Study on the mathematical model of population of Korean pines with mouse class function;

The saddlenode bifurcation for a kind of nonlinear mathematical model of threedimensions for the population of Korean pines with mouse class function was discussed, and calculation formula and analysis for the periodic solution of Hopf bifurcation were given detailly.

Study on the effect of light penetration tending on plant diversity of Korean pine forest communitiy with "planting coniferous trees and protection broad-leaved trees" in Zhangguangcai Mountains

Dynamic changes of Korean pine forest resources in Heilongjiang Province.;

Ecological literatures on Korean pine forest in China;

The results showed that using the indices of diversity and evenness of the vegetation under forest communities,the total diversity order was Primary Korean pine forest>larch plantation>Acer-Korean pine forest>broadleaf-Korean pine forest>spruce-fir-Korean pine forest>Korean pine plantation>Tilia amurensis-Korean p.

Management of Pinus koraiensis fruit forest and forecasting to the industrial development;

There are three ages of Pinus koraiensis fruit forest after thinning which is 15years old,25years old and 35 years old,three different reserve densities,three repeated samples and seed yielding quantity of these trees was inspected during the 5 years continually.