Characteristics of Different Forest Stands of Community Diversity and Soil Physicochemical Properties and Enzyme Activities in Albizia odoratissima Forests in the Dry and Hot River Valleys of Guangxi
To investigate the spatial and temporal patterns of forest community diversity,soil physicochemical properties,and enzyme activities in different forest stands of Albizia odoratissima,natural forests of A.odoratissima of various ages were collected from the Yachang forest field of Guangxi.One-way analysis of variance and correlation analysis were used to study the changes in the communities and soils of the forests of A.odoratissima with the successional process.The results revealed that as the forest stand area increased,the soil and community of A.odoratissima forests changed.The soil pH shows a de-creasing trend,and it is acidic;the soil nutrient contents tend to increase and then decrease,and H accumulates more soil nu-trients;M has the highest C:P and N:P;the ACP activity of Y is higher than that of M;the tree layers have the highest C:P and N:P.The ACP activity of Y is higher than that of M;the Shannon index is significantly higher in M than in Y and H in the tree layer;the Shannon index and Pielou index are remarkably the highest in Y in the herb layer,whereas the Simpson index is significantly lower.The soil physicochemical properties show significant positive correlations with the Simpson index,SAC,CAT,and ACP,negative correlations with the Shannon index,Pielou index,and URE,and negatively correlated with enzyme activities and stoichiometric ratios.The forest age had a significant effect on the vegetation community and soil of the A.odoratissima forest,and there was a strong association between the plant community and the soil's physicochemical properties and enzyme activities.
Albizia odoratissimasecondary forestscommunity diversitysoilenzyme activityphysicochemical propertiesdry and hot river valleys
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