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#1
08-06-2008, 04:25 PM
 Unregistered Guest Posts: n/a
m3/ha converted to tonnes

hi there, could any one help me with this conversion. its for tree mass, i need to convert m3/ha to tonnes and am finding it very difficult. is density a factor?
thank you
#2
08-07-2008, 03:50 AM
 JohnS Moderator Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,536 Rep Power: 19
Re: m3/ha converted to tonnes

Quote:
 Originally Posted by Unregistered hi there, could any one help me with this conversion. its for tree mass, i need to convert m3/ha to tonnes and am finding it very difficult. is density a factor? thank you
Yes, trees have widely different densities. For wood (dried for use as lumber) densities can range from 0.2 g/cm³ for bamboo to 1.3 for lignum vitae. For more reasonable species, 0.7 g/cm³ might be a VERY rough estimate.

For fresh cut trees, the sap will likely make a difference. But if your tree floats, it is less than 1.0. Note: All of the g/cm³ figures are also t/m³.

I think as a minimum, you would need a density from a reference book or by sample measurement for each species, and an analysis of what species composition is on the property. There may be some industry guideline, but I don't know of them.
#3
10-23-2011, 12:34 AM
 Unregistered Guest Posts: n/a
m3/ha

What does it mean m3/ha ?? it is stand for want any one can reply
#4
10-23-2011, 03:16 AM
 JohnS Moderator Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,536 Rep Power: 19
Re: m3/ha

Quote:
 Originally Posted by Unregistered What does it mean m3/ha ?? it is stand for want any one can reply
The three should be a superscript. It means cubic meters per hectare. The 3-superscript can be represented in special symbols, m³/ha, but a lot of people just type it after the unit, or use a caret, m^3/ha.

It might be suitable for volumetric yields such as timber mass or for irrigation water requirements, as examples. (25 mm of water would require 250 m³/ha)

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