deadwood and _defrems file

[vpechanec]

Hi,
I apologize for writing the question this way, but nowhere in the documentation, nor in consultation with Mr. Schelhaas, I didn‘t get a sufficient answer.

If I set the value for Fel_dwood in the _defrems file (Removal ratio scenario file) eg 0.5, then I say that 50% of the deadwood will be removed from the forest during harvesting - but this amount is not included in the harvesting volume. (it is so?)

However, in the basic results table x.csv (Detailed volume output file) in the DeadWood column, negative numbers suddenly appear (in the first few timestep). What exactly do mean negative values ​and how does the model take them into account?

If defrem says I can remove 50%, it's based on available deeadwood, right?
But why does a negative number appear? In addition, the value of the number decreases during subsequent timesteps until the deadwood becomes a positive number again.
Does this mean that in each subsequent timestep, the amount of the negative number is deducted from the current stock? that the model will additionally remove what it lacked in the previous timestep?
So is it a cumulative value?

Shouldn't the model work by calculating the current stock of deadwood in each timestep and taking 50% of it, and the result will always be positive or 0?

And a second related question.
According to the manual, natural regeneration is started only after the area has been harvested (or additional bare soil has been added) - depending on the value of the final felling (in the defcut file).

The setting value for items other than fel_stem (eg deadwod) in defrems file - has some effect on the start of natural regeneration? eg. when a negative number appears in the table. Probably not that.

Is it possible to tell the model that it should start regeneration even where there is no final fellings?

Thank you very much for your response
Vilem Pechanec, Palacky University, Czech Republic

[sergoefi]

Hi Vilem.
The removal of deadwood based on deadwood stock and removals ratio.
We never meet negative values, as far as i remember.
Could you provide me the setup of your experiment and i will try to repeat it. You can send it directly to me: by email: sergey.zudin@efi.int
To simulate the natural regeneration we can use only so-named 'bare land' - area cleared from forest ;)
Thanks for the question
Take care
Sergey, senior software developer at EFI