论文部分内容阅读
利用大苗营造护田林带的生产试验是从1957年开始的。从1957到1959,防护林大苗造林的面积共计在600公顷以上,普及到俄罗斯联邦、乌克兰及北哈萨克斯坦三十一个州的200个林场。全苏森林改良土壤科学研究所对各林场的试验每年都进行总结和统计。该所共占有三十个州及边区的162个林场的详细资料(面积共364公顷)。现将大苗造林的资料介绍于下:苗木:大苗的年龄和规格是不统一的。速生树种
Production trials using large seedlings to nurture the forest belts began in 1957. From 1957 to 1959, a total area of more than 600 hectares of shelterbelt afforestation reached 200 forest farms in 31 states of the Russian Federation, Ukraine and northern Kazakhstan. The All-China Forest Research Institute of Soil Science tests and tests the various forest farms every year to sum up and statistics. The site contains a total of 162 forest farms in thirty states and boroughs (covering a total area of 364 hectares). Now the information on the seedling afforestation introduced in the next: Seedlings: the age and size of the seedlings is not uniform. Fast growing tree species