Methodology

Soil respiration partitionning

We partition total soil respiration into autotrophic and heterotropic components using a similar partioning experiment to that described in Metcalfe et al (2008). At four points at each corner of the hectare, just outside the plot, we placed nine tubes (n=36 per ha), three of which are short collars (5 cm depth) allowing both heterotrophic and rhizosphere respiration, three of which are longer tubes which have mesh gridding (size xxx) to exclude both roots and mycorrhizae, and three of which have tubes with mesh sizes (size xxx) to exclude only roots but allow mycorrhizae. The three sets have a different litter layer treatment (normal litter, no litter, double litter). We subtract the respiration values from the (normal litter) tubes excluding both roots and mycorrhizae from the respiration values of the (normal litter) short collars which have both heterotrophic and rhizosphere respiration to estimate the percentage autotrophic versus heterotrophic respiration (n=24 per hectare). We then scale our total respiration values by these percentages to estimate total plot autotrophic and heterotrophic respiration (from the 25 collars across the subplots).

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Photos and images

Medium_srcadapterringspec
Uploaded 20 Mar 2013 by Toby Marthews. Copyright © 2017.

Hi Jhon,
I put a schematic of the adapter ring in Appx. II of the RAINFOR-GEM manual (footnote, p.72). If you extract that image and blow it up, you get the attached. With that, you should be able to get an adapter ring made up in any workshop (best to take an SRC-1 with you to the workshop so that they can make it fit exactly).
Saludos,
Toby

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