We are going to look at the SimForest glassbox simulation Equation Editor:
http://ddc.hampshire.edu/simforest/software/docs/eq-editor-tutorial.html
Wednesday, May 28, 2008
Netlogo Simulation
Irena,
Please upload the latest version of the Netlogo simulation on the YSU MRO-W webpage.
Please upload the latest version of the Netlogo simulation on the YSU MRO-W webpage.
Monday, May 26, 2008
Manipulating Equations
These are the equations that I want to try to manipulate, in order to simulate beech bark disease:
AGE = (age(treetable)+1.0)
DIAMETER = (diameter(treetable+growth)
GROWTH = (limiting factors x maximum potential growth)
LIMITING FACOTRS = (light factor x site quality)
Beech bark disease appears to affect trees that have high nitrogen levels more then trees that do not. Beech trees of Zoar Valley would most likely have high nitrogen levels, based on a paper I read that stated that trees in old growth areas (these systems are more productive) have higher nitrogen. However, I do not think that this is something that can be manipulated in simforest. Beech is set to be nitrogen tolerant (2.0), I think this will have to do for now.
Another problem with changing the equations is that the site quality table is somewhat of a mystery. I have no idea what units any of it is in, or where any of the averages came from. I will look at the simforest website to try and figure this out.
It will probably be easiest to limit the age of beech rather then the size. In the program size (diameter) depends on the site quality and light, which would change the actual growth of all of the trees in the simulation, which is not what we are trying to do. Site quality may be something we want to change for a different affect thought, and I would really like to simulate actual Zoar Valley conditions and not those of New Hampshire, since I'm sure they differ.
~Erin K. Pfeil
AGE = (age(treetable)+1.0)
DIAMETER = (diameter(treetable+growth)
GROWTH = (limiting factors x maximum potential growth)
LIMITING FACOTRS = (light factor x site quality)
Beech bark disease appears to affect trees that have high nitrogen levels more then trees that do not. Beech trees of Zoar Valley would most likely have high nitrogen levels, based on a paper I read that stated that trees in old growth areas (these systems are more productive) have higher nitrogen. However, I do not think that this is something that can be manipulated in simforest. Beech is set to be nitrogen tolerant (2.0), I think this will have to do for now.
Another problem with changing the equations is that the site quality table is somewhat of a mystery. I have no idea what units any of it is in, or where any of the averages came from. I will look at the simforest website to try and figure this out.
It will probably be easiest to limit the age of beech rather then the size. In the program size (diameter) depends on the site quality and light, which would change the actual growth of all of the trees in the simulation, which is not what we are trying to do. Site quality may be something we want to change for a different affect thought, and I would really like to simulate actual Zoar Valley conditions and not those of New Hampshire, since I'm sure they differ.
~Erin K. Pfeil
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