1985年—1987年,北京林业大学造林教研室采用标准地实测法,平均标准木法,可见半面树冠球果估测法和球果切开法等四种方法进行了油松侧柏林木种实产量予测的研究。研究结果表明:1.对侧柏种实产量进行予测,以平均标准木法与实测误差较小,(土8.1—18.5%),其主要原因是侧相林相 1985-1987, Beijing Forestry University Afforestation and Research Office using standard methods of measurement, the average standard wood method, we can see the half crown cones estimation method and the coniferous cut method four methods of P. tabulaeformis wood yield Predict the study. The results showed that: 1. The yield of Oriental Arborvitae was measured, with the average of the standard wood method and the measured error is small, (8.1-18.5% soil), the main reason is the lateral forest phase