黄河口典型植被光谱及NDVI变化对比分析  

Comparison analysis of typical vegetation spectrum and NDVI changes in the Yellow River Estuary

作　　者：单春芝[1] 王娟[1] 孙乐成[1] 刘旭东[1] SHAN Chunzhi;WANG Juan;SUN Lecheng;LIU Xudong(North China Sea Environmental Monitoring Center,State Oceanic Administration,Qingdao 266033)

机构地区：[1]国家海洋局北海环境监测中心,山东青岛266033

出　　处：《海洋通报》2021年第1期62-69,共8页Marine Science Bulletin

基　　金：国家重点研发计划(SQ2018YFC140023-05)。

摘　　要：作为黄河口地区两种典型的植被群落类型,芦苇群落(Comm.Phragmites australis)与互花米草群落(Comm.Spartina alterniflora)在遥感影像的表征较为相似,利用单时相遥感影像识别时,易存在混淆区域。工作中发现,两种植被处于不同生长期时,其遥感影像具有不同的表征。为了提高黄河口地区芦苇、互花米草两类植被群落遥感识别结果的可靠性,本文通过获取多时相遥感影像中芦苇、互花米草群落纯净像元的光谱值,分析植被“红边”光谱曲线随时间的变化特征,进一步计算研究区多期遥感影像NDVI(Normalized Difference Vegetation Index),提取纯净像元的NDVI值,对比分析这两种植被NDVI指数在时间序列上的变化特征,发现芦苇群落与互花米草群落的NDVI值在时间序列上存在明显区别。结果表明,利用5月的影像能够较好地识别芦苇群落的分布范围,利用11月影像能够较好地识别互花米草群落的分布范围。本研究结果可为今后黄河口地区这两类典型植被群落的遥感识别方法研究提供可靠依据。As two typical vegetation communities in the Yellow River Estuary,Comm.Phragmites australis and Comm.Spartina alterniflora are similar in the representation of remote sensing images.They can be easily confused in the process of single-phase remote sensing image recognition.It is found in the work that the two vegetation communities are different in different growth periods.Therefore,in order to improve the reliability of the results of remote sensing recognition of these two typical vegetation,the spectral values of pure pixels were extracted to analyze the change characteristics of"red edge"with time.Further,multi-phase remote sensing image NDVI in the study area was calculated and the value of pure pixels was extracted.By comparing and analyzing the NDVI change characteristics of the two vegetations in the time series,it is found that the NDVI values are significantly different.Experiments prove that the distribution of P.australis can be better identified using the May image and the distribution range of S.alterniflora can be identified using the November image.The conclusion can be used for remote sensing recognition of these two vegetations in the Yellow River Estuary and it is reliable.

关 键 词：黄河口 芦苇 互花米草 植被群落 NDVI 识别 

分 类 号：P736.22[天文地球—海洋地质]