Application of Five Types of LogisticModels Im itating theStand BasalArea Distribution ofChinese Fir Plantation

SUN Hong-gang; ZHANG Jian-guo; DUAN Ai-guo; TONG Shu-zhen

The Log isticmode ls are sub jected toex tensive applica tion, because theycan reflect the basic regu la tion ofpopu lation grow th w e l.lW e discuss the application of Log ist ic models and the ir improved ones to im itate the standbasal area of Ch inese Fir(Cunn inghamia lanceolata( Lamb. )Hook. ) p lantations. On the basis of same stand densi??ty, w e found thatw ith the increment of sit index, the higher the im itating precise, themore sign ificant the inf luenceof site qua lity tomodels; On the basis of same site qua lity, w e found that stand density influences the im itat ing pre??cise of a ll themodels. And w e also found that therew as no re lationship between the im ita ting precise and stand age.A s for the certain p lant popu lation, different type ofmode ls aced of the ir ow n accord. Compared w ith the o ther fourtypes o f Log isticModels, Z??Log isticModel had themost stab le parameters and the h ighest im itating precise wh ich,w e th ink, is the best to im itating the stand basal area ofCh inese F ir plantations. The parameters o f improvedmode lshad d irect influence on Log ist icmodels to im itate the curve shape, using as shape parameters.

1. Research Inst itu te ofForestry, CAF

Received Date: 2007-01-25

Abstract: The Log isticmode ls are sub jected toex tensive applica tion, because theycan reflect the basic regu la tion ofpopu lation grow th w e l.lW e discuss the application of Log ist ic models and the ir improved ones to im itate the standbasal area of Ch inese Fir(Cunn inghamia lanceolata( Lamb. )Hook. ) p lantations. On the basis of same stand densi??ty, w e found thatw ith the increment of sit index, the higher the im itating precise, themore sign ificant the inf luenceof site qua lity tomodels; On the basis of same site qua lity, w e found that stand density influences the im itat ing pre??cise of a ll themodels. And w e also found that therew as no re lationship between the im ita ting precise and stand age.A s for the certain p lant popu lation, different type ofmode ls aced of the ir ow n accord. Compared w ith the o ther fourtypes o f Log isticModels, Z??Log isticModel had themost stab le parameters and the h ighest im itating precise wh ich,w e th ink, is the best to im itating the stand basal area ofCh inese F ir plantations. The parameters o f improvedmode lshad d irect influence on Log ist icmodels to im itate the curve shape, using as shape parameters.

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Reference (20)

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Application of Five Types of LogisticModels Im itating theStand BasalArea Distribution ofChinese Fir Plantation

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