Investigation On Soil Characteristics And Fertility Evaluation In Different Altitude Of Phyllostachys Forest

In order to explore the characteristics of the different altitudes Phyllostachys forest soil properties, and further to evaluate their fertility levels. Therefore, this study selected five different altitudes (300m-700m) Phyllostachys forest plots in Da Gang mountain forest area, through analysis of soil physicochemical properties, microbial activities and soil enzyme activities, to explore the character-ristics of Phyllostachys soil characteristics in different altitudes, and further the study use of variance analysis and correlation analysis of mathematical relationship between the soil properties.Finally, using principal component analysis method to evaluate the Phyllostachys forest soil fertility.The results were as follows:The Phyllostachys forest soil properties had changed various in different altitudes,on the whole,with increasing elevation, soil organic matter, total nitrogen, nitrogen, phosphorus, potassium, the number of bacteria and actinomycetes, and microbial volume were increased, total soil porosity, field capacity, saturated moisture content and the number of fungi showed the trend first increase and then decreased, but the soil bulk density decreased and then increased.The soil enzymes activities showed a different variation with increasing altitude. Soilβ-glucosidase and polyphenol oxidase activities increased with increasing altitude, but in the range of 300～500m above sea level increase was not significantly. The cellulase, invertase and amylase activities showed no regular change. In which,the cellulase activities had a significantly variations at an altitude of between 300～500m.Through calculated the total soil enzymes activity of the different altitudes Phyllostachys forest,it showed a difference, in general, with the elevation increased, in the order of 700m>600m>300m>400m>500m.Through correlation analysis, soilβ-glucosidase and polyphenol oxidase activities showed a significant or highly significant correlation with soil organic matter, total nitrogen and other soil properties. Therefore, in evaluation of soil fertility levels, as reflected in indicators of soil fertility was feasible.The invertase activities showed a significant or highly significant correlation with most of soil properties, to a certain extent reflects the level of soil fertility. Cellulase and amylase activities were not suitable for evaluation of soil fertility. Between the other soil properties, the number of bacteria and actinomycetes were significant or highly significant correlation with most of soil physicochemical properties,but the fungi was not significant. To further explore the relationship between soil enzymes activities and soil characteristics,and evaluate the soil fertility of different altitudes Phyllostachys forest soil.Using principal component analysis,by calculated the principal components the system composite score, the elevation of the level of soil fertility under the Phyllostachys forest performance of: 700m>600m>500m>400m>300m.