Study on inheritance and variation of wood basic density of Populus tomentosa Carr. clones.
The wood basic density of about 100 Populus tomentosa clones grown in 4 clone testing plantations located in Hebei, Henan, Shandong and Gansu provinces was tested and its inheritance and variation among clones and sites studied. Average wood basic density of the clones was 0.4363 g/cm3, with significant differences among clones and sites. The high value of clonal repeatability (0.82-0.91) indicates that wood basic density is under strong genetic control. Correlation analysis shows that a general negative correlation exists between growth traits (including diameter at breast height, height, and volume) and wood basic density, although the correlation coefficients vary to a certain degree from one site to another.