Effect Of Tending On Chinese Pine And Oriental Arborvitae Non-commercial Forest In Mountain Areas Of Beijing

Nowadays, most of plantation are timber forest used in many area in China and for guaranteeing the high survival rate, the density of initial stocking of trees is generally large. But as the public pay more attention to nature and environment, forest not only satisfy the needs of timber but also the needs of ecological protection. With the development of forestry science and technology, people's awareness of the theory of classified management and sustainable operation of forest resources and the demand of ecology and environment ,the concept of non-commercial forest appeared. At present time The task of classification of non-commercial forest has been finished but what is important is how to manage non-commercial forest scientifically.For many years it is the main method to tend stand for the purpose of modifying stand structure and the tending effectiveness is mainly evaluated by BHD, height ,volume of timber and assortment specification but the studies on the tending shelter forest and aesthetic forest is rare.For better understanding the theory, technology and effectiveness of tending, this study evaluate the tending effect comprehensively according to the variation of biomass, photosynthetic physiology, soil moisture, soil physicochemical characteristics, micro-environment in order to provide the theoretical basis for the management of non-commercial forest in Beijing.This paper takes Chinese pine and oriental arborvitae as example ,which are the main part of non-commercial forest in Beijing mountain area. Fixed sample plots for different stand types(low-mountain, positive-slope and thin-soil oriental arborvitae, low-mountain, positive-slope and thick-soil oriental arborvitae, low-mountain, negative-slope and thick-soil oriental arborvitae, low-mountain, negative -slope and thick-soil Chinese pine) are set up according to site quality .Each stand types is treated with different tending intensity(no tending ,slight tending, moderate tending and intensive tending). Chinese pine are treated with comprehensive tending method and Oriental arborvitae is treated with low-thinning method to study the stand tending impact on soil, micro climate and tree growth. The results shows:...