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| Classification of typical degraded ecosystems at different stages of vegetation restoration:A case study in Xiaolangdi hilly areas,Henan Province,China |
| Zhao Yong1,Wang Pengfei1,Fan Wei2,Yan Liang1 |
| 1.Henan Agricultural University,450002;2.The Henan Academy of Forest Sciences,450003: Zhengzhou,China |
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Abstract Based on the analysis of species diversity indices,altitude,slope,soil of the ecosystems in Xiaolangdi 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 vegetation 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.
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Received: 20 June 2006
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