Response of vegetation index to degraded succession of alpine meadow in Qinghai， China

doi:10.7522/j.issn.1000-694X.2021.00007

Journal of Desert Research ›› 2021, Vol. 41 ›› Issue (3): 203-213.DOI: 10.7522/j.issn.1000-694X.2021.00007

Response of vegetation index to degraded succession of alpine meadow in Qinghai， China

Xuegang Xing¹^,²(), Changzhen Yan¹^,³(), Junfeng Lu¹, Xiaohui Zhai¹^,², Haowei Jia¹^,², Jiali Xie¹

^1.Northwest Institute of Eco-Environment and Resources，Chinese Academy of Sciences，Lanzhou 730000，China
^2.University of Chinese Academy of Sciences，Beijing 100049，China
^3.National Earth System Science Data Center，Beijing 100020，China

Received:2020-10-09 Revised:2021-01-13 Online:2021-05-26 Published:2021-05-26
Contact: Changzhen Yan

Abstract

Abstract:

With the climate change and disturbance of human activities， the degradation of Qinghai-Tibet plateau meadow has become a serious ecological and environmental problem. It is of great significance to accurately identify the degradation degree of meadow and formulate the corresponding strategies for restoration of degraded meadow to realize the sustainable development of alpine meadow. Currently， low spatial resolution MODIS data is the main data source for remote sensing monitoring of grassland degradation， but it is difficult to meet the application in areas with strong landscape fragmentation or heterogeneity. Based on field survey data， this study uses multi-source remote sensing data （MODIS， Landsat， and Sentinel-2） to study the response of the normalized vegetation index （NDVI） at different scales to the degraded succession of alpine meadows， and provides a basis for accurately assessing the degree of meadow degradation. The results showed that：（1） With the degradation of alpine meadows， the evolution trend of dominant species in the vegetation community was from gramineae grass， kobresia humilis， kobresia pygmaea to forbs community； vegetation height and biomass first declined rapidly， then slowly declined or tended to stable， while the vegetation coverage and NDVI changes have opposite characteristics. （2） With the drought of wetland meadows， the dominant species of vegetation community changes from kobresia tibetica to kobresia humilis or kobresia pygmaea. The average vegetation height， biomass and coverage of wetland are slightly lower than that of the original wetland at the initial stage of drought. NDVI is slightly larger than the original wetland， and the difference is not significant. （3） The correlation between meadow height， coverage and biomass and NDVI of Sentinel-2 or Landsat was better than MODIS， indicating that NDVI of Sentinel-2 and Landsat was more sensitive to degradation succession of alpine meadow， and the data could be used to evaluate the degradation degree of alpine meadow more accurately.

Key words: alpine meadow, wetland meadow, normalized vegetation index （NDVI）, degenerate succession

CLC Number:

Q948.5

Xuegang Xing, Changzhen Yan, Junfeng Lu, Xiaohui Zhai, Haowei Jia, Jiali Xie. Response of vegetation index to degraded succession of alpine meadow in Qinghai， China[J]. Journal of Desert Research, 2021, 41(3): 203-213.

Figures/Tables 7

Fig.1 Distribution map of study area and sampling points

Fig.2 Field investigation and indoor treatment for biomass, coverage and height of sampling sites

Table 1 The information of NDVI with different spatial resolutions

数据类型	空间分辨率/m	所用影像
Sentinel-2_NDVI	10	Sentinel-2 MSI: MultiSpectral Instrument, Level-2A
Landsat_NDVI	30	Landsat 8 Surface Reflectance
MODIS_NDVI₂₅₀	250	MOD13Q1
MODIS_NDVI₅₀₀	500	MOD13A1
MODIS_NDVI₁₀₀₀	1000	MOD13A2

Fig.3 Field photos and NDVI visualization of alpine meadows and wetland meadows at different degradation stages. Pictures from 1 to 7 are field photos, Landsat false color images, Sentinel-2_NDVI, Landsat_NDVI, MODIS_NDVI250, MODIS_NDVI500, and MODIS_NDVI1000, respectively; white dots represent the sampling point of alpine meadows and wetland meadow at different degradation stages

Fig.4 Statistics of biomass, coverage and height of alpine meadow and wetland meadow in different degradation stages

Fig.5 Vegetation NDVI statistical map of alpine meadow at different degradation stages

Fig.6 Correlation between height, coverage, biomass and NDVI of alpine meadow (A-E: Sentinel2_NDVI, Landsat_NDVI, MODIS_NDVI250, MODIS_NDVI500, MODIS_NDVI1000)

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Response of vegetation index to degraded succession of alpine meadow in Qinghai， China

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