http://www.gissky.net- GIS空间站

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设样地110块,其中杉木有效观测样地97块.以距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,以计算这6株杉木样圆的覆盖面积来估测样地蓄积量,并将估测结果与角规测树法进行对比分析.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%,估测结果与角规测树法所得结果十分接近,表明利用六株木法估测杉木蓄积量具有较好的效果. 更多还原

【Abstract】 This research focus on Cunninghamia,and takes Huangfengqiao Farm in Youxian county,Hunan province as the research area.During surveying,110 sample plots were set randomly,97 of them are effective.The survey of every specific plot includes selecting 6 trees nearest to the central position,take DBH,height,and the distance from the farthest 1 tree of the 6 to central position.Then calculating the covering area of these 6 trees based on the original data,to estimate the forest storage of these plots... 更多还原