Drought–flood abrupt alternation events increase soil nitrogen loss via surface runoff in a typical grain base in China

IF 5 2区地球科学 Q1 WATER RESOURCES

Journal of Hydrology-Regional Studies Pub Date : 2025-06-19 DOI:10.1016/j.ejrh.2025.102543

Wuxia Bi , Yong Hu , Baisha Weng , Dawei Zhang , Fan Wang , Wenqing Lin , Weiqi Wang , Guoqiang Dong , Denghua Yan

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引用次数: 0

Abstract

Study region

Northern Anhui Plain, China.

Study focus

This study analyzed the nitrogen (N) mitigation (N storage in soil, plants, and surface runoff) under drought–flood abrupt alternation (DFAA) in summer maize farmland systems based on field experiments. Soil N loss due to DFAA in the summer maize planting area of the Northern Anhui Plain was simulated based on the critical threshold obtained from the field experiments.

New hydrological insights for the region

The experimental results showed that DFAA events reduced soil N storage and plant N storage by 14.9 % and 54.1 % compared to the control systems, respectively, while N storage in the water component of surface runoff in the DFAA treatments was 54.1 % higher. Numerical simulations revealed that the proportions of average annual soil N loss in topsoil were 14.98–19.58 % from 1964 to 2017 and 10.22–22.75 % from 2020 to 2050 in the study area. The highest average annual soil N loss shifted from the southwestern to the central and southeastern Northern Anhui Plain. The highest soil N loss in the hypothetical natural scenario was 49.0 % and 46.7 % lower compared to historical and future scenarios, respectively. The findings indicate that DFAA has significantly negative impacts on water quality. The quantitative analysis provides a reference for developing targeted regulation measures for the Northern Anhui Plain facing compound extreme events.

查看原文本刊更多论文

旱涝突变事件增加了中国典型粮食基地地表径流对土壤氮素的损失

研究区域：安徽平原北部。本研究在田间试验的基础上，分析了旱涝突变（DFAA）条件下夏玉米农田系统的氮素缓解（土壤、植物和地表径流中的氮素储量）。利用田间试验获得的临界阈值，对皖北平原夏玉米种植区DFAA造成的土壤氮流失进行了模拟。试验结果表明，与对照系统相比，DFAA事件使土壤氮储量和植物氮储量分别减少了14.9 %和54.1 %，而DFAA处理的地表径流水组分中的氮储量增加了54.1 %。数值模拟结果表明，1964 - 2017年研究区表层土壤N年均损失率为14.98 ~ 19.58 %，2020 - 2050年研究区表层土壤N年均损失率为10.22 ~ 22.75 %。年平均土壤氮流失最高区由皖北平原西南部向中部和东南部转移。与历史情景和未来情景相比，假设自然情景的最高土壤氮损失量分别降低49.0 %和46.7 %。结果表明，DFAA对水质有显著的负向影响。定量分析可为皖北平原面临复合极端事件制定针对性调控措施提供参考。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Hydrology-Regional Studies Earth and Planetary Sciences-Earth and Planetary Sciences (miscellaneous)

CiteScore

6.70

自引率

8.50%

发文量

284

审稿时长

60 days

期刊介绍： Journal of Hydrology: Regional Studies publishes original research papers enhancing the science of hydrology and aiming at region-specific problems, past and future conditions, analysis, review and solutions. The journal particularly welcomes research papers that deliver new insights into region-specific hydrological processes and responses to changing conditions, as well as contributions that incorporate interdisciplinarity and translational science.