained in a low level when SOC contents were over 20 g·kg-1, and it significantly increased with the loss of soil organic matter (SOM). The SOC and SON contents increased with soil aggregate stability. This study suggests that rapidly recovered soil aggregate stability after agricultural abandonment promotes SOM sequestration, whereas sufficient SOM can effectively maintain soil quality in karst ecological restoration.

ACS Style

Man Liu; Guilin Han; Qian Zhang. Effects of Soil Aggregate Stability on Soil Organic Carbon and Nitrogen under Land Use Change in an Erodible Region in Southwest China. International Journal of Environmental Research and Public Health 2019, 16, 3809 .

AMA Style

Man Liu, Guilin Han, Qian Zhang. Effects of Soil Aggregate Stability on Soil Organic Carbon and Nitrogen under Land Use Change in an Erodible Region in Southwest China. International Journal of Environmental Research and Public Health. 2019; 16 (20):3809.

Chicago/Turabian Style

Man Liu; Guilin Han; Qian Zhang. 2019. "Effects of Soil Aggregate Stability on Soil Organic Carbon and Nitrogen under Land Use Change in an Erodible Region in Southwest China." International Journal of Environmental Research and Public Health 16, no. 20: 3809.

Journal article
Published: 14 September 2019 in International Journal of Environmental Research and Public Health
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Dissolved inorganic carbon isotope composition (δ13CDIC), together with major ion concentrations were measured in the Mun River and its tributaries in March 2018 to constrain the origins and cycling of dissolved inorganic carbon. In the surface water samples, the DIC content ranged from 185 to 5897 μmol/L (average of 1376 μmol/L), and the δ13CDIC of surface water ranged from -19.6‱ to -2.7‱. In spite of the high variability in DIC concentrations and partial pressure of carbon dioxide (pCO2), the δ13CDIC values of the groundwater were relatively consistent, with a mean value of -16.9 ± 1.4‱ (n = 9). Spatial changes occurred in the direction and magnitude of CO2 flux through water-air interface (FCO2). In the dry season, fluxes varied from -6 to 1826 mmol/(m2·d) with an average of 240 mmol/(m2·d). In addition to the dominant control on hydrochemistry and dissolved inorganic carbon isotope composition by the rock weathering, the impacts from anthropogenic activities were also observed in the Mun River, especially higher DIC concentration of waste water from urban activities. These human disturbances may affect the accurate estimate contributions of carbon dioxide from tropical rivers to the atmospheric carbon budgets.

ACS Style

Xiaoqiang Li; Guilin Han; Man Liu; Chao Song; Qian Zhang; Kunhua Yang; Jinke Liu. Hydrochemistry and Dissolved Inorganic Carbon (DIC) Cycling in a Tropical Agricultural River, Mun River Basin, Northeast Thailand. International Journal of Environmental Research and Public Health 2019, 16, 3410 .

AMA Style

Xiaoqiang Li, Guilin Han, Man Liu, Chao Song, Qian Zhang, Kunhua Yang, Jinke Liu. Hydrochemistry and Dissolved Inorganic Carbon (DIC) Cycling in a Tropical Agricultural River, Mun River Basin, Northeast Thailand. International Journal of Environmental Research and Public Health. 2019; 16 (18):3410.

Chicago/Turabian Style

Xiaoqiang Li; Guilin Han; Man Liu; Chao Song; Qian Zhang; Kunhua Yang; Jinke Liu. 2019. "Hydrochemistry and Dissolved Inorganic Carbon (DIC) Cycling in a Tropical Agricultural River, Mun River Basin, Northeast Thailand." International Journal of Environmental Research and Public Health 16, no. 18: 3410.

Journal article
Published: 11 September 2019 in Sustainability
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Soil samples from eight soil profiles under different land-use types were collected at the Puding Karst Critical Zone Observatory, Southwest China, to investigate the distribution, fractionation, and controlling factors of rare earth elements (REEs). The total REEs contents in topsoil ranged from 149.97 to 247.74 mg kg−1, the contents in most topsoil were higher than local soil background value (202.60 mg kg−1), and the highest content was observed in topsoil under cropland. The REEs contents in surface soils from lower slopes sites were higher than that of middle and upper slope sites, and the highest contents were observed in cropland. The PAAS-normalized REEs pattern in soils showed MREEs significantly enriched relative to LREEs and HREEs, and HREEs were enriched relative to LREEs. The results showed that clay content, pH, soil organic carbon, total phosphorus, and Fe content were the main factors influencing the distribution of REEs in karst soils, and soil organic carbon (SOC), Fe content showed better linear relationship with REEs.

ACS Style

Qian Zhang; Guilin Han; Man Liu; Lingqing Wang. Geochemical Characteristics of Rare Earth Elements in Soils from Puding Karst Critical Zone Observatory, Southwest China. Sustainability 2019, 11, 4963 .

AMA Style

Qian Zhang, Guilin Han, Man Liu, Lingqing Wang. Geochemical Characteristics of Rare Earth Elements in Soils from Puding Karst Critical Zone Observatory, Southwest China. Sustainability. 2019; 11 (18):4963.

Chicago/Turabian Style

Qian Zhang; Guilin Han; Man Liu; Lingqing Wang. 2019. "Geochemical Characteristics of Rare Earth Elements in Soils from Puding Karst Critical Zone Observatory, Southwest China." Sustainability 11, no. 18: 4963.

Journal article
Published: 07 May 2019 in Water
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The nutrient contents of Mun River water in northeast Thailand during the dry season were measured to investigate the effect of human activities on dissolved load species. Dissolved organic carbon (DOC) values varied from 2.5 to 17.1 mg/L, averaging 9.0 mg/L; dissolved inorganic nitrogen (DIN) ranged between 0.12 and 0.11 mg/L; Cl− values ranged from 1.7 to 668.6 mg/L, with an average value of 84.8 mg/L; dissolved silicon (DSi) varied from 1.7 to 9.9 mg/L; and SO42− values averaged 8.9 mg/L. DOC, Cl−, and SO42− contents decreased with the flow direction. The high concentrations of DOC, K+, Cl−, and SO42− in the upper reaches were closely related to anthropogenic inputs, specifically industrial sewage. The covariation demonstrated that these dissolved loads may have the same sources. In other regions, Cl− contents were derived from weathering products. DIN contents maintained the same level on the river, and few sampling sites with high concentrations of DIN were influenced by point source pollution. The extremely low P concentrations limited algal growth, and the DSi showed no clear relationship with N and K, indicating that DSi in the Mun River was controlled by the weathering input rather than biological effects. The exact reverse spatial distributions of DOC between the wet and dry seasons (which increased with the flow direction in the wet season) were due to different precipitation rates, and the rare rainfall in the dry season had difficulty flushing the soil and transporting soil organic matter into the rivers. The local government should control sewage discharge and optimize farming methods.

ACS Style

Jinke Liu; Guilin Han; Xiaolong Liu; Man Liu; Chao Song; Kunhua Yang; Xiaoqiang Li; Qian Zhang. Distributive Characteristics of Riverine Nutrients in the Mun River, Northeast Thailand: Implications for Anthropogenic Inputs. Water 2019, 11, 954 .

AMA Style

Jinke Liu, Guilin Han, Xiaolong Liu, Man Liu, Chao Song, Kunhua Yang, Xiaoqiang Li, Qian Zhang. Distributive Characteristics of Riverine Nutrients in the Mun River, Northeast Thailand: Implications for Anthropogenic Inputs. Water. 2019; 11 (5):954.

Chicago/Turabian Style

Jinke Liu; Guilin Han; Xiaolong Liu; Man Liu; Chao Song; Kunhua Yang; Xiaoqiang Li; Qian Zhang. 2019. "Distributive Characteristics of Riverine Nutrients in the Mun River, Northeast Thailand: Implications for Anthropogenic Inputs." Water 11, no. 5: 954.

Journal article
Published: 10 April 2019 in Sustainability
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Soil carbon and nitrogen storage and stabilization are the key to solving the problems of mitigation of global warming and maintaining of crop productivity. In this study, the contents of soil organic carbon (SOC) and soil organic nitrogen (SON) and their stable isotope compositions (δ13CSOC and δ15NSON) in soil profiles were determined in two agricultural lands (including a farmland and an abandoned farmland) and four non-agricultural lands (including two shrub-grass lands and two shrub lands) in the karst critical zone observatory (CZO), Southwest China. The contents of SOC and SON were used for research on the effects of land use on SOC and SON storage, and the change of δ13CSOC and δ15NSON values in soil profiles were used to indicate SOC and SON stabilization. The results showed that agricultural activities reduced SOC and SON storage in the whole soil layers of farmland compared to non-agricultural lands, and farmland abandonment slightly increased SOC and SON storage. Crop rotation between peanut (C3) and corn (C4) affected the δ13CSOC in surface soils of agricultural lands (−21.6‰), which were intermediate between shrub lands (−22.7‰) and shrub-grass lands (−19.6‰). 15N-depleted SON in surface soils in farmland compared to those soil in other lands possibly associated with synthetic N fertilizer application. In soil layers below 30 cm depth the δ13CSOC deceased with depth, while the δ15NSON displayed irregular fluctuation. The change in δ13CSOC and δ15NSON through soil profiles in karst soils were more intensive than those in semiarid grassland soils indicating the less stabilization of SOC and SON in karst soils.

ACS Style

Man Liu; Guilin Han; Qian Zhang; Zhaoliang Song. Variations and Indications of δ13CSOC and δ15NSON in Soil Profiles in Karst Critical Zone Observatory (CZO), Southwest China. Sustainability 2019, 11, 2144 .

AMA Style

Man Liu, Guilin Han, Qian Zhang, Zhaoliang Song. Variations and Indications of δ13CSOC and δ15NSON in Soil Profiles in Karst Critical Zone Observatory (CZO), Southwest China. Sustainability. 2019; 11 (7):2144.

Chicago/Turabian Style

Man Liu; Guilin Han; Qian Zhang; Zhaoliang Song. 2019. "Variations and Indications of δ13CSOC and δ15NSON in Soil Profiles in Karst Critical Zone Observatory (CZO), Southwest China." Sustainability 11, no. 7: 2144.

Journal article
Published: 23 February 2019 in International Journal of Environmental Research and Public Health
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C and N species, including dissolved organic carbon (DOC), dissolved inorganic carbon (DIC), dissolved organic nitrogen (DON), NO3− and NH4+ contents in 57 river water samples collected from the Mun River of Thailand were measured to determine the relationships between these dissolved load species and their impacts on the environment. DOC values varied between 1.71 and 40.08 mg/L, averaging 11.14 mg/L; DON values ranged from 0.20 to 1.37 mg/L, with an average value of 0.48 mg/L; NO3−-N values averaged 0.18 mg/L; and NH4+-N values averaged 0.15 mg/L. DOC contents increased while DON and NO3− values decreased along the flow direction. The concentrations of NH4+ maintained the same level in the whole watershed. DOC and DON values exhibited clearly higher concentrations in comparison with other rivers worldwide and were inextricably linked with anthropogenic inputs. The relationships of DOC, DON, and anthropogenic ions imply that there are two different anthropogenic sources (industrial activities and agricultural activities) of the dissolved load in the Mun River watershed. The limited correlations between the DON, NO3−, and NH4+ indicate that the N species are not dominated by a single factor, and reciprocal transformations of riverine N pool are complex. Based on the environmental water quality standard reported by the EC (European Communities) and the World Health Organization, assessments of the water quality using the parameters of pH, dissolved oxygen (DO), NO3−, NH4+, and TN (total nitrogen) in the Mun River were conducted. The results demonstrate that the river water faces potential environmental pollution, and anthropogenic inputs endanger local water quality and the aquatic community. Therefore, the local government should restrict and reduce the anthropogenic inputs discharged in to rivers, and launch long-term monitoring of water quality.

ACS Style

Jinke Liu; Guilin Han; Xiaolong Liu; Man Liu; Chao Song; Qian Zhang; Kunhua Yang; Xiaoqiang Li. Impacts of Anthropogenic Changes on the Mun River Water: Insight from Spatio-Distributions and Relationship of C and N Species in Northeast Thailand. International Journal of Environmental Research and Public Health 2019, 16, 659 .

AMA Style

Jinke Liu, Guilin Han, Xiaolong Liu, Man Liu, Chao Song, Qian Zhang, Kunhua Yang, Xiaoqiang Li. Impacts of Anthropogenic Changes on the Mun River Water: Insight from Spatio-Distributions and Relationship of C and N Species in Northeast Thailand. International Journal of Environmental Research and Public Health. 2019; 16 (4):659.

Chicago/Turabian Style

Jinke Liu; Guilin Han; Xiaolong Liu; Man Liu; Chao Song; Qian Zhang; Kunhua Yang; Xiaoqiang Li. 2019. "Impacts of Anthropogenic Changes on the Mun River Water: Insight from Spatio-Distributions and Relationship of C and N Species in Northeast Thailand." International Journal of Environmental Research and Public Health 16, no. 4: 659.

Journal article
Published: 22 February 2019 in Water
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River water samples between August 2017 (wet season) and March 2018 (dry season) from the Mun River Basin in northeast Thailand were collected and their dissolved heavy metals concentrations (Al, Mn, Fe, Cu, Zn, and Ba) were measured. Compared with international drinking water guidelines, Mn was the dominant pollutant in the dry season. The correlation analysis (CA) suggested that similar sources were shown in each element pair of Al-Fe, Mn-Zn, and Fe-Ba in both seasons. The principal component analysis (PCA) results showed that the dominant source of dissolved heavy metals was sedimentary inputs or colloid destabilization in the wet season, while anthropogenic inputs were the main sources in the dry season, such as agricultural runoff, industrial effluents, and domestic discharge. On the basis of water quality index (WQI), water at most sites in the wet and dry seasons can be categorized as excellent water, except for a few sites with substandard values. The river water posed no significant health risks according to the health risk assessment, but Mn, Fe, and Ba needed to be paid more attention due to the relatively high values. Al, Fe, and Ba were the main dissolved heavy metals flowing into the Mekong River, and Cu contributed to the background value in the Mekong river.

ACS Style

Bin Liang; Guilin Han; Man Liu; Xiaoqiang Li; Chao Song; Qian Zhang; Kunhua Yang. Spatial and Temporal Variation of Dissolved Heavy Metals in the Mun River, Northeast Thailand. Water 2019, 11, 380 .

AMA Style

Bin Liang, Guilin Han, Man Liu, Xiaoqiang Li, Chao Song, Qian Zhang, Kunhua Yang. Spatial and Temporal Variation of Dissolved Heavy Metals in the Mun River, Northeast Thailand. Water. 2019; 11 (2):380.

Chicago/Turabian Style

Bin Liang; Guilin Han; Man Liu; Xiaoqiang Li; Chao Song; Qian Zhang; Kunhua Yang. 2019. "Spatial and Temporal Variation of Dissolved Heavy Metals in the Mun River, Northeast Thailand." Water 11, no. 2: 380.

Journal article
Published: 02 February 2019 in International Journal of Environmental Research and Public Health
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This study focuses on the chemical weathering process under the influence of human activities in the Jiulongjiang River basin, which is the most developed and heavily polluted area in southeast China. The average total dissolved solid (TDS) of the river water is 116.6 mg/L and total cation concentration ( TZ + ) is 1.5 meq/L. Calcium and HCO 3 − followed by Na + and SO 4 2 − constitute the main species in river waters. A mass balance based on cations calculation indicated that the silicate weathering (43.3%), carbonate weathering (30.7%), atmospheric (15.6%) and anthropogenic inputs (10.4%) are four reservoirs contributing to the dissolved load. Silicates (SCW) and carbonates (CCW) chemical weathering rates are calculated to be approximately 53.2 ton/km2/a and 15.0 ton/km2/a, respectively. When sulfuric and nitric acid from rainfall affected by human activities are involved in the weathering process, the actual atmospheric CO 2 consumption rates are estimated at 3.7 × 105 mol/km2/a for silicate weathering and 2.2 × 105 mol/km2/a for carbonate weathering. An overestimated carbon sink (17.4 Gg C / a ) is about 27.0% of the CO 2 consumption flux via silicate weathering in the Jiulongjiang River basin, this result shows the strong effects of anthropogenic factors on atmospheric CO 2 level and current and future climate change of earth.

ACS Style

Xiaoqiang Li; Guilin Han; Man Liu; Kunhua Yang; Jinke Liu. Hydro-Geochemistry of the River Water in the Jiulongjiang River Basin, Southeast China: Implications of Anthropogenic Inputs and Chemical Weathering. International Journal of Environmental Research and Public Health 2019, 16, 440 .

AMA Style

Xiaoqiang Li, Guilin Han, Man Liu, Kunhua Yang, Jinke Liu. Hydro-Geochemistry of the River Water in the Jiulongjiang River Basin, Southeast China: Implications of Anthropogenic Inputs and Chemical Weathering. International Journal of Environmental Research and Public Health. 2019; 16 (3):440.

Chicago/Turabian Style

Xiaoqiang Li; Guilin Han; Man Liu; Kunhua Yang; Jinke Liu. 2019. "Hydro-Geochemistry of the River Water in the Jiulongjiang River Basin, Southeast China: Implications of Anthropogenic Inputs and Chemical Weathering." International Journal of Environmental Research and Public Health 16, no. 3: 440.