Response of Agricultural Drought to Meteorological Drought - A case study of the Winter Wheat Above the Bengbu Sluice in the Huaihe River Basin, China

Gao, Chao, Chen, Cai, He, Yi, Ruan, Tian and Sun, Yanwei (2020) Response of Agricultural Drought to Meteorological Drought - A case study of the Winter Wheat Above the Bengbu Sluice in the Huaihe River Basin, China. Water, 12. ISSN 2073-4441

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Abstract

In this study, we investigate the winter wheat in response to occurring droughts for the region above the Bengbu Sluice in the Huaihe River from 1961-2015 based on the daily scale dataset of 60 meteorological stations. Crop water deficit index (CWDI) and relative moisture index (M) are used to examine the winter wheat drought and meteorological drought, respectively. We then analyze the spatial-temporal evolution characteristics of these two kinds of drought calculate the time lag of winter wheat drought to meteorological drought, and finally discuss the relationship between the time lag of winter wheat drought to meteorological drought and underlying surface geographical factors, and drew some conclusions: 1) In terms of time scale, for CWDI, except for the filling and mature period, the CWDI at other growth periods showed a slight downward trend; For M, there was no significant change in the interannual trend of each growth period. In terms of spatial scale, the proportion of above moderate drought level in each station of CWDI and M presented a decreasing feature from north to south. 2) The time lag of winter wheat drought to meteorological drought was the shortest (3.21d) in the greening and heading period and the longest at over-wintering period (84.35d). 3) The correlation between the geographical factors and the time lag of winter wheat drought in each growth period was better than 0.5. The high value points of the relation between the underlying surface geographical factors and the time lag of winter wheat drought were mostly distributed in the mountainous areas with poor soil field capacity, high elevation and steep slope, the areas with aspect to the east and northeast, and the northern areas with less precipitation and lower temperature.

Item Type: Article
Uncontrolled Keywords: winter wheat drought,meteorological drought,time lag,geographical factors,above the bengbu sluice in the huaihe river
Faculty \ School: Faculty of Science > School of Environmental Sciences
Depositing User: LivePure Connector
Date Deposited: 13 Oct 2020 00:04
Last Modified: 21 Oct 2020 23:55
URI: https://ueaeprints.uea.ac.uk/id/eprint/77213
DOI: 10.3390/w12102805

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