东北三省NDVI时空变化特征及对气候因子的响应

doi:10.3969/j.issn.1673-503X.2024.01.009

Abstract

Abstract:

The northeast region of China is one of the most sensitive areas responsing to global climate change. Understanding the spatio-temporal variation of vegetation and its response to climatic factors is of great significance for the construction and evaluation of the ecological environment in the three northeast provinces, and also plays an important indicative role in the response to global climate change. Based on the MODIS Normalized Difference Vegetation Index (NDVI), the spatio-temporal evolution characteristics and the future change trends of NDVI in the three northeast provinces from 2000 to 2021 were investigated using the methods of Theil-Sen slope estimation, Mann-Kendall test, and Hurst index, and the response of NDVI to climatic factors was estimated with correlation analysis. The results show that from 2000 to 2021, the annual growth rate of NDVI is 0.003 per year, whereas from 2010 to 2021, NDVI is a highly significant increasing trend, with an annual growth rate of 0.006 per year. NDVIs in 86.93% of the area in the three northeast provinces is projected to increase in the future, indicating a positive trend in vegetation growth. In addition, correlation analysis shows that NDVI depends on climatic factors at a spatial scale. Specifically, temperature shows a better correlation with NDVI. In the most areas of the three northeast provinces, both temperature and precipitation contribute positively to NDVI change, and their contributions are comparable though spatial differences exist.

Key words: NDVI, Theil-Sen slope estimation, Hurst index

CLC Number:

P461⁺.7

Yong XIE,Shuang WANG,Hengyang WANG,Xu YANG,Fulong ZHANG,Ning WANG,Feng TAO. Spatio-temporal variation characteristics of NDVI in the three northeast provinces and their responses to climatic factors[J]. Journal of Meteorology and Environment, 2024, 40(1): 71-78.

Figures/Tables 7

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Spatio-temporal variation characteristics of NDVI in the three northeast provinces and their responses to climatic factors

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