| 摘要: |
| 有效规划和管理城市绿色基础设施(UGI)的组成和
结构以维持高水平的UGI碳汇绩效对于节约国家资源和应对气
候变化至关重要。然而目前UGI景观格局对碳汇绩效的影响因
素仍不明确，因此，旨在量化UGI景观格局对碳汇绩效的影
响，为低碳导向下UGI的管理和优化决策提供理论基础。首
先，利用景观指数法对武汉市UGI景观格局进行多尺度量化。
然后使用哨兵2号数据改进的CASA模型、生物量-碳转换系
数评估了多尺度下武汉市UGI的碳汇绩效。并整合莫兰指数和
半变异函数识别了武汉市UGI景观格局和碳汇绩效的本征尺
度。最后，以本征尺度为最佳网格分析尺度揭示了UGI景观格
局对碳汇绩效的关键影响因子。结果表明：1)武汉市UGI碳
汇绩效不存在城乡梯度差异但依然存在空间分异和空间聚集特
征；2)2.5km是最佳网格分析尺度，宜作为低碳导向下武汉
市UGI的最佳管理单元；3)UGI碳汇绩效与耕地、湿地占比
和聚集度呈负相关，而与林地、草地占比和聚集度成正相关，
林地的高连通度也意味着UGI的高碳汇能力。此外，湿地和林
地的形状指数对碳汇绩效也有显著影响。建议在2.5km尺度
下从增加林地占比、构建绿廊、减少冬闲田、碳汇树种选址种
植等方面提升UGI的碳汇绩效。 |
| 关键词: 风景园林 城市绿色基础设施 碳汇绩效 景观格
局 CASA模型 最佳网格分析尺度 |
| DOI： |
| 投稿时间：2022-03-03修订日期：2022-09-16 |
| 基金项目: |
|
| Influence of Urban Green Infrastructure Landscape Pattern on Carbon Sequestration Performance at the Optimal Grid Unit |
| HONG Ge,WU Xuefei,CAI Ruihong |
| Abstract: |
| Effective planning and management of urban green infrastructure
(UGI) composition and structure to maintain its good performance as a
carbon sink is crucial for preserving resources and coping with climate
change. However, the influence of UGI landscape patterns on the carbon
sequestration performance remains elusive. This study aims to quantify the
impact of UGI landscape pattern on the performance of carbon sequestration,
and thus provide a theoretical basis for the assessment and optimization of
UGI under a low-carbon orientation. Firstly, the landscape index was used to
quantify the UGI landscape pattern in Wuhan. Then, the performance of UGI
carbon sequestration in Wuhan was assessed at multiple scales by combining
the Sentinel-2 improved CASA model and biomass-carbon conversion
coefficient. Subsequently, the Moran's I and Semi-variogram models were
integrated to identify the intrinsic scales of the UGI landscape pattern and
carbon sequestration performance. Finally, the intrinsic scale was used as
the optimal grid analysis unit to reveal the key factors. The results show
that: 1) Although there is no urban-rural gradient in the performance of UGI
carbon sequestration performance, there are certain spatial differentiation and
spatial aggregation; 2) 2.5km is the best grid unit for analysis in this paper,
as well as the best management unit for UGI in Wuhan under low-carbon
orientation; 3) The performance of UGI carbon sequestration is negatively
correlated with the proportion and aggregation degree of cropland and
wetland, but positively correlated with those of tree covers and grassland. In
addition, a high connectivity of tree covers also corresponds to a high carbon
uptake ability of UGI. In addition, the shape index of wetlands and tree covers
has great influence on the carbon sequestration performance. It is therefore
recommended that the carbon sequestration performance of UGI can be
enhanced through strategies such as increasing the proportion of tree covers,
establishing green corridors, reducing bare cropland in winter, and rational
planting of trees with high carbon sequestration capability. |
| Key words: landscape architecture urban green infrastructure carbon
sequestration performance landscape pattern CASA model optimal grid
analysis unit |
