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[1]WANG Huimin,ZHU Zhongyuan.Drought and Moist Changes and Their Relations with Temperature in Xilin River Basin from 1981 to 2016[J].Research of Soil and Water Conservation,2019,26(01):178-183,191.

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Drought and Moist Changes and Their Relations with Temperature in Xilin River Basin from 1981 to 2016

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 26 Number of periods: 2019 01 Page number: 178-183,191 Column: Public date: 2019-02-28

Title:: Drought and Moist Changes and Their Relations with Temperature in Xilin River Basin from 1981 to 2016

Author(s):: WANG Huimin, ZHU Zhongyuan; Water Conservancy and Civil Engineering College, Inner Mongolia Agricultural University, Hohhot 010018, China

Keywords:: drought and moist event; SPI; trend variations; relation Xilin River Basin

CLC:: P426.61⁺4

DOI:: -

Abstract:: In order to find out the drought and moist changes over the years in the Xilin River Basin, using the monthly data of precipitation and temperature in the Xilin River Basin for a total of 36 years from 1981 to 2016, we analyzed the temporal variation of precipitation and temperature in 36 years on annual and seasonal scales. The standardized precipitation indexes at different temporal scales (SPI1, SPI3, SPI6, SPI12) for each month were calculated. The correlation between temperature and SPI, the sensitivity of SPI at different time scales, and the inter-annual variation of drought and moist events were analyzed. According to the monthly SPI sequence, the year-by-year sequence of different months was separated during the growth period of pasture to analyze the changes of SPI during the growth period. The results showed that:(1) the overall change trend of annual precipitation over the years was extremely inconspicuous with uneven distribution of precipitation during the year, precipitation in summer accounted for more than half of the total precipitation; the inter-annual temperature change was more significant and presented the upward trend; (2) with the increase of tempoal scale, the rising trend of SPI series weakened, the frequency of fluctuation decreased, and the start and end times of drought and flood were delayed; in terms of frequency of occurrence of drought and moist events at each level, severe and moderate drought and moist events showed significant inter annual changes, while mild drought and moist events occurred every year with no significant inter annual changes; (3) during the growth period, the SPI sequence showed the upward trend in May, June and October, while it showed the downward trend in July, August and September. It showed that it was more humid at the end of spring and early summer, it was generally dry in the summer, and it showed the trend of shift from wetness to drought in the fall; (4) the drought and moist events were positively correlated with temperature in May and December, and negatively correlated with temperature in the other months, the significant negative correlation between the drought and moist events and temperature was found in January, June, July, August and November.

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