Sapwood and heartwood are not isolated compartments: Consequences for isotope ecohydrology

Sapwood and Heartwood

Distribution of terpenes in heartwood and sapwood of loblolly pine

The purpose of this study was to investigate the distribution of terpenes in loblolly pine with respect to the potential impact of volatile organic compound emissions during drying. The total terpene content in the inside, middle, and outside of increment core sections from twelve 40-year-old loblolly pines was determined over a period of 14 months. A method for extracting and analyzing terpene...

Radial patterns of carbon isotopes in the xylem extractives and cellulose of Douglas-fir.

Heartwood extractives (nonstructural wood components) are believed to be formed from a combination of compounds present in the adjacent sapwood and materials imported from the phloem. The roles of local compounds and imported material in heartwood formation could have important implications for the wood quality of species having naturally durable wood. Stable isotope composition (delta(13)C) wa...

Chemical characterization and extractives composition of heartwood and sapwood from Quercus faginea

Heartwood and sapwood of Quercus faginea were evaluated in relation to summative chemical composition and non-polar and polar extracts composition, including an assessment of antioxidant properties (DPPH and FRAP). Twenty trees from two sites in Portugal were analysed. Heartwood had approximately two times more solvent extractible compounds than sapwood (on average 19.0% and 9.5%). The lipophil...

Biodegradability of Extractives in Sapwood and Heartwood from Scots Pine by Sapstain and White Rot Fungi

Wood extractives cause pitch problems in pulp and paper manufacture. Extractives are low-molecular weight lipophilic components in wood consisting mainly of triglycerides, waxes, steryl esters, sterols, free long chain fatty acids and resin acids (Fengel and Wegener 1989a). The deposits of wood extractives associated with fibers, inorganic salts and additives, technically referred to as pitch, ...