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杉木林速生丰产,受多方面因素影响。只有良种良法,才能达到速生丰产之目的。 1972年春,我们在景宁林业总场鹤溪分场驮岙头营林区营造了杉木速生丰产林、优良母树子代林,并进行了不同整地方式、苗木质量、间伐强度对比试验。结果表明,13年生杉木丰产林,平均树高为9.47米,平均胸径13.9厘米,每亩平均蓄积达13.97立方米,分别比对照高 7.5％、4.4％和13.2％;12年生杉木优良母树的子代林,平均树高11.13米,平均胸径16.2厘米,每亩平均蓄积13.974立方米,加上间伐量5.063立方米,总量为19.037立方米。
Cunninghamia fast-growing, affected by many factors. Only good seeds of good law, in order to achieve the purpose of fast growing. In the spring of 1972, we established the quick-growing and high-yielding fir plantations and the excellent parent tree progeny plantations in the lairongtouying forestry area in Cixi forestry general field of Jingning forestry field and carried out the comparative experiments of different land preparation methods, seedling quality and thinning intensity. The results showed that the average height of 13-year-old Chinese fir plantation was 9.47 meters with an average diameter at breast height of 13.9 cm and an average volume of 13.97 cubic meters per mu, which was 7.5%, 4.4% and 13.2% higher than that of the control respectively. Dai Lin, the average height of 11.13 meters, average diameter of 16.2 cm, average accumulation of 13.974 cubic meters per mu, plus thinning of 5.063 cubic meters, a total of 19.037 cubic meters.