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2004年5月至9月,研究了长白山白桦林土壤呼吸以及根系呼吸对土壤呼吸的贡献随土壤温度和土壤湿度的季节变化,研究结果表明:土壤总呼吸、断根土壤呼吸和根系呼吸在生长季内有相似的季节变化趋势,夏季潮湿而且温度较高,呼吸速率也较高,春季和秋季温度较低,呼吸速率也较低。2004年5月至9月,土壤总呼吸、断根土壤呼吸和根系呼吸的平均值分别为4.44,2.30和2.14μm01·m-2s-1,三者与土壤温度均呈指数相关,与土壤湿度呈线性相关,三者的Q10值分别为2.82,2.59和3.16,这与其他学者的结果相似。根系呼吸是土壤呼吸的一个重要组成部分,2004年5月至9月,根系呼吸对土壤总呼吸的贡献在29.3～58.7%之间。根据Q10模型估算的土壤总呼吸、断根土壤呼吸和根系呼吸的全年平均值分别为1.96、1.08和0.87μmo1·m-2s-1,即741.73、408.71和329.24gC·m-2·a-1,全年根系对土壤总呼吸的贡献为44.4%。土壤呼吸和土壤温度之间的关系模型是了解和预测长白山白桦林生态系统潜在的随森林管理和气候变化而变化的有用工具。
From May to September 2004, the contribution of soil respiration and root respiration to the soil respiration of Changbai Mountain birch forest was studied with seasonal changes of soil temperature and soil moisture. The results showed that soil respiration, root respiration and root respiration in the growing season There is a similar trend of seasons, wet in summer and higher in temperature, higher in respiration rate, lower in spring and autumn, and lower in respiration rate. From May to September in 2004, the average values of soil total respiration, root respiration soil respiration and root respiration were 4.44, 2.30 and 2.14μm01 · m-2s-1, respectively, and the three were related to the soil temperature exponentially with the soil moisture The Q10 values of the three are 2.82, 2.59 and 3.16, respectively, which are similar to those of other scholars. Root respiration is an important part of soil respiration. From May to September 2004, the contribution of root respiration to total soil respiration was between 29.3% and 58.7%. According to the Q10 model, the annual average values of total soil respiration, root respiration soil respiration and root respiration were 1.96,1.08 and 0.87μmo1 · m-2s-1, namely 741.73, 408.71 and 329.24gC · m-2 · a-1 The annual root contribution to total soil respiration was 44.4%. The model of the relationship between soil respiration and soil temperature is a useful tool for understanding and predicting potential changes in the birch forest ecosystem in Changbai Mountain as a function of forest management and climate change.