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在北京市山区选取20块油松标准样地,按照多边形样地布设的原理,在其中布设100块多边形样地进行测量,并对测量所得的样地林分平均树高、平均胸径、平均密度以及蓄积量与标准样地每木检尺数据进行对比分析,得到多边形样地的调查精度。结果表明,多边形样地法调查数据在人工林中精度高于天然林中,人工林中蓄积量精度可以达到92.8%,而在天然林中,蓄积量精度可以达到89.2%。
In the mountainous area of Beijing, 20 standard samples of Pinus tabulaeformis were selected. According to the principle of polygon sample layout, 100 pieces of polygon samples were laid for measurement. The average tree height, average diameter at breast height, average density As well as the comparison between the stock volume and every wooden ruler in the standard sample to get the survey accuracy of the polygon sample. The results showed that the accuracy of polygon sample data was higher in artificial forest than in natural forest. The accuracy of accumulation in artificial forest could reach 92.8%, while in natural forest, the accuracy of accumulation was 89.2%.