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2007年12月至2008年11月,在华西雨屏区采用0(对照)、50、150、300kg.hm-2.a-1施氮处理和红外CO2分析法,研究了模拟N沉降对慈竹林土壤呼吸特征的影响.结果表明:慈竹林土壤呼吸速率年内季节变化呈明显的单峰型曲线,7月末最高,为(3.36±0.20)μmol.m-2.s-1,2月末最低,为(0.33±0.07)μmol.m-2.s-1.土壤呼吸速率与土壤温度之间呈极显著指数相关(P<0.001),10cm深的土壤温度解释了土壤呼吸速率季节变化的91.6%;而土壤含水量与土壤呼吸之间相关性不显著(R2=0.0758).2008年6—11月根呼吸对土壤总呼吸的贡献率在46%～59%.50、150和300kg.hm-2.a-1施氮处理的年CO2释放量分别比对照低23.6%、46.7%和50.5%.0、50、150和300kg.hm-2.a-1施氮处理的土壤呼吸速率Q10值分别为3.72、3.51、2.95和2.71.
From December 2007 to November 2008, 0 (control), 50, 150, 300 kg.hm-2.a-1 nitrogen fertilization and infrared CO2 analysis were used in the rain-screen area of western China to study the effect of simulated N deposition on The results showed that the seasonal variation of soil respiration rate in Cili Bamboo forest during the year showed a significant single peak curve, which was the highest at the end of July (3.36 ± 0.20) μmol · m-2.s-1, (0.33 ± 0.07) μmol.m-2.s-1. The soil respiration rate was significantly and exponentially correlated with soil temperature (P <0.001), and the soil depth at 10 cm explained 91.6% of the seasonal variation of soil respiration rate While the correlation between soil water content and soil respiration was not significant (R2 = 0.0758). The contribution of root respiration to total soil respiration from June to November in 2008 ranged from 46% to 59% .50, 150 and 300 kg · hm- 2.A-1 nitrogen release was 23.6%, 46.7% and 50.5% less than that of the control respectively. Soil respiration rate Q10 at 0, 50, 150 and 300 kg · hm-2.a-1 Respectively 3.72, 3.51, 2.95 and 2.71.