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Spatio-temporal variations and influencing factors of the stable forest land surface albedo in southeastern Guizhou Province |
YUAN Na1,2( ), LIU Suihua1,2( ), HU Haitao1,2, YIN Xia1,2, SONG Shanhai3 |
1. College of Geography and Environmental Science, Guizhou Normal University, Guiyang 550025, China 2. Key Laboratory of Remote Sensing Applications for Mountain Resources and Environment, Guizhou Normal University, Guiyang 550025, China 3. Guizhou Ecological Meteorology and Satellite Remote Sensing Center, Guiyang 550002, China |
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Abstract Land surface albedo (LSA) directly affects the radiation balance and surface energy balance of the earth-atmosphere system. Stable forest land exhibits integrated ecological vegetation, a relatively stable regional microclimate, and an intricate relationship with LSA. Based on the MODIS LSA (MCD43A3), enhanced vegetation index (EVI,MOD13Q1), land use (MOD12Q1), soil moisture, air temperature, and precipitation data, this study investigated the spatio-temporal variations in LSA of stable forest land in southeastern Guizhou Province, as well as their correlation with various factors and driving factors, through Theil-Sen (T-S)/Mann-Kendall (M-K) trend analysis, correlation analysis, and multiple regression analysis. The results show that: ① The stable forest land exhibited LSAs varying between 0.102~0.112, 0.110~0.113, and 0.099~0.102, respectively in the interannual period, growing season, and dormant season. These suggest an overall stable trend and a spatial distribution pattern characterized by low values in the central portion and high values in surrounding areas; ② The LSA was significantly negatively correlated with soil moisture in the inter-annual period and the growing season, with correlation coefficients of -0.951 and -0.943, respectively. In the dormant season, the LSA was significantly positively correlated with EVI, with a correlation coefficient of 0.933; ③ The LSA was subjected to the negative driving by EVI and air temperature and positive driving by soil moisture in the interannual period, growing season, and dormant season, with standardized coefficients of -9.168, -11.332, and 1.319, respectively. The results of this study can assist in accurately understanding the driving mechanism behind the LSA of stable forest land in southeastern Guizhou Province, thereby providing a reference for studying the climate change of forest land in small areas at low latitudes.
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Keywords
southeastern Guizhou Province
stable forest land
land surface albedo
spatio-temporal variation
driving factor
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Issue Date: 13 March 2024
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