Studies On The Tending Of Scenic And Recreational Forest In West Mountain, Beijing

Scenic and recreational forest tending is a brand-new research field in our country, and it has extensive development perspective. The ways concerning scenic and recreational forest tending are quite different from other ones, whose purpose is mainly centered on the increase of beauty value and accessibility of forest.Most forest in West Mountain of Beijing has been afforested since the 1950s with the water and soil conservation orientation. Platycladus orientalis, Robinia pseudoacacia and Pinus tabularformis are the main tree species. At present forest in West Mountain has very low scenic attraction, thus forest tending based on scenic and recreational forest characteristics and centered on social benefit while giving attention to other ones is of great necessity due to its special location in Beijing.By utilizing forest resource check data and samplings in West Mountain, the thesis analyses the main site factors affecting the growth of three tree species, Platycladus orientalis, Robinia pseudoacacia and Pinus tabularformis in order to classify forest management types which are also based on age, canopy degree and tree composition whereas cluster analysis is given to shrubbery sublots to classify its types. Rational densities are quantitatively analysed for the above three tree species; Relations between scenic forest tending methods and their beauty value are discussed and models are built up. and the paper also analyses how forest tending methods affecting forest ecological factors like light, temperature and soil water conditions. The results are as follows: Soil thickness is the main factor affecting the growth of Platycladus orientalis and Pinus tabularformis while soil thickness and slope position are the main factors affecting the growth of Robinia pseudoacacia, The management types of Platycladus orientalis, Robinia pseudoacacia, Pinus tabularformis and shrubbery are classified into 7,12,15 and 3 respectively, and special tending advice is given to each management type; Relations between diameter at breast height(d.b.h) and age are quite strong when Platycladus orientalis and Pinus tabularformis sublots are respectively divided into groups by different soil layers and Robinia pseudoacacia by sunny slope and thin soil layer, and rational densities of different age and canopy degree are thus calculated; Beauty value of coniferous stands is positively related to tree height, live branch height and numbers of shrubbery, but negatively related to density, canopy degree and height of shrubbery; and beauty value of hardwood stands is positively related to tree height, live branch height and height of shrubbery, but negatively related to canopy degree and numbers of shrubbery; The changes of ecological factors before and after tending are remarkable as follows: the increase of light, the rise of air temperature, the decrease of air humidity and increase of soil water.Based on what mentioned above, the paper further probes into the scenic and recreational forest tending theory and some new viewpoints such as tree classification ofascenic forest and thinning methods are put forward. In addition, considering the characteristics of West Mountain, tending technologies that need focusing on such as security, privacy, scenic diversity and horticulture measure application are thoroughly discussed.