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

doi:10.11924/j.issn.1000-6850.casb2020-0802

Abstract

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

CLC Number:

X835

Ji Shuzhi. Monitoring of the Dynamic Change of Wetland Vegetation in Extremely Arid and Desert Areas: Taking Gansu Dunhuang Yangguan National Nature Reserve as an Example[J]. Chinese Agricultural Science Bulletin, 2021, 37(26): 105-109.

Figures/Tables 5

References 21

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波段	Landsat5 TM		Landsat8 OLI
波段	波段指数	波长/μm	波段指数	波长/μm
红外波段	Band 3	0.626~0.693	Band 4	0.636~0.673
近红外波段	Band 4	0.776~0.904	Band 5	0.851~0.879

波段	Landsat5 TM		Landsat8 OLI
波段	波段指数	波长/μm	波段指数	波长/μm
红外波段	Band 3	0.626~0.693	Band 4	0.636~0.673
近红外波段	Band 4	0.776~0.904	Band 5	0.851~0.879

	G_λ	B_λ
3波段	1.043976	-2.21
4波段	0.876024	-2.39

	G_λ	B_λ
3波段	1.043976	-2.21
4波段	0.876024	-2.39