Song Changchun, Wang Yiyon
Northeast Institute of Geography and Agricultural Ecology, Chinese Academy of Sciences, Changchun 130012, China.
Ying Yong Sheng Tai Xue Bao. 2006 Apr;17(4):625-9.
Through two years located field observation, this paper studied the responses of marsh soil temperature to air temperature and the effects of soil temperature on CO2 emission from marsh soil-vegetation system, and calculated the seasonal variation of CO2 emission. The results showed that from the beginning of thawing, an increasing trend of soil temperature was exerted by the change of air temperature, and there was a significant exponential correlation between soil temperature in root layer and air temperature (R2 = 0.94, P<0.01). Despite of the decreased responses of soil temperature to air temperature with increasing soil depth, the CO2 emission from marsh soil-vegetation system was strongly exponentially correlated with soil temperature in root layer (R2 = 0.84, P< 0.01). An improved model equation was used for calculating the mean CO2 efflux from marsh soil-vegetation system during the growth season in 2003, and the calculated CO2 efflux was 664.5 +/- 213.9 mg2 m(-2) h(-1), approaching the value of located field observation (634.0 +/- 227.7 mg x m(-2) h(-1)), indicating that this model equation was effective to evaluate the CO2 emission from marsh during growth season.
通过两年的实地观测，本文研究了沼泽土壤温度对气温的响应以及土壤温度对沼泽土壤 - 植被系统二氧化碳排放的影响，并计算了二氧化碳排放的季节变化。结果表明，从解冻开始，气温变化使土壤温度呈上升趋势，根层土壤温度与气温之间存在显著的指数相关性（R2 = 0.94，P<0.01）。尽管土壤温度对气温的响应随土壤深度增加而降低，但沼泽土壤 - 植被系统的二氧化碳排放与根层土壤温度呈强烈的指数相关性（R2 = 0.84，P<0.01）。利用改进的模型方程计算了2003年生长季沼泽土壤 - 植被系统的平均二氧化碳通量，计算得到的二氧化碳通量为664.5±213.9 mg2 m(-2) h(-1)，接近实地观测值（634.0±227.7 mg x m(-2) h(-1)），表明该模型方程可有效评估生长季沼泽的二氧化碳排放。
