Effects of Drought on Vegetation Productivity of Farmland Ecosystems in the Drylands of Northern China
Abstract
:1. Introduction
2. Materials and Methods
2.1. Study Area
2.2. Data Sources
2.3. Methodology
2.3.1. Self-Calibrated Palmer Drought Severity Index
2.3.2. Enhanced Vegetation Index
2.3.3. EVI and scPDSI Anomalies
2.3.4. Statistical Analysis
2.3.5. Time-Lag Effect Analyses
3. Results
3.1. Drought and EVI Trends in Farmland Ecosystems in the DNC
3.2. Response to Drought in EVI of Farmland Ecosystems in the DNC
3.2.1. Time-Lag Effects Between EVI and Drought
3.2.2. Response to Drought in EVI of Farmland Ecosystems in the DNC
3.3. The Differences in the Impact of Drought on EVI Among Irrigated Farmland, Rainfed Farmland and Natural Vegetation
4. Discussion
4.1. The Causes of Differences in the Impact of Drought on Vegetation Productivity
4.2. Study Implications
4.3. Study Limitations
5. Conclusions
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Region | Area of Irrigated Farmland (km2) | Area of Rainfed Farmland (km2) | Proportion of Irrigated Farmland | Proportion of Rainfed Farmland |
---|---|---|---|---|
Arid drylands | 66,036.25 | 77,754.96 | 45.93% | 54.07% |
Semi-arid drylands | 72,462.00 | 268,030.08 | 21.28% | 78.72% |
DNC | 138,498.25 | 345,785.04 | 28.60% | 71.40% |
Drought Category | scPDSI Value |
---|---|
Extremely wet | >4 |
Severely wet | 3~4 |
Moderately wet | 2~3 |
Slightly wet | 1~2 |
Incipient wet spell | 0.5~1 |
Near normal | −0.5~0.5 |
Incipient dry spell | −1~−0.5 |
Slightly dry | −2~−1 |
Moderately dry | −3~−2 |
Severely dry | −4~−3 |
Extremely dry | <−4 |
Region | DNC | Arid Drylands | Semi-Arid Drylands | |
---|---|---|---|---|
Correlation | Irrigated farmland (Ic) | 0.628 | 0.534 | 0.669 |
Rainfed farmland (Rc) | 0.761 | 0.661 | 0.781 | |
Natural vegetation (Vc) | 0.659 | 0.740 | 0.542 | |
Linear fitting slope (/10−3) | Irrigated farmland (Is) | 2.991 | 1.970 | 4.165 |
Rainfed farmland (Rs) | 7.414 | 4.219 | 8.657 | |
Natural vegetation (Vs) | 3.738 | 2.809 | 4.780 | |
(Rs-Is)/Rs | 59.66% | 53.29% | 51.89% | |
(Vs-Is)/Vs | 19.98% | 29.85% | 12.87% | |
(Rs-Vs)/Rs | 49.59% | 33.41% | 44.78% |
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Zhu, X.; Liu, Y.; Xu, K.; Pan, Y. Effects of Drought on Vegetation Productivity of Farmland Ecosystems in the Drylands of Northern China. Remote Sens. 2021, 13, 1179. https://doi.org/10.3390/rs13061179
Zhu X, Liu Y, Xu K, Pan Y. Effects of Drought on Vegetation Productivity of Farmland Ecosystems in the Drylands of Northern China. Remote Sensing. 2021; 13(6):1179. https://doi.org/10.3390/rs13061179
Chicago/Turabian StyleZhu, **ufang, Ying Liu, Kun Xu, and Yaozhong Pan. 2021. "Effects of Drought on Vegetation Productivity of Farmland Ecosystems in the Drylands of Northern China" Remote Sensing 13, no. 6: 1179. https://doi.org/10.3390/rs13061179