The Effect Of Vegetation Restoration To Soil Quality On Weibei Loess Plateau

Loess plateau area land resource is rich but the ecological environment is frail. In order to use and protect the land resource reasonably, prevent soil erosion and soil degenerates, our country has already carried on "three north" forest protective engineering and large-scale conservation of soil and water, and planted trees and grass. Yongshou Maliantan forestry centre is one of the proper priority construct region in loess plateau area. Through many years afforestation, the local coverage of surface vegetation degree had distinct enhancement, and effectively controlled the soil erosion, and the ecological environment had gradually improvement, at the same time, the vegetation's restoration reconstruction has also promoted the soil growth, improved the soil character and the soil quality. This research through in the open country inspection and the room analyze, from the embryology point, analyze the influence and the function by serious degeneration ecosystem vegetation restores to the soil quality, and appraised soil effect by differently restores measure, provide theory basis and technical support for the west ecological environment construction. Main conclusion as follows:1. The soil basic chemical property change in vegetation recovery procedure:â‘ The restored vegetation can enhance the soil ulmin and the nitrogen content: Generally: acacia forest > grassplot > the legumina trees > the non- legumina trees (the mixed forest > center of young growth >infield > giving up cultivation. Generally the surface is high and dropping suddenly in 20 - 40cm, tending to stably in 40 - 100cm; The potassium element increasing is small, the phosphorus element does not have obviously change.â‘¡Soil exchange performance and acidity and alkalescence: The surface soil layer CEC comparatively high, the growth forest and natural pasture soil CEC is the biggest, next bush forest land, the mixed forest and center young tree forest land, giving up cultivation is the lowest; Growth forest nearly does not have the lime respond, the CaCO3 content is very few; all kinds of different use pH variation is very small.2. The soil texture and mineral substance element change in vegetation recovery procedure:â‘ The soil texture: Research area major belongs to the sandy clay; The soil clay content: grown-up acacia forest > the grown-up oil pine > bush and lawn > mixed forest > center...