土壤2023，Vol.55Issue(6)：1223-1229,7.DOI:10.13758/j.cnki.tr.2023.06.008
秸秆还田与氮肥运筹对农田棕壤微生物生物量碳氮及酶活性的调控效应
Regulation Effects of Straw Returning and Nitrogen Application Management on Farmland Brown Soil Microbial Biomass and Enzyme Activities
摘要
Abstract
How to effectively manage straw returning and nitrogen(N)application in order to develop the straw-returning technology with efficient N saving is an urgent problem to be solved in agriculture production of Northeast China.With a field positioning experiment,the effects of different straw returning methods(no returning;crushed-returning and ploughing,S;decomposed-returning and rotary tillage,DS)and N application rates(N 180,210 and 240 kg/hm2)on soil microbial biomass carbon/nitrogen(MBC/MBN)and the key enzyme activities of N metabolism were investigated.The results showed that compared with no returning,soil MBC and MBN contents,MBC/MBN ratio and urease activity in all S and DS treatments increased significantly,but nitrate reductase activity changed irregularly.With the extension of maize growth period,soil MBC and MBN contents for S and DN treatments showed single peak curve and double peak curve respectively,and urease and nitrate reductase activities both changed with a fluctuating trend,and both reached peak points at spring maize exuberant growing period(jointing stage to filling stage).With increase of N application rate,both soil MBC and MBN contents for all S and DS treatments increased,MBC/MBN ratio decreased,and the changes of urease and nitrate reductase activities differed from returning methods.Under the condition of the same N application rate,S treatment with a 15%postponing of N fertilizer could increase soil MBC and MBN contents,and decrease MBC/MBN ratio.In conclusion,the technology of crushed returning ploughing with N 210 kg/hm2 and a 15%postponing of N fertilizer has the potential to improve N management and enhance soil fertility in the agricultural producing areas of Northeast China.关键词
秸秆还田/氮肥运筹/微生物生物量碳氮/脲酶/硝酸还原酶Key words
Straw returning/Nitrogen application/Microbial biomass carbon and nitrogen/Urease/Nitrate reductase分类
农业科技引用本文复制引用
隽英华,何志刚,刘慧屿,刘艳,陈玥..秸秆还田与氮肥运筹对农田棕壤微生物生物量碳氮及酶活性的调控效应[J].土壤,2023,55(6):1223-1229,7.基金项目
沈阳市科技计划项目(21-109-3-01)资助. （21-109-3-01）
