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Healthy eating for soil microbes - Coggle Diagram
Healthy eating for
soil microbes
Carbon storage in soils
Impact of microbial
processing
"More over, the SMB-C pool size and the SMB-C to SOC ratio are sensitive indicators that reflect cropping and management effects. Monitoring the SMB-C pool size and the SMB-C to SOC ratio can thus serve to predict SOC changes.
Wiesmeier et al., 2019
Impact of clay content
tight association of OM molecules and clay particles chemically protects OM from degradation by miccrobes creating a chemically stable SOC pool (
Six et al., 2000; Schmidt et al., 2011
)
Clay mineralogy likely to be important to the amount of C that can be stabiised into the fine fraction of soils - the specific surface area (SSA) of the fine fraction is likely to be determined by the proportion/ presence of 1:1 and 2:1 minerals Feng et al., 2013
"The observation that the decrease in clay- and slit- associated C and N upon cultivation of soils was generally less than the decrease in C and N in the particle size fraction >20um confirms that clay and silt particles protect C against microbial degradation."
Hassink 1997
Current state of soil carbon UK
Scotland
Increase under woodland
No increase but also
NO DECREASE
under
agriculture -
Lilly and Baggley et al., 2019?
England
decreases?
where?
Impact of temperature
and precipitation
Earth Systems Models have always looked at SOC decay as first order kinnetics meaning it is primarily driven in those models by temperature and moisture. this means climate change has a big impact on decay in these models (
Luo et al., 2017
)
temperature sensitivity of POC is on average 28% higher than MAOC - this can be up to 53% higher in cool climates. Georgiou et al., 2024
stoichiometry of
ammendments
C:N
N:P
C:P
Micronutrients
current cropping systems
Microbial biomass size
More half of OM can be made up of microbial necromass and as such future field management techniques need to focus on the promotion of microbial biomass growth.
Liang et al., 2019
larger microbial biomass and higher microbial growth rates resulted in increased mineral associated som as well as proteins and lipids up to 6 months after addition of labeled glucose.
Kallenbach et al., 2015
Show a possible route to increasing SOM and therefore soil carbon storage even under intensive tillage regimes (study was conduced in organic vs conventional soil where difference was addition of organic substrates)
in winter microbial C (and N) increase but this is not associated with an increase in DNA content suggesting that C (and N) become concentrated in the cells (perhaps as osmo or cryo preservants) but that the cells are not activley growing (dividing) so are they getting bigger? This decreases again in spring suggesting a release of those nutrient into the bulk soil - timing for crop?
Schneker et al., 2023