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Clarksburg Harvest Practices
So, when we compare the 3PG model to the actual production we can look at a number of parameters for comparison:
- Biomass - Stems, and foliage (wet and Dry)
- Total Number of main stems;
- Stem Height
- DBH and Basal Diameter
Per Jesus? The inventory is completed in Clarksburg. They have done the inventory of tree heights, and DBH diameters. Some of the trees have been harvested. By January and Feb, they will do the biomass trial. They will do some regression equations with. They will do the same for Pilchuck and Jefferson,
These are inventory for some of the trees.
They got green weights for 30 trees per clone, and the wood samples from 3 trees, Total green weight; For the research Trials ~ regression equation? 8 12 tree plots for each, Of the 30 they took 3 from for the moisture equations.
Have yet to do the sampling in There about 3 trees per clone. T
Harvest is done in November, Biomass trials will be completed in
Large clone block metrics, they will get a net green weight per clone for the harvest plots. In Clarksburg there is not scale. The material will be arranged by clone, and then later when the harvest is determined by moisture, and then they will be weighed, and then they'll weigh what they delivered by clone.
There is going to be a complete time and motion study at Clarksburg.
Put some LAI traps? Brian will be down on the 22nd at Clarksburg, Davis on 23rd and 24th.
We are currently using a volume index ( Dia^2 * height) as the allometric relationship for determining the fractions that go to stem and foliage. This has a pretty large affect on the biomass predictions of the trees. We use one set of relationships from 4 that were reported on some studies in FR.
The 3PG model basically assumes uniform trees, we should probably do two things;
- Allow the model to report out the estimations in a per-tree units;
- See how a PDF over VI (for example) affects predictions, and if it's closer to the results we will see.
- stump height
- Basal Diameters
I wonder if it's possible to take a picture, from nadir of each post harvested stump. We might be able to then use some simple image processing to get the (near) basal diameter of all the stems. One thing I haven't seen in studies that report the number of stems are statistics about the distribution of the diameters of each stem, and can have a big impact on the models' prediction (basically, the model will predict more foliar biomass for more stumps, and this will be through the first year and maybe longer)
This is something we could potentially do with cell phones and some collection software (like Open Data Kit). Maybe we can try and take that task on?
Leaf Area Index - This is predicted by the model, and is a function of the predicted Foliar biomass. I think we can provide this measurement; hopefully in late October?
It would be nice if we could get a simple surrogate for taking lots of measurements. Again, I wonder if we can photograph the trees right as they start to green up, and then maybe beyond, from like a standard pole height, and see if we can correlate to LAI, and maybe even Volume Index.