Forest Mensuration. Brack and Wood
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Tree volume estimation:
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Fluid displacement is a highly accurate, costly and highly specialised method for determining stem volume but it is not applied in routine mensuration practice. Fluid displacement is used occasionally in research when a high level of accuracy is required.
Essentially, the tree stem is cut into sections and each section is placed in a large water bath. The volume of water displaced by a section equals the volume of that section and the sum of the volumes of all sections equals the stem volume.
http://online.anu.edu.au/Forestry/mensuration/FLUIDEDI.HTM
Cris.Brack@anu.edu.au
Mon, 14 Apr. 1997