Shift of lakeshore cropland to buffer zones greatly reduced nitrogen loss from the soil profile caused by the interaction of lake water and shallow groundwater
文献类型： 外文期刊
作者： Cui, Rongyang 1 ; Zhang, Dan 1 ; Liu, Gangcai 2 ; Wang, Panlei 5 ; Chen, Anqiang 5 ; Wang, Hongyuan 6 ;
作者机构： 1.Yunnan Agr Univ, Coll Resources & Environm, Kunming 650201, Yunnan, Peoples R China
2.Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Surface Proc & Ecol Regulat, Chengdu 610041, Peoples R China
3.Chinese Acad Sci, Minist Water Conservancy, Chengdu 610041, Peoples R China
4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
5.Yunnan Acad Agr Sci, Agr Environm & Resources Inst, Kunming 650201, Yunnan, Peoples R China
6.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Key Lab Non Point Source Pollut Control, Minist Agr & Rural Affairs, Beijing 100081, Peoples R China
关键词： Soil nitrogen loss; Soil profile; Cropland buffer zone; Hyporheic zone
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 803 卷
页码：
收录情况： SCI
摘要： The interaction of lake water (LW) and shallow groundwater (SGW) accelerates nitrogen (N) loss from the soil profile in the lakeshore cropland, and cropland buffer zone (CBZ) significantly inhibits N loss in this area. Here, characteristics of N loss and transformations driven by SGW and LW interactions were explored using microcosmic experiments, and N loss was estimated using in situ monitoring data before and after the construction of the CBZ along the west bank of Erhai Lake. The results indicated that NO3--N, dissolved organic N and total dissolved N sustained the main N losses in the soil, and the organic N was responsible for the main N loss in the effluent. The lower total nitrogen (TN) concentrations of SGW in this area, the greater the soil N loss. Moreover, N total loss from the 100 cm soil profile in the control check was 1.8 times that in the simulated SGW treatment. We found that nitrification, denitrification and anammox driven by the microbial community and N functional genes were the key processes leading to N loss. The effluent N (3.64%) and gaseous N (0.32%) loss ratios in the cropland for continuously growing vegetables (CGV) were much higher than that in the CBZ (1.07% of effluent N and 0.25% of gaseous N loss ratios). If a 100 m wide and 48 km long area of lakeshore cropland is CGV, an increase by 47% is projected by 2030 compared with the N loss in 2020. But this region was built as a 100 m wide CBZ or 50 m wide CBZ + 50 m wide CGV after 2019, N loss will be reduced by 87% and 44% in 2030 compared with the N loss in CGV. The results implied that restoring a suitable width of CBZ can significantly reduce N loss. (c) 2021 Elsevier B.V. All rights reserved.
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