森林生态系统对于维持陆地生态平衡具有重要作用。研究结果证明 :在当前大气CO2 浓度增加的因素中 ,森林面积减少约占所有因素和作用的 30 %～ 5 0 %。森林在控制全球变暖 ,防洪保土、防风固沙、满足人类健康和精神需求方面同样发挥着巨大的作用 Forest ecosystems play an important role in maintaining the ecological balance of land. The results of the study show that in the current increase of atmospheric CO2 concentration, the forest area reduction accounts for about 30% ~ 50% of all the factors and effects. Forests also play a huge role in controlling global warming, preserving flood control and soil conservation, windbreak and sand fixation, meeting human health and spiritual needs