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杉木生长快,材质佳,用途广,林分生产力高,为国东南部湿润亚热带最重要的用材树种。阜宁县堤管所自1966年开始引种杉木,在无产阶级文化大革命的推动下,破除迷信,解放思想,十年来,在总渠河堤上以杉木更新刺槐,营造杉林千余亩,大部分已郁闭成林,由于河堤生境条件优越。幼林郁闭后,随着树龄增长,要求营养面积不断增大,林木个体之间逐渐发生矛盾,如不及时采取间伐措施,清除部分林木,将影响林木生长速度及木材的产量与质量,甚至不能达到成材的目的。 为了促进杉木速生丰产,提高林分的生产力,并起到生产示范作用,我们于1974年7月,设置了间伐试验区,分为三个小区,8年半生每亩保留株数114株,间伐强度34％ （没有对照区）,5年半生每亩保留株数300株,间伐强度36％及其对照区,每亩株数480株。每小区面积为半亩。现将间伐一年半后所得结果,进行整理小结,备供参考,并请批评指正。
Cunninghamia lanceolata grow fast, good material, wide use, stand high productivity, wet southern subtropics of the most important timber species. Since its establishment in 1966, Funing County embankment pipe has introduced Chinese fir plantations. Under the impetus of the Great Proletarian Cultural Revolution, it has eradicated superstition and emancipated the mind. Over the past ten years, most of the cultivated cedar forests have been rehabilitated with acacia and Chinese fir trees, Closed forest, due to river embankment habitat conditions. After the young canopy is closed, with the increase of the tree age, the nutrition area is required to increase continuously. There are contradictions between the individual trees gradually. If not, the removal of some trees will affect the growth rate of the tree and the yield and quality of the wood, To achieve the purpose of getting stuffed. In order to promote Chinese fir fast-growing and high yield, improve productivity and play an exemplary role in production, we set up in July 1974, thinning test area is divided into three small areas, 8 and a half-year reserve of 114 plants per acre, 34% (no control area), 300 plants per mu in five-and-a-half years, 36% thinning intensity and its control area, 480 plants per mu. Each plot area of half a mu. Will now cut the results obtained after a year and a half, to organize summary, for reference, and please criticism.