| [spatial structure of quercus mongolica forest in beijing songshan mountain nature reserve]. | based on the survey data of a 0.6 hm2 plot in songshan mountain nature reserve, and by using the uniform angle index, neighborhood comparison and mingling degree, this paper analyzed the spatial structural characteristics of quercus mongolica forest in the reserve. there were 10 populations in the tree layer of the forest, among which, q. mongolica had the obvious advantage in population density and basal area, being the dominant and constructive species of the tree layer. the average mingling d ... | 2009 | 19947196 |