不同人为干扰对草原植物与群落净初级生产力的影响

通过对内蒙古草原植物和群落的研究，探讨了火烧和放牧等人为干扰对草原净初级生产力的影响，从能量的角度得出并验证了以下结论：１． 长期过度放牧使绝大多数植物个体发育受到明显抑制，单位重量含能值降低，植物与群落的初级生产力也显著降低．２． 轻度放牧可以刺激植物的补偿性生长，群落的生物多样性增加，并使其初级生产力保持稳定．３． 火烧能有效提高群落净初级生产力，但在整个群落水平上频繁火烧与一次火烧差别不大

The Effects of Different Human Disturbance on Net Primary Productivity of Plant and Community in Steppe

By studying to plant and community of Inner Mongolia steppe, The paper discussed the effects of human disturbance included fire and graze on net primary productivity of steppe, obtained and verified the below results from the energetic point of view:1) The long term over grazing restrained obviously the individual development of most of plant species, decreased its the calorie value per unit weight, and also decreased obviously the net primary productivity.2) Light grazing could stimulated the compensative growth of plant, make the biodiversity of community increased, and make its primary productivity kept steady.3) Burning could promote effectively the net primary productivity of community, butthere was not obvious difference between frequent burning and once burning as far as the whole community level.