落叶松人工林生长季节土壤呼吸通量各组分的变化  

Variations of soil respiration flux components in a Larix gmelinii plantation during growth season

作　　者：孟春[1] 罗京[1] 庞凤艳 

机构地区：[1]东北林业大学工程技术学院,哈尔滨150040 [2]哈尔滨市林业科学研究院,哈尔滨150029

出　　处：《应用生态学报》2013年第8期2135-2140,共6页Chinese Journal of Applied Ecology

基　　金：黑龙江省教育厅科学技术研究项目(11553035)资助

摘　　要：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.By using trenching-box method and Li-8150, an observation on the diurnal and monthly variations of soil respiration flux components in a Larix gmelinii plantation in the Harbin Experimental Forest Farm of Northeast Forestry University was conducted in 2010, with the temperature sensitivity of the flux components analyzed. The diurnal variations of the respiration flux of litter, root and mineral soil presented a single peak pattern. From May to October, the diurnal variation amplitudes of the respiration flux of litter, root and mineral soil were 3.1%-12.4%, 1.9%-8.7%, and 10.9%-67.2%, respectively. The mean values of the respiration flux of litter and root occupied 21.2%, 11.1%, 13.4%, 12.0% and 14.2%, and 10.3%, 8.8%,11.6%, 10.0% and 12.5% of the total, with a small diurnal fluctuation and the mean monthly value being 14.3% and 10.6%, respectively. The mean value of the respiration flux of mineral soil was 68.5%, 80.2%, 75.1%, 78.1% and 73.3%, also with a small diurnal fluctuation and the mean monthly value being 71.5%. The sensitivity of the respiration flux of litter and mineral soil to the temperature at 10 cm soil depth was significantly higher than that to the temperature at soil surface, and the Q10 value of the respiration flux of mineral soil was higher than that of the respiration flux of litter. No significant difference was observed in the sensitivity of the respiration flux of root to the temperature at soil surface and at 10 cm soil depth. The monthly variation of the Q10 for the respiration flux of litter and root was higher at low temperature and lower at high temperature. On the contrary, the monthly variation of the Q10 for the respiration flux of mineral soil was lower in summer and higher in spring and autumn.

关 键 词：枯枝落叶层 根系 矿质土壤 呼吸通量 温度敏感性 落叶松人工林 

分 类 号：S714[农业科学—林学]