The Response of NDVI to Drought at Different Temporal Scales in the Yellow River Basin from 2003 to 2020
Abstract
:1. Introduction
2. Materials and Methods
2.1. Study Area
2.2. Method and Materials
2.2.1. Data Source
2.2.2. Linear Trend Method
2.2.3. Correlation Analysis
3. Results
3.1. Spatio-Temporal Distribution Characteristics of SPEI
3.2. Spatial and Temporal Distribution Characteristics of NDVI
3.3. The Response of NDVI to SPEI
4. Discussion
4.1. The Impact Mechanism of SPEI on NDVI
4.2. Response of NDVI to SPEI
4.3. Uncertainty and Vegetation Management Recommendations
5. Conclusions
Funding
Data Availability Statement
Conflicts of Interest
References
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Drought Grade | SPEI Value |
---|---|
Extreme drought | SPEI ≤ −2.00 |
Severe drought | −2 < SPE I ≤ −1.5 |
Moderate drought | −1.5 < SPEI ≤ −1 |
Mild drought | −1 < SPEI ≤ −0.5 |
Normal | SPEI ≥ −0.5 |
Level of CC | CC |
---|---|
High positive correlation | 0.8 ≤ CC < 1.0 |
Strong positive correlation | 0.6 ≤ CC < 0.8 |
Moderate positive correlation | 0.4 ≤ CC < 0.6 |
Weak positive correlation | 0.2 ≤ CC < 0.4 |
No correlation | −0.2 < CC < 0.2 |
Weak negative correlation | −0.4 < CC ≤ −0.2 |
Moderate negative correlation | −0.6 < CC ≤ −0.4 |
Strong negative correlation | −0.8 < CC ≤ −0.6 |
High negative correlation | −1 < CC ≤ −0.8 |
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Liu, W. The Response of NDVI to Drought at Different Temporal Scales in the Yellow River Basin from 2003 to 2020. Water 2024, 16, 2416. https://doi.org/10.3390/w16172416
Liu W. The Response of NDVI to Drought at Different Temporal Scales in the Yellow River Basin from 2003 to 2020. Water. 2024; 16(17):2416. https://doi.org/10.3390/w16172416
Chicago/Turabian StyleLiu, Wen. 2024. "The Response of NDVI to Drought at Different Temporal Scales in the Yellow River Basin from 2003 to 2020" Water 16, no. 17: 2416. https://doi.org/10.3390/w16172416