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Study on the density effect model of Tsuga tchekiangensis population in Wuyi Mountain area

HE Jian-yuan1,YOU Wei-bin2,WU Yan-yu1,KE Xian-shi1,XU Zi-kun1,FAN Yan-hong1,ZHENG Qun-li3(1.Administrative Bureau of Wuyishan National Nature Reserve,Wuyishan,Fujian 354300,China;2.College of Life Science,Fujian Agriculture and Forestry University,Fuzhou,Fujian 350002,China;3.Wuyishan Institute of Biology,Wuyishan,Fujian 354300,China)  
The density effect of Tsuga tchekiangensis population was analyzed by the theoretical model describing the whole density change process of plant population,i.e.,N=exp(aln2S+blnS+c) where N and S represent population density and mean basal area of at breast height respectively,and a,b,c are parameters.The result of which was described as N=exp(4.385 15ln2S+11.941 98lnS+10.738 76) r=0.889 5.At the same time,there is a poor correlation r=0.553 2,by simulating the population density of species associated species.Model simulation results showed that the population density of T.tchekiangensis not only influenced by self-thinning effects,but also by associated tree species.The impact of self-thinning was primarily due to decreasing of T.tchekiangensis population density.The simulated results showed that the model fitted well observed data from T.tchekiangensis population.Therefore it is very useful in practice,which will provide a scientific basis for density management of T.tchekiangensis population.
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