Analysis of Spatial-temporal Changes and Driving Forces of NDVI from 2001 to 2019 Based on MODIS Data:Taking Aksu as an Example

doi:10.11924/j.issn.1000-6850.casb2021-0399

Abstract

Abstract:

Vegetation is one of the important factors in the ecosystem. An in-depth understanding of the changes and driving factors of vegetation cover could provide important reference for ecological environmental protection. Taking Aksu as the research area, the NDVI variation characteristics from 2001 to 2019 were analyzed based on the long-term series of MODIS data. The relationship between vegetation and climate was explored by using two methods: linear regression analysis and correlation analysis. The results showed that: from 2001 to 2019, the vegetation cover in Aksu showed an overall increasing trend and the trend was most obvious in summer which was the growing season. The vegetation cover of the study area showed a pattern of spreading mainly from oasis to the surrounding areas. The NDVI response to temperature and precipitation in the growing season showed significant seasonal differences, and had an extremely significant correlation with temperature but not obvious correlation with precipitation. The impact of human production and life on the change of vegetation cover had both positive and negative aspects.

Key words: MODIS, NDVI, vegetation cover, driving force, growing season

CLC Number:

BU Xiang, ZHANG Yongfu, LIANG Tiantian, WANG Jianguo. Analysis of Spatial-temporal Changes and Driving Forces of NDVI from 2001 to 2019 Based on MODIS Data:Taking Aksu as an Example[J]. Chinese Agricultural Science Bulletin, 2022, 38(11): 75-83.

Figures/Tables 10

References 29

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植被覆盖等级	等级度	划分依据	占比/%	NDVI等级值范围
极低值覆盖	1	X≤0.20	3.92	0.081~0.088
低值覆盖	2	0.02<X≤0.40	50.08	0.088~0.095
中值覆盖	3	0.40<X≤0.60	25.16	0.095~0.102
高值覆盖	4	0.60<X≤0.80	10.82	0.102~0.109
极高值覆盖	5	X≥0.80	10.02	0.109~0.116

植被覆盖等级	等级度	划分依据	占比/%	NDVI等级值范围
极低值覆盖	1	X≤0.20	3.92	0.081~0.088
低值覆盖	2	0.02<X≤0.40	50.08	0.088~0.095
中值覆盖	3	0.40<X≤0.60	25.16	0.095~0.102
高值覆盖	4	0.60<X≤0.80	10.82	0.102~0.109
极高值覆盖	5	X≥0.80	10.02	0.109~0.116