Welcome to Journal of Agriculture,

Journal of Agriculture ›› 2024, Vol. 14 ›› Issue (4): 83-92.doi: 10.11923/j.issn.2095-4050.cjas2023-0134

Previous Articles     Next Articles

Climate Change in Shiyang River Basin and Its Influence on Vegetation Index

WANG Heling1(), DING Wenkui1,2, LI Xingyu2, YANG Xiaoling2(), GUO Limei2, ZHANG Jinxiu2   

  1. 1 Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province/ Key Open Laboratory of Arid Climatic Change and Disaster Reduction of China Meteorological Administration (CMA)/ Institute of Arid Meteorology, CMA, Lanzhou 730020, Gansu, China
    2 Wuwei National Climate Observation Platform of Gansu Province, Wuwei 733099, Gansu, China
  • Received:2023-05-31 Revised:2023-11-22 Online:2024-04-17 Published:2024-04-17

Abstract:

The influence of climate change on vegetation cover is important for ecological environment protection in arid areas. Based on data of monthly temperatures, precipitation, sunshine, evaporation and NASA GIMMS normalized difference vegetation index (NDVI) of Shiyang River Basin from 2000 to 2020, annual and seasonal variations trend of temperature, precipitation, sunshine hours, evaporation and NDVI were analyzed by using linear trend method, then effect of climate elements change on NDVI change were studied by correlation coefficient method. The results showed that annual temperature showed a clear upward trend in Shiyang River Basin and various regions. Temperature in spring, summer and autumn showed an upward trend, and it showed a downward trend in winter (except Minqin). Annual precipitation in total catchment area and Yongchang, Gulang and Tianzhu showed an increasing trend, while Minqin and Liangzhou showed a decreasing trend. Change trend of precipitation in each season was not consistent. Annual sunshine duration showed a decreasing trend in total catchment area and other places except Gulang, and variation trend of sunshine duration in each season was very inconsistent. Annual evaporation showed an increasing trend in total catchment area and other places except Liangzhou, and variation trend of evaporation in each season was not consistent. Annual NDVI in Shiyang River Basin and various regions showed a significant growth trend. Each season NDVI also showed an increasing trend except Liangzhou in spring. Annual and seasonal temperature and precipitation were basically positively correlated with NDVI, and temperature and precipitation had a positive contribution to NDVI. Correlation between sunshine duration, evaporation and NDVI of annual and seasonal was quite different. In general, sunshine duration had a negative contribution to NDVI, and evaporation had a positive contribution to NDVI. Research results will provide scientific reference for improving utilization rate of climate resources, adjusting planting structure and improving ecological environment in Shiyang River Basin.

Key words: climate change, NDVI, correlation, Shiyang River Basin