The Spatiotemporal Variation of Tree Cover in the Loess Plateau of China after the ‘Grain for Green’ Project
Abstract
:1. Introduction
2. Study Areas and Data
2.1. Study Area
2.2. Data
2.2.1. Tree Cover Data
2.2.2. Other Data
3. Methods
3.1. Temporal Variation in the Tree Cover
3.2. Spatial Variation in the Tree Cover
3.3. Trend Analysis
3.4. Hurst Exponent
4. Results
4.1. Temporal Variation of the Tree Cover in the Loess Plateau
4.2. Spatial Variation of the Tree Cover in the Loess Plateau
4.3. Variation in Trends of Tree Cover Change
4.4. The Sustainability of the Tree Cover Variation
5. Discussion
5.1. Temporal Variation of the Tree Cover in the Loess Plateau
5.2. Spatial Variation of Tree Cover Change in the Loess Plateau
5.3. Uncertainty
6. Conclusions
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Trend of Tree Cover | Area Percentage (%) | Slope | Z Value | p Value |
---|---|---|---|---|
Significant increase | 34.53 | ≥0.1 | >1.96 | ≤0.05 |
Slight increase | 23.63 | 0.0005–0.1 | –1.96–1.96 | >0.05 |
Stability | 36.21 | –0.0005–0.0005 | –1.96–1.96 | >0.05 |
Slight decrease | 4.78 | –0.1–0.0005 | –1.96–1.96 | >0.05 |
Significant decrease | 0.85 | ≤–0.1 | <−1.96 | ≤0.05 |
Variation Types | Area Percentage (%) | Slope | Z Value | H |
---|---|---|---|---|
Sustained Significant increase | 16.31 | ≥0.1 | >1.96 | >0.5 |
Sustained Slight increase | 10.05 | 0.0005–0.1 | –1.96–1.96 | >0.5 |
Sustained Stability | 8.52 | –0.0005–0.0005 | –1.96–1.96 | >0.5 |
Sustained Slight decrease | 2.00 | –0.1–0.0005 | –1.96–1.96 | >0.5 |
Sustained Significant decrease | 0.39 | ≤–0.1 | <−1.96 | >0.5 |
Undetermined future trend | 38.08 | - | - | ≤0.5 |
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Wang, Y.; Kang, M.; Zhao, M.; Xing, K.; Wang, G.; Xue, F. The Spatiotemporal Variation of Tree Cover in the Loess Plateau of China after the ‘Grain for Green’ Project. Sustainability 2017, 9, 739. https://doi.org/10.3390/su9050739
Wang Y, Kang M, Zhao M, Xing K, Wang G, Xue F. The Spatiotemporal Variation of Tree Cover in the Loess Plateau of China after the ‘Grain for Green’ Project. Sustainability. 2017; 9(5):739. https://doi.org/10.3390/su9050739
Chicago/Turabian StyleWang, Yuhang, Muyi Kang, Mingfei Zhao, Kaixiong Xing, Guoyi Wang, and Feng Xue. 2017. "The Spatiotemporal Variation of Tree Cover in the Loess Plateau of China after the ‘Grain for Green’ Project" Sustainability 9, no. 5: 739. https://doi.org/10.3390/su9050739