摘要
利用1988—2016年共541幅Landsat 5 TM和Landsat 8 OLI影像,计算了极旱荒漠区中西土沟和渥洼池湿地植被(以芦苇为主)的归一化植被指数(NDVI),分别从NDVI,湿地植被面积和平均NDVI这3个方面对湿地植被特征进行分析,对敦煌阳关国家级自然保护区(以下称阳关保护区)内的渥洼池和西土沟湿地植被进行植被覆盖度估算,判断其变化。根据谷歌影像和现地调查,确定NDVI>0.1是识别西土沟和渥洼池湿地植被的最佳阈值,通过对保护区湿地植被的统计计算,研究其变化趋势。研究发现,渥洼池和西土沟的湿地植被都有明显的增加趋势。
Based on 541 Landsat 5 TM and Landsat 8 OLI images from 1988 to 2016, the normalizedvegetation index(NDVI) of wetland vegetation(mainly reeds) in Xitugou and Wowachi in the extremely ariddesert region was calculated, the characteristics of wetland vegetation were analyzed from NDVI, wetlandvegetation area and average NDVI, the vegetation coverage of Wowachi wetland and Xitugou wetland inDunhuang Yangguan National Nature Reserve(hereinafter referred to as Yangguan Nature Reserve) wasestimated to determine the changes. According to Google Image and field survey, we determined that NDVI >0.1 was the best threshold to identify vegetation in Xitugou and Wowachi wetlands, through the statisticalcalculation of wetland vegetation in the nature reserve, the change trend was studied. It was found that thewetland vegetation in Wowachi and Xitugou had an obvious increasing trend.
作者
纪树志
Ji Shuzhi(Administration of Gansu Dunhuag Yangguan National Nature Reserve,Dunhang Gansu 736200)
出处
《中国农学通报》
2021年第26期105-109,共5页
Chinese Agricultural Science Bulletin
基金
2020年度自列省级林业和草原科技项目计划“阳关保护区湿地生态系统动态监测”(2020kj069)。
关键词
河西走廊
干旱和半干旱湿地
湿地植被
归一化植被指数
Landsat影像
极旱荒漠区
植被覆盖度
阈值
Hexi Corridor
Wetlands in arid and semi-arid areas
wetland vegetation
normalized differential vegetation index
Landsat imaging
extremely arid and desert areas
vegetation coverage
threshold
