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以桉树、杉木、马尾松、落叶松及樟子松等为对象 ,利用样地调查资料 ,结合已有研究成果 ,对造成我国人工林生产力低下的多种自然因素 ,进行了系统地分析研究。结果表明 ,按人工林现实分布格局及立地质量水平 ,全国人工林气候—立地生产潜力 (材积 )平均为 8 6m3 hm2 ·a ;现有人工林由于大面积幼龄林的存在 ,所带来的生产力总体水平下降的幅度为 31%～ 35 %。
Using eucalyptus, Chinese fir, masson pine, larch and Pinus sylvestris var. Mongolica as research objects, this paper systematically analyzed and studied many natural factors which caused the low productivity of Chinese plantations, using the sample survey data and the existing research results. The results showed that according to the distribution pattern of actual plantation and site quality, the average potential of climate-site production (planta) of plantation in China was 8 6 m 3 · hm 2 · a. The existing plantation forest due to the existence of large-scale young forest The overall level of productivity decreased by 31% to 35%.