论文部分内容阅读
杉木是我国特有的用材树种。以往,杉木被认为适宜在丘陵山地的酸性和微酸性土壤上生长,为长江以南的主要造林树种。但自1966年以来我们在苏北灌溉总渠河堤上栽植了近千亩的杉木,现已郁闭成林,长势良好。经调查,进入速生阶段以后的林分,年高生长量大于1米,胸径生长量大于1厘米,每亩年材积生长1立方米以上,达到全国速生丰产的指标,并高于本省宜兴、溧阳山区杉木的生长量,接近中心产区水平。
Chinese fir is a unique timber species. In the past, Chinese fir was considered suitable for growing in acidic and slightly acidic soils in hilly terrain and was the main afforestation species south of the Yangtze River. Since 1966, however, we have planted nearly one-thousand-acres of Chinese fir on the embankment of Northern Jiangsu Irrigation Canal. After investigation, after entering the fast-growing stage, the annual growth rate is more than 1 meter, the DBH growth rate is more than 1 centimeter, and the annual volume per acre is growing more than 1 cubic meter, reaching the index of fast-growing and yielding nationwide, higher than that of Yixing, Liyang Fir growth in mountainous areas, close to the level of central producing areas.