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<p>Vegetation Net Primary Productivity (NPP) is a vital indicator of the terrestrial carbon cycle, effectively reflecting vegetation’s carbon sequestration ability. This study analyzes NPP dynamics and their response to LUCC in Guiyang from 2000 to 2020. By combining CASA with LUCC transition and gain–loss analyses and applying a construction-land-based core–edge–rural gradient, it identifies spatial differentiation in NPP along the urbanization gradient and quantifies the contrasting effects of urban expansion and ecological restoration on carbon sequestration. The findings indicate that: (1) Spatially, vegetation NPP in Guiyang exhibits a pronounced gradient, with higher values in the north and lower values in the south and follows a clear pattern of rural &gt; edge &gt; core along the urbanization gradient. (2) Temporally, the intra-annual variation of vegetation NPP exhibits a unimodal (trend peak in July, trough in January). Guiyang’s average annual vegetation NPP (2000–2020) increased at 1.90 gC/m<sup>2</sup>·a. (3) During 2000–2020, the NPP of cropland, forest, and shrub has generally increased with the rates of 1.97gC/m<sup>2</sup>·a, 2.23 gC/m<sup>2</sup>·a, and 5.19 gC/m<sup>2</sup>·a, while the NPP of grasslands has declined (–2.88 gC/m<sup>2</sup>·a). (4) LUCC in Guiyang are primarily characterized by a transition from farmland to forest between 2000 and 2020, contributing to a net increase of 31,325.81 tC in vegetation NPP. The research results provide data and theoretical support for ecological management and sustainable urban development strategies that aim to enhance vegetation carbon sequestration efficiency in karst regions undergoing urbanization.</p>

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Spatiotemporal variation trends of vegetation net primary productivity in Guiyang City over the past two decades in the context of urbanization

  • 期刊论文

  • 发表日期：

    2026年1月6日

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  • Yingqian Huang,
  • Xuehai Fei,
  • Renhai Zhang,
  • Binghuang Zhou,
  • Haiqiang Du,
  • Yi Shen,
  • Yong Zhang,
  • Kuankuan Zou,
  • Peng Xu,
  • Aijiang Yang

摘要

Vegetation Net Primary Productivity (NPP) is a vital indicator of the terrestrial carbon cycle, effectively reflecting vegetation’s carbon sequestration ability. This study analyzes NPP dynamics and their response to LUCC in Guiyang from 2000 to 2020. By combining CASA with LUCC transition and gain–loss analyses and applying a construction-land-based core–edge–rural gradient, it identifies spatial differentiation in NPP along the urbanization gradient and quantifies the contrasting effects of urban expansion and ecological restoration on carbon sequestration. The findings indicate that: (1) Spatially, vegetation NPP in Guiyang exhibits a pronounced gradient, with higher values in the north and lower values in the south and follows a clear pattern of rural > edge > core along the urbanization gradient. (2) Temporally, the intra-annual variation of vegetation NPP exhibits a unimodal (trend peak in July, trough in January). Guiyang’s average annual vegetation NPP (2000–2020) increased at 1.90 gC/m2·a. (3) During 2000–2020, the NPP of cropland, forest, and shrub has generally increased with the rates of 1.97gC/m2·a, 2.23 gC/m2·a, and 5.19 gC/m2·a, while the NPP of grasslands has declined (–2.88 gC/m2·a). (4) LUCC in Guiyang are primarily characterized by a transition from farmland to forest between 2000 and 2020, contributing to a net increase of 31,325.81 tC in vegetation NPP. The research results provide data and theoretical support for ecological management and sustainable urban development strategies that aim to enhance vegetation carbon sequestration efficiency in karst regions undergoing urbanization.