针阔混交林择伐作业后土壤呼吸与土壤温度和湿度的关系

利用LI8100土壤CO2排放通量的全自动测量系统,对择伐后林地10cm处的CO2通量进行了测定,分析了土壤及各分室CO2排放通量与温度和湿度的关系。结果表明:择伐作业后,林地表面CO2通量与土壤温度和湿度有着较好的相关性,土壤温度和湿度共同解释了林地表面CO2通量季节变化的68.10%~98.9%;枯枝落叶层CO2通量与土壤温度和湿度的相关性较差,土壤温度和湿度共同解释了枯枝落叶层CO2通量的12.60%~89.80%,难以确切说明枯枝落叶层CO2通量与土壤温度和湿度的相应关系;根系CO2通量与土壤温度和湿度的相关性较好,土壤温度和湿度共同解释了根系CO2通量的55.80%~96.70%;矿质土壤CO2通量与土壤温度和湿度的相关性较高,土壤温度和湿度共同解释了矿质土壤CO通量的40.30%~99.50%。

Relationship between Soil Respiration and Soil Temperature, Soil Moisture in Coniferous-broadleaved 1Waxed Forest after Selective Cutting

An experiment was conducted to determine CO2 flux at a depth of 10cm below the soil surface in the forestland after selective cutting by means of LI-8100. The relationship between soil surface CO2 flux and soil temperature, soil moisture was analysed. Results show that soil surface CO2 flux has good correlations with soil temperature and soil moisture, and 68.10%~98.90% of the variation in CO2 flux is caused by soil temperature and soil moisture. There is poor agreement between litter CO2 flux and soil temperature, soil moisture, and 12.60%~89.80% of the variation in CO2 flux results from soil temperature and soil moisture. Root CO2 flux and mineral soil CO2 flux both have good correlations with soil temperature and soil moisture, and 12.60%~89.80% and 40.30%~99.50% of the variation in CO2 flux can be explained by soil temperature and soil moisture respectively.