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五十年代末六十年代初,在我县东部、东南部丘陵岗地营造了刺槐、枫杨、侧柏用材林2万多亩.因立地条件和树种选择不当,目前林木普遍老化,表现为:树皮灰白,苔藓密布,侧枝丛生;主干干枯;地上不成林,地下根成网;春季一时青,夏季一片黄,是典型的低产林分(图1).为了总结经验,更好地搞好低产林分的改造工作,1981年我们对立地条件较差,又具有代表性的踢球山林场低产林分改造情况进行了调查,以便为因地制宜的按照客观规律发展林业生产提供依据.现报告如下:踢球山林场于1959年建立,刺槐、枫杨、侧柏为主要造林树种,因老化,十几年来,已多次进行改造.现有林地面积6500亩,其中黑松3000亩、侧柏1900亩、白蜡233亩,尚待改造的刺槐、侧柏低产林
In the late 1950s and early 1960s, more than 20,000 mu of acacia, Chinese maple and oriental arborvitae forests were planted in hilly areas in the eastern and southeastern parts of the county, due to the lack of suitable site conditions and tree species. At present, the trees are generally aged, showing as follows: Gray, white moss, collateral tufts; trunk dry; on the ground is not a forest, underground roots into a network; spring and summer, a summer yellow, is a typical low yield stand (Figure 1) .In order to sum up experience, In 1981, we conducted a survey on the condition of low-yielding forest stand rebuilding in a poorly-located and representative Kick-off Forest Farm so as to provide the basis for the development of forestry production in accordance with objective laws according to local conditions. The report is as follows: Kickball Hill Farm was established in 1959, and Robinia pseudoacacia, Maple Populus and Platycladus orientalis are the main afforestation species. Due to aging, they have been renovated many times in the past ten years. The existing forest land area is 6,500 mu, of which 3,000 mu is Pine and 1800 Mu, 233 acres of white wax, yet to be transformed Robinia pseudoacacia, arborvitae low yield forest