过去的十五年里,林业工作者受到了来自世界银行、联合国粮农组织、国际环境组织及其它有关机构研究报告的严峻挑战,这些报告不断地告诫人们,世界人口的增长,需求的提高将会对现有森林造成巨大的压力,倘若这种趋势持续下去,目前的森林管理水平将很难满足人类不断增长的需求。这些报告指出:世界人口在1975年大约是40亿, For the past 15 years, foresters have been challenged by research reports from the World Bank, the UN Food and Agriculture Organization, the International Environment Organization and other relevant agencies. These reports keep telling people that as the world’s population grows and the demand increases, Given the tremendous pressure on existing forests, if this trend continues, the current level of forest management will hardly meet the growing needs of mankind. These reports point out that the world’s population was about 4 billion in 1975,