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在我场泡桐(主要是兰考桐,Paulowniaelongata)片林中。发现同一块地,同样株行距,同样管理措施下的林分,林木生长却表现出明显的不同。有的生长旺盛、粗壮、高大;有的低矮、细弱、形成了小老树。为了寻找其差异的主要原因,我们于1982年下半年进行了调查,认为小老树形成原因与土壤容量因素和质量因素有着密切的关系。 现将调查结果报告于下: 一、林分基本情况及调查方法 泡桐片林位于朝冠分场场南,共3个小班。1小班,63.5亩,株行距3×6米,1976年春造林;2小班,75.9亩,株行距3
In my field Paulownia (mainly blue Paulownia, Paulowniaelongata) film forest. Found the same piece of land, the same line spacing, the same management measures of the stands, tree growth has shown significant differences. Some grow strong, stout, tall; some low, thin, forming a small old tree. In order to find the main reason for its difference, we conducted a survey in the second half of 1982 and concluded that the reason for the formation of small old trees is closely related to the factors of soil volume and quality. Now the survey results are reported below: First, the basic situation and survey methods Paulownia forest located in North Korea sub-sub-field, a total of three small classes. 1 small class, 63.5 acres, spacing 3 × 6 meters, spring planting in 1976; 2 small classes, 75.9 acres, spacing 3