Study on spatiotemporal characteristics of atmospheric drought from 1981 to 2020 in the Mu Us Sandy Land of China based on SPEI index

doi:10.7522/j.issn.1000-694X.2022.00002

Journal of Desert Research ›› 2022, Vol. 42 ›› Issue (4): 71-80.DOI: 10.7522/j.issn.1000-694X.2022.00002

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Study on spatiotemporal characteristics of atmospheric drought from 1981 to 2020 in the Mu Us Sandy Land of China based on SPEI index

Honglin Lian¹(), Xueying Han¹, Yali Liu², Yuqing Han², Wenbin Yang², Wei Xiong²()

^1.College of Desert Control Science and Engineering，Inner Mongolia Agricultural University，Hohhot 010019，China
^2.Institute of Ecological Protection and Restoration/Institute of Desertification Studies，Chinese Academy of Forestry，Beijing 100091，China

Received:2021-12-14 Revised:2022-01-12 Online:2022-07-20 Published:2022-08-29
Contact: Wei Xiong

Abstract

Abstract:

Atmospheric drought is an important factor affecting vegetation construction， ecological restoration and social-economically sustainable development in the semi-arid sand areas. To understand the spatiotemporal characteristics of drought events in the Mu Us Sandy Land during the past 40 years， this paper estimated the standardized precipitation evapotvanspiration index （SPEI） at monthly， seasonal and annual scales， based on the monthly meteorological data from 1981 to 2020. The results showed that：（1） The average annual precipitation （351.61 mm） and the temperature （8.49 ℃） in nearly 40a both showed a significant upward trend （P<0.05）. Seasonal precipitation increased throughout the four seasons， of which precipitation showed a significant upward trend in autumn and winter （P<0.05）. The average temperature in all four seasons showed a significant upward trend （P<0.05）. （2） Based on the SPEI index， it generally showed an insignificant wetting trend in the Mu Us Sandy Land （P>0.05） and a significant wetting trend in autumn （P<0.05）. Meanwhile， it showed a trend of wetting both in the central and western regions， while it showed a drying trend in the eastern region of the Mu Us Sandy Land. （3） In the past 40 years， the total drought frequency in Mu Us Sandy Land reached 31.9%. The order of the drought frequency was following as： light drought>moderate drought>severe drought>very severe drought； and the drought frequency had an order of winter>summer， autumn>spring. The light drought mainly occurred in the north， central， southeast and southwest regions； the middle drought occurred mainly in the eastern， northern and western edges regions； the severe drought mainly occurred in the eastern， central and southern regions； while the very severe drought events mainly occurred in the northwest， south and southeast regions of Mu Us Sandy Land. These results will contribute to the water resources planning， ecological restoration， disaster prevention and mitigation in the Mu Us Sandy Land.

Key words: Mu Us Sandy Land, standardized precipitation evapotranspiration index, spatiotemporal characteristics, drought frequency

CLC Number:

P467

Honglin Lian, Xueying Han, Yali Liu, Yuqing Han, Wenbin Yang, Wei Xiong. Study on spatiotemporal characteristics of atmospheric drought from 1981 to 2020 in the Mu Us Sandy Land of China based on SPEI index[J]. Journal of Desert Research, 2022, 42(4): 71-80.

Figures/Tables 10

Fig.1 Distribution of meteorological stations in the Mu Us Sandy Land

Table 1 The classification of drought grade based on SPEI

干旱等级	干旱类型	SPEI数值范围
1	无旱	SPEI>-0.5
2	轻旱	-1.0<SPEI≤-0.5
3	中旱	-1.5<SPEI≤-1.0
4	重旱	-2.0<SPEI≤-1.5
5	特旱	SPEI≤-2.0

Fig.2 The trends of the changes in the annual precipitation and the annual temperature in the Mu Us Sandy Land from 1981 to 2020

Fig.3 The trends of the changes of precipitation and temperature in spring， summer，autumn， winter in the Mu Us Sandy Land from 1981 to 2020

Fig.4 Interannual variation of mean SPEI index and M-K mutation test in the Mu Us Sandy Land from 1981 to 2020

Fig.5 Seasonal changes of the mean SPEI index and M-K mutation test in the Mu Us Sandy Land from 1981 to 2020

Fig.6 Drought incidence and drought frequency in the Mu Us Sandy Land in the nearly 40 years

Fig.7 Spatial distribution of the tendency rate of annual SPEI in the Mu Us Sandy Land in the nearly 40 years

Fig.8 Spatial distribution of tendency rate of seasonal SPEI in the Mu Us Sandy Land in the nearly 40 years

Fig.9 Spatial variation of drought frequencies in the Mu Us Sandy Land in the nearly 40 years

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Study on spatiotemporal characteristics of atmospheric drought from 1981 to 2020 in the Mu Us Sandy Land of China based on SPEI index

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