Drought and flood characteristics in the farming- pastoral ecotone of northern China based on the Standardized Precipitation Index

doi:10.1007/s40333-021-0111-4

Journal of Arid Land

2021, Vol. 13

Issue (12): 1244-1259 DOI: 10.1007/s40333-021-0111-4 CSTR: 32276.14.s40333-021-0111-4

Original article

Drought and flood characteristics in the farming- pastoral ecotone of northern China based on the Standardized Precipitation Index

CAO Huicong¹^,²^,^*(

), YAN Dandan³, JU Yuelin²

¹Journal Department, Nanjing Forestry University, Nanjing 210037, China
²Faculty of Humanities & Social Sciences, Nanjing Forestry University, Nanjing 210037, China
³College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, China

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Abstract

The farming-pastoral ecotone of northern China (FPENC) provides an important ecological barrier which restrains the invasion of desert into Northwest China. Studying drought and flood characteristics in the FPENC can provide scientific support and practical basis for the protection of the FPENC. Based on monthly precipitation data from 115 meteorological stations, we determined the changes in climate and the temporal and spatial variations of drought and flood occurrence in the FPENC during 1960-2020 using the Standardized Precipitation Index (SPI), Morlet wavelet transform, and inverse distance weighted interpolation method. Annual precipitation in the FPENC showed a slightly increasing trend from 1960 to 2020, with an increasing rate of about 1.15 mm/a. The interannual SPI exhibited obvious fluctuations, showing an overall non-significant upward trend (increasing rate of 0.02/a). Therefore, the study area showed a wetting trend in recent years. Drought and flood disasters mainly occurred on an interannual change cycle of 2-6 and 9-17 a, respectively. In the future, a tendency towards drought can be expected in the FPENC. The temporal and spatial distribution of drought and flood differed in the northwestern, northern, and northeastern segments of the FPENC, and most of the drought and flood disasters occurred in local areas. Severe and extreme drought disasters were concentrated in the northwestern and northeastern segments, and severe and extreme flood disasters were mainly in the northeastern segment. Drought was most frequent in the northwestern segment, the central part of the northeastern segment, and the northern part of the northern segment. Flood was most frequent in the western part of the northwestern segment, the eastern part of the northeastern segment, and the eastern and western parts of the northern segment. The accurate evaluation of the degrees of drought and flood disasters in the FPENC will provide scientific basis for the regional climate study and critical information on which to base decisions regarding environmental protection and socio-economic development in this region.

Key words： farming-pastoral ecotone of northern China (FPENC) Standardized Precipitation Index (SPI) drought flood Morlet wavelet transform

Received: 18 August 2021 Published: 10 December 2021

Corresponding Authors: *CAO Huicong (E-mail: caohuicong@njfu.edu.cn)

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Cite this article:

CAO Huicong, YAN Dandan, JU Yuelin. Drought and flood characteristics in the farming- pastoral ecotone of northern China based on the Standardized Precipitation Index. Journal of Arid Land, 2021, 13(12): 1244-1259.

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http://jal.xjegi.com/10.1007/s40333-021-0111-4 OR http://jal.xjegi.com/Y2021/V13/I12/1244

Fig. 1 Overview of the farming-pastoral ecotone of northern China (FPENC). The dotted line divides the FPENC into three parts: northwestern segment, northern segment, and northeastern segment.

Table 1 Classiﬁcation standard of drought and flood grades based on the Standardized Precipitation Index (SPI)

Fig. 2 Annual precipitation change in the farming-pastoral ecotone of northern China (FPENC) from 1960 to 2020

Fig. 3 Standardized Precipitation Index (SPI) values with time-scales of 3-months (SPI-3; a) and 12-months (SPI-12; b) in the FPENC from 1960 to 2020

Fig. 4 Isolines of the real part of the Morlet wavelet coefficients (a) and the wavelet variance for the SPI-12 (b) in the FPENC from 1960 to 2020

Fig. 5 Change of the drought (or flood) station rate in the FPENC from 1960 to 2020

Table 2 Statistics of drought and flood at different spatial scales in the farming-pastoral ecotone of northern China (FPENC) from 1960 to 2020

Fig. 6 Spatial distribution characteristics of drought and flood grades in the FPENC in 1960 (a), 1970 (b), 1980 (c), 1990 (d), 2000 (e), 2010 (f), and 2020 (g)

Fig. 7 Spatial distribution of drought (a-e) and flood (f-j) frequency in the FPENC


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