[1]PI Guining,HE Zhonghua,ZHANG Lang,et al.Response of Vegetation to Meteorological Drought in Watershed at Different Time Scales[J].Research of Soil and Water Conservation,2022,29(04):277-284+291.
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Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
29
Number of periods:
2022 04
Page number:
277-284+291
Column:
Public date:
2022-06-20
- Title:
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Response of Vegetation to Meteorological Drought in Watershed at Different Time Scales
- Author(s):
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PI Guining, HE Zhonghua, ZHANG Lang, YANG Mingke, YOU Man
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(School of Geographic and Environmental Science, Guizhou Normal University, Guiyang 550025, China)
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- Keywords:
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meteorological drought; NDVI; EVI; response analysis
- CLC:
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P463.22
- DOI:
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- Abstract:
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In order to explore the response of vegetation growth trend to multi-time scale meteorological drought in Guizhou Province, based on monthly MODIS-NDVI and EVI images and meteorological data from 2001 to 2020, Pearson correlation coefficient, slope trend analysis and other methods were used to analyze the vegetation growth status and spatial and temporal variation characteristics of meteorological drought in Guizhou Province in 20 years. The results show that:(1)the different time scales of SPEI in Guizhou Province showed a trend of slow increase on the whole, indicating that the degree of drought had decreased; the spatial distribution of the aridity trend presented in Zunyi, Tongren and Southwest Guizhou;(2)the overall vegetation growth in Guizhou Province showed a slow increasing trend, but there were differences in spatial distribution; the vegetation growth in southeast Guizhou Province showed a decreasing trend, while that in the west of Bijie City showed an increasing trend;(3)there was a positive correlation between vegetation growth and drought on different time scales in Guizhou Province; the vegetation in southwest and northern Guizhou Province had the strongest response to drought, followed by Guiyang and eastern Bijie; among different land use types, grassland had the strongest response to SPEI3, followed by cultivated land and forest land; the response of different vegetation types to SPEI3 and SPEI12 was stronger in the growing season. In conclusion, there are some differences in the spatial and temporal distribution characteristics of vegetation and meteorological drought in Guizhou Province, and different vegetation types have different responses to meteorological drought at different time scales.