Applying Nonparametric Kernel Method to Probe the Diameter Structure of Natural Forest

The paper applys Nonparametric Kernel Density Assessment to simulate yield diametric distribution,the source comes from 12 blocks of yield randoms in Wangching Jilin Province. The results show:(1)If randoms can be discribed by Webull and other distributive functions,Kernel Assessment Method can also discribe it,moreover,superior to other distributive functions;(2)Kernel Assessment Method can discribe stand when distribution functions can not discribe it,at the same time,the result is obvious;(3)Both yield and plantation can be discribed by Kernel Assessment Method to analysis stand diameter structure. Nonparametric method perhaps be useful method.