ton per acre

[greenhead carpentry]

Hi Guys,

 

Can anyone tell me the approximate weight per acre for a mature sitka plantation , trees of small saw log diameter

many thanks

Al

[pleasant]

Hi Guys,

 

Can anyone tell me the approximate weight per acre for a mature sitka plantation , trees of small saw log diameter

many thanks

Al

 

how small is small????

[WorcsWuss]

You should be able to estimate this fairly easily.... mark out measure an average area, count how many stems are in it, measure their diameter, guestimate their height and read off their weight from a chart. The multiply it up to 1 acre.

Approx 4050m2 in an acre... measure out 6m x 7m and work out how much timber is in that, times it by 100... 99 is more accurate but close enough...

[NI Tree]

welcome to arb talk greenhead carpentry

 

it is near imposible to say with out knowing anthing about the plantation and carring out some measurments and anyway you would then only know the volume in of the stand but has a denicty of 380 - 450 kg/ m3 at a moisture conttent of 15% but when freshly fell it about 920kg /m3

 

 

also what products you are wanting to obtain as if you brash harvest as well it can increas a lot too.

 

to find the volume you will need to know

 

the dbh and high of the tree

 

volume of an indeval tree = hight X basal area x form factor

 

the basal area is the cross sectional area were the dbh was measured

caculati 1/4 X pie X dbh squared

 

the form factor is the to take it the taper of the tree i would use 0.4

 

ps this is a rough estimate

 

use sample plots of know area (but keep a way from the edge of the wood) as stated above in worcswuss but note this is a rough estamate

Edited January 19, 2012 by NI Tree

[luftwaffe]

A plantation of 40 year old sitka should yield the owner approx 350 ton per hectare (2.4 acres to the hectare), this is taken with the average tree size of 0.38m tree size, but it all depends on the site etc, if the site is at a high altitude ( over 1600 feet) it is likely that the yield will be significantly lower, also take into account has the wood been thinned, and when.

[NI Tree]

that sounds about right

[Sam Thompson]

What is the stocking density?

[luftwaffe]

Another simple but regular mistake people take when averaging weight to hectare is taking into account of the roads-rides in the plantation, Ive seen many woods especially smaller woods with good roads take up quite a percentage of the woods acreage thus lowering the plantations weight to hecterage.

[TimberCutterDartmoor]

What is the stocking density?

 

I was going to say that except change the word "is" for "about"...

[greenhead carpentry]

Thanks guys, sorry for the delay in response but have been working away doing crazy hours, the reason for asking is that ive just purchased 4 acres of wind blown sitka that i was going to sell as fire wood, probably cut and forward it myself stack split and season then sell it,

all this just to feed my weans

thanks again Al