水土保持学报2018，Vol.32Issue(2)：276-282,7.DOI:10.13870/j.cnki.stbcxb.2018.02.041
基于旋耕玉米秸秆还田条件下土壤微生物、酶及速效养分的动态特征
Dynamic Characteristics of Soil Microorganisms, Enzymes and Available Nutrients Under the Conditions of the Corn Straw Returning Based on Rotary Tillage
摘要
Abstract
In order to understand the decomposing mechanism of the straw returning to field under rotary tillage,the different treatments based on amounts of straw returning were set up.Soil microbial biomass,soil enzymes activities and available nutrients contents were measured at maize jointing stage,male stage,middle maturity stage and mature stage respectively.The results showed that:(1) The straw returning could promote the soil microbial reproduction,increase the soil enzymes activities and the content of alkali hydrolyzable nitrogen,but decrease the contents of available phosphorus and available potassium.The number of fungi,bacteria,actinomycetes and sucrasc and cellulase activities increased substantially under the straw returning amount of 11 250 kg/hm2.Urease and phosphatase activities and the contents of alkali hydrolyzable nitrogen increased under 7 500 kg/hm2,but the available phosphorus and available potassium decreased.(2) There were positive correlations between the number of soil fungi,bacteria,actinomyces and cellulase activity,but the fungi quantity was negatively related to phosphatase activity after planting for 40 days.Actinomycetes quantity was positively related to phosphatase and sucrase after 60 days,and related to sucrase after 140 days.(3) There were correlations among the soil enzymes activities.Urease was positively related to cellulose,and phosphatase was positively correlated with sucrase in 67 days.Sucrase was positively related to cellulose,and urease was negatively related to sucrase and cellulose in 140 days.(4) There were correlations between the soil enzymes activities and the available nutrients contents.Urease in 40 days and 112 days,cellulase in 67 days,phosphatase in 112 and 140 days had positive correlations with alkali hydrolyzable nitrogen contents.关键词
玉米/旋耕/秸秆还田/土壤微生物/土壤酶/速效养分Key words
maize/rotary tillage/straw returning/soil microorganism/soil enzyme/available nutrients分类
农业科技引用本文复制引用
闫洪奎,于泽,王欣然,李春阳,赵丽,计默睿,王立为..基于旋耕玉米秸秆还田条件下土壤微生物、酶及速效养分的动态特征[J].水土保持学报,2018,32(2):276-282,7.基金项目
国家重点研发计划项目“辽宁春玉米粳稻密植抗逆丰产增效关键技术研究与示范”(2017YFD0300700) （2017YFD0300700）
