A preliminary study on vegetation-erosion dynamics and its applications |
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| Authors: | Email author" target="_blank">Zhaoyin?WangEmail author Guangqian?Wang Changzhi?Li Feixin?Wang |
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| Institution: | 1. Department of Hydraulic Engineering, Tsinghua University, Beijing 100084, China;International Research and Training Center on Erosion and Sedimentation, Beijing 100084, China
2. Department of Hydraulic Engineering, Tsinghua University, Beijing 100084, China |
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| Abstract: | Vegetation-erosion dynamics is a new interdisciplinary science, studying the laws of evolution of watershed vegetation under the action of various ecological stresses. Introducing a qualitative expression of ecological stresses in this paper, the present authors establish the cou- pled differential equations for the vegetation-erosion process and derive a theoretical solution. The model is applied to the Anjiagou watershed on the Loess Pateau and the Xiaojiang water- shed and its sub-watersheds on the Yunnan Plateau. The calculated results agree well with the vegetation development processes. Abstracted from the differential equations the so-called vegetation-erosion chart is worked out, with which we can predict the development trend of vegetation under no human stresses. It is demonstrated that the erosion control is important for vegetation development and reforestation must be a long-term strategy. On the Yunnan Plateau with relatively high precipitation and temperature, vegetation can be greatly improved if erosion is controlled. On the dry and cold Loess Pateau suffering from high rate of soil erosion, however, vegetation can effectively control erosion but erosion reduction exhibits low effectiveness on vegetation development. Vegetation in the area is not stable and management is always needed to maintain the vegetation. |
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| Keywords: | vegetation-erosion dynamics human activities coupled differential equations erosion control vigor of vegetation |
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