Dynamic of Soil Phenolic Acids and Enzyme Activities in Pure and MixedStands of Eucalyptus grandis×Europhylla and Acacia mangium Plantation
The distribution characteristics of soil enzyme activities,pH and phenolic acids including p-hydroxybenzoic acid,vanillic acid,benzoic acid,ferulic acid and cinnamic acid,as well as the relations between phenolic acids and enzyme activities,pH were studied in the pure and mixed stands of Eucalyptus grandis×E.urophylla and Acacia mangium plantation.The results were as follows:(1)The contents of soil phenolic acids were higher in root zone than those in forest field soil,which implied the phenolic acids were mainly distributed around root zone and declined with the increase of the soil depth.In the pure forests,the contents of phenolic acids in both root zone and field soil in Eucalyptus grandis×E.urophylla were higher than those in Acacia mangium forest,while they were lower in mixed forest than those in pure forest except being higher in root zone of Acacia mangium in mixed forest than those in pure Acacia mangium stand.(2)In the three types of forest,the contents of vanillic acid were the highest while cinnamic acid were the lowest,especially,just were detectable in root zone.The highest contents of p-hydroxybenzoic acid were detected in both root zone and field soil in Eucalyptus grandis×E.urophylla pure plantation.(3)The changes of three soil enzyme activities were complicated to some extent,but the activities of urease,phosphatase,and polyphenol oxidase performed best,respectively,in 0~20cm depth of non-root zone in mixed forest,in root zone in pure Eucalyptus grandis×E.urophylla plantation,and in root zone in pure Acacia mangium plantation.(4)In the above three stands,the contents of phenolic acids showed the significant negative correlation with pH value,but non-significant correlation with urease and polyphenol oxidase activities.The contents of phenolic acids presented positive correlations with phosphatase activity,among which,p-hydroxybenzoic acid and vanillic acid showed higher and not significant related coefficients with the contents of phenolic acids.
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万方数据
维普
