This page has only limited features, please log in for full access.
Trace metal pollution is one of the most concerning issues in Yunnan province, where red soil is the dominant soil. To investigate the sources of trace metals and assess their pollution level and potential ecological and health risk, trace metal concentrations were measured in two red soil profiles (S1 and S2) from Yunnan province. Results show that Cr, As, and Zn are the most abundant trace metals in both soil profiles. However, As and Cr might be pollutants because their concentrations are higher than the local background values and the average concentrations in soils from other countries such as China, Japan, the UK, and the USA. Based on the correlation matrix and principal component analysis, As and Cr in red soils were affected by mining activities. Based on the single factor index and Nemero pollution index, the enrichment of As and Cr in Yunnan province can lead to light pollution in red soils. The RI values of trace metals exhibit a low ecological risk, of which the RI values of As and Cd in S1 are higher than those of Cr, Cu, Ni, Pb, and Zn in both profiles, implying a higher soil pollution level in south Yunnan. Furthermore, the HI results indicate that As can cause non‐carcinogenic risk on human health and should be paid more attention to. This study is aimed to help developing the ecological management of red soils and providing scientific evidence for preventing the hazardous contamination of trace metals in soils. This article is protected by copyright. All rights reserved
Bin Liang; Guilin Han; Jie Zeng; Rui Qu; Man Liu; Jinke Liu. Source and Risk Assessment of Trace Metals in Red Soils from Yunnan Province, Southwest China. CLEAN – Soil, Air, Water 2021, 2000288 .
AMA StyleBin Liang, Guilin Han, Jie Zeng, Rui Qu, Man Liu, Jinke Liu. Source and Risk Assessment of Trace Metals in Red Soils from Yunnan Province, Southwest China. CLEAN – Soil, Air, Water. 2021; ():2000288.
Chicago/Turabian StyleBin Liang; Guilin Han; Jie Zeng; Rui Qu; Man Liu; Jinke Liu. 2021. "Source and Risk Assessment of Trace Metals in Red Soils from Yunnan Province, Southwest China." CLEAN – Soil, Air, Water , no. : 2000288.
The Chinese project, better known as the Grain for Green Project (GGP), has changed the land-use type in the karst area of Puding county, Guizhou province, southwest China, and this study is aimed at evaluating the Hg distribution and determining factors in soils after the land-use change. A total of ten soil profiles were selected in the typical karst region, and the land-use types were divided into native vegetation land (NVL), farmland (FL), and abandoned farmland (AFL). Total Hg concentration under different land-use types increased in the order: NVL (average 63.26 μg∙kg−1) < FL (average 71.48 μg∙kg−1) < AFL (average 98.22 μg∙kg−1). After agricultural abandonment for four to five years with a cover of native vegetation in the AFL, a higher concentration of Hg compared to the other two land-use types indicate that the Hg accumulation in soil results from vegetation restoration of AFL due to land-use change. Soil organic carbon (SOC) and macro-aggregates were highly correlated to Hg concentration in this study. Macro-aggregates can provide a stable condition for Hg due to the thin regolith and high porosity in the karst region. A high proportion of macro-aggregates can reduce the mobility of Hg in the karst area. Intense tillage can significantly reduce the formation of macro-aggregates in FL, but the macro-aggregates in AFL were recovered as well as those in NVL, resulting in the accumulation of Hg.
Rui Qu; Guilin Han. The Grain for Green Project May Enrich the Mercury Concentration in a Small Karst Catchment, Southwest China. Land 2020, 9, 354 .
AMA StyleRui Qu, Guilin Han. The Grain for Green Project May Enrich the Mercury Concentration in a Small Karst Catchment, Southwest China. Land. 2020; 9 (10):354.
Chicago/Turabian StyleRui Qu; Guilin Han. 2020. "The Grain for Green Project May Enrich the Mercury Concentration in a Small Karst Catchment, Southwest China." Land 9, no. 10: 354.
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.
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 StyleWenxiang 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 StyleWenxiang 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.
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.
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 StyleBin 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 StyleBin 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.
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.
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 StyleRui 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 StyleRui 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.
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.
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 StyleKunhua 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 StyleKunhua 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.
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.
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 StyleJinke 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 StyleJinke 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.
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.
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 StyleRui 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 StyleRui 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.