杨树二元立木材积表的编制

据不完全统计,杨树人工林全国共有114.8万ha,为能进一步提高杨树经营管理水平,编制杨树二元立木材积表已成为当务之急。作者利用从1981年起经过5a时间测定与收集16个树种共6383株实测样木资料,编制了12个杨树二元立木材积表,供生产、科研工作应用。

THE ESTABLISHMENT OF BINOMIAL STOCK VOLUME TABLES OF POPLAR

Practical measurement of 6 383 collected poplar cores from all of the poplar cultural areas in China has been conducted. After analysis of breast-height form-factor of various poplar stocks, the author divided them into 12 tree species groups. After the calculation of volume variation coefficient of each poplar tree species group, according to the equation n= t2C2/E2 the author analysed the required number of cores necessary for the establishment of volume tables and tried to establish them with 5 regression equations,then applying the residual standard deviation, coefficient of correlation and systemic deviation to test them and select the most suitable equation to establish the binomial stock volume table of Populus tomentosa, P.X canadensis, P. beijingensis, P. nigra, I-72/58,I-69/55, I-63/51, P. X euramericana Guinier cv. "Sacrau", P.X euramericana Guinier cv. "Robusta",P. taiging, P. X xiaozhuanica, P. purdomii, P. alba and P. alba var. pyramidalis. These tables have widely been used with good results.