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[1]XIONG Qiaoli,HE Yunling,LI Tongyan,et al.Spatiotemporal Patterns of Vegetation Coverage and Response to Climatic and Topographic Factors in Growth Season in Southwest China[J].Research of Soil and Water Conservation,2019,26(06):259-266.

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Spatiotemporal Patterns of Vegetation Coverage and Response to Climatic and Topographic Factors in Growth Season in Southwest China

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 26 Number of periods: 2019 06 Page number: 259-266 Column: Public date: 2019-10-17

Title:: Spatiotemporal Patterns of Vegetation Coverage and Response to Climatic and Topographic Factors in Growth Season in Southwest China

Author(s):: XIONG Qiaoli, HE Yunling, LI Tongyan, YU Lan; School of Resources Environment & Earth Science, Yunnan University, Kunming 650091, China

Keywords:: NDVI; vegetation cover change; spatiotemporal patterns; climatic factors; topographic factor; southwest China

CLC:: Q948

DOI:: -

Abstract:: In order to explore the temporal and spatial variation characteristics of vegetation cover in the growing season in southwest China and how the driving factors quantitatively affect its dynamic changes, based on the moderate resolution imaging spectrometer (MODIS) NDVI data, the spatiotemporal variation characteristics of vegetation cover in the growth season from 2000 to 2016 in southwest China were investigated using trend analysis, variation coefficient, correlation analysis and other methods, and the relationships between the NDVI with climatic and topographic factors were analyzed in combination with climate and DEM data. The results showed that NDVI in the growth season of southwest China presented the increasing trend (0.009/decade) in the past 17 years, with the most significant increasing rate in April (0.029/decade). The areas showing an increasing trend accounted for 71.94% of the total area, mainly distributed in the eastern and southeastern regions. Vegetation cover changes were dominated by low stability (31.15%) and moderate stability (25.36%). Temperature and precipitation are mainly positively correlated with NDVI in spatial distribution. The correlation between monthly NDVI and climatic factors was higher than annual values. The correlation between vegetation coverage and monthly average temperature is higher than that between vegetation coverage and monthly precipitation. The response of vegetation growth to the change of precipitation month is not obvious, and the response to temperature has no obvious lag effect. The minimum average NDVI is at an altitude of more than 4 000 m area (0.30), and at the slope 0°~5°(0.37), but significant degradation trends of NDVI is at an altitude of more than 4 000 m (14.33%). The area at the altitude more than 4 000 m is mainly controlled by rainfall, and the region at the slope of 5°~15° is mainly controlled by the temperature. The effect of slope aspect on vegetation growth is less significant than that of elevation and slope gradient.

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