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中文摘要：
碳是一切有机体的基本成分，也是构成生物体的主要元素。自工业革命以来，由于人类大量燃烧化石燃料和过度采伐森林等原因，导致大气中的CO2浓度不断升高，严重威胁着全球生态系统和人类自身的生存与发展，已经引起国际社会的高度关注。土壤呼吸作为土壤碳的主要输出途径和重要的大气CO2源，对其进行精确测定已成为全球变化研究中的关键问题之一。土壤呼吸及其影响因素的研究，是预算全球碳素平衡和变化潜在效应的基础。受多种因素影响，土壤呼吸研究仍十分薄弱。
英文摘要：
The soil respiration rate was measured with an IRGA in the natural Larix gmelinii forest of the Northern Great Xing＇anling Mountain in the cool temperate zone. The environmental factors were recorded using the weather equipment. The soil respiration showed obvious diurnal variation and a total 706 gC· m^- 2 was released during the plant growth period （ May. 1^th ～Oct. 31^th）. The soil respiration rate was influenced significantly by soil tempeture in this zone, and a significant postive correlation was found between soil respiration rates and soil tempetures in 10 cm depth （ r = 0. 879 5 ）. However the soil respiration was not significantly influenced by the soil moisture. Furthmore, there was a negative relationship between the soil respiration rate and air CO2 contiontration of the air in forest （ r = - 0.426 1）. The results from the experiment can provide the basical materials for the calculation of carbon flux in the northern cool temperate zone of China.
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