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ORIGINAL RESEARCH
Spatial-Temporal Variations and Influencing
Factors of Vegetation Net Primary Productivity:
A Case Study of Yunnan Province, China
1
Faculty of Geography, Yunnan Normal University, Kunming, 650500, China
Submission date: 2024-01-20
Final revision date: 2024-03-27
Acceptance date: 2024-04-27
Online publication date: 2024-09-18
Publication date: 2025-01-28
Corresponding author
Pol. J. Environ. Stud. 2025;34(3):2141-2156
KEYWORDS
TOPICS
ABSTRACT
Exploring the spatial and temporal changes in vegetation net primary productivity (NPP)
and analyzing its complex relationship with influencing factors is crucial for assessing the carbon
absorption capability of vegetation. However, most of the existing studies have been conducted from
a temporal or spatial perspective, resulting in an unclear characterization of the spatio-temporal
divergence between NPP and the main influencing factors. This paper tries to break through the lack of
research on the spatiotemporal heterogeneity of the relationship between NPP and influencing factors
and proposes a joint spatiotemporal analysis method that integrates natural and anthropogenic factors,
uses correlation analysis to determine their relationship with NPP, then combines GeoDetector (GD)
and Geographically Weighted Regression (GWR), and carries out an empirical study based on the
data of 2001-2017, taking Yunnan Province as an example, to reveal the characteristics of influencing
factors’ divergence in different time and space. The results indicate that: (1) NPP in Yunnan Province
experienced fluctuations and increases from 2001 to 2017. (2) NDVI, precipitation, and temperature
exert a substantial influence on the spatial and temporal variation of NPP, although this impact
is diminishing. (3) Solar radiation, topography, and land use are secondary factors that affect the spatial
and temporal differentiation of NPP, but their influence is increasing. (4) From 2001 to 2010, land use
transfer was the main cause of NPP loss, but from 2010 to 2017, land use transfer was the main cause
of NPP gain. The collective effect of anthropogenic activities and natural factors is considerably more
substantial than the influence of any individual factor. This study aims to improve our understanding
of how the NPP responds to climate change and urbanization. Additionally, it seeks to clarify spatial
and temporal variations in NPP and identify its primary drivers. Furthermore, it can serve as a useful
scientific foundation and point of reference for improving the performance of ecosystem carbon sinks
and achieving carbon neutrality.
CONFLICT OF INTEREST
The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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