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Assessing the impact of land surface temperature on urban net primary productivity increment based on geographically weighted regression model
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Journal Article
Assessing the impact of land surface temperature on urban net primary productivity increment based on geographically weighted regression model
2021
Overview
Urbanization had a huge impact on the regional ecosystem net primary productivity (NPP). Although the urban heat island (UHI) caused by urbanization has been found to have a certain promoting effect on urban vegetation NPP, the factors on the impact still are not identified. In this study, the impact of urbanization on NPP was divided into direct impact (NPP
dir
) and indirect impact (NPP
ind
), taking Kunming city as a case study area. Then, the spatial heterogeneity impact of land surface temperature (LST) on NPP
ind
was analyzed based on the geographically weighted regression (GWR) model. The results indicated that NPP, LST, NPP
dir
and NPP
ind
in 2001, 2009 and 2018 had significant spatial autocorrelation in Kunming based on spatial analytical model. LST had a positive impact on NPP
ind
in the central area of Kunming. The positively correlation areas of LST on NPP
ind
increased by 4.56%, and the NPP
ind
caused by the UHI effect increased by an average of 4.423 gC m
−2
from 2009 to 2018. GWR model can reveal significant spatial heterogeneity in the impacts of LST on NPP
ind
. Overall, our findings indicated that LST has a certain role in promoting urban NPP.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
