Journal of Resources and Ecology ›› 2020, Vol. 11 ›› Issue (3): 304-314.DOI: 10.5814/j.issn.1674-764X.2020.03.008
• Ecosystem Responses to Climate Change • Previous Articles Next Articles
WANG Xiangtao1,2, ZHANG Xianzhou1,2,3, WANG Junhao1,2, NIU Ben1,2,*()
Received:
2020-01-09
Accepted:
2020-03-17
Online:
2020-05-30
Published:
2020-06-16
Contact:
NIU Ben
About author:
WANG Xiangtao, E-mail: wangxt.16b@igsnrr.ac.cn
Supported by:
WANG Xiangtao, ZHANG Xianzhou, WANG Junhao, NIU Ben. Variations in the Drought Severity Index in Response to Climate Change on the Tibetan Plateau[J]. Journal of Resources and Ecology, 2020, 11(3): 304-314.
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URL: http://www.jorae.cn/EN/10.5814/j.issn.1674-764X.2020.03.008
Fig. 1 Linear trends for (a) Ta, average annual air temperature; (b) MAT, maximum air temperature; (c) MIT, minimum air temperature; (d) EMAT, extreme maximum air temperature; (e) EMIT, extreme minimum air temperature; (f) TP, total precipitation; (g) MAP, maximum precipitation; (h) Ea, average vapor pressure; (i) RH, average relative humidity; (j) MIRH, minimum relative humidity; (k) VPD, average vapor pressure deficit; (l) SP, percentage of sunshine; (m) SH, sunshine hours; and (n) WS, average wind speed; from 2000 to 2011 based on data from 69 meteorological stations on the Tibetan Plateau.
Fig. 4 Relationships of the linear trend of the annual drought severity index (Slope_DSI) with climate variables on the Tibetan Plateau. (a) average annual temperature (Ta); (b) maximum annual temperature (MAT); (c) minimum annual temperature (MIT); (d) extreme maximum annual temperature (EMAT); (e) extreme minimum annual temperature (EMIT); (f) annual precipitation (TP); (g) maximum annual precipitation (MAP); (h) average annual vapor pressure (Ea); (i) annual sunshine percentage (SP); (j) annual sunshine hours (SH); and (k) average annual wind speed (WS).
Fig. 5 Relationships between the linear trend of the annual drought severity index (Slope_DSI) and the linear trends of several climate factors: (a) maximum annual temperature (Slope_MAT); (b) extreme maximum annual temperature (Slope_EMAT); (c) extreme minimum annual temperature (Slope_EMIT); (d) annual precipitation (Slope_TP); (e) annual sunshine percentage (Slope_SP); and (f) annual sunshine hours (Slope_SH).
Fig. 6 Annual trends for (a) Ta, average air temperature; (b) MAT, maximum air temperature; (c) MIT, minimum air temperature; (d) EMAT, extreme maximum air temperature; (e) EMIT, extreme minimum air temperature; (f) WS, average wind speed; from 2000 to 2011 at 69 meteorological stations on the Tibetan Plateau.
Types | Ta | MAT | MIT | EMAT | EMIT | TP | MAP | Ea | RH | MIRH | VPD | SP | SH | WS |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Alpine meadows | -0.11 | -0.42 | 0.26 | -0.43 | -0.08 | 0.59* | 0.20 | 0.67* | 0.50 | 0.71** | -0.35 | -0.85*** | -0.87*** | 0.49 |
Alpine steppes | 0.28 | -0.07 | 0.58* | -0.36 | 0.20 | 0.70* | 0.19 | 0.07 | -0.17 | -0.35 | 0.23 | -0.74** | -0.74** | 0.19 |
Temperate steppes | 0.20 | 0.10 | 0.25 | 0.04 | 0.57 | 0.42 | -0.19 | 0.29 | -0.16 | 0.07 | 0.34 | -0.23 | -0.19 | 0.18 |
Croplands | -0.34 | -0.48 | -0.14 | -0.55 | -0.05 | 0.43 | -0.22 | 0.36 | 0.50 | 0.26 | -0.49 | -0.90*** | -0.91*** | 0.26 |
Forests | -0.71** | -0.77** | -0.73** | -0.63* | -0.69* | 0.54 | 0.24 | 0.74** | 0.78** | -0.04 | -0.76** | -0.66* | -0.65* | -0.02 |
Shrublands | -0.66* | -0.78** | -0.51 | -0.61* | -0.36 | 0.66* | -0.43 | 0.69* | 0.75** | 0.83*** | -0.73** | -0.75** | -0.75** | 0.03 |
All types | -0.28 | -0.49 | -0.03 | -0.40 | -0.11 | 0.61* | -0.18 | 0.54 | 0.50 | 0.74** | -0.42 | -0.86*** | -0.86*** | 0.31 |
Table 1 Correlation coefficients for spatially averaged annual drought severity index (DSI) with spatially averaged climate factors from 2000 to 2011 at 69 meteorological stations on the Tibetan Plateau
Types | Ta | MAT | MIT | EMAT | EMIT | TP | MAP | Ea | RH | MIRH | VPD | SP | SH | WS |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Alpine meadows | -0.11 | -0.42 | 0.26 | -0.43 | -0.08 | 0.59* | 0.20 | 0.67* | 0.50 | 0.71** | -0.35 | -0.85*** | -0.87*** | 0.49 |
Alpine steppes | 0.28 | -0.07 | 0.58* | -0.36 | 0.20 | 0.70* | 0.19 | 0.07 | -0.17 | -0.35 | 0.23 | -0.74** | -0.74** | 0.19 |
Temperate steppes | 0.20 | 0.10 | 0.25 | 0.04 | 0.57 | 0.42 | -0.19 | 0.29 | -0.16 | 0.07 | 0.34 | -0.23 | -0.19 | 0.18 |
Croplands | -0.34 | -0.48 | -0.14 | -0.55 | -0.05 | 0.43 | -0.22 | 0.36 | 0.50 | 0.26 | -0.49 | -0.90*** | -0.91*** | 0.26 |
Forests | -0.71** | -0.77** | -0.73** | -0.63* | -0.69* | 0.54 | 0.24 | 0.74** | 0.78** | -0.04 | -0.76** | -0.66* | -0.65* | -0.02 |
Shrublands | -0.66* | -0.78** | -0.51 | -0.61* | -0.36 | 0.66* | -0.43 | 0.69* | 0.75** | 0.83*** | -0.73** | -0.75** | -0.75** | 0.03 |
All types | -0.28 | -0.49 | -0.03 | -0.40 | -0.11 | 0.61* | -0.18 | 0.54 | 0.50 | 0.74** | -0.42 | -0.86*** | -0.86*** | 0.31 |
Fig. 7 Annual trends for (a) TP, total precipitation; (b) MAP, maximum precipitation; (c) Ea, average vapor pressure; (d) RH, average relative humidity; (e) MIRH, minimum relative humidity; (f) VPD, average vapor pressure deficit; from 2000 to 2011 at 69 meteorological stations on the Tibetan Plateau.
Fig. 8 Annual trends for (a) SP, percentage of sunshine; (b) SH, sunshine hours; from 2000 to 2011 at 69 meteorological stations on the Tibetan Plateau.
Fig. 9 Correlation coefficients of the drought severity index (DSI) with: (a) Ta, average air temperature; (b) MAT, maximum air temperature; (c) MIT, minimum air temperature; (d) EMAT, extreme maximum air temperature; (e) EMIT, extreme minimum air temperature; (f) WS, average wind speed; from 2000 to 2011 at 69 meteorological stations on the Tibetan Plateau.
Fig. 10 Correlation coefficients of the drought severity index (DSI) with: (a) TP, total precipitation; (b) MAP, maximum precipitation; (c) Ea, average vapor pressure; (d) RH, average relative humidity; (e) MIRH, minimum relative humidity; (f) VPD, average vapor pressure deficit; from 2000 to 2011 at 69 meteorological stations on the Tibetan Plateau.
Fig. 11 Correlation coefficients of the drought severity index (DSI) with annual: (a) SP, percentage of sunshine; (b) SH, sunshine hours; from 2000 to 2011 at 69 meteorological stations on the Tibetan Plateau.
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