Set oxygen limitation to 1 when decomp_scheme is 3 and 4

[mpaiao]

Description

I think this was a copy/paste typo as the code was identical to water limitation. The comment above the code suggested that the idea was to set oxygen limitation to 1 (i.e., no oxygen limitation), so this pull request implements what the comment suggested.

@xiangtaoxu I think you are the one who implemented decomp_scheme = 3 and decomp_scheme = 4, what do you think?

Collaborators

Types of changes

• Hot fix (emergential bug fix to make ED2 run again)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Other (fix or feature that would cause existing functionality to change)

Changes in Settings, Input Files or Output Files

• This feature requires changes in ED2IN
• This feature requires changes in the XML parameter file
• This feature requires changes in other input files
• This feature will change output files

Expectation of Answer Changes:

• No changes expected (bit-for-bit compatibility)
• Changes expected with specific configurations (see details below)
• Changes expected in all simulations (see details below)

This change is needed because otherwise the oxygen limitation factor may be uninitialised.

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• ED2 Wiki update:

Testing :

• All new and existing tests passed.

[xiangtaoxu]

These decomposition schemes were not from me. Based on the annotations above, it might come from Jackie Matthes

!   From Jaclyn Matthes: Empirical equation from meta-analysis in M12.            !
!                                                                                 !
!  Moyano FE, Vasilyeva N, Bouckaert L, Cook F, Craine J, Curiel Yuste J, Don A,  !
!     Epron D, Formanek P, Franzluebbers A et al. 2012. The moisture response of  !
!     soil heterotrophic respiration: interaction with soil properties.           !
!     Biogeosciences, 9: 1173-1182. doi:10.5194/bg-9-1173-2012 (M12).    

I do have read the paper and I agree with you that this is a typo. Oxygen limitation should already be considered in the hump-shaped soil moisture limitation curve