加权森林景观斑块耦合网络节点异质性研究

ccording to the distribution of West Dongting Lake forest, the landscape type is divided into 9 categories, and the coupling network of landscape patches based on the productivity of arbor layer was constructed in the light of edge effect size of arbor layer. Weighted network node heterogeneity is analyzed through the relationship between the heterogeneity indexes of network and the patches. The results showed that: the node degree of the 5 networks, the patch characteristics index was significantly related to the point intensity (absolute value) in thResearch on the node heterogeneity of Forest Landscape Patches Coupling Network Based on Tree layer productivitye 0.01 level (bilateral).Cubic model and Logistic model are used to simulate the relationship among network node degree, patch shape index and point intensity distribution. The result showed that, when the node degree and shape index change within a certain range, the point intensity distribution is concentrated in a very small area; when they reach a certain threshold value, there was obvious discreteness for the point intensity distribution; Very individual nodes have a larger point intensity distribution, and become the core of the whole network. The heterogeneity analysis of network nodes shows that the dominant tree species with the largest heterogeneous nodes in these 5 networks are broad leaved forest, and the smallest the shrubbery. Due to the influence of the size and shape of the patch, the heterogeneity of the nodes is related to the shape index and the node degree,which means the larger the area, the more irregular shape of the patch or the greater the intensity of the node degree, the greater the heterogeneity, and vice versa.