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为了解不同抚育强度下土壤呼吸速率的差异及土壤温湿度对土壤呼吸速率的影响,利用LI-8100土壤CO2排放通量全自动测量系统测定山西太岳山油松人工林不同强度抚育后土壤呼吸速率,同时测量土壤表层10 cm处的温度和湿度.4块油松人工林样地的抚育强度分别为20%、30%、40%和50%,对4块抚育样地及1块对照样地进行3种处理:切根去凋、去凋和对照.结果表明:切根去凋处理条件下抚育样地与对照样地土壤呼吸速率无显著差异(P>0.05);去凋处理条件下抚育样地与对照样地土壤呼吸速率呈显著差异(P<0.01),抚育强度为20%、30%和40%样地6、7月的土壤呼吸速率显著高于对照样地(P<0.01);对照处理条件下,抚育样地与对照样地土壤呼吸速率呈显著差异(P<0.01),抚育强度为30%和40%样地6、7、8月的土壤呼吸速率显著高于对照样地(P<0.01).土壤温度和湿度与土壤呼吸速率显著相关(P<0.01),且共同解释了土壤呼吸速率变化的30%～74%,是影响土壤呼吸速率变化的重要环境因子.
In order to understand the difference of soil respiration rate under different tending intensity and the effect of soil temperature and humidity on soil respiration rate, the soil respiration rate of Pinus tabulaeformis plantation under different intensities was measured by using LI-8100 soil CO2 emission flux automatic measurement system , And measured the temperature and humidity at the soil surface 10 cm at the same time.The tending strength of the four Pinus tabulaeformis plantations was 20%, 30%, 40% and 50% The results showed that there was no significant difference in the soil respiration rate between the tending and the control plots (P> 0.05), and that under the condition of de-withering treatment The soil respiration rate was significantly different between the plots and the control plots (P <0.01). The soil respiration rates of the plots with 20%, 30% and 40% plots in June and July were significantly higher than those in the control plots (P <0.01) (P <0.01). Soil respiration rate in June, July and August with tending intensity of 30% and 40% was significantly higher than that of the control (P <0.01). Soil temperature and humidity were significantly correlated with soil respiration rate (P <0.01) He explained soil respiration variation of 30% to 74%, which is an important environmental factors affect soil respiration rate varies.