摘要
利用广东高要和广西扶绥两地14个2～10年生桉树林分样地共287株样木，研究短轮伐期桉树人工林个体林木特征指标，并比较现有广西良种桉二元带皮和去皮材积公式估算个体林木材积的准确性，分析不同年龄、林分和径阶林木的出材率。结果表明：带皮和去皮林木的胸高形数为0．504±0．0042和0．529±0．0044、实验形数为0．410±0．0024和0．427±0．0027、形率为0．657±0．0034和0．690±0．0036、高径比为1．22±0．017和1．43±0．019。用广西良种桉二元带皮和去皮材积公式估算单株林木带皮和去皮材积与实际材积高度相关（r〉0．99），但估算值普遍偏低，平均分别小3．7％和21．0％；尤以用带皮材积公式估算去皮材积比用去皮材积公式估计要准确，平均只小2．3％。如以6年生以上样地和尾径4cm以上的去皮林木为实际出材,5个相关样地林分平均出材率为（73．3±4．31）％，最小为54．6％，最大为81．5％。
Based on 14 plots totally of 287 trees sampled from 2 to 10-year old eucalyptus plantations in Gaoyao, Guangdong and Fusui, Guangxi, this paper investigated： 1 ） the characteristics of short-rotation eucalypt individuals such as breast -height form factor, experimental form factor, form quotient and ratio of height to DBH with and without bark ; 2） the accuracy of two volume equations popularly used to estimate the volumes of individual trees with and without bark, respectively;3） the recovery rate of the individual trees. The means （standard errors） of the breast-height form factor, experimental form factor, form quotient and ratio of height to DBH of eucalypt trees were 0.504 ± 0. 004 2, 0.410 ± 0. 002 4, 0. 657 ± 0. 003 4 and 1.22 ± 0. 017, respectively, for trees with bark ; and 0. 529 ± 0. 004 4, 0. 427 ± 0. 002 7, 0. 690 ± 0. 003 6 and 1.43 ± 0.019, respectively, for trees without barks. Two volume equations examined was highly accurate, but generally underestimated the volume at average rates of 3.7% and 21% for trees with and without barks, respectively. For debarked trees, the volume equation for trees with barks was actually more accurate, underestimating volume at average rate of 2.3%. For sampling plots at age of 6 years or older, the average recovery rate plus standard error of woods with small-end diameter of 4 cm was （73.3±4.31 ） %, ranging from 54.6% to 81.5%. The characteristics of short-rotation eucalypt trees and stands varied over origins of planting materials, ages and cultivation operations. Intensive management including breeding, vegetative propagation and fertilizing may change these individual characteristics, increase wood recovery rate and enhance the efficiency of eucalypt plantations.
出处
《广东林业科技》
2006年第4期17-22,共6页
Forestry Science and Technology of Guangdong Province
关键词
树高
胸径
材积公式
形数
形率
出材率
height, DBH, volume equation, form factor, form quotient, recovery rate of wood
