臭松天然次生林立地质量综合评价系统研究

Study on Comprehensive Evaluation System of Site Quality for Natural Secondary Abies nephrolepis Forest

以吉林省汪清县臭松天然次生林为研究对象,利用172块小班数据、178块复位样地数据及96株解析木数据,依据臭松天然次生林立地质量、臭松基准年龄时优势木平均高及单位面积林分蓄积,建立了汪清臭松天然次生林立地质量综合评价系统:共划分36个立地类型,确定了立地类型对应的地位指数以及各龄阶单位面积林分蓄积量的理论值;系统将立地质量等级分为好(Ⅰ)、中(Ⅱ)、差(Ⅲ)3个等级。立地质量好(Ⅰ)的地段,海拔较高、土层较厚、坡度平缓且多为阴坡,林分结构完整,单位面积林分蓄积量高,立地质量中(Ⅱ)的地段是抚育经营的重点,以保持林分稳定,促进进展演替;立地质量差(Ⅲ)的地段,海拔较低、土层较薄、坡度大且处于阳坡、林相差、类型复杂,林分单位面积林分蓄积量低,是保护恢复的重点,立地质量综合评价系统的建立的利于臭松次生林科学经营。

In this study,natural secondary Abies nephrolepis forest of Wangqing County,Jilin Province is regard as research object using 172 subcompartment data,178 reset sample plot and 96 anatomical tree data. Based on the site classification results,the height of dominant Abies nephrolepis at the basal age,and the unit area stand growing stock,the site quality comprehensive evaluation system of the Abies nephrolepis secondary forest of Wangqing district is established. The stand unit area growing stock,the site quality is classified into three grades：good（Ⅰ）,medium（Ⅱ）and poor（Ⅲ）. The site with good quality（Ⅰ）has relatively high altitude,thick soil layer,gentle slope most of which are shade slopes,good forest form,complete structure and high comprehensive benefit. The medium （Ⅱ）quality site is the key point of tending and management to keep the stability of the stand and to promote progressive succession. The poor （Ⅲ） quality site has lower altitude,thinner soil layer,bigger slope most of which are sunny slopes,bad and complicated forest form for which differential measures can be taken based on the site evaluation results during the course of forest management.