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中国林科院林业研究所在山东莒县搞的杨树速生丰产林中间试验已初步获得成功。目前,仅山东省莒县就已发展杨树速生丰产林9.7万亩,占全县适宜营造速生丰产林面积的95%。据这个县的于家店子村调查,1981年砍伐的6年生健杨(2.4亩),产材16.02立方米,每亩平均产木材6.675立方米。我县与莒县在气候条件上虽有相当差异,但只要在造林时选择好树种、品种,完全可以达到速生丰产的目的。在山东莒县造林是以69杨、72杨、健杨、沙兰杨、Ⅰ214杨为主。我县除69杨、72杨不宜栽培外(69杨、72杨只能在北纬37°以南栽培),其它均可栽培。1983年我们学习山
The Chinese Academy of Forestry Forestry Research Institute in Shandong Pixian poplar fast-growing high yield middle forest trial has been initially successful. At present, only the Shexian County in Shandong Province has developed 97,000 mu of fast growing high-yield poplar, accounting for 95% of the total area in this county. According to the survey of Yudiadianzi Village in this county, the 6-year-old Jian Yang (2.4 mu) felled in 1981 has a production capacity of 16.02 cubic meters and produces an average of 6.675 cubic meters of timber per mu. Although there are quite different climatic conditions in our county and Juxian County, as long as the tree species and varieties are selected during afforestation, the purpose of fast-growing and high-yielding can be completely achieved. Afforestation in Pixian County, Shandong Province, is based on 69 Yang, 72 Yang, Jian Yang, Sallam Yang, and I214 Yang. In addition to 69 Yang County, 72 Yang should not be cultivated (69 Yang, 72 Yang can only be cultivated at 37 ° north latitude), the other can be cultivated. In 1983 we studied mountains