摘要
在调查黄河小浪底山地植物物种多样性指数和海拔、坡度、坡向、土壤状况等环境因素的基础上,采用主成分分析的方法对生态因子进行筛选,根据影响因子的作用大小,采用聚类分析的方法对样地进行群落恢复进程的分类,利用判别分析技术建立各恢复阶段的判别公式。结果表明:1)研究区植物群落可以划分为15种类型,其中乔木群落4个,灌草群落6个,草本群落5个;2)土壤和地形等环境因子、土壤流失等生态因子对多个公共因子都有较大的载荷。多样性指数H′,D1,P,Jsw,D2等在第1主分量上、石砾含量在第2主分量上、土壤流失程度、土壤厚度以及坡向和土壤类型在第2、第3主分量上都有较大载荷,海拔在3个主分量上载荷都较小;3)黄河小浪底山地植被恢复期可以分为4个恢复阶段:恢复初期阶段,其群落占27%;进展阶段,其群落占40%;恢复中期阶段,其群落占20%;恢复稳定阶段,其群落占13%;4)所建立的判别模型是可靠的,在判识植被恢复阶段有显著效果。
Based on the analysis of species diversity indices, altitude, slope, soil of the ecosystems in Xiao langdi mountain region, the factors impacting degraded ecosystems were studied by the Principle Component Analysis（PCA）. The restoration degree of vegetation in this region had been studied using cluster analysis in this paper. The models predicting the restoration stage was established using Discriminant analysis. The results show that： 1）the i, egetation in this areas can be divided into 15 communities, according to plant life-form , trees, shrubs, herbs have 4,6 and 5 types respectively. 2） soil , landform and soil erosion have big load. The diversity indexes, including H＇, D1, P, Jsw, D2 have higher contributing rate to the first principal component. The stone amount in soil has only lager load on the second principal component. Erosion and soil depth, soil type, slope direction have relatively contributing rate on the second, third principal component. Altitude has lower load on the three principal components. 3）The vegetation in the studying areas can be classified into 4 types, including initial restoration stage（IRS）, progressive restoration stage （PRS）, middle restoration stage （MRS）, stable restoration stage （SRS）. 4） the percentage of IRS, PRS, MRS, SRS was 27 %, 40 %, 20 % and 13% , respectively. 5）the discriminant models established by discriminant analysis are credible and good for predicting vegetation restoration stages.
出处
《中国水土保持科学》
CSCD
2007年第1期77-83,共7页
Science of Soil and Water Conservation
基金
"十一五"国家科技支撑项目"华北土石山区植被恢复与重建技术试验示范"
河南省科技攻关项目"典型退化生态系统恢复
重建机理及生态工程设计示范研究"(0624090010)
关键词
山地
退化生态系统
植被恢复
主成分分析
聚类分析
判别分析
mountain region
degraded ecosystem
vegetation restoration
principle component analysis（PCA）
cluster analysis
discriminant analysis
作者简介
赵勇（1962-），男，教授。主要研究方向：生态恢复和生态评价。E-mail：zhaoyonghnnd@163．com。
