草毡寒冻雏形土土壤CO_2释放量估测方法初探

METHODS OF ESTIMATING CO_2 EMISSION FROM MAT CRYO-SOD SOIL

应用 1 998年 5月～ 1 999年 4月草毡寒冻雏形土土壤CO2 释放通量的实测资料 ,通过对常用的三种土壤CO2 释放量估测方法的比较分析 ,提出了适合草毡寒冻雏形土土壤CO2 日及年释放量的估测方法。土壤CO2 日释放量的估测是以土壤CO2 释放通量为因变量 ,时间为驱动变量 ,建立时间与土壤CO2 释放通量的一元四次多项式 ,通过对时间的求导积分 ,得出土壤CO2 日释放量。土壤CO2 年释放量的估测是以测定日的土壤CO2 日释放量为因变量 ,以气候、土壤环境因子 (降水、蒸发、日照、气温、土壤 0～ 30cm地温等 )为驱动变量 ,建立土壤CO2 的日释放量与气候、土壤环境因子之间的多元非线性经验公式 ,应用气象站气候、土壤环境因子有关资料 ,逐日计算出其土壤CO2 的日释放量 ,最后应用累积法 ,可估测土壤CO2

Analysis of three different methods of estimating CO 2 emission was carried out by comparing the data obtained from filed determination of soil CO 2 emission from Mat Cryo-sod soil in 1998～1999. Based on the results of the analysis a suitable method of estimating CO 2 emission form Mat Cryo-sod soil was developed.\;The equation for estimation of diel CO 2 emission is a monadic biquadratic multinomial with instantaneous CO 2 emission flux as dependent variable and time as drive variable. And by deriving the integral to time, the values of the diel CO 2 emission can be obtained. For estimation of annual emission, a multi-nonlinear experiential formula was established with diel CO 2 emission as dependent variable and environment factors as drive variable (such as precipitation, evaporation, sunshine, air temperature, soil temperature, etc.). Diel CO 2 emission was calculated using related data from the meteorological station every day, and then the annual accumulated CO 2 emission was obtained.\;