土壤2025，Vol.57Issue(2)：469-476,8.DOI:10.13758/j.cnki.tr.2025.02.026
长期覆膜秸秆还田对土壤氮库和氮饱和亏缺的影响
Effects of Long-term Film Mulching with Straw Return on Soil Nitrogen Pool and Nitrogen Saturation Deficit
摘要
Abstract
Based on a 7-year spring maize field experiment on the Loess Plateau,in which two treatments of urea mixed controlled release fertilizer under film mulching(the control,Cu)and CU+straw return(CS)were established to investigate the effects of long-term film mulching with straw return on nitrogen(N)pools and N saturation deficits of topsoil(0-20 cm)and subsoil(20-40 and 40-60 cm).The results showed that compared with the control,CS decreased bulk density of topsoil,increased total nitrogen content and total nitrogen storage in each soil layer,significantly increased topsoil N pool management indexes in 2019 and 2020,and significantly increased topsoil nitrate N by 173%and 176%in 2019 and 2020,respectively,but decreased topsoil ammonium N,Compared with the control,CS increased the contents of water soluble organic N,hot water extracted organic N and particulate organic N to varying degrees and slightly increased mineral-associated organic N content in topsoil,and significantly increased current N pool in fine particles and significantly decreased N saturated deficit in topsoil in both years.In conclusion,film mulching with straw return is a sustainable management measure for improving soil quality and enhancing soil N pools in dryland agricultural areas.关键词
覆膜秸秆还田/无机氮组分/有机氮组分/氮库管理指数/氮饱和亏缺Key words
Film mulching with straw return/Inorganic nitrogen fractions/Organic nitrogen fractions/Nitrogen pool management index/Nitrogen saturation deficit分类
农业科技引用本文复制引用
张方方,薄其飞,吴孔阳,白炬,高娜,岳善超,李世清..长期覆膜秸秆还田对土壤氮库和氮饱和亏缺的影响[J].土壤,2025,57(2):469-476,8.基金项目
陕西省重点研发计划项目(2023-ZDLNY-52)、国家重点研发计划项目(2021YFD1900700)和河南省科技攻关计划项目(242102320148)资助. （2023-ZDLNY-52）
