科尔沁沙地5种典型沙生植被高光谱特性分析与遥感解译参数提取

发布时间：2018-04-25 05:12

本文选题：光谱特征 + 沙生植被　；参考：《生态与农村环境学报》2017年07期

【摘要】：采用Field Spec 4便携式光谱仪对科尔沁5种典型沙生植被进行光谱测量,并对其特征进行提取分析,结果表明:(1)黄柳(Salix flavida)、冷蒿(Artemisia frigida)、麻黄(Herbal ephedrae)、差巴嘎蒿(Artemisia halodeudrou)和小叶锦鸡儿(Caragana microphylla)5种典型沙生植被的光谱形态大致相同,但又略有差异。在600~690和750~900 nm波段处差异较大,根据光谱差异波段和导数光谱参数可以区分冷蒿、麻黄和差巴嘎蒿,但不能区分黄柳和小叶锦鸡儿。(2)随着植被生长期的推移,"绿峰"位置先向蓝光方向偏移再向红光方向偏移,黄柳、冷蒿、麻黄和小叶锦鸡儿4种沙生植被光谱对应的"红边"均具有明显的"双峰",而差巴嘎蒿光谱"红边"区的"双峰"现象不甚明显;黄柳、麻黄和小叶锦鸡儿光谱的"红边"区出现明显的"红移"现象,黄柳和冷蒿的"红边"区在9月末出现"蓝移"现象,而冷蒿和差巴嘎蒿的"红边"位置呈微弱向蓝光方向偏移态势,"红移"现象并未出现。5种典型沙生植被在8、9月均具有"红边平台",其中,差巴嘎蒿和小叶锦鸡儿在日期09-27均持续处于"红边平台"位置。(3)5种典型沙生植被在红光波段处的吸收明显比蓝光波段处强烈,吸收深度也比蓝光波段处深。随着植被的生长,5种沙生植被的吸收深度和吸收峰面积变化趋势相同。在夏季,麻黄变化比其他4种植被更明显。同时,对不同生长时期5种沙生植被归一化植被指数(NDVI)进行分析可知,NDVI的变化趋势与吸收深度大体相同,与吸收峰面积的变化趋势相反。(4)不同生长时期的"红边"参数、"吸收"参数和时序NDVI数据识别植被的效果明显好于其他参数。在对研究区植被进行分类时,应选择春季(植被生长初期)和秋季中晚期(植被生长衰退期)的多时相遥感影像进行联合解译会取得更好的效果。
[Abstract]:The Field Spec 4 portable spectrometer was used to measure the 5 typical sandy vegetation of Horqin, and the characteristics were extracted and analyzed. The results showed that: (1) Huang Liu (Salix flavida), Artemisia (Artemisia FRIGIDA), Ephedra (Herbal Ephedrae), poor Artemisia (Artemisia halodeudrou) and Caragana microlois (Caragana microphylla) 5 typical sand The spectral morphology of the vegetative vegetation is roughly the same, but there is a slight difference. The difference between the 600~690 and 750~900 nm bands is great. According to the spectral difference band and derivative spectral parameters, the Artemisia Artemisia, ephedra and Artemisia are distinguished, but there is no distinction between the Yellow willow and the Caragana microphylla. (2) the position of "green peak" is first shifted to blue light as the growth period of vegetation goes on. The "red edge" of 4 species of yellow willow, Artemisia, ephedra and Caragana have obvious "Shuangfeng", while the "Shuangfeng" phenomenon in the "red edge" area of the spectrum is not very obvious, and the "red shift" phenomenon of yellow willow, ephedra and Caragana in the "red edge" area of the Yellow willow, ephedra and Caragana is obvious, and the red edge of the Yellow willow and the Artemisia Artemisia. The "blue shift" phenomenon appeared at the end of 9 month, while the "red edge" position of Artemisia Artemisia and Artemisia Artemisia was slightly shifted to blue light. The "red shift" phenomenon did not show the "red edge platform" of typical.5 species of sandy vegetation on the 8,9 month, and the date 09-27 of the Artemisia Artemisia and the Caragana microphylla were always in the "red edge platform" position. (3) 5 kinds of typical sand. The absorption of the raw vegetation in the red light band is stronger than the blue light band, and the absorption depth is deeper than the blue light band. With the growth of the vegetation, the absorption depth and the absorption peak area of the 5 kinds of sandy vegetation are the same. In summer, the change of Ephedra is more obvious than the other 4 plants. At the same time, 5 kinds of sandy vegetation were normalized at different growth stages. The analysis of vegetation index (NDVI) shows that the change trend of NDVI is the same as that of absorption depth. (4) the effect of "red edge" parameter, "absorption" parameter and time series NDVI data in different growth period is better than that of its parameter. The joint interpretation of multi temporal remote sensing images in the early stage of growth and the middle and late autumn (vegetation growth decline) will achieve better results.

【作者单位】：内蒙古农业大学水利与土木建筑工程学院/内蒙古自治区水资源保护与利用重点实验室;
【基金】：国家自然科学基金重点国际(地区)合作研究项目重点项目和面上项目(51620105003,51139002,51479086) 内蒙古水利科技项目教育部科技创新团队发展计划(IRT13069) 科技部重点领域创新团队项目(2015RA4013) 内蒙古自治区草原英才产业创新创业人才团队内蒙古农业大学寒旱区水资源利用创新团队项目(NDTD2010-6)
【分类号】：Q948;TP79

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