Abstract: Canopy interception is one of major components of water balance in forest stand. Each of four major factors affecting canopy interception(I) of Mongolian pine,i. e., rainfall intensity(R_i) and quantity(R_q), leaf area index(LAI) and dry degree of twigs and leaves before raining(Dd), is divided into five levels. Twenty-five experiments are carried out in laboratory on the basis of orthogonal design, and the effects of all factors on interception are analyzed. Among the factors, LAI has the most remarkable effect. Equations are established between I and LAI, R_i and R_q. There is no distinct difference between modeling value and experimental data, and hence, the equations can be used to calculate the interception rates of different Mongolian pine stands.

Key words: Canopy interception, Simulation, Mongolian pine, development scale, planting technology, production standards, organic agriculture, constraint factor.