世界森林生态系统包括热带、亚热带、温带森林,北方针叶林以及其他有林地。由于人类社会经济活动,森林生态系统遭受了规模巨大的损失,表现出非完整性特征,并使森林火灾发生的频数增加,强度加大。目前全球有60%多的森林面积受到人类经济活动的干扰和影响,工业化国家绝大部分的森林是处于“半自然”状态下,或转变为人工林,发展中国家森林覆盖率下降,从而改变了森林生态系统提供的商品和服务。 The world’s forest ecosystems include tropical, sub-tropical, temperate forests, northern coniferous forests and other wooded land. Due to the economic activities of human society, forest ecosystems suffered huge losses, showing non-integral features and increasing the frequency of forest fires and their intensity. At present, more than 60% of the world’s forest area is affected and affected by the economic activities of mankind. Most of the forests in the industrialized countries are in a “semi-natural” state or transformed into plantations, and the forest cover of developing countries is declining, thus changing The goods and services provided by forest ecosystems.