华北土石山区植物群落土壤呼吸特性及其影响因子

摘要

Soil respiration of typical plant communities of earth-rock mountain region in Northern China was studied with IRGA. The results showed that the diurnal dynamic of soil respiration appeared as a single peaked curve with the peak presenting at about 15:00. The highest value of soil respiration was in summer, while the lowest was in winter. Community types, soil temperature and soil humidity were the main factors affecting the soil respiration.%采用红外气体（IRGA)法对华北土石山区植物群落土壤呼吸速率、土壤温度和湿度进行测定。结果表明，土壤呼吸速率日变化呈单峰曲线，最大值在15：00左右，最低值在日出前后；季节变化比较明显，土壤呼吸速率夏季最高，冬季最低；呼吸速率大小受群落类型、土壤温度、土壤湿度等因子影响。