牛心朴子的光谱差异特征参量分析  

Analysis of spectral difference feature parameters of Cynanchum komaroviii

作　　者：常伟[1] 刘咏梅[1] 庞国伟[1] 高原[1] 王德军 

机构地区：[1]西北大学城市与环境学院,陕西西安710127 [2]阿拉善左旗腾格里镇动物卫生监督站,内蒙古阿拉善盟750314

出　　处：《草业科学》2016年第11期2165-2172,共8页Pratacultural Science

基　　金：农业部公益性行业专项--草原主要毒害草发生规律与防控技术研究(201203062)

摘　　要：牛心朴子(Cynanchum komarovii)是分布在西北干旱半干旱荒漠草原的主要毒害草之一。近年来,牛心朴子快速蔓延对当地畜牧业发展和草原生产力的影响日益严重。采用内蒙古阿拉善左旗典型样区内牛心朴子和其它沙地植物的野外实测光谱,通过叶片光谱、冠层光谱及群落样方光谱的对比分析,探讨牛心朴子与其它沙地植物的光谱差异性。结果表明,在350-2 500nm波段,牛心朴子叶片的光谱反射率均高于花的反射率,花的反射光谱未出现明显的蓝谷和绿峰。沙地背景对牛心朴子冠层光谱的影响强烈,冠层光谱是沙地与牛心朴子叶片光谱的综合表征。最大的红边斜率以及800-1 300nm明显的高反射率是牛心朴子与其它沙地植物冠层光谱的主要差异特征。根据不同盖度牛心朴子群落样方光谱的变化规律,选取4个特征参量与群落盖度进行线性回归分析表明:利用红边斜率进行群落盖度反演的效果最好,R^2为0.781 5。本研究可为牛心朴子分布遥感监测及其盖度定量反演提供科学依据。Cynanchum komarovii is one of the main poisonous weed distributed in arid and semi-arid desert steppes of northwest china.In recent years,rapid spreading of C.komarovii has brought serious harm to local animal husbandry and grassland productivity.With field measured spectra of C.komarovii and other psammophyte plants acquired in the typical district of Alxa Left Banner,Inner Mongolia,spectral characteristics of leaf,canopy and community were compared to discuss the differences between C.komarovii and other psammophyte plants.The results showed that the reflectance of C.komarovii leaf was higher than that of the flower in350-2 500 nm and the flower spectra did not appear obvious blue valley and green peak.Sand background has strong influence on the canopy spectra of C.komarovii,which was the combination of the leaf and sand.The main spectral differences between canopy spectra of C.komarovii and other psammophyte plants were the largest red edge slope and obvious high reflectance in 800-1 300 nm.According to spectra changes of C.komarovii communities with different coverage,4feature parameters were selected to analysis the linear regression between parameters and community coverage which showed red edge slope had the best result（R^2=0.781 5）.This study provides scientific basis for monitoring and retrievaling coverage of C.komarovii using remote sensing techniques.

关 键 词：牛心朴子 沙地植物 光谱特征参量 阿拉善左旗 

分 类 号：S812.6[农业科学—草业科学]