The Study On Health Rank Of The Planted Pine Forest Ecosystem About Hill Mountainous Area In South Jiangsu

This article discussed the characters about the output strenth of the Judeich,physical and chemistry nature of the soil,inner structure of the Judeich , Soil enzyme and the resistivity amang 4 different ages,planted pine forests ,based on the Nanjing Tongshan tree farm,the results are as follows:(1) The speed of the increases on height and biomass-down the tree decreases along with the age of the forest.The rate of increment on chest and crown decreases gradually after 18 years later.(2) The condition of the soil pores has the remarkable difference along with the age of forest amang different level's change of the soil and worsens gradually along with the age of forest.The content of the TN, TP,organic in the soil have a remarkable positive correlation with the age of the forest.The content of the TK and pH value of the soil have a remarkable, inverse correlation with the age.But, overall, the planted pine forest's has a positive sense to the soil physical and chemistry nature.(3) As the inner structure,the score increases gradually along with the age of the forest,based on the model used in the article.This means that the function of the inner structure tends better gradually along wi??he age of the forest.(4) As the nature of the resistivity,the 28 year-age Planted Pine forest is better than the other forests obviously.(5) The activiness of the Catalase, Sucrase,Srease and the Phosphatase have remarkable positie correlation with the age of the forest.The score on factor of Soil Enzyme increases gradually along with the age of the forest,based on the model used in the article, This means that the the pine forest has certain positive sense to the Soil Organisms character's improvement and so does the maintenance.(6) The order of synthesis score amang the 4 different kinds of planted pine forest is 36 year-age>28 year-age> 18 year-age> 8 year-age.The health rank of the 8 year-age Planted Pine forest is extremely ill, the 18 year-age Planted Pine forest healthy rank is the low,and the 28 year-age Planted Pine forest healthy rank is near to healthy. The 36 year-age Planted Pine forest healthy rank is healthy.