Agricultural ditches and ponds potentially enhance nitrogen sink function of paddy system

文献类型： 外文期刊

第一作者： Liu, Lianhua

作者： Liu, Lianhua;Ouyang, Wei;Bai, Yan;Geng, Fang;Ouyang, Wei;Hao, Fanghua

作者机构：

关键词： Ditch and pond; Paddy field; Non-point source pollution; Nitrogen dynamics; Nitrogen sink function

期刊名称：PROCESS SAFETY AND ENVIRONMENTAL PROTECTION （ 影响因子：7.8； 五年影响因子：7.7 ）

ISSN： 0957-5820

年卷期： 2025 年 196 卷

页码：

收录情况： SCI

摘要： Agricultural ditches and ponds are important chain for water and nitrogen (N) cycle in paddy system, and deep understanding of their N component dynamics and buffering capacity are paramount importance to control N pollution. In this study, the high-frequency water quality monitoring of different surface water types (paddy field, ditch, and pond) was conducted in a typical paddy system. Dynamic characteristics of total N and its components of different surface water were analyzed, and the corresponding N export dynamics and N sink function of paddy system were identified. Results showed that ditches and ponds had remarkable N buffering capacities for paddy field draiange, with 36.23 %-50.35 % and 57.41 %-69.11 % N concentration reduction during the rice-growing season, respectively. N buffering capacity increased as the water flowed downstream during drainage events, with high N concentration fluctuation in the field ditch water and relative stability in the collector ditch and pond waters. High heterogeneities changes of N components in different rice-growing season were identified in different surface water types. Ammonium N (NH4+-N) and organic N (ON-N) was the dominant form in the regreening stage (44.09 %) and the remaining stages (43.50 %) in the field ponding water, respectively, whereas nitrate N (NO3--N) was the dominant form (50.87 %-64.23 %) in the collector ditch water and pond water. The comparison of N fluxes with water movement at different scales demonstrated that ditches and ponds enhanced N sink function of the paddy system, with approximately 50.38 % N runoff reduction of paddy field drainage. These findings revealed that fully utilizing the N sink and buffering capacity of agricultural ditches and ponds acted as a key strategy for water pollution control in paddy field watershed.

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