基于六株木法的杉木蓄积量估测研究

蓄积量是森林资源调查和监测的重要指标。本研究以湖南省攸县黄丰桥林场杉木树种为研究对象,采用随机抽样方法布点,共布设样地110块,其中杉木有效观测样地97块。样地内调查以距离样地中心位置最近的6株木为对象,观测每株杉木的胸径、树高及最远杉木到样地中心的距离,并计算这6株杉木样圆的覆盖面积,来估测样地蓄积量。结果表明：在95%的可靠性下,平均胸径估测精度为90%,平均树高估测精度为88%,蓄积量估测精度达89%,说明利用六株木法估测杉木蓄积量具有较好的效果。

A study of the estimation of China fir forest storage volume by use of the six trees method

Forest storage is an importance index of forest inventory and monitoring.This research focuses on China Fir,and the research area is Huangfengqiao Farm which is located in Youxian,Hunan Province.During surveying,110 plots were set randomly,97 of them were effective.The survey of every specific plot included selecting 6 trees nearest to the central position,measuring the DBH,height,and the distance from the farthest one of the 6 trees to the central position.Then the covering area of these 6 trees was calculated on the basis of these original data in order to estimate the forest storage of these plots.The results have indicated that the estimated precision of average DBH and height are 90% and 88%,respectively,and the forest storage is 89%,under the condition of 95% confidence level.Therefore,the 6 trees method is an effective way to estimate the storage of forest.