不同施氮量下玉米秸秆还田对土壤有机碳及其组分的影响  

Effects of Application of Different Nitrogen Levels on the Soil Organic Carbon Composition of Returning Straw

作　　者：张玉娇[1,2] 邱慧珍 郭亚军[1,2] 张建斌 Zhang Yujiao;Qiu Huizhen;Guo Yajun;Zhang Jianbin(College of Resources and Environmental Science·Gansu Provincial Key Lab of Arid Land Crop Science,Gansu Agriculture University,Gansu Lanzhou 730070,China;Engineering Research Center for the Resource Utilization of Livestock and Poultry Wastes in Gansu Province,Gansu Lanzhou 730070,China)

机构地区：[1]甘肃农业大学资源与环境学院甘肃省干旱生境作物学重点实验室,甘肃兰州730070 [2]甘肃省畜禽废弃物资源化利用工程研究中心,甘肃兰州730070

出　　处：《国土与自然资源研究》2022年第2期87-90,共4页Territory & Natural Resources Study

基　　金：国家重点研发计划项目(2017YFD0800200);国家自然科学基金(31360500);国家重点基础研究发展计划(973计划)(2015CB150501)资助。

摘　　要：为揭示基于不同施氮量的玉米秸秆还田对土壤有机碳组分的影响,通过田间定位试验,设置N0、S+N0、S+N75、S+N225、S+N375五个处理,以秸秆不还田不配施氮肥(N0)为对照,研究不同施氮量的玉米秸秆还田对土壤有机碳及其活性碳组分的影响。试验结果表明,不同施氮量的玉米秸秆还田处理土壤总有机碳(TOC)、土壤溶解性有机碳(DOC)和土壤微生物生物量碳(MBC)的含量均高于秸秆不还田处理,同时,施氮量过多时,土壤微生物生物量碳含量降低。因此,秸秆还田配施适量氮肥可以提高土壤有机碳的含量。In order to reveal the effects of corn straw returning to the field based on different nitrogen application rates on soil organic carbon components, five treatments, N0, S +N0, S +N75,S +N225 and S +N375, were set up through field experiment, and the effects of corn straw returning to the field with different nitrogen application rates on soil organic carbon and its activated carbon components were studied with no nitrogen application rate(N0) as control. The results showed that the contents of soil total organic carbon(TOC), soil dissolved organic carbon(DOC) and soil microbial biomass carbon(MBC) in maize straw returning treatment with different nitrogen application rates were higher than those in non returning treatment, and the content of soil microbial biomass carbon decreased with excessive nitrogen application.Therefore, straw returning combined with appropriate amount of nitrogen fertilizer can improve the content of soil organic carbon.

关 键 词：秸秆还田 不同施氮量 溶解性有机碳 微生物生物量碳 

分 类 号：S152.4[农业科学—土壤学]