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中国农学通报 ›› 2021, Vol. 37 ›› Issue (26): 105-109.doi: 10.11924/j.issn.1000-6850.casb2020-0802

• 资源·环境·生态·土壤·气象 • 上一篇    下一篇

极旱荒漠区湿地植被动态变化监测——以甘肃敦煌阳关国家级自然保护区为例

纪树志()   

  1. 甘肃敦煌阳关国家级自然保护区管理局,甘肃敦煌 736200
  • 收稿日期:2020-12-17 修回日期:2021-02-18 出版日期:2021-09-15 发布日期:2021-09-30
  • 作者简介:纪树志,男,1988年出生,辽宁北票人,工程师,硕士,研究方向:环境遥感与GIS应用。通信地址:736200 甘肃省敦煌市沙洲南路463号, E-mail: nwnujsz@163.com
  • 基金资助:
    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)

Monitoring of the Dynamic Change of Wetland Vegetation in Extremely Arid and Desert Areas: Taking Gansu Dunhuang Yangguan National Nature Reserve as an Example

Ji Shuzhi()   

  1. Administration of Gansu Dunhuag Yangguan National Nature Reserve, Dunhang Gansu 736200
  • Received:2020-12-17 Revised:2021-02-18 Online:2021-09-15 Published:2021-09-30

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。

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

Abstract:

Based on 541 Landsat 5 TM and Landsat 8 OLI images from 1988 to 2016, the normalized vegetation index (NDVI) of wetland vegetation (mainly reeds) in Xitugou and Wowachi in the extremely arid desert region was calculated, the characteristics of wetland vegetation were analyzed from NDVI, wetland vegetation area and average NDVI, the vegetation coverage of Wowachi wetland and Xitugou wetland in Dunhuang Yangguan National Nature Reserve (hereinafter referred to as Yangguan Nature Reserve) was estimated 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 statistical calculation of wetland vegetation in the nature reserve, the change trend was studied. It was found that the wetland vegetation in Wowachi and Xitugou had an obvious increasing trend.

Key words: 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

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