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2010年采用挖壕法,利用Li-8150土壤碳通量全自动观测仪对东北林业大学哈尔滨实验林场落叶松人工林土壤各组分呼吸通量进行昼夜观测,研究土壤呼吸通量的昼夜和月变化特征,以及对土壤温度的敏感性.结果表明:各月份落叶松的枯枝落叶、根和矿质土壤呼吸通量昼夜变化均呈现单峰形态.5—10月各组分土壤呼吸通量昼夜变化幅度分别在3.1%～12.4%、1.9%～8.7%和10.9%～67.2%;枯枝落叶和根呼吸的平均值分别占土壤呼吸总量的21.2%、11.1%、13.4%、12.0%、14.2%和10.3%、8.8%、11.6%、10.0%、12.5%,昼夜波动幅度较小,月平均值分别为14.3%和10.6%.矿质土壤呼吸平均值分别占土壤呼吸总量的68.5%、80.2%、75.1%、78.1%和73.3%,昼夜波动幅度较小,月平均值为71.5%.枯枝落叶和矿质土壤呼吸通量对地表下10cm的温度敏感性(Q10)显著高于地表,且矿质土壤呼吸通量Q10值高于枯枝落叶呼吸通量.根呼吸通量对地表下10cm处和地表Q10值无显著差异.枯枝落叶和根呼吸Q10值的月变化为低温时较高、高温时较低,而矿质土壤呼吸Q10值则夏季较低、春秋季较高.
In 2010, by digging and ditching method, Li-8150 soil carbon flux automatic observation instrument was used to observe the diurnal and night-time respiration flux of each component of the soil in Larch Plantation in Harbin Experimental Forest Farm of Northeast Forestry University to study the effect of diurnal and monthly And the sensitivity to soil temperature.The results showed that the diurnal variations of respiratory flux of litter, roots and mineral soils in all larches appeared unimodal patterns.The soil respiration flux of each component from May to October The average value of litter and root respiration accounted for 21.2%, 11.1%, 13.4% and 12.0% of the total soil respiration, respectively, with the variation range of 3.1% ~ 12.4%, 1.9% ~ 8.7% and 10.9% ~ 67.2% 14.2% and 10.3%, 8.8%, 11.6%, 10.0% and 12.5% respectively, and the monthly average fluctuations were 14.3% and 10.6% respectively. The mean values of mineral soil respiration accounted for 68.5% of the total soil respiration, 80.2%, 75.1%, 78.1% and 73.3%, respectively, and the monthly and seasonal variations were small with a monthly average of 71.5%. The temperature sensitivity (L10) of litter and mineral soil respiration to the subsurface 10 cm was significantly higher than that of the surface And the Q10 value of mineral soil respiration flux was higher than that of litter leaf respiration flux There was no significant difference in the Q10 value between the surface 10 cm and the ground surface.The monthly changes of Q10 in litter and root respiration were higher at low temperature and lower at high temperature while the Q10 of mineral soil respiration was lower in summer and higher in spring and autumn .