Abstract: The internal mechanism between the ecological diversity and stability has been a research hotspot. Based on the theory of complex networks, considering the species as a node, prey relationships among species as directed edges, prey on dependent predation among species as edge weight, the directed and weighted complex networks of food web are constructed in a specific broadleaved mixed forest ecosystem. Under the condition of randomly or selectively removing network nodes, the diversity and stability of system is calculated using related indicators and the correlation between them is studied. The result shows that in the broadleaved forest ecosystem, the loss of a particular species reduces the biodiversity and influences the balance of energy supply and demand in the ecosystem, causes the change of related species’ life habits, then increases the strength of predation on other species which makes the originally stable feeding relationship gradually broken. The constant rupture of prey relationships between species finally prompts the decline of the stability of the ecosystem. As a result, in the broadleaved mixed forest ecosystem, the loss of ecological diversity will reduce the stability of the system, and the diversity and stability is positively correlated.

Key words: soil microbe, afforestation, phenolic acids, coal-mining depressed land