Analysis And Research For Stand Structure And Productive Efficiency Of Main Forest Community In Saihanba

This paper use Larch, pine, aspen, birch four main tree species for study of objects in saihanba, from stand structures, stand biomass, productivity and forest productivity analysis research designed to provide the saihanba area of forest management and the management provides the theoretical basis of science. The major conclusions include the following:(1) On research in four major forest types (Larch, pine, aspen, birch) diameter, tree height for distribution and simulation research results show: forests of diameter and height of the structure of distributions to be rendered on the normal distribution law; Scotch pine and birch forest diameter distribution consistent with normal simulation, and Scots pine and trees that davidiana Division advanced simulation in line with the normal distribution simulation distribution. On the different types of shrubs and herbaceous layerαspecies diversity andβdiversity analysis, the results can be: herbaceous species abundance indices were better than the large shrub layer, poplar and birch shrub species richness index is greater than the larch and Scotch pine, birch forests of herbaceous layer abundance indices is the largest, most davidiana points; diversity index shrub layer of Simpson and Shannon-Wiener diversity index showing the largest forest respectively Scotch pine, poplar, and the smallest are the larch, herbaceous Simpson and Shannon-Wiener diversity index showing the largest forests are the larch forest, birch, and the smallest is davidiana; uniformity index of shrub layer of Jsw and Jsi performance of the largest forest are Scotch pine, larch, herbaceous layer of uniformity index Jsw and Jsi differences are not large, Pinus sylvestris uniformity index Jsw Max, larch uniformity index Jsi maximum, white birch and Populus tremuloides are relatively small. Different forest types shrub layer between and herbaceous layer different coefficients are large, their common species are relatively small.(2) According to the saihanba region near 15～30 years to the four main tree species for productivity analysis, reflecting the saihanba productivity in main tree species, its corresponding average productivity, where the average productivity pines up to 6.53 t·hm^-2·a^-1; this was followed by sales of larch and Populus tremuloides, namely 5.36 t·hm^-2·a^-1 And 3.21 t·hm^-2·a^-1; the average productivity of a minimum as 3.13 t·hm^-2·a^-1。According to the saihanba region near 30 years of weather data analysis, reflecting the saihanba region near 30 years climate productivity range in 12.48 - 14.52 t·hm^-2·a^-1, between the 1989 years minimum climate productivity when 12.48 t·hm^-2·a^-1, in 2007 , the highest climate productivity as 14.52 t·hm^-2·a^-1, average climate productivity as 13.70 t·hm^-2·a^-1. According to the four main tree species near 15 30 years production efficiency, its corresponding average productivity, where the average Pinus sylvestris productivity up to 0.49 ; this was followed by sales of larch and Populus tremuloides, namely 0.39 and 0.25 ; the lowest average productivity as 0.23.