Dynamics of Spatiotemporal Variation of Groundwater Arsenic Due to Salt-Leaching Irrigation and Saline-Alkali Land
Dynamics of Spatiotemporal Variation of Groundwater Arsenic Due to Salt-Leaching Irrigation and Saline-Alkali Land
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DOI：
10.3390/rs14215586
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发表时间：
2022-11
期刊：
影响因子：
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通讯作者：
Shuhui Yin;Yuan Tian-;Linsheng Yang;Qiqian Wen;Binggan Wei
中科院分区：
文献类型：
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作者：
Shuhui Yin;Yuan Tian-;Linsheng Yang;Qiqian Wen;Binggan Wei
确定淋盐灌溉、盐碱地和地下水砷(As)的演变之间的联系，对于预防地下水砷污染和实施适当的土壤盐碱化控制项目至关重要。本研究以河套平原为例，探讨盐碱地和淋盐灌溉与地下水的时空相关性。因此，通过历史数据和化学测量收集了第一阶段(2006-2010年)和第二阶段(2016-2020年)的地下水浓度。利用遥感数据提取了一、二期盐渍灌区和盐碱地面积。随着淋盐灌区水位(SLIAL)和盐碱地面积水位(SAAL)的增加，地下水As浓度的变化趋势略有波动，但在低盐度时SLIAL有所增加，这可能是因为短期淹水可能不会显著增强AS的动员作用。地下水As浓度较低出现在SLIAL较高和Salal较低的地区。盐碱地面积越大(盐碱度越高)，地下水As浓度越高。通径分析模型证实，淋盐灌溉可能会增加地下水盐度，影响地下水As水平，减少盐碱地面积。从第I期到第II期，通径分析结果的差异可能表明，盐碱地面积的减少可能影响了地下水中总溶解固体(TDS)的增加而导致的竞争吸附。我们的结果为盐碱地和淋盐灌溉对干旱和半干旱地区地下水As浓度的影响以及As的地球化学过程提供了新的见解。
Determining the link between the evolution of salt-leaching irrigation, saline-alkali land, and groundwater arsenic (As) is essential to prevent groundwater arsenic pollution and implement appropriate soil salinization control projects. The objectives of our study were to explore the spatiotemporal correlation of saline-alkali land and salt-leaching irrigation with groundwater As in the Hetao Plain. Therefore, groundwater As concentrations during Period I (2006–2010) and Period II (2016–2020) were collected by historical data and chemical measurements. Salt-leaching irrigation area and saline-alkali land area in Period I and Period II were extracted through remote sensing data. With the increase of the salt-leaching irrigation area level (SLIAL) and saline-alkali land area level (SALAL), the variation trend in groundwater As concentration slightly fluctuated, with an increase in the SLIAL at the low SALAL, which may be because short-term flooding may not considerably enhance As mobilization. Lower groundwater As concentrations appeared in regions with higher SLIAL and lower SALAL. A larger saline-alkali land area (higher SALAL) increased the groundwater As concentration. The path analysis model confirmed that salt-leaching irrigation may increase groundwater salinity to affect groundwater As levels and to decrease the saline-alkali land area. From Periods I to II, the difference in path analysis results may imply that the decrease in the saline-alkali land area may have influenced As mobilization due to competitive adsorption caused by the increase in total dissolved solids (TDS) in groundwater. Our results provide new insights for the impacts of saline-alkali land and salt-leaching irrigation both on groundwater As concentration and the geochemical processes of As enrichment in arid and semi-arid areas with more serious salinization.