摘要
实验形数具有正形数不受树高影响及胸高形数测算容易的特点，并且同一树种在较小区域和较大区域的林木株数，按实验形数级的分布状态基本一致。但从实验形数的变动幅度上讲，在较小区域和较大区域内是有很大差别的。研究结果表明：林分平均直径，平均树高基本相同时，在较小区域内实验形数的变动幅度为0．32-0．47，极值差为0．15，而在较大区域内实验形数的变动幅度为0．23—0．47，极值差为0．24。
The experimental form factors have the advantages of the normal form factor being not affected by the tree height and breast - height form factor easily measured. In smaller area and larger area , stem number of the same species has the distributed state in substantial agreement by the variation of experimental form factor. But there is a great difference between their experimental form factors. The reseach results show that when the diameter and tree height are almost the same , the variation of experimental form factor is 0.32 - 0.47 and the extremum difference is 0.15 in minor area ,but the variation of experimental form factor is 0.23 - 0.47 and the extremum differences is 0.24.
出处
《河北林果研究》
2006年第1期33-36,共4页
Hebei Journal of Forestry and Orchard Research
关键词
实验形数
变动幅度
桦树
experimental form factor
variation range
birch
