Per-input-type fraction of soil carbon input that is stabilised
directly into humus (rather than entering the labile, fresh pool).
The HSOC turnover model takes a scalar humification fraction; this
table supplies the type-specific values so a carbon-input builder can
compute a carbon-weighted effective humification fraction per
cell-year before running the SOC model. Other models (RothC, ICBM,
AMG, Century) use their native carbon partition and ignore this table;
AMG instead uses amg_h_by_input_type. Values are transcribed
from the Spain historical agroecosystem Biomass_coefs
Residue_humified_kgC_kgC column (manure and roots from the
corresponding manure and Root_humified_kgC_kgC entries).
Format
A tibble with columns:
- input_type
Canonical carbon input type:
"crop_residue","root","weed","woody_residue","manure","excreta","urban","urban_compost","compost","green_manure".- humified_fraction
Fraction of input carbon stabilised directly into humus (kg humified carbon per kg carbon input).
- description
Human-readable description of the input type and its Spain historical provenance.
Source
Spain historical agroecosystem coefficient set
(Biomass_coefs.xlsx, Residue_humified_kgC_kgC and
Root_humified_kgC_kgC columns), itself compiled from soil
organic carbon turnover and litter humification studies including
Andren, O. & Katterer, T. (1997).
doi:10.1890/1051-0761(1997)007[1226:ITICBM]2.0.CO;2
; Katterer, T.,
Bolinder, M. A., Andren, O., Kirchmann, H. & Menichetti, L. (2011).
Roots contribute more to refractory soil organic matter than above-
ground crop residues, as revealed by a long-term field experiment.
Agriculture, Ecosystems & Environment, 141(1-2), 184-192.
doi:10.1016/j.agee.2011.02.029
.
Examples
residue_humification
#> # A tibble: 10 × 3
#> input_type humified_fraction description
#> <chr> <dbl> <chr>
#> 1 crop_residue 0.115 Aboveground herbaceous crop residue (cereals…
#> 2 root 0.178 Belowground herbaceous root and rhizodeposit…
#> 3 weed 0.115 Aboveground weed and spontaneous-grass bioma…
#> 4 woody_residue 0.325 Woody residue and prunings from fruit citrus…
#> 5 manure 0.254 Livestock solid and liquid manure averaged o…
#> 6 excreta 0.254 Livestock total excreta averaged over specie…
#> 7 urban 0.320 Urban organic waste applied to soil (aggrega…
#> 8 urban_compost 0.386 Composted municipal solid waste; Spain_Hist …
#> 9 compost 0.71 Stabilised compost amendment; Spain_Hist Bio…
#> 10 green_manure 0.115 Incorporated green manure (fresh herbaceous)…