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An analysis of land use changes and driving forces of Dajiuhu wetland in Shennongjia based on high resolution remote sensing images: Constraints from the multi-source and long-term remote sensing information |
HU Suliyang1,2,3(), LI Hui1,2(), GU Yansheng4,5, HUANG Xianyu1,2, ZHANG Zhiqi6, WANG Yingchun6 |
1. China University of Geosciences(Wuhan), School of Geography and Information Engineering, Wuhan 430074, China 2. China University of Geosciences(Wuhan),Hubei Key Laboratory of Critical Zone Evolution, Wuhan 430074, China 3. Geological Surveying and Mapping Institute, Kunming 650000, China 4. State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China 5. Hubei Key Laboratory of Wetland Evolution and Eco-Restoration(WEER), China University of Geosciences, Wuhan 430074, China 6. Shennongjia National Park Management Bureau, Shennongjia 442421, China |
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Abstract Dajiu lake wetland is a rare subtropical alpine wetland in Central China. The wetland has experienced several periods of large-scale development since the founding of the People’s Republic of China, which has led to the serious destruction of the wetland. The “Dajiu Lake wetland protection and restoration and park construction project” implemented in 2005 has made the wetland function recovered to a certain extent. To understand the land use changes in Dajiuhu wetland, the authors identified nine land use types of Dajiu lake wetland based on field investigation and previous work. The high-resolution remote sensing images acquired in 2005, 2011 and 2017 and UAV images in 2018 were used to visually interpret the land use types. The dynamic change and type conversion of land use in three periods were examined and the driving forces were explored. The results show that, from 2005 to 2011, new lakes (84.41 hm2) were added, and the most decreased area was farmland, which mainly transformed into xerophytic meadow and wet herbaceous swamp. From 2011 to 2017, a new type of mesophytic meadow (80.07 hm2) was added, which was mainly transformed from wet peat swamp, wet herbaceous swamp and xerophytic meadow. Most of the reduction was in farmland, which was mainly converted to xerophytic meadow. In a word, during the research period, the wetland types and areas of Dajiu Lake were increasing, the wetland landscape was restored to a certain extent, and the wetland ecological environment was improved. The analysis of driving forces shows that the establishment of Wetland Nature Reserve and a series of effective wetland ecological restoration projects are the main driving forces of land use change in Dajiu Lake wetland. The results of this study can provide reference and suggestions for wetland restoration and protection.
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Keywords
Shennongjia Dajiu Lake
high resolution remote sensing image
land use
wetland
driving forces
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Fund:CUGCJ1806 |
Corresponding Authors:
LI Hui
E-mail: jacobxiaosu@foxmail.com;leelmars@gmail.com
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Issue Date: 18 March 2021
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