7Pande P K.Influence of growth,wood anatomical properties and specific gravity on heartwood,sapwood and tension-wood in Dalbergia sissoo Roxb[J].Journal of the Indian Academy of Wood Science, 2013, 10(1):16-21.
8Knapic S,Pereira H.Withintree variation of heartwood and ring width in maritime pine (Pinus pinaster Ait.)[J].Forest Ecology and Management, 2005, 210(1/3):81-89.
9Fleur Longuetaud, Frédéric Mothe, JeanMichel Leban, et al.Picea abies sapwood width:Variations within and between trees[J].Scandinavian Journal of Forest Research, 2006, 21(1):41-53.
10Woeste K E. Heartwood production in a 35yearold black walnut progeny test[J].Canadian Journal of Forest Research, 2002, 32(1):177-181.