CollectHomepage AdvertisementContact usMessage

Arid Land Geography ›› 2025, Vol. 48 ›› Issue (2): 296-307.doi: 10.12118/j.issn.1000-6060.2024.300

• Ecology and Environment • Previous Articles     Next Articles

Evolutionary characteristics of NDVI in the Kashi Delta and its response to the climate

ZHANG Haidong(), LI Chongbo(), MENG Liqi, Adilai SAITINIYAZI, JU Xifeng   

  1. Urumqi Comprehensive Survey Center on Natural Resources, China Geological Survey, Urumqi 830057, Xinjiang, China
  • Received:2024-05-15 Revised:2024-08-30 Online:2025-02-25 Published:2025-02-25
  • Contact: LI Chongbo E-mail:zhanghaidong@mail.cgs.gov.cn;lichongbo01@126.com

Abstract:

The impact of climatic factors on vegetation growth was examined using MODIS vegetation index data, monthly average temperature, and precipitation data for the period 2000—2020. Linear trend analysis, Pearson correlation analysis, and partial correlation analysis were applied to study the temporal and spatial variations in normalized difference vegetation index (NDVI) across different seasons and its response to mean temperature and precipitation in the Kashi Delta of Xinjiang, China. The findings revealed the following trends: (1) NDVI in the study area showed a highly significant upward trend, with significant increases in the affected area during the growing season, spring, summer, and autumn, at 79.8%, 71.2%, 72.1%, and 91.3%, respectively. (2) Overall, NDVI showed no significant response to mean temperature and precipitation, though precipitation had a dominant influence on NDVI. Seasonal and spatial variations were observed. During the growing season, NDVI was negatively correlated with temperature and positively correlated with precipitation. In spring and summer, NDVI was positively correlated with both temperature and precipitation, while in autumn, it was negatively correlated with both. (3) The time-lag response of temperature to NDVI was mainly negative, whereas precipitation showed a mainly positive lag effect on NDVI. This suggests that increasing temperatures inhibit vegetation growth, while increased precipitation promotes it. Precipitation has a stronger lag effect on NDVI than temperature. These findings provide valuable insights for future analysis of ecological evolution in arid regions and can guide ecological protection and restoration efforts.

Key words: NDVI, spatio and temporal variation, climate factors, Kashi Delta