西藏天然林直径分布模型及其应用研究

以西藏自治区2006年森林资源连续清查的479个天然林实测样地资料为基础，利用相对直径和累积概率的概念，借鉴相对树高曲线模型的建模方法，研究建立了冷杉、云杉、柏木、松类、栎类、桦类、阔叶类、针阔类等8个树种（组）的直径分布累积概率模型。通过与常用于天然异龄林直径分布结构的Weibull分布函数的拟合结果进行对比分析，表明所建模型效果良好。所建的直径分布累积概率模型为预估林分直径分布结构提供了参考依据，尤其为2006年西藏森林资源连清遥感样地和目测样地的样木模拟提供了定量依据。

Research on Establishment and Application of Diameter Distribution Models for Main Tree Species of Natural Forests in Tibet

Based on the concepts of relative diameter and summed probability, and taken the modeling method of relative tree height curve model for reference, the diameter distribution models for 8 main tree species of natural forests in Tibet are established by using more than 16 thousands sample trees from 479 ground plots of Continuous Forest Inventory for Tibet in 2006, and the application methods are also discussed. The models are better than that established by using Weibull function which is commonly used for simulation of diameter distribution for natural uneven-aged forests. All models can be used for projection of diameter distribution of natural forests in Tibet, especially for the emulation of remotely sensed plots of CFI in 2006.