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Influence of Environmental Factors on Soil CO2 Efflux and Its Spatial and Temporal Variations in Sub-alpine Scrub Forest of Qilian Mountains
Pages: 666-672
Year: Issue:  5
Journal: JOURNAL OF GLACIOLOGY AND GEOCRYOLOGY

Keyword:  土壤呼吸速率时空变化温度湿度根系生物量亚高山灌丛林祁连山;
Abstract: 采用美国Li-COR公司生产的LI-6400-09土壤呼吸室和LI-6400便携式光合作用测量系统,在2004年生长季节对祁连山亚高山灌丛林土壤呼吸速率进行了连续观测.结果表明:在整个生长季祁连山亚高山灌丛林土壤呼吸速率的空间变化为随着海拔梯度的增加,土壤呼吸速率逐渐减小,其变异系数逐渐增加;生长季节土壤呼吸速率晚间维持在较低水平,2:00~6:00最低,在7:00~8:30开始升高,11:00~16:00达到最大值,16:00~18:30开始下降,整个过程呈单峰曲线.土壤呼吸速率的日平均值介于(0.79±0.60)μmol·m-2·s-1~(2.49±0.97) μmol·m-2·s-1.土壤呼吸速率7~8月份达到最大值(5.861 μmol·m-2·s-1),5月与9月份次之,4月与10月份基本一致,整个生长过程总的变化趋势呈单峰曲线形式.亚高山灌丛林土壤呼吸的空间变异主要受温度、水分和植物根系的综合影响.
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