Research Article
Spatiotemporal Variations of Drought in the Arid Region of Northwestern China during 1950–2012
Table 4
Sen + M-K test for the changes in the SPI, SPEI, and SC-PDSI in each subregion.
| Subregion | Drought index | β | |Zc| | Trend |
| I | SPI | 0.013 > 0 | >1.96 | ↑ | SPEI | 0.012 > 0 | >1.96 | ↑ | SC-PDSI | 0.031 > 0 | >1.96 | ↑ |
| II | SPI | 0.012 > 0 | >1.96 | ↑ | SPEI | 0.012 > 0 | >1.96 | ↑ | SC-PDSI | 0.026 > 0 | >1.96 | ↑ |
| III | SPI | 0.009 > 0 | >1.96 | ↑ | SPEI | 0.009 > 0 | >1.96 | ↑ | SC-PDSI | 0.022 > 0 | >1.96 | ↑ |
| | SPI | 0.011 > 0 | >1.96 | ↑ | IV | SPEI | 0.013 > 0 | >1.96 | ↑ | SC-PDSI | 0.033 > 0 | >1.96 | ↑ |
| | SPI | −0.001 < 0 | ≤1.96 | ↓ | V | SPEI | −0.001 < 0 | ≤1.96 | ↓ | SC-PDSI | 0.009 > 0 | ≤1.96 | ↑ |
| | SPI | −0.007 < 0 | ≤1.96 | ↓ | VI | SPEI | −0.003 < 0 | ≤1.96 | ↓ | SC-PDSI | −0.005 < 0 | ≤1.96 | ↓ |
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