太岳山油松人工林土壤呼吸组分及其影响因子  

Soil Respiration Components and Its Controlling Factors in a Pinus tabulaeformis Plantation in Taiyue Mountain, China

作　　者：汪金松[1] 范娟[1] 赵秀海[1] 夏富才[1,2] 倪瑞强[1] 金冠一[1] 郭依秋[1] 李化山[1] 

机构地区：[1]北京林业大学森林资源与生态系统过程北京市重点实验室,北京100083 [2]北华大学林学院,吉林132013

出　　处：《林业科学》2013年第2期1-7,共7页Scientia Silvae Sinicae

基　　金：国家林业公益性行业科研专项项目(20110400903);国家林业公益性行业专项项目(200904022);华北区(北京;河南;山西)主要森林类型净生产力多尺度长期观测与评价(200804006/rhh-02)

摘　　要：采用挖壕法测定无根和有根样地的土壤呼吸,确定太岳山油松人工林群落土壤呼吸中异养呼吸和根系自养呼吸的贡献率及其影响因子。结果表明:对照与挖壕样方土壤温度和湿度均呈显著的季节变化;2010和2011年土壤呼吸速率和异养呼吸速率均值分别为2.71和2.22μmol·m-2s-1,2010和2011年异养呼吸速率比土壤呼吸速率分别下降了13.7%和21.1%;2010—2011年土壤自养呼吸速率为0.01～0.89μmol·m-2s-1,自养呼吸速率均值为0.49μmol·m-2s-1,2年间自养呼吸速率贡献率为0.2%～37.7%,年均自养呼吸速率贡献率为20.2%;土壤呼吸速率、异养呼吸速率与土壤2,5和10cm深处土壤温度均呈显著指数相关(P<0.001),而土壤呼吸速率、异养呼吸速率与5cm深处土壤湿度的相关性并不显著(P>0.05);利用2cm深处土壤温度拟合土壤呼吸速率和异养呼吸速率时,异养呼吸速率的温度敏感系数Q10值略高;土壤温度和湿度的双变量模型可以很好地解释土壤呼吸速率和异养呼吸速率的季节变化,拟合方程的R2值为0.70～0.78。The trenching plot approach was used to dynamically monitor soil respiration and determine heterotrophic and autotrophic respiration and the controlling factors in a Pinus tabulaeformis plantation in Taiyue Mountain. Results showed that soil temperature and soil moisture displayed obvious seasonal variations. The average soil respiration rate and heterotrophic respiration rate from 2010 to 2011 was 2.71 μmol·m-2s-1 and 2.22 μmol·m-2s-1, respectively. On average, the heterotrophic respiration rate was 13.7% and 21.1% lower than the soil respiration rate in 2010 and 2011 respectively. Autotrophic respiration rate ranged from 0.01 to 0.89 μmol·m-2s-1 with average value of 0.49 μmol·m-2s-1 during the two-year experimental period. The relative contribution of autotrophic respiration rate ranged from 0.2% to 37.7% with annual mean contribution of 20.2% to total soil respiration rate. The relationships between soil temperature at different depth （2, 5, 10 cm） and soil respiration rate, and heterotrophic respiration rate could be described by an exponential equation （P0.001）, however, there was no significant correlation between soil moisture at 5 cm depth and soil respiration rate, and heterotrophic respiration rate （P0.05）. Q10 value of heterotrophic respiration rate was higher than that of soil respiration rate by simulating soil respiration rates with soil temperature at 2 cm depth. Two-variable linear/non-linear models using soil temperature and soil moisture at 5 cm depth can well predict soil respiration rate and explain the variations of soil respiration rate and heterotrophic respiration rate. R2 values of two-variable fitting models ranged from 0.70 to 0.78.

关 键 词：油松人工林 异养呼吸速率 自养呼吸速率 Q10值 土壤温度 土壤湿度 

分 类 号：S718.55[农业科学—林学]