Effects Of Intimate Natural Management Of Aleurites Montana Eco-forests On The Soil Physiochemical Properties

With the rapid economic development on increasing demand for wood,each country especially China had began expanding plantation acreage.By 2010,our total plantation area ranked first in the world.However,expanding plantation acreage blindly had also brought lots of problems,particularly for the productivity reduction.In order to slove the problems of plantation,Germany foresters took the lead to propose the solution,that is adopting intimate natural management.In the late 20th,the thought of intimate natural forest management was introduced,and had a rapid development.Aleurites montana was the most important oil tree species in the world,and grown widely in China.Currently,the development of Aleurites montana also encountered a similar problem of manual forest,and adopting intimate natural management was a gordian technique to solve plantation of Aleurites montana problems.However,the effect of intimate natural management on Aleurites montana was nearly inexplicitly.Now based on Aleurites montana eco-forests of different managements in Jianyang city,Fujian province,we had researched the effect of intimate natural management on stand structure?soil properties?oil enzyme activity and fractal dimension of soil aggregate structure of Aleurites montana eco-forests,the result showed that:(1)By field investigation and analyzing result of its date,Aleurites montana eco-forests of intimate natual management was adopted to indicate that its tree spedes(especially the shrub layer and the herb layer)increased,the important value of dominant species decreased and the index of diversity also increased.(2)Impact on physical properties of soil,forest land soil bulk density of intimate natural management Aleurites montana decreased,and had a more significant comparative difference than general operating.Capillary porosity and total porosity of soil increased.Moreover,the maximum moisture capacity,capillary water capacity and minimum capacity of soil were all above conventional operation.Impact on chemical properties of soil,forestland soil organic matter eontent and available potassium content of Aleurites montana of intimate natural management were both above that conventional operation,and had a signifieant difference in each soil layer.Soil total nitrogen content,hydrolysis nitrogen content,total phosphorus content and available phosphorus content were all above Aleurites montana forestland of conventional operation,but the significant difference was only in surface soil.Soil carbon-nitrogen ratio was lower than conventional management.And the change of soil total nitrogen content was not obvious with no significant difference.(3)Soil urease?catalase and polyphenoloxidase of Aleurites montana eco-forest of intimate natural management in each soil layer were higher than that conventional management.Among them urease had a significant difference in 0-30 cm,and catalase in 10-40 cm,leave polyphenoloxidase on soil surface.What's more,soil invertase which had a significant difference was higher in 0-20 cm than that conventional management.And soil acid phosphatase with no significant difference didn't change obviously.(4)Soil aggregate structure fractal dimension D of Aleurites montana eco-forest of intimate natural management was lower than that conventional management.Content of soil water-stable aggregates and water-stable big aggregates had a significant linear relationship with fractal dimension.