WU Yajuan,LIU Tingxi,TONG Xin,et al.Hyperspectral Characteristics of Artemisia halodeudrou Communities in Different Succession Stages in Horqin Sandy Land[J].Research of Soil and Water Conservation,2020,27(06):160-167.
科尔沁沙地不同演替阶段差巴嘎蒿群落高光谱特征
- Title:
- Hyperspectral Characteristics of Artemisia halodeudrou Communities in Different Succession Stages in Horqin Sandy Land
- 文章编号:
- 1005-3409(2020)06-0160-08
- Keywords:
- Artemisia halodeudrou; community succession; continuum removal; first derivation; Mahalanobis distance
- 分类号:
- Q145; TP7
- 文献标志码:
- A
- 摘要:
- 为了研究干旱半干旱地区植被资源的可持续利用,以科尔沁沙地建群种差巴嘎蒿为主要研究对象,将群落演替划分为4个阶段,从“同物异谱”特性着手,利用连续统去除和一阶微分对原始光谱进行变换处理,使用马氏距离法确定了冠层原始光谱和变换光谱的差异显著波段。结果表明:同一时期的差巴嘎蒿群落随着演替进行,红边反射率持续上升,9月群落将进入凋萎期,总体曲线较5月降低; 对比不同演替阶段的差巴嘎蒿群落在导数变换以及连续统去除后的光谱特征,群落的一阶导数光谱在峰值、峰形、吸收峰位置存在显著差异,可以利用红边特征以及吸收深度进行识别,且9月特征识别效果好于5月; 马氏距离值能够科学快速地提取群落间差异较显著的特征波段,同时结合光谱变换达到了很好的降维效果,且提高了识别精度。其中9月份一阶导数变换降维效果最佳,且识别效果最优。研究利用一阶导数法与连续统去除法弱化了土壤背景的影响,为增强反射率特征及特征波段的差异性提供了较好的方法,同时马氏距离值能够反映不同光谱变换下差异显著的波段位置,有助于干旱半干旱地区植被识别研究。
- Abstract:
- As one of the main vegetation community species in arid and semi-arid areas, the rapid and accurate identification of Artemisia halodeudrou is beneficial to the effective utilization of vegetation resources in alpine areas. In order to study the sustainable utilization of vegetation resources in arid and semi-arid areas, the main objective of this study is to study the species diversity of Artemisia halodeudrou in Horqin Sandy Land. The community succession of Artemisia halodeudrou succession was divided into four stages and the characteristics of ‘same subject with different spectra' were studied. The method of continuum removal and first derivative reflectance were used to deal with the original spectral data. The Mahalanobis distance method was used to determine the significant difference between the original spectrum and the transform spectrum. The results showed that: at the same time, with the succession of Artemisia communities, the reflectivity of red edge continued to rise; in September, the community entered the wilting period, and the overall curve was lower than that in May; compared the spectral characteristics of Artemisia communities at different succession stages after first derivative transformation and continuum removal, the first derivative spectrum of the community showed significant differences in peak, peak shape and absorption peak positions; red edge and absorption depth could be used for recognition, and the best time for recognition was September; Mahalanobis distance could scientifically and quickly extract characteristic bands with significant differences between communities; the dimensional reduction effect was achieved by spectral transformation, and the recognition accuracy was improved; among them, the dimension reduction effect of the first derivative transformation in September was the best, and the identification effect was the best. The first derivative method and continuum removal method were used to weaken the influence of soil background, and provided the better method to enhance the reflectance characteristics and the difference of characteristic bands; at the same time, Mahalanobis distance range could express the positions of bands with significant differences under different spectral transforms, which was helpful to study vegetation identification in arid and semi-arid areas.
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相似文献/References:
[1]李春龙,谭国栋,孙钰,等.差巴嘎蒿生物网方格在辽西北流动沙丘生态修复中的应用研究[J].水土保持研究,2007,14(02):116.
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备注/Memo
收稿日期:2019-11-16 修回日期:2020-07-11
资助项目:国家自然科学基金(51620105003,51809141); 内蒙古自然科学基金重大项目与博士项目(2018ZD05,2018BS05001); 教育部创新团队发展计划(IRT_17R60); 科技部重点领域科技创新团队(2015RA4013); 内蒙古农业大学高层次人才科研启动金项目(NDYB2017-24); 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(NDTD2010-6)
第一作者:邬亚娟(1994—),女,内蒙古乌兰察布人,硕士研究生,研究方向为遥感生态水文。E-mail:wwyajuan@foxmail.com
通信作者:刘廷玺(1966—),男,内蒙古赤峰人,教授,主要从事干旱半干旱地区生态水文研究。E-mail:txliu1966@163.com