Resources Science ›› 2021, Vol. 43 ›› Issue (4): 849-858.doi: 10.18402/resci.2021.04.18

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Spatiotemporal change of fractional vegetation cover in the Yellow River Basin during 2000-2019

ZHANG Zhiqiang1, LIU Huan2, ZUO Qiting3,4, YU Jintao1,5, LI Yang6   

  1. 1. College of Surveying and Geo-Informatics, North China University of Water Resources and Electric Power, Zhengzhou 450046, China
    2. State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, China
    3. School of Water Conservancy Science & Engineering, Zhengzhou University, Zhengzhou 450001, China;
    4. Yellow River Institute for Ecological Protection & Regional Coordinated Development, Zhengzhou University, Zhengzhou 450001, China;
    5. School of Information Science and Engineering, Shandong Agricultural University, Taian 271018, China
    6. Center of Construction Management & Quality Safety Supervision, Ministry of Water Resources, Beijing 100038, China;
  • Received:2020-03-27 Revised:2020-10-09 Online:2021-04-25 Published:2021-06-25

Abstract:

A scientific understanding of the spatiotemporal change of the fractional vegetation cover (FVC) in the Yellow River Basin (YRB) is of great significance for understanding the change of ecological environment quality and controlling soil erosion comprehensively. In this study, the MOD13Q1 data product and precipitation data from national meteorological stations during 2000-2019 were used to investigate the spatial pattern, temporal change, and future tendency of FVC in the YRB based on dimidiate pixel mode, simple linear regression model, and Hurst index. The results show that: (1) The FVC of the YRB shows an obvious rising tendency during 2000-2019, with a growth rate of 0.0603/10 a. Inter-monthly variation of the FVC presents a change process of increasing first and then decreasing, and the FVC reaches its peak (0.672) in August. (2) Spatially, the vegetational cover in the middle part of the YRB improved significantly during 2000-2019, while that in the northwest and west remained relatively low. (3) The FVC presents a step-like increase from northwest to southeast, and Henan Province has the best vegetation coverage among the nine provinces in the YRB. (4) Precipitation is a decisive factor in determining the spatial distribution of the FVC, but it has little influence on the inter-annual change of the FVC, and the influence degree on the middle reaches of the YRB is obviously greater than on the upper reaches. (5) Vegetational cover in the YRB will develop well, and the area with rising tendency of vegetation coverage accounts for 64.51% of the YRB. The research results provide some data support and scientific guidance for the formulation of ecological protection programs in the YRB.

Key words: Yellow River Basin (YRB), fractional vegetation cover (FVC), MODIS-NDVI, dimidiate pixel mode, simple linear regression model, Hurst index