Title: The change of the forestland ecological environment with engineering erosion in Caoyuan Yong'an
Abstract: Taking the forestland without engineering erosion as the control,this paper analyzes the change of the forestland ecological environment with engineering erosion in Caoyuan Yong'an.The results show that the forestland vegetation is totally destroyed after engineering erosion.The average weight of the dispersed rocks left on the slope is 3 528.73 g·m-2.These rocks have sharp edges and corners,and the long-term friction accelerate the erosion of the slope.The denudation thickness of the soil with engineering erosion is 15~30 cm.The soil humus totally or mostly is eroded by the ways of suspending and drifting.The soil cementation ability decreases while the dispersion rate increases.Compared with the control,the water steady aggregate particles with the diameter 0.25 cm reduces 18.03% and 16.87% in the 0~20 cm and 20~40 cm layer,respectively,and the destroyed rate of the soil structure particles increase 21.87% and 20.2% in the 0~20 cm and 20~40 cm layer,respectively.The nutrient content,water-holding capacity and permeability decrease obviously.The soil degrades with crust and causes soil fertility descends 1~3 units.The soil furface runoff increases,which accelerates the soil erosion,leading to the difficulty in ecological recovery,so the effective methods should be worked out for the ecological recovery.
Publication Year: 2008
Publication Date: 2008-01-01
Language: en
Type: article
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