基于改进力导向模型的生态节点布局优化
发布时间：2018-12-12 17:59
【摘要】：在西北干旱半干旱生态脆弱区,构建生态网络可以连接破碎的生境斑块,提高景观之间的连通性。而生态节点的布局优化能够降低能量损耗,增加稳定性,对维持区域生态环境安全稳定具有重要意义。以生态脆弱区典型县域磴口县为研究区,在现有生态网络基础上,改进了HV算法的力导向(force-directed)模型,通过优化生态节点的布局对生态网络进行优化。研究结果表明,在磴口县选取的局部研究区内,与HV算法相比,改进force-directed模型优化的生态节点布局覆盖率达到90.79%,提升了4.08个百分点;平均聚类系数升高至0.071,是未改进HV算法的1.4倍;分布均匀度降低至2.629,比未改进HV算法降低了0.629。通过模型优化使得网络结构清晰、生态节点布局均匀,节点覆盖率更高,表明优化后生态网络结构更为稳定。
[Abstract]:In the arid and semi-arid ecological fragile region of Northwest China, the ecological network can connect the broken habitat patches and improve the connectivity of landscape. The layout optimization of ecological nodes can reduce the energy loss and increase the stability, which is of great significance to maintain the regional ecological environment security and stability. Taking Dengkou County, a typical county in the fragile ecological region, as the research area, based on the existing ecological networks, the force oriented (force-directed) model of the HV algorithm is improved, and the ecological network is optimized by optimizing the layout of the ecological nodes. The results show that in Dengkou County, compared with the HV algorithm, the ecological node layout coverage of the improved force-directed model is 90.79%, which is 4.08% higher than that of the HV algorithm. The average clustering coefficient is increased to 0.071, which is 1.4 times of that of the unimproved HV algorithm, and the distribution uniformity is reduced to 2.629, which is 0.629 less than that of the unimproved HV algorithm. Through the model optimization, the network structure is clear, the distribution of ecological nodes is uniform, and the coverage of nodes is higher, which indicates that the optimized ecological network structure is more stable.
【作者单位】： 北京林业大学精准林业北京市重点实验室;佛罗里达大学地理系;
【基金】：国家自然科学基金项目(41371189) “十二五”国家科技支撑计划项目(2012BAD16B00)
【分类号】：X171
本文编号：2375039
[Abstract]:In the arid and semi-arid ecological fragile region of Northwest China, the ecological network can connect the broken habitat patches and improve the connectivity of landscape. The layout optimization of ecological nodes can reduce the energy loss and increase the stability, which is of great significance to maintain the regional ecological environment security and stability. Taking Dengkou County, a typical county in the fragile ecological region, as the research area, based on the existing ecological networks, the force oriented (force-directed) model of the HV algorithm is improved, and the ecological network is optimized by optimizing the layout of the ecological nodes. The results show that in Dengkou County, compared with the HV algorithm, the ecological node layout coverage of the improved force-directed model is 90.79%, which is 4.08% higher than that of the HV algorithm. The average clustering coefficient is increased to 0.071, which is 1.4 times of that of the unimproved HV algorithm, and the distribution uniformity is reduced to 2.629, which is 0.629 less than that of the unimproved HV algorithm. Through the model optimization, the network structure is clear, the distribution of ecological nodes is uniform, and the coverage of nodes is higher, which indicates that the optimized ecological network structure is more stable.
【作者单位】： 北京林业大学精准林业北京市重点实验室;佛罗里达大学地理系;
【基金】：国家自然科学基金项目(41371189) “十二五”国家科技支撑计划项目(2012BAD16B00)
【分类号】：X171
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