Soil carbon and components snapshots

Trials and research are continually uncovering data which helps to demonstrate the complex interactions associated with soil carbon, biology, chemistry and physics. Simple assumptions about cause and effect associated with different farming methodologies can be far from the reality. This section shows snapshots of data which with further reading, soil inspections and trials can help understand the complexity and interactions involved.

soil-organic-carbon-australia

 

soil-carbon-profiles-to-depth-over-40-years-victoria_0

 

 

 

 

 

soil-carbon-profile-to-depth-wa-2013

Total organic carbon to 30 cm in soil across Victoria as affected by region, soil type, and enterprise management. Source Victorian DEPI
2012

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

soil-carbon-conventional-till-v-no-till-usda-2008-franzluebbers-et-al

 

soil-carbon-improves-with-mixed-pastures-source-qld-dpi-futurebeef_0
It is important to know the previous land use history before drawing conclusions about farming impact on soil organic carbon. This data give no indication of farming methods hence carbon flows over time since native vegetation was removed.

 

total-oc-of-sown-vs-native-pastures-source-qld-dpi-futurebeef
The carbon flows above and below the surface in pastures is usually more important than pasture species present when it comes to total soil organic carbon present. Source: Queensland DPI

 

 

Under pasture total organic carbon was being restored to native vegetation level.
Under pasture total organic carbon was being restored to native vegetation level.

 

 

soil-carbon-changes-us-12-year-trial

 

soil-carbon-improves-with-mixed-pastures-source-qld-dpi-futurebeef
Time for changed strategies to have an impact is critical before effect on total soil organic carbon can be demonstrated. Source: Queensland DPI

 

earthworms-versus-p-fertiliser-vdpi-ellinbank-1997-and-2000
Data from Ellinbank Dairy Research farm in Gippsland Victoria suggests making assumptions about phosphorus fertiliser use and negative impacts on microbial biomass and earthworm abundance can be misleading. Source: Victoria DPI Ellinbank.

 

Microbial biomass v P fertiliser VDPI 1997

 

fertiliser-p-and-k-use-australia-balance-2002-to-2009

 

 

 

 

 

 

 

 

 

 

 

 

 

biomass-co2-burst-and-n-mineralisation-source-usda
Impact of microbial biomass carbon on CO2 burst and nitrogen mineralisation. Source: USDA
basic-soil-biological-quality-source-usda-ars
Impact of soil organic matter and microbial population on CO2 respiration and nitrogen mineralisation. Source: USDA

 

lauder-mareeba-fig-3_0

 

lauder-mareeba-fig-2_0

soil-organic-matter-components-source-usda-nrcs
Soil organic matter components. Source: USDA

 

lauder-mareeba-fig-7_0
Carbon flow, water use efficiency and climate resilience under holistic grazing management. Source: Patrick Francis

 

lauder-mareeba-fig-8_0
Carbon flows, water use efficiency and climate resilience under set stocking. Source: Patrick Francis
lauder-mareeba-fig-9_0
Carbon flows, water use efficiency and climate resilience under set stocking and dry growing season and/or drought conditions. Source: Patrick Francis

 

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