考虑水分胁迫后效应的作物水模型  

Model of crop response to water with influence of after-effect of water stress

作　　者：郭相平[1] 朱成立[1] 

机构地区：[1]河海大学现代农业工程系,江苏南京210098

出　　处：《水科学进展》2004年第4期463-466,共4页Advances in Water Science

基　　金：国家自然科学基金资助项目(50309003);国家"九五"科技攻关项目(96 006 02 02)~~

摘　　要：水分胁迫具有后效应,前期水分胁迫可以影响作物后期叶面积和需水量的增减。以Jensen作物 水模型为基础,引入了水分胁迫后效应影响系数,对原模型进行了修正。修正后的模型可以将阶段水分胁迫与前期胁迫后效应对产量的影响加以区分,避免了原模型中可能产生的虚缺水现象,并可对作物(以玉米为例)前期水分胁迫处理后,后期需水量增加以及苗期胁迫处理可维持较高产量的原因进行合理解释。通过田间试验结果分析,改进后模型的模拟结果符合实际,并具有较好的精度。对模型存在的问题和不足也进行了探讨。Water stress has after-effect which would affect water requirement of crop in different growing stages. The field experiment indicated that the after-effects caused by stress in earlier stages might result in decrease(or increase) of crop leaf area index(LAI) and water requirement. A correction coefficient of after-effect of water stress expressed as variation of relative leaf area index is introduced to improve the present Jenson model of crop response to water(MCRW).The improved model can separate the effects of water stress from after-effect of water stress on grain yield and thus avoid the appearance of 'false water (deficit'.) It can also explain reasonablely why water requirement increase in later growth when water stress is exposed in earlier stage and why relative high grain yield can be maintained under some stress treatment. The simulated results fit well in with the farm data with fairly high accuracy, indicting the model being reasonable. Disadvantages of the model are also discussed in the paper.

关 键 词：水分胁迫 后效应 作物-水模型 

分 类 号：S152.7[农业科学—土壤学]