OALib Journal期刊
ISSN: 2333-9721
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基于EPIC模型的黄淮海夏玉米旱灾风险评价
DOI: 10.11821/xb201105007, PP. 643-652
Keywords: 脆弱性曲线,风险评价,旱灾,玉米产量,EPIC模型,黄淮海夏播玉米区
Abstract:
玉米是中国最主要的粮食作物之一,因其较高的需水量,受气候影响,极易遭受旱灾。因此,以黄淮海夏播玉米区为例,从风险的角度进行玉米旱灾评价,对于农业旱灾预警和保障国家粮食安全具有重要的现实和指导意义。在全面收集研究区气象、土壤、土地利用、农气观测等资料的基础上,基于农业旱灾风险评价的概念框架“致灾因子危险性H评价(Hazard)—承灾体脆弱性曲线Vc评价(VulnerabilityCurve)—作物减产风险性R评价(Risk)”,引入基于物理过程的作物模型EPIC(ErosionProductivityImpactCalulator),采用作物模型模拟和数字制图等技术,分别从全生育期和分生育期角度,对黄淮海夏播玉米区玉米旱灾风险的时空分布进行了定量评价。结果表明在2、5、10和20年一遇致灾水平下,黄淮海夏播玉米区玉米旱灾减产风险总体呈现出从西北向东南方向递减的趋势,这主要由气候环境和下垫面的地形地貌条件所决定。20年一遇水平时,产量损失风险的高值区(R≥0.5)集中分布在冀北高原山地和山东省中南部地区,占黄淮海夏播玉米区玉米总面积的7.63%。黄淮海夏播玉米区成灾风险较高的生育期拔节期—抽雄期、抽雄期—乳熟期、乳熟期—成熟期应加强防范。研究可为高风险区和高风险时段的玉米旱灾风险防范提供理论依据和科技支撑。
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