We are no longer updating the Research Digest. All content remains.
The Permaculture Research Digest has summaries of newly published permaculture-related research. All items are hyper-linked to the original publication.
The 'January 2013' archive contains 60 items published in 2012.
Items marked with a # have restricted public access, although abstracts are freely available.
Current estimates
of soil organic carbon (SOC) are based on surficial measurements
to depths of 0.3 to 1 m. But many of the world’s soils greatly exceed 1 m
depth. This paper provides the
first detailed analysis of these previously unreported stores of SOC.Soils from five
sites in south-western Australia were analysed for SOC. These soils ranged between 5 and
38 m depth to bedrock. Mean SOC for each of the five locations varied from 21.8–37.5 kg C m−2, two to five times greater than from sampling to a depth of just 0.5 m.
This finding may
have major implications for estimates of global carbon storage and
modelling of the impacts of climate change. The paper demonstrates the need for a
reassessment of the current shallow soil sampling depths for
assessing carbon stocks and a revision of global SOC estimates.
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