Density regulation of explosive population growth in Oxalis corymbosa;

a thorough understanding has not been made clear about the ecological iucchanism of explosive population growing in new flora.

Rain and wind interfere with natural population development of Macrosiphum avenae(Fabricius)

Oscillation of solutions of a delay population model;

Permanence for the "food limited" discrete population model with feedback control and delay;

Stability study is made for the positive equilibrium of a nonlinear age structured population model by constructing two systems for comparison and using the comparison principle, necessary and sufficient conditions are obtained for the global stability of positive equilibrium.