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Trends and Continuity Analysis of Vegetation Change in Huangshui River Basin from 2000 to 2019 |
Rui Wang1( ),Dezhen Bai1,Fang Yin2,Lei Liu3( ) |
1.Qinghai Research and Design institute of Environmental Sciences,Xining 810000,China 2.School of Land Engineering,Chang’an University,Xi’an 710054,China 3.School of Earth Sciences and Resources,Chang’an University,Xi’an 710054,China |
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Abstract Vegetation change characteristics are the important contents of watershed ecological monitoring and the most critical information for environmental protection. In this study, MODIS EVI data products and Hurst index were used to analyze the temporal and spatial variation trend of vegetation in Huangshui River Basin from 2000 to 2019 and its continuity analysis. Combined with the meteorological observation data of temperature and precipitation, this paper analyzed the influencing factors of vegetation change in 9 counties and districts in Huangshui River Basin. The results show that from 2000 to 2019, the maximum annual EVI increase of vegetation in the Huangshui River Basin is 0.0063, and different counties and districts in the upper, middle and lower reaches show different change characteristics under the influence of temperature, precipitation, land use and other factors. For the annual EVI maximum, the increasing trend of the downstream is the most significant, and the change intensity of the river channel area is more obvious. Based on Hurst index analysis, the trend has a certain continuity in the short term. This study revealed the importance of vegetation monitoring trends in the plateau watershed by monitoring the temporal changes of vegetation, and provided a certain data support and scientific basis for watershed management and sustainable development.
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Received: 07 April 2021
Published: 15 February 2023
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Corresponding Authors:
Lei Liu
E-mail: 474799945@qq.com;liul@chd.edu.cn
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