Study On Soil Structure And Water Conservation Characteristics Of Typical Forest Vegetations In Water Boundaries Of Municipal Water Source

This article regards water boundaries of municipal water source -Huangqian district as studying area, six kinds of typical forest vegetation-the sunny side of the mixed forest of Pinus tabulaeformis and Acer mono Maxim, the shade side of the mixed forest of Pinus tabulaeformis and Acer mono Maxim, Quercus acutissima, Castanea mollissima, Platycladus orientalis in the area as the research object( in contrast to grassland), mainly discusses soil structure, physical character of soil, soil infiltration, dynamical Changes of soil water, and announced the variability of the vegetation type soil physical structure and soil hydrology physical property of different forest, providing theoretics bases and technique supporting for the choice of forest and the combination of forest structure in the construction of water boundaries of municipal water source .The results are follows:(1)By analyzing two indexes of particle-size distributions-Cu and Cs , and two indexes of Soil aggregate evaluation-MWD and FD,the result shows:â‘ The soil structure of forest was better than grassland, and among forests, the soil structure of the mixed forest of Pinus tabulaeformis and Acer mono Maxim is better than Quercus acutissima, Castanea mollissima,Platycladus orientalis. A good forest structure could improve the even degree and range of distribution obviously, and improve the porosity. The soil structure of mixed Forest with needle and broad leaves is the best.â‘¡The FD of the mixed forest of Pinus tabulaeformis and Acer mono Maxim is lower than Quercus acutissima, Castanea mollissima, Platycladus orientalis and grassland, while its mean weight diameter (MWD) is higher than Quercus acutissima, Castanea mollissima, Platycladus orientalis and grassland, which explains that the mixed forest with needle and broad leaves have better soil structure and soil permeability.