三次样条函数在树干材积测算中的应用  

Application of cubic spline function in volume measurement

作　　者：温小荣[1] 钟育谦 赵德海[1] 

机构地区：[1]南京林业大学,江苏南京210037 [2]江苏省森林资源监测中心,江苏南京210036

出　　处：《江苏林业科技》2004年第6期8-9,21,共3页Journal of Jiangsu Forestry Science & Technology

摘　　要：主要介绍了三次样条函数拟合树干曲线测定树干材积的方法。以水杉的实测资料作为算例,与常规的区分求积方法进行比较分析,结果表明:当采用2m区分段区分求积时,在不增加区分段数(不增加额外的外业工作量)情况下三次样条函数区分求积法,要好于中央断面积区分求积法,采用三次样条函数区分求积法测算树干材积能有效地提高求积精度,具有较好的应用价值。A method of cubic spline function in imitating stem curve and sectional measurement by volume was introduced in this paper.Compared with the conventional method of sectional measurement,the number of the stem sections has greater influence upon the sectional measurement by means of Smalian's formula than of cubic spline function in the case of metasequoia material.Especially when the number of stem sections was decreased,the sectional measurement by means of cubic spline function can offer higher relative precision than that by Smalian's formula.The result indicates that the volume measurement precision can be effectively improved,which is important for volume measurement in practice.

关 键 词：三次样条函数 区分求积法 树干曲线 

分 类 号：S758.1[农业科学—森林经理学]