随着世界人口的增长和经济的发展,森林生态系统迅速而直接地受到土地利用变化的影响。科技界已普遍认同温室气体的排放是导致全球平均气温升高(1970年至今已升高0.5℃)的主要原因,并改变了世界的水循环(IPCC,2007a)。即使最保守的情况,未来全球平均气温也将升高约2～4℃,将使一些地区明显干 As the world’s population grows and the economy grows, forest ecosystems are rapidly and directly affected by changes in land use. The scientific community has generally agreed that greenhouse gas emissions are the main cause of the global average temperature increase (up to 0.5 ° C since 1970) and have changed the world’s water cycle (IPCC, 2007a). Even the most conservative scenario, the future global average temperature will rise about 2 ~ 4 ℃, will make some areas significantly dry