速生树种是指在适生的立地条件下,经过采取适当的整地、造林、保护和抚育等方面的技术措施,其平均年生长量至少达每公顷10立方米的那些树种。目前对发展中国家人工林营造方面的研究和分析还很粗略,许多细节问题都有待进一步调查和研究。尽管实际数据不足,但已可看到速生树种人工林预期的经济效益。由于造林工作的巨大的间接利益和社会意义是无法用数字来表示的,所以仅能说文章中所做的各种判断 Fast-growing species are those species whose average annual growth is at least 10 cubic meters per hectare, under appropriate habitat conditions, through appropriate measures of site preparation, afforestation, conservation and tending. At present, the research and analysis of the plantation in developing countries is still very rough, and many details are subject to further investigation and research. Although the actual data is not enough, the economic benefits expected from fast growing tree plantations have been observed. Since the great indirect interests and social significance of afforestation can not be expressed by numbers, we can only say that various judgments made in the article