Journal of Geographical Sciences ›› 2014, Vol. 24 ›› Issue (6): 963-979.doi: 10.1007/s11442-014-1131-1
• Research Articles • Previous Articles Next Articles
Ran CAO1,2(), Weiguo JIANG1,2(
), Lihua YUAN1,2, Wenjie WANG3, Zhongliang LV4, Zheng CHEN1,2
Received:
2014-05-30
Accepted:
2014-07-10
Online:
2014-06-20
Published:
2014-06-20
About author:
Author: Cao Ran (1990-), Graduate Student, specialized in ecological remote sensing and natural hazard and risk analysis. E-mail:
Supported by:
Ran CAO, Weiguo JIANG, Lihua YUAN, Wenjie WANG, Zhongliang LV, Zheng CHEN. Inter-annual variations in vegetation and their response to climatic factors in the upper catchments of the Yellow River from 2000 to 2010[J].Journal of Geographical Sciences, 2014, 24(6): 963-979.
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Table 1
Classification of coefficient of variation and corresponding proportions of area in the Long-Liu Basin"
CV | Volatility level | Area (%) |
---|---|---|
0.015-0.095 | Lowest fluctuation | 19.90 |
0.095-0.109 | Lower fluctuation | 20.63 |
0.109-0.189 | Moderate fluctuation | 53.86 |
0.189-0.650 | Higher fluctuation | 4.08 |
0.650-3.317 | Highest fluctuation | 1.53 |
Table 2
Classification of Theil-Sen median slope analysis and Mann-Kendall test and corresponding area proportions in the Long-Liu Basin"
SNDVI | Z | Trend level | Area (%) |
---|---|---|---|
<0 | < -1.96 | Significant decreasing | 1.89 |
<0 | -1.96 to 1.96 | Insignificant decreasing | 17.15 |
≥0 | -1.96 to 1.96 | Insignificant increasing | 36.90 |
≥0 | ≥1.96 | Significant increasing | 44.06 |
Table 3
Classification of coefficient of variation, Theil-Sen median slope analysis, the Mann-Kendall test and the corresponding area proportions in the Long-Liu bain"
CV | SNDVI | Z | Variation type | Area (%) |
---|---|---|---|---|
0.015 to 0.189 | <0 | < -1.96 | Relatively stable and significantly decreasing | 0.95 |
0.189 to 3.317 | <0 | < -1.96 | Highly fluctuating and significantly decreasing | 0.63 |
0.015 to 0.189 | >0 | >1.96 | Relatively stable and significantly increasing | 42.14 |
0.189 to 3.317 | >0 | >1.96 | Highly fluctuating and significantly increasing | 1.76 |
- | - | -1.96 to 1.96 | Insignificant trend | 54.52 |
Table 4
Classification of correlation of NDVI with precipitation and corresponding area proportion in the Long-Liu Basin"
rp | Correlation level | Area (%) |
---|---|---|
-0.99 to -0.735 | Highly significant and negative correlation** | 0.78 |
-0.735 to -0.602 | Significant and negative correlation* | 2.13 |
-0.602 to 0 | Insignificant and negative correlation | 30.64 |
0 to 0.602 | Insignificant and positive correlation | 54.11 |
0.602 to 0.735 | Significant and positive correlation* | 8.36 |
0.735 to 0.99 | Highly significant and positive correlation** | 3.98 |
Table 5
Classification of correlation of NDVI with temperature and corresponding area proportion in the Long-Liu Basin"
rt | Correlation level | Area (%) |
---|---|---|
-0.99 to -0.735 | Highly significant and negative correlation** | 0.16 |
-0.735 to -0.602 | Significant and negative correlation* | 0.71 |
-0.602 to 0 | Insignificant and negative correlation | 21.75 |
0 to 0.602 | Insignificant and positive correlation | 60.56 |
0.602 to 0.735 | Significant and positive correlation* | 10.9 |
0.735 to 0.99 | Highly significant and positive correlation** | 5.92 |
Table 6
Classification of correlation of NDVI with precipitation and temperature and corresponding area proportions in the Long-Liu Basin"
R | Correlation type | Area (%) |
---|---|---|
|rp|≥0.602 | Significant correlation of NDVI with precipitation* | 8.96 |
|rt|≥0.602 | Significant correlation of NDVI with temperature* | 11.21 |
|rp|≥0.602 and |rt|≥0.602 | Significant correlation of NDVI with precipitation and temperature* | 4.25 |
|rp|≤0.602 or |rt|≤0.602 | Insignificant correlation | 75.59 |
Figure 9
Proportion of correlation types in variation types in the Long-Liu Basin. Note: SD = vegetation with relatively stable and significantly decreasing trend; FD = vegetation with a highly fluctuating and significant decreasing trend; SI = vegetation with relatively stable and significantly increasing trend; FI = vegetation with highly fluctuating and significant increasing trend; P = precipitation; T=temperature; Insig. = insignificant correlation"
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