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Re: The Influence of Soil and Water Management on Carbon Erosion and Burial
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by Eric.Sundquist on Wednesday, September 28 @ 11:19:28 MDT
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Hi Martin - thanks for your interest.I don't have Peter Raymond's numbers handy, but my recollection is that the hypothesized alkalinity flux trend is smaller than the flux of organic carbon mobilized by erosion.A couple of observations about the alkalinity trend: - the alkalinity measurements used in the trend analysis are USGS measurements that have been through a number of methodological changes over the years. These changes have been documented, but they complicate the interpretation of observed trends - a likely source of the trend, if real, would be the use of "lime" (carbonate - dolostone and limestone) applied to fields by farmers. I believe that Peter is looking into this possibility -- there are good data concerning the extent of applications to fields. This is a bit different from the hypothesized weathering flux, in that it must be discounted by the GHG "cost" of mining it and getting it into the field, and it is less effective as a cumulative sink than an enhancement of silicate weathering.
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September 25th - 30th
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