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Root biomass of the Chinese fir at different ages and its compatible models
Author(s): 
Pages: 81-86
Year: Issue:  6
Journal: Journal of Nanjing Forestry University(Natural Science Edition)

Keyword:  Chinese fir plantationrootbiomass distributioncompatible model;
Abstract: Based on Chinese fir plantation in Fujian Province, we studied the proportion of root biomass of each compo?nent ( root stake, thick?root, medium?root, small?root, fine?root) with the forest age variation through the fixed sample plot method. We constructed the optimum biomass model of root stake, thick?root, medium?root, small?root, fine?root by using R analysis software. According to controlling the volume and component of root, we built the compatible models and evaluated the models. Results showed that root biomass of the average individual tree decreased with planting age in?crease. Biomasses of different root diameter classes ranked as root stake > thick?root > medium?root > small?root> fine?root. Among them root stake and thick?root accounted for more than 80% of total root biomass. So the thick root were mainly distributed in the 20-80 cm soil layer. The nonlinear compatible model could be established quickly by using R analysis software. It could completely and objectively reflect the distribution relationship of biomasses among various com?ponents( R2>0?77,P>84?7,e<0?153) , solve the incompatibility among the components and improve the accuracy of the models.
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