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中文摘要：
以江西大岗山杉木人工林为研究对象,采用LI-6400便携式光合测定系统及土壤呼吸叶室6400-09,在2005年4—10月和2006年4—10月,连续测定了2个生长季的土壤CO2释放速率,并对土壤呼吸规律进行了分析研究。结果表明,土壤呼吸的日动态和季节动态都呈单峰型;土壤呼吸速率与地表空气温度和0～10 cm土壤温度的指数回归关系良好,但单独用土壤含水率的变化解释土壤呼吸速率变异是不合适的。选择0～10 cm土壤温度和0～10 cm土壤含水率解释土壤呼吸速率的变异,双因子模型比单因子模型好。根据土壤呼吸速率与0～10 cm土壤温度的指数模型,结合试验地2006年1—12月的气象资料,计算出大岗山杉木人工林土壤呼吸年释放碳量为9.80 t.hm^-2。
英文摘要：
Based on a major type of plantation, Chinese fir plantation in Jiangxi, LI-6400 portable photosynthesis measurement system and its soil respiration fitting 6400-09 have been employed to measure the CO2 emission rate of soil during its two consecutive growing seasons, from April to October in 2005 and 2006, and the rules of soil respiration were also studied. The results show that the curves of both diurnal and seasonal dynamic variations of soil respiration rate present ＂single peaks＂. In the diurnal time scale, soil respiration rate shows good exponential relationship with surface air temperature and 0-10 cm soil temperature. However, it is inappropriate to explain the variance of soil respiration rate using the variation of soil water containing rate alone in different time scales. Therefore, the double-factor model is better to explain the variance of soil respiration rate than the single-factor model. Based on the exponent model, R=0.946e^0.064（n=44, r^2=0.846）, combined with 0-10 cm soil temperature data, it is calculated that the annual carbon emission of soil respiration is 9.80 t. hm^-2. a^-1.
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