Patterns of crop-specific fertilizer-nitrogen losses and opportunities for sustainable mitigation:A quantitative overview of 15N-tracing studies

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外文摘要：·Pattern and mitigation potential of crop-specific fertilizer-N losses were assessed.·China showed high fertilizer-N losses due to high N application rates and low SOC.·MAP,SOC,and soil pH are key parameters affecting fertilizer-N losses.·At a given application rate,soils with higher SOC have lower fertilizer-N losses.·Optimal N rate combined with SOC improvement could cut 34.8％-59.6％of N losses.Understanding crop-specific fertilizer-nitrogen(N)loss patterns,driving factors,and mitigation potentials is vital for developing efficient mitiga-tion strategies.However,analyses based on the gross magnitude of fertilizer-N losses within a growing season remain fragmented and inconclusive at a global scale.To address this gap,we conducted a global meta-analysis using 940 observations from 79 published 15N-tracing studies to assess the effects of natural factors,soil parameters,and N application rates on gross fertilizer-N losses in cereal-cropped soils.We found that China had the highest conventional fertilizer-N application and loss rates(230-255 and 75.9-114 kg N ha-1 season-1,respectively)and the lowest soil organic carbon(SOC)contents(10.6 g kg-1)among the countries examined.Mean annual precipitation,SOC content,and soil pH were key parameters affecting fertilizer-N losses in wheat-,maize-,and rice-cropped soils,respectively.Fertilizer-N application rates were positively correlated with N loss amounts,while higher SOC levels led to lower losses.Adopting optimized N application rates combined with improving SOC levels could potentially mitigate 34.8％-59.6％of N losses without compromising crop yields compared with conventional prac-tices.This study underscores the critical role of SOC in reducing N losses and suggests that future research should focus on innovative strategies and efficient organic amendments for enhanced SOC sequestration.

外文关键词：

fertilizer-nitrogen losscrop-specific15N tracingsoil organic carbonmeta-analysis

作者：

Cong Xu、Hanshen Zhu、Haokuang Liu、Cheng Ji、Jie Yuan、Guanlin Li、Jidong Wang、Yongchun Zhang

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作者单位：

National Agricultural Experimental Station for Agricultural Environment,Luhe,Institute of Agricultural Resources and Environment,Jiangsu Academy of Agricultural Sciences,Nanjing 210014,China

School of the Environment and Safety Engineering,Jiangsu University,Zhenjiang 212013,China

基金：

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaBasic Research Program of Jiangsu ProvinceJiangsu Agriculture Science and Technology Innovation FundKey Research and Development Project of Jiangsu ProvinceChina Agriculture Research System

项目编号：

419070694200708842377338BK20230076CX231019BE2021378CARS-10-Sweetpotato

出版年：

2024

DOI：

10.1007/s42832-023-0206-2

土壤生态学快报(英文)

ISSN：

年,卷(期)：2024.6(2)