利用世界银行贷款营造速生丰产林初探王有义（岫岩县林勘设计队）从自然地理、林业生产与经济等方面的调查分析，论证了蛐岩县利用世行贷款，营造以日本、长白落叶松为主的速生丰产用材林的重要性和必要性。在对土壤、植被及树种生长调查的基础上，进行造林经营设计。通过... Preliminary Exploration on Making Fast-growing and High-yielding Forests by World Bank Loan Wang Youyi (Xiuyan Forest Survey and Design Team) This paper demonstrates the use of the World Bank loans in Jiyan County for the investigation and analysis of natural geography, forestry production and economy. Based on the fast-growing high-yield timber importance and necessity. Based on the survey of the growth of soil, vegetation and tree species, design afforestation management. by...