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Siyi Zhang
National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China, Guangzhou 510650, China

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Journal article
Published: 20 October 2020 in Remote Sensing
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More than 1100 lakes covering an area greater than 4500 km2 are located on the Tibetan Plateau, and these lakes are important regulators of several large and famous rivers in Asia. The determination of hydrological changes that have occurred in these lakes can reflect climate change and supply scientific data to plateau environmental research. Data from high frequency (moderate-resolution imaging spectro-radiometer) MODIS images, altimetry, and the Hydroweb database collected during 2000–2015 were integrated in this study to delineate the detailed hydrological changes of 15 lakes in three basins—Inner Basin, Indus Basin, and Brahmaputra Basin—on the southern Tibetan Plateau. Seven of the 10 lakes in the Inner Basin presented increasing trends with various intensities, and the increasing rates in the area of four lakes (Nam Co, Selin Co, Zhari-namco, and Ngangze) were 1.62, 28.81, 2.27, and 3.70 km2/yr, respectively. The yearly increases in volume of the four lakes were 3.6, 9.44, 6, and 2.36 km3, respectively. A water balance equation was established for the four lakes based on lake volume changes to illustrate the contributions of precipitation, ground runoff, evaporation, and other factors. The results revealed that surface runoff was the major contributor to expansion, and lake surface evaporation was almost 2.76–3.86 times that of lake surface precipitation. The two lakes in Indus Basin, Rakshastal and Mapam Yumco, presented a slight retreat. As a representative of Brahmaputra Basin, Yamzho Yumco underwent a retreat of –3.49 km2/yr in area, –0.39 m/yr in level, and –0.19 km3/yr in volume. Decreasing precipitation, increasing evaporation, and the operation of a hydrological project were the main causes of its constant retreat.

ACS Style

Fangdi Sun; Ronghua Ma; Bin He; Xiaoli Zhao; Yuchao Zeng; Siyi Zhang; Shilin Tang. Changing Patterns of Lakes on The Southern Tibetan Plateau Based on Multi-Source Satellite Data. Remote Sensing 2020, 12, 3450 .

AMA Style

Fangdi Sun, Ronghua Ma, Bin He, Xiaoli Zhao, Yuchao Zeng, Siyi Zhang, Shilin Tang. Changing Patterns of Lakes on The Southern Tibetan Plateau Based on Multi-Source Satellite Data. Remote Sensing. 2020; 12 (20):3450.

Chicago/Turabian Style

Fangdi Sun; Ronghua Ma; Bin He; Xiaoli Zhao; Yuchao Zeng; Siyi Zhang; Shilin Tang. 2020. "Changing Patterns of Lakes on The Southern Tibetan Plateau Based on Multi-Source Satellite Data." Remote Sensing 12, no. 20: 3450.

Journal article
Published: 27 January 2020 in Environmental Pollution
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This three-decade long study was conducted in the Pearl River Delta (PRD), a rapidly urbanizing region in southern China. Extensive soil samples for a diverse land uses were collected in 1989 (113), 2005 (1384), 2009 (521), and 2018 (421) for heavy metals of As, Cr, Cd, Cu, Hg, Ni, Pb and Zn. Multiple pollution indices and Structural Equation Models (SEMs) were used in attribution analysis and comprehensive assessments. Data showed that majority of the sampling sites was contaminated by one or more heavy metals, but pollutant concentrations had not reached levels of concerns for food security or human health. There was an increasing trend in heavy metal contamination over time and the variations of soil contamination were site-, time- and pollutant-dependent. Areas with high concentrations of heavy metals overlapped with highly industrialized and populated areas in western part of the study region. A dozen SEMs path analyses were used to compare the relative influences of key environmental factors on soil contamination across space and time. The high or elevated soil contaminations by As, Cr, Ni, Cu and Zn were primarily affected by soil properties during the study period, except 1989–2005, followed by land use patterns. Parent materials had a significant effect on elevated soil contamination of Cd, Cr, Ni, Pb and overall soil pollution during 1989–2005. We hypothesized that other factors not considered in the present study, such as atmospheric deposition, sewage irrigation, and agrochemical uses, may be also important to explain the variability of soil contamination. This study implied that strategies to improve soil physiochemical properties and optimize landscape structures are viable methods to mitigate soil contamination. Future studies should monitor pollutant sources identified by this study to fully understand the causes of heavy metal contamination in rapidly industrialized regions in southern China.

ACS Style

Cheng Li; Georgina M. Sanchez; Zhifeng Wu; Jiong Cheng; Siyi Zhang; Qi Wang; Fangbai Li; Ge Sun; Ross K. Meentemeyer. Spatiotemporal patterns and drivers of soil contamination with heavy metals during an intensive urbanization period (1989–2018) in southern China. Environmental Pollution 2020, 260, 114075 .

AMA Style

Cheng Li, Georgina M. Sanchez, Zhifeng Wu, Jiong Cheng, Siyi Zhang, Qi Wang, Fangbai Li, Ge Sun, Ross K. Meentemeyer. Spatiotemporal patterns and drivers of soil contamination with heavy metals during an intensive urbanization period (1989–2018) in southern China. Environmental Pollution. 2020; 260 ():114075.

Chicago/Turabian Style

Cheng Li; Georgina M. Sanchez; Zhifeng Wu; Jiong Cheng; Siyi Zhang; Qi Wang; Fangbai Li; Ge Sun; Ross K. Meentemeyer. 2020. "Spatiotemporal patterns and drivers of soil contamination with heavy metals during an intensive urbanization period (1989–2018) in southern China." Environmental Pollution 260, no. : 114075.

Journal article
Published: 07 August 2019 in Water
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The maintenance of a soil’s infiltration rate (IR) and field-saturated hydraulic conductivity (Kfs) is crucial for the long-term sustainable functioning of wastewater-irrigated lands. However, an effective procedure for reliably measuring in situ soil Kfs remains elusive. To address this issue, this study investigated the dualhead infiltrometer (DHI), a novel instrument for automatically determining IR and Kfs, and compared it with a traditional double-ring infiltrometer (DRI) under various field conditions. In the initial phase, we optimized the procedure and settings for the DHIs in a cropland that was spray-irrigated with secondary-treated wastewater for decades in central Pennsylvania. Results showed that our optimized procedure, which used a single, long pressure cycle, yielded more robust measurements of IR than the originally recommended sequence of two short pressure cycles. The values of Kfs measured by the DHIs with optimized settings were similar to those measured by DRIs under many (but not all) field conditions, due to their differences in infiltration surface areas, operational procedures, length of infiltration time, and soil spatiotemporal variability. Viscosity-corrected Kfs on the irrigated cropland was 123.8 ± 94.0 mm∙h−1, higher than that on the adjacent non-irrigated cropland (103.2 ± 94.6 mm∙h−1), but the difference was not statistically significant, owing to the high degree of soil spatiotemporal variability and our limited number of measurements. Nevertheless, the higher Kfs values measured on irrigated cropland reflect observed changes in soil structure (e.g., soil pore characteristics) that resulted from decades of irrigation. Seasonal variations in Kfs values existed between winter and summer conditions, but IRs during all seasons remained much higher than the current spray-irrigation rate (4.25 mm∙h−1), suggesting that the soil is still capable of handling the routine irrigation, even during winter. However, the coefficients of variation exceeded 67.0% across the field sites investigated, and the time periods covered by our measurements were limited. As this specific site is permitted to discharge treated wastewater year-round, caution must still be exercised to ensure that soil Kfs remains high enough to prevent runoff generation, especially during winter frozen conditions.

ACS Style

Si-Yi Zhang; Isaac Hopkins; Li Guo; Henry Lin; Guo; Lin. Dynamics of Infiltration Rate and Field-Saturated Soil Hydraulic Conductivity in a Wastewater-Irrigated Cropland. Water 2019, 11, 1632 .

AMA Style

Si-Yi Zhang, Isaac Hopkins, Li Guo, Henry Lin, Guo, Lin. Dynamics of Infiltration Rate and Field-Saturated Soil Hydraulic Conductivity in a Wastewater-Irrigated Cropland. Water. 2019; 11 (8):1632.

Chicago/Turabian Style

Si-Yi Zhang; Isaac Hopkins; Li Guo; Henry Lin; Guo; Lin. 2019. "Dynamics of Infiltration Rate and Field-Saturated Soil Hydraulic Conductivity in a Wastewater-Irrigated Cropland." Water 11, no. 8: 1632.

Research article
Published: 07 August 2018 in Ecohydrology
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ACS Style

Si-Yi Zhang; Xiao-Yan Li; Zhi-Yun Jiang; Ding-Qiang Li; Henry Lin. Modelling of rainfall partitioning by a deciduous shrub using a variable parameters Gash model. Ecohydrology 2018, 11, e2011 .

AMA Style

Si-Yi Zhang, Xiao-Yan Li, Zhi-Yun Jiang, Ding-Qiang Li, Henry Lin. Modelling of rainfall partitioning by a deciduous shrub using a variable parameters Gash model. Ecohydrology. 2018; 11 (7):e2011.

Chicago/Turabian Style

Si-Yi Zhang; Xiao-Yan Li; Zhi-Yun Jiang; Ding-Qiang Li; Henry Lin. 2018. "Modelling of rainfall partitioning by a deciduous shrub using a variable parameters Gash model." Ecohydrology 11, no. 7: e2011.