Evaluation of Soil Quality in Two Different Ages of Taxodium Hybrid ‘Zhongshanshan’ Forest plantations
This studyexamine d soil physicochemical properties and microbiological indicators of 5 and 9 year-old Taxodium hybrid ‘Zhongshanshan'plantations in Mucheng Park and Eastlake Park in Jiangsu Province,China.An adjacent bare land was also investigated to serve as a control.Canonical correlation analysis showed that change in soil microbial biomass was complex and attributed to several factors in soil.With increase in soil depth,U and V values decreased in 5 a and 9 a forest plantations and control,respectively.At the same soil layer,U and V values exhibited as 9 a ＞ 5 a ＞ control.Correlation analysis indicated that soil microbial biomass waspositively correlated (P ＜ 0.01) with the content of available phosphorus,available potassium,soil organic matter and total nitrogen.Meanwhile,principal component analysis (PCA) exhibited that the 9 a plantation scored the highest of 2.993,indicating the highest soil quality,followed by 5 a plantation and bare land,which were scored 0.748 and-3.742,respectively.In a word,T.hybrid ‘Zhongshanshan'plantations increased not only soil physicochemical properties but also soil microbial biomass,showing significant effects of T.hybrid ‘Zhongshanshan'plantations on the improvement of soil quality.
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