Prediction of Tree Sapwood and Heartwood Profiles Using Pipe Model and Branch Thinning Theory

18118 9 98325 4 302316 document 98325 tpac065.pdf application/pdf e6031b54ec3aad2717a4a8eb0ee67258 MD5 858989 2022-07-19 12:06:38 https://pure.iiasa.ac.at/id/eprint/18118/1/tpac065.pdf 18118 1 1 application/pdf text en public cc_by_nc_4

tpac065.pdf

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http://eprints.org/relation/isVersionOf https://pure.iiasa.ac.at/id/document/98325 http://eprints.org/relation/isVolatileVersionOf https://pure.iiasa.ac.at/id/document/98325 http://eprints.org/relation/issmallThumbnailVersionOf https://pure.iiasa.ac.at/id/document/98325 archive 353 disk0/00/01/81/18 2022-07-19 12:08:02 2023-07-15 03:00:03 2022-07-19 12:08:02 article show Aye T.N. Brännström Å. 8085 Carlsson L. Prediction of Tree Sapwood and Heartwood Profiles Using Pipe Model and Branch Thinning Theory pub ASA CAT EM Huber value; branch thinning model; heartwood; pipe model; sapwood; trunk model Estimates of tree heartwood and sapwood profiles are important in the pulp industry and for dynamic vegetation models in which they determine tree biomechanical stability and hydraulic conductivity. Several phenomenological models of stem profiles have been developed for this purpose, based on assumptions on how tree crown and foliage distributions change over time. Here, we derive estimates of tree profiles by synthesizing simple pipe model theory of plant form with a recently developed theory of branch thinning that from simple assumptions quantify discarded branches and leaves. This allows us to develop a new trunk model of tree profiles from breast height up to the top of the tree. We postulate that leaves which are currently on the tree are connected by sapwood pipes while pipes that previously connected discarded leaves or branches form the heartwood. By assuming that a fixed fraction of all pipes remains on the trunk after a branching event, as the trunk is traversed from the root system to the tips, this allows us to quantify trunk heartwood and sapwood profiles. We test the trunk model performance on empirical data from five tree species across three continents. We find that the trunk model accurately describes heartwood and sapwood profiles of all tested tree species (calibration; $R2$: 84-99%). Furthermore, once calibrated to a tree species, the trunk model predicts heartwood and sapwood profiles of conspecific trees in similar growing environments based only on the age and height of a tree (cross-validation/prediction; $R2$: 68-98%). The fewer and often contrasting parameters needed for the trunk model, makes it a potential useful complementary tool for biologists and the foresters. 2022-11-08 published Oxford University Press (OUP) doi:10.1093/treephys/tpac065 39 public Tree Physiology 42 11 2174-2185 TRUE 1758-4469 no info:eu-repo/semantics/article