叶片水分含量光谱响应变化研究  

Research on spectral changes with water losing of leaves

作　　者：王树东[1] 刘素红[1] 丁建丽[2] 唐义闵[1] 李向[1] 

机构地区：[1]北京师范大学地理学与遥感科学学院RS与GIS研究中心遥感科学国家重点实验室北京市环境与数字城市重点实验室,北京100875 [2]新疆大学理论经济学博士后流动站,新疆乌鲁木齐830046

出　　处：《干旱区地理》2006年第4期510-516,共7页Arid Land Geography

基　　金：国家自然科学基金资助项目(40471094);国家863项目(2002AA130010);国家重点基础研究发展规划项目(G20000779);中国科学院西部之光项目(CAS200313);自治区高校科研计划项目(XJEDU2004S03;XJEDU2005I07);新疆大学博士启动基金项目(BS050108)资助

摘　　要：植被光谱反射或发射特性是化学和形态学特征决定的,这种特性与植被发育、健康状态、含水量、叶绿素含量密切相关,植物的水分胁迫状况能够在光谱反射率数据中有所体现。本文通过实验研究野外活体植物叶片和采集下的叶片随着水分流失波谱曲线变化的规律,并发现随不同的叶片水分损失率,红边、与红边相关的参数及波形呈现不同的变化。The conclusions that the degree of water stress can be detected by spectral characteristics have gained by many researchers. However, the study was inadequate, such as whether or not the spectral characteristics changes follow the same rules when the leaves separated from the living plant specimen and the water losing in different degrees？ The conclusions to this question were interesting and significant to breakage of plants, vegetation irrigation in drought and military blind distinguish. Therefore, we design experimentations to observe kinds of plants in different water stress conditions. The garden plot of Beijing Normal University was picked as our experimental ground. Random sample was chosen and many kinds of plants leaves were selected. We use the LI - 1800 External Integr0ating Sphere together with ASD, in addition an electronic balance which precision of one in a thousand was taken to weight leaves. To simulate the diversification of water stress, the roaster which thermostatic range between 50- 200 degrees centigrade was utilized. We randomly selected healthy living leaves both new and adult to measure their spectrums when they are in trunk. It is measurable and calculated to wait for the leaves water losing in natural conditions which mean normal temperature and no artificially intervention; When their water losing speed are slow, other plan is firing leaves using roaster. Through the study of displacements of red edge position and spectral curves changes, we got the conclusion that not all kinds of leaves losing water conform to the same disciplines about spectral characteristics changes, especially, red edge and its related parameters variety in reason of concentration of water, chlorophyll and characteristics of epidermal layer of leaf, and location of red edge of various leaves shows characteristics of to - and - fro changes, but the change trend of which is also different. The fresh and fully grown leaves are also compared, and the fresh ones changes more acutely. But the research on spectral c

关 键 词：光谱分析 水分胁迫 叶片波谱 红边及相关参数 波形变化 

分 类 号：Q946.915[生物学—植物学]