土壤微生物量和土壤呼吸对降雨的响应  

Responses of soil microbial biomass and soil respiration to rainfall

作　　者：苏慧敏[1,2] 李叙勇[1] 欧阳扬[1] 

机构地区：[1]中国科学院生态环境研究中心,城市与区域生态国家重点实验室,北京100085 [2]西南大学资源与环境学院,重庆400716

出　　处：《生态环境学报》2011年第10期1399-1402,共4页Ecology and Environmental Sciences

基　　金：国家自然科学基金项目(41071323,40971271);国家重点基础研究发展规划项目计划课题(2009CB421104);中国科学院重大方向性项目(KZCX2-YW-T13)

摘　　要：本研究在北京门头沟龙凤岭水土保持科技示范园内进行,降雨前后连续测定土壤微生物量和土壤呼吸,探讨土壤微生物量和土壤呼吸对降雨的响应。结果表明:干旱的土壤降雨后土壤微生物量和土壤呼吸骤升随后逐渐衰减,第1场降雨后土壤微生物量碳、氮和土壤呼吸分别是干旱期的3.08、2.83、2.50倍,第2场降雨后土壤微生物量碳、氮和土壤呼吸分别是干旱期的1.08、1.63、1.68倍,降雨使土壤微生物量和土壤呼吸产生的激增效应仅持续1 d。第3场降雨量仅为0.40 mm,土壤微生物量和土壤呼吸增加的幅度不是很大。To discern the responds of soil microbial biomass and soil respiration to rainfall,we continuously determined changes in soil microbial biomass and soil respiration after and before rainfall.The results showed that soil microbial biomass and soil respiration increased sharply after rainfall and then reduced gradually.Comparing the values after and before for the first rainfall,the soil microbial biomass carbon,nitrogen and soil respiration increased 3.08,2.83 and 2.50 times,respectively.Comparing the values after and before for the second rainfall,the soil microbial biomass carbon,nitrogen and soil respiration increased 1.08,1.63 and 1.68 times,respectively.The surge effect of soil microbial biomass and soil respiration lasted only one day.The third rainfall was only 0.40 mm,the range of soil microbial biomass and soil respiration was unconspicuous.

关 键 词：降雨 土壤微生物量 土壤水分质量分数 土壤呼吸 

分 类 号：S154.3[农业科学—土壤学]