不同促腐条件下秸秆还田对土壤微生物量碳氮磷动态变化的影响  

Effects of returning maize straw into field on dynamic change of soil microbial biomass C,N and P under different promoted decay condition

作　　者：张电学[1] 韩志卿[1] 李东坡[2,3] 刘微[1] 高书国[1] 侯东军[1] 常连生[1] 

机构地区：[1]河北科技师范学院农学系 [2]中国科学院沈阳应用生态研究所,沈阳110016 [3]3沈阳农业大学土地与环境学院,沈阳110161

出　　处：《应用生态学报》2005年第10期1903-1908,共6页Chinese Journal of Applied Ecology

基　　金：国家重点基础研究发展规划项目(199901180804);中国科学院沈阳应用生态研究所知识创新工程重大项目(SCXZD010402);河北省教育厅资助项目(990208).

摘　　要：通过2年田间定位试验,研究了冀东地区小麦玉米轮作制度下,不同促腐条件下玉米秸秆配施化肥直接还田对土壤微生物量C、N、P动态变化的影响,并讨论了其与土壤养分和酶活性的关系.结果表明,秸秆配施化肥并调节其C/N条件下,施用促腐剂处理作物各生育期土壤微生物量C、N、P均表现出高于未施用处理的趋势,并使微生物量N、P达到高峰期的时间提前,对土壤养分调控效果较好.土壤微生物量C、N、P与土壤酶活性在作物各生育期均表现为显著和极显著正相关关系,但与土壤碱解氮、有效磷的相关性受到施肥制度和作物生长的强烈影响.A 2-year field experiment of wheat-maize rotation was conducted on a cinnamon soil of east Hebei Province to study the effects of returning maize straw into field on the dynamics of soil microbial biomass C, N and P, and their relationships with soil nutrients and enzyme activities. The results showed that under the condition of returning maize straw combined with applying chemical fertilizer to adjust straw C/N, the application of effective microorganisms could increase soil microbial biomass C, N and P in each crop growth period, advance their peak time, and better regulate soil nutrient supply, compared with no application of effective microorganisms. Soil microbial biomass had a significantly positive correlation with soil enzyme activities, but its correlation with soil hydrolysable N and available P was strongly affected by crop growth and fertilization system.

关 键 词：褐土 秸秆还田 促腐条件 微生物量 动态变化 

分 类 号：S154.3[农业科学—土壤学]