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Plant Species Diversity and the Relation with Soil Properties in Natural Succession Process in Ziwuling Area

WANG Kai-bo1,CHEN Mei-ling1,QIN Juan1,LIU Yong1,AN Hui1,SHANGGUAN Zhou-ping2(1 Institute of Soil and Water Conservation,Northwest A & F University,Yangling,Shaanxi 712100,China;2 Institute of Soil and Water Conservation,Chinese Academy of Sciences,Yangling,Shaanxi 712100,China)  
Base on the survey of community plots and laboratory analysis,we studied the plant species diversity,soil properties and their relationship in different successional stages with correlation analysis and multiple regression methods in Ziwuling area on Loess Plateau.The results showed that the trend of the species diversity with succession is not completely linear,because the species diversity index is higher in herbaceous successional stage than that of the shrub's.Soil total nitrogen,available nitrogen and soil organic matter of the 0~20 cm and 20~40 cm layers increase with the vegetation succession.The soil water content is increasing with a little fluctuation and the soil bulk density declined with some fluctuation.It indicated that the soil environment is improved with the vegetation succession.The changes of 40~60 cm soil layers are not followed with some rules,which showed there is no causal links with the succession of vegetation.The correlation analysis between species diversity and soil factors showed that there are certain correlations between them in the process of evolution,and the soil nitrogen and soil organic matter of 0~20 cm layer are positive significantly correlated with the species diversity index.The effects of species diversity on the soil properties are weakening with the increasing soil depth.
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