基于两层土壤计算模式的农业干旱风险评估模型  

Model of risk assessment for agricultural drought based on two-layer soil computing model

作　　者：陈晓楠[1,2] 段春青[3] 刘昌明[3] 曹玉升[2] 

机构地区：[1]中国水利水电科学研究院,北京100038 [2]南水北调中线干线工程建设管理局,北京100038 [3]北京师范大学水科学研究院,北京100875

出　　处：《农业工程学报》2009年第9期51-55,共5页Transactions of the Chinese Society of Agricultural Engineering

基　　金：中国水利水电科学研究院开放基金研究项目

摘　　要：在分析总结当前农业干旱评估模型的基础上,利用"土壤-作物-大气连续体"理论,建立起水分运动的两层土壤计算模式,对作物蒸散量的变化规律进行描述。在此基础上,从作物受旱程度和产量损失关系出发,借助作物水分生产函数,并综合考虑各作物的权重,建立起农业干旱风险评估的静态、动态模型。实例表明,这些模型与传统模型相比,不仅适用于未来各种时间尺度下的干旱程度风险评估,而且能够提供出产量损失的信息,有较高的推广应用价值。Current assessment models for agricultural drought were discussed by this paper.Calculation model of water movement based on two-layer soil was established to describe the regulations of crop evapotranspiration variation,taking advantage of the theory of ＂soil-crop-atmosphere continuum＂.On basis of the model,risk assessment static and dynamic models for agricultural drought were proposed by crop water production function,considering weight of each crop.Results showed that models could be used to evaluate uncertainly drought extent in any time scale in future, and provide information of production loss. It is significant to spread the risk assessment models.

关 键 词：农业 干旱 风险评估 蒸散量 作物水分生产函数 

分 类 号：S274.1[农业科学—农业水土工程]