Spatial and temporal change characteristics of vegetation coverage in Erhai Lake basin during 1988—2018

doi:10.6046/gtzyyg.2020283

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Abstract

As an important indicator reflecting the surface ecological environment, vegetation is widely used in the study of regional resources and environmental carrying capacity. Taking Erhai Lake basin as an example and based on the Google Earth Engine remote sensing big data cloud computing platform, the authors obtained the annual maximum normalized difference vegetation index (NDVI) value of Erhai Lake basin in 1988—2018 by using nearly 455 Landsat series images with 30 m resolution. The pixel binary model was used for quantitative estimation of fractional vegetation cover (FVC), and the spatial-temporal change characteristics of FVC in Erhai Lake basin were comprehensively analyzed through the linear regression model. Additionally, the internal relationship between FVC and geological lithology was investigated. The results are as follows: (1) From 1988 to 2018, the vegetation coverage of Erhai Lake basin showed a trend of continuous fluctuation growth, with a growth rate of 0.38%/a. (2) The basin was dominated by high vegetation coverage, of which 82.54% of the regional vegetation coverage continued to be improved, whereas the area of continuous degradation accounted for only 3.27%, which was mainly distributed in the area with significant urbanization. (3) the FVC varied in different types of lithological areas, among which the highest was metamorphic rock, and the lowest was dolomite and volcanic rock.

Keywords Google Earth Engine Erhai Lake basin fractional vegetation cover pixel binary model temporal and spatial changes analysis

ZTFLH:

TP79

Corresponding Authors: GUO Zhaocheng E-mail: chch1223@126.com;guozc@agrs.cn

Issue Date: 21 July 2021

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	Hong CHEN
	Zhaocheng GUO
	Peng HE

Cite this article:

Hong CHEN,Zhaocheng GUO,Peng HE. Spatial and temporal change characteristics of vegetation coverage in Erhai Lake basin during 1988—2018[J]. Remote Sensing for Land & Resources, 2021, 33(2): 116-123.

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https://www.gtzyyg.com/EN/10.6046/gtzyyg.2020283 OR https://www.gtzyyg.com/EN/Y2021/V33/I2/116

Fig.1 Satellite image of Erhai Lake basin

Tab.1 Distribution of Landsat series images in Erhai Lake basin(1988—2018)(景)

Fig.2 Spatial distribution corresponding to different lithologic types in Erhai Lake basin

Fig.3 Inter-annual variations of FVC over Erhai Lake basin during 1988—2018

Fig.4 FVC Inter-annual change trend of FVC in Erhai Basic (1988—2018)

Fig.5 Comparison of the FVC distribution at Erhai Lake basin in four periods (1988—2018)

Tab.2 Vegetation coverage area and rate of different levels of FVC in Erhai Basin from 1988 to 2018

Fig.6 Changes of FVC values corresponding to different lithologic types in Erhai Lake basin

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