邯郸西部生态空间网络结构时空演变及其与固碳功能相关性研究

Spatialtemporal Evolution of Ecological Spatial Network Structure in Western Handan Region and Its Correlation with Carbon Sequestration Function

摘要:

构建生态空间网络是优化区域景观结构、提升生态系统服务功能的常用方法，但对于生态空间网络结构与特定生态系统服务功能间的关系鲜有报道。本研究基于多源遥感数据产品，以邯郸西部为研究区，分析了固碳功能及生态空间网络的时空演变特征，研究了生态空间网络拓扑结构特征与固碳功能之间的相关性。结果表明，2000—2020年间，研究区植被净初级生产力总量平均值为2.17×108 kg/(m2·a)，固碳功能呈上升趋势；研究区生态空间网络整体连接性较高，模块结构明显，不均匀性极强，20年间结构变化趋势显示，网络连接性基本稳定，不均匀性略有升高；研究区节点介数、PageRank、度3个指标与固碳功能之间存在明显的正相关性，其中节点介数相关性最为明显，PageRank和度次之，这3个指标为生态空间网络中节点固碳功能的潜在有效判断指标。研究结果对于生态空间网络构建与优化、区域固碳功能提升具有重要参考价值。

关键词:生态空间网络;时空演变;固碳功能;相关性;邯郸西部

Abstract:

The construction of ecological spatial networks is a common method used to optimize the regional landscape structure and enhance ecosystem service functions. However, the relationship between the structure of ecological spatial networks and specific ecosystem service functions is still rarely explored. Based on multi-source remote sensing data products and with the western region of Handan as the study area, the spatiotemporal evolution characteristics of carbon sequestration function and ecological spatial networks were analyzed, and the correlation between the topological structure characteristics of ecological spatial networks and carbon sequestration function was studied. The results showed that from 2000 to 2020, the average NPP value in the study area was 2.17×108 kg/(m2·a), which showed a significant upward trend. The overall connectivity of the ecological spatial network in the study area was high, with a clear community structure and an extreme level of unevenness. The connectivity of the network was basically stable during the research period, but the heterogeneity was slighted increased. There was a significant positive correlation between the network’s topological indicators and their carbon sequestration function in the study area. Among them, the correlation of node betweenness was the most significant, followed by PageRank and degree. These three indicators may be potential effective indicators for judging the carbon sequestration function of nodes in ecological spatial networks. The research results had important reference value for the construction and optimization of ecological spatial networks and the improvement of regional carbon sequestration function.

Key words:ecological spatial network;spatialtemporal evolution;carbon sequestration function;correlation;western Handan region