干旱胁迫下冬小麦产量结构与生长、生理、光谱指标的关系  

Relationship between indices of growth,physiology and reflectivity and yield of winter wheat under water stress

作　　者：丛建鸥[1] 李宁[2] 许映军[1] 顾卫[1,3] 乐章燕[1] 黄树青[1] 席宾[1] 雷飏[2] 

机构地区：[1]北京师范大学地表过程与资源生态国家重点实验室,北京100875 [2]民政部教育部减灾与应急管理研究院,北京100875 [3]北京师范大学环境演变与自然灾害教育部重点实验室,北京100875

出　　处：《中国生态农业学报》2010年第1期67-71,共5页Chinese Journal of Eco-Agriculture

基　　金：国家自然科学基金项目（40771008）; 国家“十一五”科技支撑计划项目（2006BAD20B01）; 国家高技术研究发展计划（863计划）项目（2006AA100206）资助

摘　　要：通过控制生育期水分条件形成不同程度的干旱胁迫,对冬小麦生长、产量及生理指标和冠层高光谱反射率对干旱胁迫的反应进行监测,建立冬小麦减产率与生长、生理及冠层光谱反射率的相关模型。研究结果表明：不同生育期冬小麦干物质积累速度随水分胁迫程度的增大而减小;叶绿素含量与水分条件的关系不同于其他参数,表现为中等水分条件下叶绿素含量最大,严重水分胁迫下叶绿素含量最低;不同水分条件下光合速率呈两种不同日变化特征,且正常供水处理的光合速率明显高于严重干旱处理。光合速率和增强植被指数（EVI）同冬小麦减产率相关性较强,能够建立较好的关系模型用于小麦产量预测。In this study,the correlation between yield reduction rate and the relevant key performance indicators of growth,physiology and canopy hyperspectral reflectivity of winter wheat are established at different drought levels via soil water content control at different growth stages.The results show that dry-matter accumulation rate decreases with increasing drought stress at different growth stages.The correlation between chlorophyll content and soil water condition differs from that for the other parameters.Chlorophyll content is maximum in moderate drought stress and minimum in severe drought stress.Daily variation in photosynthetic rate exhibits two different characteristics,with a higher photosynthetic rate under normal soil water condition than in serious drought stress.Furthermore,an optimal relational model formulated from yield reduction rate with photosynthetic rate and enhanced vegetation index （EVI） can be used to estimate winter wheat yield.

关 键 词：干旱胁迫 冬小麦 光谱反射率 减产率 关系模型 

分 类 号：S152.75[农业科学—土壤学]