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导算树干材积、林分材积和地位指数的估算公式,是黑西哥展叶松(Pinus patula)在其天然分布区确定其生长和收获量的部分工作。数据收集于54种不同林分的162块样地。用Chapman-Richards公式拟合优势高和林龄,获得了一簇同型的地位指数曲线。单株树干和林分材积公式适用的直径范围为15至80厘米。与南非发表的地位指数相比较,墨西哥展叶松由于天然更新而生长衰退,但也有可能是天然群体对非洲的异地栽培的遗传选择,墨西哥与非洲的树干材积公式是相同的。
The estimate of trunk volume, stand volume and status index is part of Pinus patula’s determination of its growth and harvest in its natural distribution. Data were collected on 162 plots of 54 different stands. Using the Chapman-Richards formula to fit the superiority and age of the forest, a cluster of homosexuality index curves were obtained. The diameter of a single trunk and stand volume formula ranges from 15 to 80 centimeters. Compared with the index of status published in South Africa, Zayed pine in Mexico is dwindling due to natural renewal. However, it may also be a genetic choice for the natural populations to cultivate in different places in Africa. The formula for trunk volume in Mexico and Africa is the same.