Some 50 – 80% of the organic carbon that was once in the topsoil has been lost to the atmosphere...
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Transcript of Some 50 – 80% of the organic carbon that was once in the topsoil has been lost to the atmosphere...
![Page 1: Some 50 – 80% of the organic carbon that was once in the topsoil has been lost to the atmosphere over the last 150 years or so, due to inappropriate management.](https://reader035.fdocuments.in/reader035/viewer/2022062518/56649cb95503460f94980944/html5/thumbnails/1.jpg)
![Page 2: Some 50 – 80% of the organic carbon that was once in the topsoil has been lost to the atmosphere over the last 150 years or so, due to inappropriate management.](https://reader035.fdocuments.in/reader035/viewer/2022062518/56649cb95503460f94980944/html5/thumbnails/2.jpg)
• Some 50 – 80% of the organic carbon that was once in the topsoil has been lost to the atmosphere over the last 150 years or so, due to inappropriate management.
• By inference, degraded soils have the potential to store up to five (5) times more organic carbon in their surface layers than they currently hold.
• But only under changed management.
![Page 3: Some 50 – 80% of the organic carbon that was once in the topsoil has been lost to the atmosphere over the last 150 years or so, due to inappropriate management.](https://reader035.fdocuments.in/reader035/viewer/2022062518/56649cb95503460f94980944/html5/thumbnails/3.jpg)
What Carbon looks like in nature
We can tell, just by looking, that there is more carbon in one area than the next area. The amount of vegetation - both trees and grasses tells us about carbon levels
![Page 4: Some 50 – 80% of the organic carbon that was once in the topsoil has been lost to the atmosphere over the last 150 years or so, due to inappropriate management.](https://reader035.fdocuments.in/reader035/viewer/2022062518/56649cb95503460f94980944/html5/thumbnails/4.jpg)
This cattle ranch in Sonora, Mexico, is typical of hundreds of millions of hectares of grazing land in arid and seasonally dry areas worldwide.
![Page 5: Some 50 – 80% of the organic carbon that was once in the topsoil has been lost to the atmosphere over the last 150 years or so, due to inappropriate management.](https://reader035.fdocuments.in/reader035/viewer/2022062518/56649cb95503460f94980944/html5/thumbnails/5.jpg)
This is the neighboring ranch, La Inmaculada.
![Page 6: Some 50 – 80% of the organic carbon that was once in the topsoil has been lost to the atmosphere over the last 150 years or so, due to inappropriate management.](https://reader035.fdocuments.in/reader035/viewer/2022062518/56649cb95503460f94980944/html5/thumbnails/6.jpg)
This is the neighboring ranch, La Inmaculada.
• Same area • Same rainfall• Same soils• Same plant species• Same season
(pictures taken on the same day)
• La Inmaculada actually has more cattle than the drier ranch
• The only difference is management
![Page 7: Some 50 – 80% of the organic carbon that was once in the topsoil has been lost to the atmosphere over the last 150 years or so, due to inappropriate management.](https://reader035.fdocuments.in/reader035/viewer/2022062518/56649cb95503460f94980944/html5/thumbnails/7.jpg)
![Page 8: Some 50 – 80% of the organic carbon that was once in the topsoil has been lost to the atmosphere over the last 150 years or so, due to inappropriate management.](https://reader035.fdocuments.in/reader035/viewer/2022062518/56649cb95503460f94980944/html5/thumbnails/8.jpg)
![Page 9: Some 50 – 80% of the organic carbon that was once in the topsoil has been lost to the atmosphere over the last 150 years or so, due to inappropriate management.](https://reader035.fdocuments.in/reader035/viewer/2022062518/56649cb95503460f94980944/html5/thumbnails/9.jpg)
• Same area• Same rainfall• Same soils• Same plant species• Same season (pictures
taken on the same day)
• The area above actually has more livestock
• It also has far more wildlife, including buffalo, elephant, and lion
• The only difference is management
![Page 10: Some 50 – 80% of the organic carbon that was once in the topsoil has been lost to the atmosphere over the last 150 years or so, due to inappropriate management.](https://reader035.fdocuments.in/reader035/viewer/2022062518/56649cb95503460f94980944/html5/thumbnails/10.jpg)
When properly managed, grass plants store large amounts of carbon material below the soil surface
Improper management (common in most of the world) leads to poor carbon storage - LH pots
Proper management (RH pot) means plants hold very large amounts of carbon out of sight, below the soil surface
![Page 11: Some 50 – 80% of the organic carbon that was once in the topsoil has been lost to the atmosphere over the last 150 years or so, due to inappropriate management.](https://reader035.fdocuments.in/reader035/viewer/2022062518/56649cb95503460f94980944/html5/thumbnails/11.jpg)
Carbon is black.
When properly managed soils become darker
![Page 12: Some 50 – 80% of the organic carbon that was once in the topsoil has been lost to the atmosphere over the last 150 years or so, due to inappropriate management.](https://reader035.fdocuments.in/reader035/viewer/2022062518/56649cb95503460f94980944/html5/thumbnails/12.jpg)
The simple maths behind Soil Carbon
• One hectare = 10,000 sq. metres• Soil 33.5 cm deep (1 foot approx)• Bulk density = 1.4 tonnes per cubic metre• Soil mass per hectare = about 4,700 tonnes• 1% change in soil organic matter = 47 tonnes• Which gives about 27 tonnes Soil Carbon• This captured 100 tonnes of atmospheric CO2
![Page 13: Some 50 – 80% of the organic carbon that was once in the topsoil has been lost to the atmosphere over the last 150 years or so, due to inappropriate management.](https://reader035.fdocuments.in/reader035/viewer/2022062518/56649cb95503460f94980944/html5/thumbnails/13.jpg)
Soil carbon potential change and CO2 consumption per annum in Australia
Prof. Peter Grace - QUT (personal communication)
![Page 14: Some 50 – 80% of the organic carbon that was once in the topsoil has been lost to the atmosphere over the last 150 years or so, due to inappropriate management.](https://reader035.fdocuments.in/reader035/viewer/2022062518/56649cb95503460f94980944/html5/thumbnails/14.jpg)
Prof. Keith Paustian - University of Colorado (personal communication)
![Page 15: Some 50 – 80% of the organic carbon that was once in the topsoil has been lost to the atmosphere over the last 150 years or so, due to inappropriate management.](https://reader035.fdocuments.in/reader035/viewer/2022062518/56649cb95503460f94980944/html5/thumbnails/15.jpg)
What we see now…
![Page 16: Some 50 – 80% of the organic carbon that was once in the topsoil has been lost to the atmosphere over the last 150 years or so, due to inappropriate management.](https://reader035.fdocuments.in/reader035/viewer/2022062518/56649cb95503460f94980944/html5/thumbnails/16.jpg)
Blinds us to what could be…
![Page 17: Some 50 – 80% of the organic carbon that was once in the topsoil has been lost to the atmosphere over the last 150 years or so, due to inappropriate management.](https://reader035.fdocuments.in/reader035/viewer/2022062518/56649cb95503460f94980944/html5/thumbnails/17.jpg)