[1]XU Hong,LIU Qin.Analysis of Vegetation NDVI Dynamic and Its Relationship with Climatic Factors in Yunnan Province During 2001—2019[J].Research of Soil and Water Conservation,2022,29(01):162-168.
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Analysis of Vegetation NDVI Dynamic and Its Relationship with Climatic Factors in Yunnan Province During 2001—2019
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
29
Number of periods:
2022 01
Page number:
162-168
Column:
Public date:
2022-02-20
- Title:
- Analysis of Vegetation NDVI Dynamic and Its Relationship with Climatic Factors in Yunnan Province During 2001—2019
- Keywords:
- Yunnan; NDVI; change trend; climate; correlation analysis
- CLC:
- Q948; TP79
- DOI:
- -
- Abstract:
- It was of great significance to understand the temporal and spatial changes of vegetation cover for regional environmental protection and ecological environment construction. Based on MOD13Q1 data and methods of trend analysis and correlation analysis, the change of NDVI, the future trend and the spatial pattern of the relationship between vegetation and climate in Yunnan Province were discussed. The results showed that:(1)during the period from 2001 to 2019, the average NDVI of Yunnan vegetation was 0.68, and the annual change rate was 0.37%(p<0.001); the spatial distribution of NDVI was high in the west and south, low in the east and north;(2)the Hurst index of the whole province was 0.52; the trend of vegetation improvement would continue in the future, but there were differences among various types of land cover; the trend of vegetation change of forest and cropland would continue to improve; residential land would degrade; grassland and shrubbery would convert to degradant from improvement;(3)in recent 19 years, the annual average temperature and precipitation change rates in Yunnan were 0.03℃/a and -2.67 mm/a, respectively; the correlations between NDVI and annual average temperature and precipitation were 0.26 and 0.21, respectively; these were positive correlations in the most areas; in the whole, the influence of temperature on vegetation was greater than precipitation;(4)the lag time of vegetation change response to temperature and precipitation changes were 1.9 months and 1.5 months, respectively, the impact of precipitation was more sensitive than temperature on the monthly scale; for different vegetation types, the lag time of forest and shrub vegetation was longer than those of cropland and grassland, and forest vegetation was the least vulnerable in short-term. In conclusion, the vegetation NDVI improved significantly in Yunnan in the past 19 years. This trend would be continued in the future. The regional distribution characteristics of the correlation between vegetation NDVI and temperature and precipitation were obvious.
- References:
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Last Update:
2022-02-20