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Geoscience ›› 2023, Vol. 37 ›› Issue (04): 881-891.DOI: 10.19657/j.geoscience.1000-8527.2023.028

• Water Resources and Environmental Geology • Previous Articles     Next Articles

Vegetation Dynamics and Driving Factors in Zhangjiakou-Chengde Area of Hebei Province from 2001 to 2020

WANG Qian1(), JIN Xiaomei1(), ZHANG Xucai1, YIN Xiulan2, JIN Aifang2, LUO Xufu1   

  1. 1. School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, China
    2. China Institute of Geological Environment Monitoring, Beijing 100081, China
  • Received:2022-06-09 Revised:2023-03-15 Online:2023-08-10 Published:2023-09-02

Abstract:

As a water conservation function area in the Beijing-Tianjin-Hebei region, the vegetation dynamics of Zhangjiakou-Chengde (Zhang-Cheng) area is of great significance for the ecological/environmental construction and protection. Based on MODIS-NDVI, temperature and precipitation, land use, groundwater depth and measured soil moisture data, Sen+Mann-Kendall trend analysis, partial correlation analysis and other methods, we analyze the spatial-temporal variation characteristics of vegetation and the response characteristics of temperature and precipitation, land use, groundwater depth and soil moisture in Zhang-Cheng area from 2001 to 2020. The results show that the annual mean NDVI value shows an upward fluctuation trend. The vegetation coverage is characterized by being low in the northwest and high in the southeast. Significant vegetation improvement areas were mainly distributed across most of Baxia, accounting for 85.79% of the study area. There are positive correlations between precipitation, temperature, and the vegetation index. Furthermore, the vegetation variation agrees well with the land-use change. The vegetation growth is best when the groundwater depth is around 6.2 m. The spatial distribution of soil moisture is low at Bashang and high at Baxia. The NDVI increases with increasing measured soil moisture.

Key words: MODIS-NDVI, land-use, soil moisture, correlation relationship, Zhangjiakou-Chengde area

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