东北地区天然水曲柳地位指数表和立地形表的编制

Establishment of Site Index Table and Site Form Table for Natural Fraxinus mandshurica in Northeast China

在东北三省调查水曲柳临时样地198块,收集234株优势木数据和19株解析木数据,通过对查数年龄木芯的严格筛查,剔除了被压木,确定用于编表的数据845组。用9个函数式对水曲柳的年龄与优势木高、胸径与优势木高分别进行模拟,通过相关系数和剩余标准差的比较,选择了理查德函数式作为导向曲线模型。地位指数级14~30 m,级距2 m,用相对树高法展开曲线簇。经过相关系数检验、X^(2)检验和落点检验,地位指数表与立地形表符合要求,立地形精度更高。通过木芯年轮的疏密来筛选优势木,可有效地提高立地形表精度。

The data of 234 dominant trees and 19 analytic trees from 198 sample plots in natural Fraxinus mandshurica forest in Northeast China were collected.After ruling out suppressed trees when checking number of the annual ring,845 data sets were used to establish site index table and site form table.The relation between the age and the height of the dominant tree and the relation between the diameter at breast height and the height of the dominant tree were simulated with 9 functions respectively.After comparing the correlation coefficient and residual deviation,the Richard function was selected as the guiding curve model.The site index ranged from 14 m to 30 m with the distance of 2 m.The curve cluster was expanded by relative tree height method.Through the correlation coefficient test,X^(2) test and falling point test,the site index table and the site form table met requirements,and the precision of the site form was higher.The precision of the site form table could be effectively improved by selecting dominant trees through the density of the annual ring.