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Soil Organic 14C Dynamics: Effects of Pasture Installation on Arable Land

Published online by Cambridge University Press:  18 July 2016

Jan Hassink
Affiliation:
DLO Research Institute for Agrobiology and Soil Fertility (AB-DLO), P.O. Box 129 NL-9750 AC Haren, The Netherlands
Johannes Van der Plicht
Affiliation:
DLO Research Institute for Agrobiology and Soil Fertility (AB-DLO), P.O. Box 129 NL-9750 AC Haren, The Netherlands
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Abstract

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In a study addressing composition and recovery of soil carbon following pasture installation on arable land, radiocarbon isotope ratios were measured in size- and density-separated soil organic matter (SOM) fractions in a pasture and maize plot. The average soil carbon age increased with depth from 444 yr in the 0–30-cm layer to 2456 yr in the 60–80-cm layer in the pasture soils, and from 42 to 1625 yr in the maize-cultivated soil. Weight fractionation of the macro-organic matter (size >150 μm) in a light (density <1.17 g cm-3) intermediate (1.17 g cm-3 < density < 1.37 g cm-3), and heavy fraction (density >1.37 g cm-3) resulted in markedly different ages for different fractions with ages increasing from 2 yr in the light fraction to >3000 yr in the heavy fractions. 13C and 14C (accelerator mass spectrometry (AMS)) isotope ratios in the <20 μm fraction in the 60–80-cm layer indicated that vertical displacement of colloidal organic material occurred during maize cropping. The physical fractionation method, in combination with natural level 13C and 14C analysis, resulted in a better insight in carbon dynamics that occur after the conversion of arable land to pasture.

Type
Part 2: Applications
Copyright
Copyright © The American Journal of Science 

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