Abstract: This paper defines the meaning of artificial forest stability and its evaluating standards. The various disturbing factors affeCting the stability of Mongolian pine plantation on sandy land were analyzed. Detailed studies were carried out on evaluating the survival degree of planting, the growth, the ability of resisting the adverse circumstances, life length, and the structure and the productivity of forest stand. Results show that the artificial forest stands of Mongolian pine introduced to sandy land are basically stable. The stands bowing on low sand dunes are more stable than those growing on high sand dunes. The young forests have higher disease-resistance than do the middle-aged forests. According to the density and the productivity of it, the stand growing on Honghuaerji sand land is more stable than in Zhanggutai.

Key words: Sandy land, Pinus sylvestris var monglica, Plantation, Stability, eutrophication, biological nitrification-denitrification, biogeochemical process, plant assimilation, eco-hydrological process