Monitoring of carbon dynamics in a grassland ecosystem- Analysis of carbon sink or source mechanisms for carbon cycle -

对草地的叶面积指数、土壤呼吸速率、环境因子、土壤微生物生物量和区系进行了研究。冠层生长可分为4个时期，即生长初期(5月下旬)、指数增长期(6~7月)、叶面积指数最大期(8月上中旬)和衰老期(9~10月)。年平均呼吸速率为3.1-3.8 kg CO2 m^(-2)y^(-1)，土壤异养呼吸为2-2.5 kg CO2 m^(-2)y^(-1)。土壤微生物的生物量和区系在空间上(土壤样品之间)是异质性的，但在季节上(在采样期之间)不是异质性的。

We investigated LAI, soil respiration rate (Rs), environmental factors, biomass and flora of soil microbes in the grassland. The canopy growth was distinguished into four periods, i.e. beginning of growth (late May), exponential growth (from June to July), maximum LAI（early to mid August）, and senescence (September to October). Annual rates were estimated as 3.1 - 3.8 kg CO_2 m^(-2)y^(-1)for Rs, and 2 - 2.5 kg CO_2 m^(-2)y^(-1)for soil heterotrophic respiration. Biomass and flora of soil microbes were heterogeneous spatially (among soil samples), but not seasonally (among sampling periods).