数字农科院2.0

Minimizing the potential risk of soil nitrogen loss through optimal fertilization practices in intensive agroecosystems

文献类型： 外文期刊

作者： Wang, Jun;Zhang, Lu;Liu, Kailou;Zhou, Boku;Gao, Hongjun;Han, Xiaori;Liu, Shutang;Huang, Shaomin;Zhang, Aijun;Hua, Keke;Wang, Jidong;Hu, Hangwei;Xu, Minggang;Zhang, Wenju

作者机构：

关键词： Gross nitrification;Gross N immobilization;Manure;Chemical fertilizer;Microbial abundance

期刊名称： AGRONOMY FOR SUSTAINABLE DEVELOPMENT

ISSN： 1774-0746

年卷期： 2025 年 45 卷 1 期

页码：

收录情况： SCIE（2025版）

摘要： Nitrification and nitrogen (N) immobilization are important pathways in soil N transformations, involving soil N loss and retention, respectively. The ratio of nitrification to N immobilization generally reflects the potential risk of soil N loss. However, little is known about the response of this ratio to anthropogenic carbon (C) and N inputs, but also climate and soil conditions. Here, we aimed to elucidate, for the first time, the impacts of chemical fertilizer and manure application on the ratio of gross nitrification to N immobilization by using 15N dilution technology, based on ten long-term fertilization trials spanning multiple climatic zones in eastern China. Results showed that manure application differentially increased gross N immobilization rather than nitrification compared to the chemical fertilizer treatment, leading to manure-induced decreases in gross nitrification to N immobilization ratio ranging from 1.2 to 93% across the sites. The decreased gross nitrification to N immobilization ratio in the manure treatment was mainly due to the increased ratio of bacteria to nitrifiers abundance. Manuring was more effective for a decrease in the gross nitrification to N immobilization ratio at sites characterized by high rainfall and low soil pH, as it prevented soil pH decline thereby favoring bacterial abundance and N immobilization. Consequently, manure application resulted in a substantial increase in soil total N accumulation, facilitated by increased microbial N immobilization that promoted microbial biomass. These findings suggest that substituting manure for chemical fertilizer in the areas with high rainfall and acidic soils promisingly reduces soil N loss risk, with positive consequences for soil N retention. This knowledge highlights the potential to reconcile soil N loss and fertility improvement through optimizing regional manure management, which offers valuable insights for the development of a tailored regional fertilization management strategy.

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