水胁迫下典型盐生植被梭梭光谱特征分析  

Analysis of the Spectral Characteristics of Haloxylon Ammodendron under Water Stress

作　　者：邓来飞 张飞 张海威[1,2,3] 张贤龙[1,2,3] 袁婕 DENG Lai-fei;ZHANG Fei;ZHANG Hai-wei;ZHANG Xian-long;YUAN Jie(Key Laboratory of Smart City and Environmental Modeling of Higher Education Institute,College of Resources and Environment Sciences,Xinjiang University,Urumqi 830046,China;Key Laboratory of Oasis Ecology,Xinjiang University,Urumqi 830046,China;Engineering Research Center of Central Asia Geoinformation Development and Utilization,National Administration of Surveying,Mapping and Geoinformation,Urumqi 830002,China)

机构地区：[1]新疆大学资源与环境科学学院智慧城市与环境建模自治区普通高校重点实验室,新疆乌鲁木齐830046 [2]新疆大学绿洲生态教育部重点实验室,新疆乌鲁木齐830046 [3]中亚地理信息开发利用国家测绘地理信息局工程技术研究中心,新疆乌鲁木齐830002

出　　处：《光谱学与光谱分析》2019年第1期210-215,共6页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(新疆联合基金本地优秀青年人才培养专项)(U1503302);自治区科技人才培养项目("万人计划"后备人选培养项目)(QN2016JQ0041);新疆维吾尔自治区天山英才项目(400070010209)资助

摘　　要：荒漠地区由于气候干燥,降水稀少,水分常成为制约植被生长的因素之一,水分胁迫对植物长势和产量的影响比任何其他胁迫都要大。随着高光谱技术的发展,国内外已有众多学者利用高光谱数据研究植被遭受胁迫作用,然而这些研究对象多集中于甜菜、棉花、玉米、水稻等作物,针对干旱区盐生植被遭受胁迫作用的研究较少。梭梭作为荒漠、半荒漠地区的典型盐生植被之一,具有极高的经济和生态效益。选择梭梭作为研究对象,培育一年生梭梭,并设置三个水分梯度,形成受不同水分量胁迫的梭梭。使用原始光谱、红边位置参数,结合植被指数及二维相关光谱研究其叶片光谱特征,为干旱区利用高光谱遥感监测盐生植被提供借鉴。结果表明:(1)分析梭梭叶片反射光谱曲线发现,在可见光至中红外各波段范围内,受不同水分量胁迫作用的梭梭叶片光谱反射率有显著差异。在可见光(350～610nm)波段,各水分处理的梭梭叶片反射率依次为100mL>500mL>200mL,这是由于100和200mL水分促进梭梭内部叶绿素合成,使该波段反射率降低,而过多的水分(500mL)对梭梭内部的叶绿素合成没有更大的促进作用。在红光区(611～738nm),随着水分量的增多,受不同水分量胁迫的梭梭叶片光谱反射率依次减小。在738～1 181和1 228～1 296nm波段,受不同水分量胁迫作用的梭梭叶片光谱反射率为:200mL>100mL>500mL;在1 182～1 227nm波段,受不同水分量胁迫作用的梭梭叶片光谱反射率为:100mL>200mL>500mL。这是由于植被细胞结构对近红外区域的反射率影响较大,因而受不同水分胁迫作用的梭梭叶片光谱反射率有显著差异。在1 300～1 365和1 392～1 800nm波段,受各水分胁迫作用的梭梭叶片反射率为:100mL>200mL>500mL。这表明在500mL水分胁迫量范围内,水分越多,叶子的细胞液、细胞膜对水分的吸收能力越强,使得反射率下降。通过对原Due to the dry climate and scarce precipitation in desert areas,water content is one of the factors that restrict the growth of vegetation.The stress factors include ozone stress,salt stress,and water stress involving terrestrial and aquatic plants.Water stress has a greater effect on plant growth and yield than any other stress.Along with the development of hyperspectral remote sensing technology,there have been many scholars at home and abroad who have been using hyperspectral data to study the effects of stress on vegetation.However,these research objects mainly focused on beet,cotton,corn,rice and other crops.There are few studies on the stress of saline vegetation in arid areas.Haloxylon is one of the typical halophytic vegetation in desert and semi-desert area,which is also known as Haloxylon ammodendron.It belongs to Chenopodiaceae,shrub or small tree,widely distributed in the desert and semi-desert regions.The plants’s root is well developed.It has a great effect on breaking wind and fixing sands and has the characteristics of salinity tolerance,drought resistance and so on,which has extremely high ecological value and economic value.In this paper,we selected the Haloxylon ammodendron as the research object.We developed the annual Haloxylon ammodendron,and set three water gradients,forming the plant with different water stress.The spectral characteristics of leaves were studied by using the original spectra,the red-edge position,combined with vegetation index and two-dimensional correlation spectra.This provides reference for using hyperspectral remote sensing to monitor saline vegetation in arid area.The results showed that:(1)By analyzing the leave reflectance of Haloxylon ammodendron under different water treatnment,we have found that:with in the range of visible to mid-infrared bands,Haloxylon ammodendron’s leaf spectral reflectance of different water stress was significantly different.In the visible region(350~610 nm),the leaf reflectance of Haloxylon ammodendron under various water stress was 10

关 键 词：梭梭 水分胁迫 红边位置 二维相关光谱 光谱指数 

分 类 号：S718.3[农业科学—林学]