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杉木是我省的主要速生用材树种,在人工林中占首位。每年造林三十万亩左右,但生长量低。据浙江省林业勘察设计院提供的资料,全省杉木每公顷年平均生长量仅0.244立方米(每亩0.16立方米)。为提高商品材基地建设的经济效益,现在林业行政部门以每亩100元的投资规划营造杉木速生丰产林。如果仅从改善栽培条件考虑,增产是有限的。
Cunninghamia lanceolata is the main species of fast-growing timber in our province, occupying the first place in the plantation. Annual afforestation about 300000 acres, but the growth is low. According to the information provided by Zhejiang Forestry Investigation and Design Institute, the annual average growth of Chinese fir per hectare is only 0.244 cubic meters (0.16 cubic meters per mu). In order to improve the economic benefits of the construction of the commodity timber base, the forestry administrative department now plans to build the fast growing and high-yield fir plant with an investment plan of 100 yuan per mu. If only from the improvement of cultivation conditions, increase production is limited.