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以典型抽样法,在泡桐人工林中按大小结构比例抽取50株样木,据样木调查数据拟合干形曲线后,求得树干材积公式,其求积误差仅0.81％。
A typical sampling method was used to extract 50 samples of wood in the paulownia plantation according to the proportion of the size and structure. After fitting the dry curve according to the sampling data of the wood sample, the product formula of the stem volume was obtained. The quadratic error was only 0.81%.