NDLI: Impact of elevated CO2 on soil organic matter dynamics as related to changes in aggregate turnover and residue quality

Content Provider	Springer Nature Link
Author	Six, Johan Carpentier, An van Kessel, Chris Merckx, Roel Harris, David Horwath, William R. Lüscher, Andreas
Copyright Year	2001
Abstract	Increasing global atmospheric CO$_{2}$ concentration can potentially affect C cycling in terrestrial ecosystems. This study was conducted to assess the impact of elevated CO$_{2}$ concentration on soil organic matter and aggregate dynamics in Lolium perenne and Trifolium repens pastures. Soil samples from a 6 year old `free air CO$_{2}$ enrichment' (FACE) experiment were separated in four aggregate size classes (<53, 53–250, 250–2000, and > 2000 μm). Free light fraction (i.e. particulate organic matter (POM) outside of aggregates; free LF) and intra-aggregate-POM (i.e. POM occluded within the aggregate structure; iPOM) were isolated. The distinct $^{13}$C-signature of the CO$_{2}$ used to raise the ambient CO$_{2}$ concentration in FACE allowed us to calculate proportions of recently incorporated C (< 6 yr) in the physically defined soil fractions. The proportion of new C increased with increasing aggregate size class, except the two largest aggregate size classes had a similar proportion of new C; this indicates a faster turnover of macroaggregates compared to microaggregates. In addition, higher proportions of new C in macroaggregates under T. repens compared to L. perenne indicate a faster macroaggregate turnover under T. repens. This faster macroaggregate turnover is hypothesized to be a result of the higher residue quality (C:N ratio) of T. repens compared to L. perenne and reduces the potential of sequestering C under elevated CO$_{2}$. In the L. perenne soil, elevated CO$_{2}$ did not significantly increase total C, but led to: (1) a 54% increase in aggregation and (2) a 40% increase in total iPOM-C. It is hypothesized that the sequestration of iPOM-C induced by elevated CO$_{2}$ in the low residue quality, L. perenne treatment, resulted from an increase in the proportion of large macroaggregates with a slow turnover.
Starting Page	27
Ending Page	36
Page Count	10
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	234
Issue Number	1
e-ISSN	15735036
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2001-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ecology Plant Sciences Plant Physiology Soil Science & Conservation
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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