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Soil's carbon storage capacity investigated
Date:7/28/2008

abilization potential was determined, and the relationship between soil C input and soil organic C was analyzed.

Total soil organic C was positively related to C input, and this was primarily due to C stabilization in larger soil aggregates. In both tillage systems, however, C in the two smallest soil size fractions did not increase with greater C input. Moreover, in three soil fractions further separated from larger soil aggregates, C associated with particulate organic matter and microaggregates increased with C input, but there was no increase in C associated with silt-plus-clay, which was the smallest soil size fraction.

Haegeun Chung at University of California, Davis, the first author of the study conducted in Kentucky (USA), stated "Our results indicate that soil fractions with low C stabilization potential show C saturation. Therefore, we need to consider soil C saturation levels to better predict the change in C sink capacity and fertility of soils when soil C input increases under higher plant production or organic amendment."

The full article is available for no charge for 30 days following the date of this summary. View the abstract at http://soil.scijournals.org/cgi/content/abstract/72/4/1132.


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Contact: Sara Uttech
suttech@soils.org
608-268-4948
Soil Science Society of America
Source:Eurekalert

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