拉萨河中游高寒草地植被群落光谱特征的研究  

Research on spectral characteristics of alpine grassland vegetation community in the middle reaches of Lhasa River

作　　者：李伟娟 方江平[1] 周尧治[1] LI Weijuan;FANG Jiangping;ZHOU Yaozhi(Research Institute of Tibet Plateau Ecology, Tibet Agriculture ＆ Animal Husbandry University, Nyingchi 860000, Chin)

机构地区：[1]西藏农牧学院高原生态研究所

出　　处：《黑龙江畜牧兽医》2018年第11期55-58,62,共5页Heilongjiang Animal Science And veterinary Medicine

基　　金：“十二五”国家科技支撑计划项目(2013BAC04B02;2013BAC04B02-05);西藏自治区厅校联合基金重点项目(2016-ZR-NZ-01)

摘　　要：为了判断拉萨河中游草地植被群落的发展趋势和草地生态系统的健康状况,试验采用美国ASD公司的FieldSpec4 Wide-Res便携式地物光谱仪测定拉萨河中游草地植被群落的主要建群种、退化指示种及不同退化程度草地植被群落的光谱曲线。结果表明：绿峰值、红谷值、红边位置及红边斜率可以准确地对拉萨河中游草地植被群落的主要建群种与退化指示种进行识别和分类;将归一化植被指数（NDVI）、可见光波段、近红外波段（750-800 nm）、1 400 nm的水分吸收谷的反射率作为草地不同退化程度的诊断指标可以对不同退化程度的草地植被群落进行区分,从而判断拉萨河中游草地植被群落的发展趋势和草地生态系统的健康状况。The aim of the present study was to determine the developing trends of the grassland vegetation communities and the condition of grassland ecosystem in the middle reaches of Lhasa River. The spectral reflectance curve of main constructive species,degradation indicator species and grassland vegetation communities with different degradation degree in the middle reaches of Lhasa river were measured by using a Field Spec4 Wide-Res portable spectrometer of ASD corporation. The results showed that the green peak,red valleys,red edge position and red edge slope could be used to precisely identify and classify the main groups and degenerate indicators of the grassland vegetation community in the middle reaches of Lhasa river. The results indicated that as diagnostic indicators for the degree of grassland degradation,NDVI value,visible light band,near infrared band（ 750-800 nm） and 1 400 nm water absorption valley reflectivity could be used to classify the different vegetation communities in the grassland,hence we could judge the developing trends of the vegetation communities and the condition of grassland ecosystem in the middle reaches of Lhasa River.

关 键 词：拉萨河中游 植被群落光谱 光谱特征 不同退化程度 归一化植被指数 

分 类 号：S283[农业科学—农业水土工程]