The Study On The Regulation Of Water Resource Protection Forest(W.R.P.F.)

With the development of economy, the problem on water-resource deficiency will be getting notable. So effectively protecting water-resource becomes one of the important tasks on the ecological field. As a kind of forest ecosystem, water-resource protection forest takes an important part at protecting water-resource. However, at present most of water-resource protection forests have weak function on protecting water resource because of simple forest structure, unreasonable proportion of the forest-types and so on. So it is rather necessary to regulate some water-resource protection forest.According to the data investigated in water resource protection forest around the Miyun Reservoir, Beijing, from the main factors affecting function of water resource protection forest, the author studies the influence of both stand and soil structure on protecting water-resource function, and tried to quantitatively describe stand structure by interference index and discussed the logical area proportion of various forest types by Analytical Hierarchy Process. Finally the author obtained the most optimum forest structure.The main results of the study are as follows:1. The multi-layer stand structure that is rationally composed of arbor layer, shrub layer , herbage layer and litter layer has the best function of protecting water resource. Protecting water-resource function of mixed broad-leaves forests is better function of than that of mixed coniferous and broad-leaves forests. While, the mixed forests is obviously more excellent than the pure forests at protecting water resource.2, By the application of neighborhood interference model to forests of both Platycladus orientalis and Pinus tabulaeformis, The author gets that the neighborhood interference index(N.I.I.) is negatively correlated with the diameter at breast height ,tree height and crown surface but it is positively correlated with the ratio of height-to-diameter. Tree age is significant to the N.I.I. .The research shows that the N.I.I, of the young tree is rather high, and that the neighborhood interference model is more fit to the young forests.3. In order to get the best function of protection water-resource, by Analytical Hierarchy Process, the author obtains that the area proportion of a few forest types around the MiYun reservoir, Beijing, is as follows: the broad-leaves forest 36.69%,the Quercus dentate forest 19.53%, mixed forest of coniferous trees and broad-leaves trees 13.53%, the Finns tabulaeformis forest 11.19%, the Robinia pseudoacacia forest 9.09%, scrub 5.22% and the Platycladus orientalis forest 4.63%.