(一)林业既是重要的经济建设,又是主要的环境、公益建设。尤其是近年来,森林在提高人类生活质量、保护生物多样性以及可持续发展方面的功能日益被人们所认识。发达的林业,正成为一个国家物质文明、精神文明和环境文明的综合性标志。由于林业具有社会、经济、生态三大效益,因而表现出商业性和非商业性两重属 (A) Forestry is not only an important economic construction but also a major environment and public welfare construction. In recent years, in particular, the function of forests in improving the quality of human life, protecting biodiversity and achieving sustainable development has been increasingly recognized. The developed forestry is becoming a comprehensive symbol of a country’s material civilization, spiritual civilization and environmental civilization. Since forestry has three major social, economic and ecological benefits, it shows both commercial and non-commercial