Abstract: The three-hundred years dynamic growth process of the unmanaged stands of uneven-aged mixed forest with different primary densities and diameter distributions in Changbai Mountain was predicted with matrix model.The stand densities,basal area and stand harvest with different management projects during 300 yr were compared,in which the diameter limit included 70,60,50 and 40 cm,and the cutting cycle included 10,20 and 30 yr.The results showed that whatever the initial state was,after about 200 years,the changes of the unmanaged stand became quite stationary,and diameter class structure and basal area would achieve an approximately equal steady state.The management regime which the diameter limit was 60cm,and the cutting cycle was 20 yr was the best.The changing rules of various factors in different management regimes were exposited.

Key words: Oryza sativa, Root exudate, Allelopathy, Allelochemicals