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.%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1d.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.
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