长白山森林土壤有机碳分解动态通用模型探索

A Decompositon Dynamics Model for Soil Organic Carbon in Changbai Mountain Area

针对土壤有机碳在实验室培养条件下呈现出前期快速分解和后期缓慢分解的特征,提出了建立土壤有机碳分解动态模型的思路:kc=a{1+[b(t/c)d-1]/et/c},其中a,b,c,d为待定参数,运用SAS9.0的非线性过程和研究样点培养数据可以确定不同处理的对应参数值。对长白山森林土壤的研究表明:该通用模型可以有效表达土壤有机碳分解动态,运用模型拟合速率计算出的土壤碳库大小和各碳库周转时间与实测速率计算的值具有较好相关性;在研究区参数a为土壤总有机碳含量因子(R2=0.8479);参数b为土壤粘粒因子(R2=0.8549);参数c为土壤惰效性碳和pH因子(R2=0.8976);参数d为土壤惰效性碳因子(R2=0.5310)。

Proposed the general model for soil organic carbon decomposition according to the phenomenon of its fast decomposition in early stage and slow decomposition in late stage in laboratory fostering： kc= a { 1＋[b （t/c）^d-1]/e^t/c}. a, b, c, d are parameters to be determined by the non--linear process in SAS9.0 and measured data for each disposal. The research in Changbai Mountain forest soils shows that. the general model can simulate the decomposition of soil organic carbon dynamics effectively; soil carbon pool size and mean residue time calculated with model data have a good correlation with these calculated with measured data. In the study area parameter a is related to total soil organic carbon content of the soil （R^2 =0. 8479）; parameter b is related to soil clay （R^2 =0. 8549）; e parameter is related to passive soil organic carbon and pH （R^2=0. 8976） ; parameter d is related to passive soil organic carbon （R^2 =0. 5310）.