THE ESTABLISHMENT OF BINOMIAL STOCK VOLUME TABLES OF POPLAR

Practical measurement of 6383 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.× canadensis,P.beijingensis,P.nigra,I-72/58,I-69/55,I-63/51,P.×euramericana Guinier cv."Sacrau",P.× euramericana Guinier cv."Robusta",P.taiging,P.×xiaozhuanica,P.purdomii,P.alba and P.alba var.pyramidalis.These tables have widely been used with good results.