Response of NDVI and SIF to Meteorological Drought in the Yellow River Basin from 2001 to 2020

Abstract

Understanding the response of vegetation to drought is of great significance to the biodiversity protection of terrestrial ecosystem. Based on the MOD13A2 NDVI, GOSIF, and SPEI data of the Yellow River Basin from 2001 to 2020, this paper used the methods of Theil–Sen median trend analysis, Mann–Kendall significance test, and Pearson correlation analysis to analyze whether the vegetation change trends monitored by MODIS and GOSIF are consistent and their sensitivity to meteorological drought. The results showed that NDVI and SIF increased significantly (p −2 and 0.345 × 10−2, respectively. The significant improvement area of SIF (66.49%, p p 0, p p < 0.01). The results indicate that SIF is more responsive to drought than NDVI. Analyzing the response of vegetation to meteorological drought can provide constructive reference for ecological protection.

Keywords

• NDVI
• SIF
• meteorological drought
• correlation analysis
• Yellow River Basin