关键词: 活性比率, 活性比率

Abstract:

In order to research the forest landscape pattern and its influence on the diversity of shrubs in the west of Dongting Lake, based on the forest distribution, the author divided the landscape into 12 types and constituted landscape plaques by amalgamating adjacent sub-compartment. What’s more, combined with Shannon-wiener index, the author deduced the edge effects of shrubs as the edge weights to establish the model and coupling network. The results showed that the coupling network had both scale-free and small-world characteristics, for it had a power-law distribution of node degrees. The node degree and betweenness had a positive correlating high order curve, which indicated that the higher node degree, the more importance it was in the net’s connection. What’s more, the older the trees, the higher density and clustering coefficients, so that the stronger stability the network was. It could be learned from Changde forest station that the node strength had a positive value in a total, although some of them had either positive or negative value and this type of landscape pattern distribution would promote the diversity of shrubs.