Shallow groundwater fluctuation: An ignored soil N loss pathway from cropland

文献类型： 外文期刊

第一作者： Chen, Anqiang

作者： Chen, Anqiang;Guo, Shufang;Wang, Panlei;Zhang, Dan;Wang, Hongyuan;Khoshnevisan, Benyamin;Liu, Hongbin;Cui, Rongyang;Cui, Rongyang;Khoshnevisan, Benyamin

作者机构：

关键词： Soil nitrogen loss; Soil nitrogen storage; Fluctuations of shallow groundwater table; Soil profile; Cropland

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：10.753； 五年影响因子：10.237 ）

ISSN： 0048-9697

年卷期： 2022 年 828 卷

页码：

收录情况： SCI

摘要： Nitrogen (N) pollution originating from agricultural land is among the major threats to shallow groundwater (SG). Soil N lasses due to the SG table fluctuation are neglected, although a large number of studies have been conducted to evaluate N losses through leaching and runoff. Herein, the characteristics of N losses driven by SG table fluctuation were investigated using the microcosm experiment and surveyed data from the croplands around Erhai Lake. According to the results achieved, the total N (TN) loss mainly occurred during the initial 12 days when the soil was flooded, then presented N immobilized by soil and finally, basically balanced between influent and effluent after 50 days. The results demonstrated that 1.7% of the original soil TN storage (0-100 cm) was lost. The alternation of drying and flooding could greatly increase TN loss up to 1086 kg hm(-2), which was 2.72 times as much as that of continuous flooding flow. 'Elie amount of soil N losses to groundwater was closely related to the soil profile biochemical characteristics (water content, soil microbial immobilization, mineralization, nitrification, and denitrification processes). Soil N loss from crop fields driven by SG table fluctuation is 26 and 6 times of the runoff and leaching losses, respectively, while the soil N loss from the vegetable fields is 33 and 4 times of the runoff and leaching losses. The total amount of N losses from the croplands around the Erhai Lake caused by flooding of shallow groundwater (SG) in 2016 was estimated at 3506 Mg. The estimations showed that N losses would decrease by 16% if vegetables are replaced with staple food crops. These results imply that the adjustment of the planting structure was the key measure to reduce soil N storage and mitigate groundwater contamination.

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