| Drought evolution characteristics and risk zoning of spring maize in Hedong of Gansu Province |
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| DOI：10.7606/j.issn.1000-7601.2019.06.34 |
| Key Words: spring maize crop water deficit anomaly index spatial and temporal changes of drought the risk zoning of drought disaster loss Hedong in Gansu Province |
| Author Name | Affiliation | | WEI Kun | Geographical and Environmental Sciences, Department of Northwest Normal University，Lanzhou, Gansu 730070，China | | ZHANG Bo | Geographical and Environmental Sciences, Department of Northwest Normal University，Lanzhou, Gansu 730070，China | | MA Shangqian | Geographical and Environmental Sciences, Department of Northwest Normal University，Lanzhou, Gansu 730070，China | | WU Qianhui | Geographical and Environmental Sciences, Department of Northwest Normal University，Lanzhou, Gansu 730070，China | | CUI Yanqiang | Geographical and Environmental Sciences, Department of Northwest Normal University，Lanzhou, Gansu 730070，China |
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| Abstract: |
| Hedong is a main production area of spring maize in Gansu Province, and also an area prone to drought. In this paper, based on the Penman-Montith model recommended by FAO and the crop coefficient provided, we calculated the crop water deficit anomaly index (CWDIa) of Hedong. After studying the daily meteorological data from 54 weather stations and the production data of spring maize from 1961 to 2017 in the east of Gansu and based on the trend of the inter-annual variability of drought, drought in spatial distribution, and drought damage risk zoning, the drought evolution characteristics and damage risk zoning were analyzed in the growth period of spring maize in recent 57 years in the Hedong. The results showed that due to precipitation, the water requirement in every ten days and CWDIa of spring maize in Hedong firstly increased then decreased.This area is a rain-fed agricultural area, but high CWDIavalues (>15) showed that it needed irrigation to meet the water requirement of spring maize in growing season.The spring maize water deficit during growth period ranged as:tasseling stage to flowering stage> jointing stage> milk stage to mature stage > emergence stage to seven leaf stage.The degree of drought in emergence stage to seven leaf stage decreased from the south to north and the degree of other stages increased from the south to north.The drought risk of spring maize in Hedong region had significant difference among regions. The low-risk regions were mainly in southern Longdong, central Longnan, northern and southern Longnan, and northeastern Gannan Plateau regions. The middle risk areas were the central region of Longdong, the southeastern region of Longnan, and the central region of Loess Plateau of Longxi. The main risk areas were mainly Huanxian,Weibei. The high risk area mainly distributed in south region of the Yellow River to Jingyuan-Yuzhong. In general, the risk zoning of drought damage to spring maize in the Hedong area distributed latitudinally from the south to north. Affected by accumulated temperature, [JP3]the mountain area above 2 500 m elevation in Hedong is not suitable for spring maize cultivation. |
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