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The fate of photosynthetically‐fixed carbon in Lolium perenne grassland as modified by elevated CO$ _{2}$ and sward management

Content Provider	Scilit
Author	Hill, P. W. Marshall, C. Williams, G. G. Blum, H. Harmens, H. Jones, D. L. Farrar, J. F.
Copyright Year	2007
Description	Journal: New Phytologist • Prediction of the impact of climate change requires the response of carbon (C) flow in plant–soil systems to increased $CO_{2}$ to be understood. • A mechanism by which grassland C sequestration might be altered was investigated by pulse-labelling Lolium perenne swards, which had been subject to $CO_{2}$ enrichment and two levels of nitrogen (N) fertilization for 10 yr, with$ $^{14}$CO_{2}$. • Over a 6-d period 40–80% of the$ ^{14}$C pulse was exported from mature leaves, 1–2% remained in roots, 2–7% was lost as below-ground respiration, 0.1% was recovered in soil solution, and 0.2–1.5% in soil. Swards under elevated $CO_{2}$ with the lower N supply fixed more$ ^{14}$C than swards grown in ambient $CO_{2}$, exported more fixed$ ^{14}$C below ground and respired less than their high-N counterparts. Sward cutting reduced root$ ^{14}$C, but plants in elevated $CO_{2}$ still retained 80% more$ ^{14}$C below ground than those in ambient $CO_{2}$. • The potential for below-ground C sequestration in grasslands is enhanced under elevated $CO_{2}$, but any increase is likely to be small and dependent upon grassland management.
Related Links	https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1469-8137.2007.01966.x
Ending Page	777
Page Count	12
Starting Page	766
e-ISSN	14698137
DOI	10.1111/j.1469-8137.2007.01966.x
Journal	New Phytologist
Issue Number	4
Volume Number	173
Language	English
Publisher	Wiley-Blackwell
Publisher Date	2007-01-05
Access Restriction	Open
Subject Keyword	Journal: New Phytologist Carbon Partitioning Carbon Sequestration Free Air Carbon Dioxide Enrichment (face)
Content Type	Text
Resource Type	Article

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