Soil Quality Analysis of Typical Dendrocalamopsis oldhami Forests in Pingyang County,Zhejiang Province

In order to fully understand the soil fertility status of theDendrocalamopsis oldhamiforests and scientifically evaluate the soil environmental quality,the soils of seven D. oldhamiforest sites in Pingyang County,Zhejiang Province were sampled,and the soil physical and chemical properties as well as soil enzyme activities were measured. The principal component analysis was conducted to assess the soil factors. The results showed that the soil bulk density of the bamboo forest was 1.37~1.51 g·cm^-3,the moisture content was 24.33%~27.67%,and the porosity was 43.15%~48.08%. The contents of total nitrogen,total phosphorus and total potassium in the soil were 1.09~2.29 g·kg^-1,0.38~0.61 g·kg^-1 and 21.74~34.41 g·kg^-1,respectively. The contents of soil alkali hydrolyzable nitrogen,available phosphorus and available potassium were 100.98~119.60 mg·kg^-1,2.25~4.94 mg·kg^-1 and 150.56~213.56 mg·kg^-1,respectively. The activities of soil urease,acid phosphatase,nitrate reductase and nitrite reductase were in the ranges of 1 175.09~1 332.93 μg·d^-1·g^-1,6.93~9.22 mg·d^-1·g^-1,19.42~25.52 μg·d^-1·g^-1 and 21.66~28.85 μg·d^-1·g^-1,respectively. The principal component analysis showed that the first five principal components cumulatively contributed 85.18% soil properties of the D. oldhamiforest. The first and second principal components of D. oldhamiforest soil reflected 61.15% of the original data information,in which the absolute values of the feature vectors of total nitrogen,total phosphorus,alkali hydrolyzable nitrogen,available phosphorus,available potassium,total potassium,organic matter,and urease in the soil were relatively high. Therefore,in future management of D. oldhamiforests,it is necessary to continuously regulate the soil nutrient condition by scientific fertilization based on the growth requirements,and avoid non-point source pollution and soil environmental quality deterioration caused by bamboo fertilization.