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| Analysis on the dynamics of the vegetation coverage and the drivers in Taihu Basin via NDVI |
| QIU Kuanbiao1,2, ZHANG Yugang2, WANG Tongshun3 |
1. Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, 210042, Nanjing, China;
2. Soil and Water Conservation Monitoring Center of Taihu Basin, Taihu Basin Authority, 200434, Shanghai, China;
3. Jiangsu Academy of Hydraulic Research, 210017, Nanjing, China |
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Abstract [Background] Vegetation is one of the main factors controlling the soil erosion, which can prevent the rainfall splash erosion, improve the soil quality, enhance the erosion durability of soil and decrease the sediment-carrying capacity of surface runoff. Researches on long-term vegetation changes have been conducted in many basins, including Yangtze River Basin, Yellow River Basin, Haihe River Basin, Huai River Basin, Pearl River Basin and Songliao River Basin. However, it is still lack of studies on the spatio-temporal distribution of vegetation in Taihu Basin.[Methods] In this study, we analyzed the changes of the vegetation coverage and their drivers in Taihu Basin at three scales including the whole Taihu Basin, the sub-basins of Taihu Sub-basin and Southeastern-rivers Sub-basin, and some key spots such as the land forms and the regions along the rivers, using normalized difference vegetation index (NDVI) obtained from MOD13 data products and the climatic data of the weather stations. Linear regression models were applied into analyzing the tendency of annual NDVI, and correlation analysis was applied into quantifying the relationship between NDVI and the climatic factors.[Results] 1) There was no significant trend for the annual NDVI in Taihu Basin (P=0.13). But NDVI trend were both significant for the sub-basin. NDVI decreased in Taihu Sub-basin with a rate of-0.004/a (P<0.01), while increased in the Southeastern Rivers Sub-basin with a rate of 0.002/a (P<0.01). 2) In both Taihu Sub-basin and Southeastern Rivers Sub-basin, a decreasing tendency was found in plain, platform and hilly area, while the increasing was found in the mountainous regions. 3) The tendency of the annual NDVI was more obvious in the region distant from water bodies, rather than that closed to water bodies. In the Southeastern Rivers Sub-basin, the increasing trend of NDVI along the distance from water bodies was much stronger than that in Taihu Sub-basin. 4) Climate did not serve as the main factors regulating the NDVI changes except in some mountainous regions where the terrain limited the accessibility of human beings. Contrary to the role of climate, the policies on the afforestation, the increasing population and the urban expansion were the main factors affecting NDVI changes in Taihu Basin.[Conclusions] The results provide a technique reference for soil and water conservation and ecological construction in Taihu Basin. Urban soil and water conservation and supervision of construction projects should be executed in Taihu Sub-basin, while supervision of construction projects, clean small watershed construction and returning farmland to forests should be paid emphasis on in Southeastern Rivers Sub-basin.
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Received: 21 August 2018
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