Full TGIF Record # 39277
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Author(s):Ross, D. J.; Saggar, S.; Tate, K. R.; Feltham, C. W.; Newton, P. C. D.
Author Affiliation:Ross, Saggar, Tate and Feltham, Landcare Research New Zealand, Private Bag 11052, Palmerston North, New Zealand, and Newton, AgResearch Grasslands, Private Bag 11008, Palmerston North, New Zealand
Title:Elevated CO₂ effects on carbon and nitrogen cycling in grass/clover turves of a psammaquent soil
Source:Plant and Soil. Vol. 182, No. 2, May 1996, p. 185-198.
# of Pages:14
Publishing Information:Dordrecht, Netherlands: Kluwer Academic Publishers
Related Web URL:http://link.springer.com/article/10.1007/BF00029050
    Last checked: 10/14/2015
    Notes: Abstract only
Keywords:TIC Keywords: Carbon; Carbon dioxide; Nitrogen mineralization; Respiration; Soil microorganisms; Soils; Decomposition
Abstract/Contents:"Effects of elevated CO₂ (525 and 700μL L-¹), and a control (350 μL L-¹ CO₂), on biochemical properties of a Mollic Psammaquent soil in a well-established pasture of C3 and C4 grasses and clover were investigated with continuously moist turves in growth chambers over four consecutive seasonal temperature regimes from spring to winter inclusive. After a further 'spring' period, half of the turves under 350 and 700 μL L-¹ were subjected to 'summer' drying and were then re-wetted before a further 'autumn' period; the remaining turves were kept continuously moist throughout these additional three consecutive 'seasons'. The continuously moist turves were then pulse-labelled with ¹⁴C-CO₂ to follow C pathways in the plant/soil system during 35 days. Growth rates of herbage during the first four 'seasons' averaged 4.6 g m-² day-¹ under 700 μL L-¹ CO₂ and were about 10% higher than under the other two treatments. Below-ground net productivity at the end of these 'seasons' averaged 465,800 and 824 g m-² in the control, 525 and 700 μL L-¹ treatments, respectively. In continuously moist soil, elevated CO₂ had no overall effects on total, extractable or microbial C and N. or invertase activity, but resulted in increased CO₂-C production from soil, and from added herbage during the initial stages of decomposition over 21 days; rates of root decomposition were unaffected. CO₂ produced h-¹ mg-¹ microbial C was about 10% higher in the 700 μL L-¹ CO₂ treatment than in the other two treatments. Elevated CO₂ had no clearly defined effects on N availability, or on the net N mineralization of added herbage. In the labelling experiment, relatively more ¹⁴C in the plant/soil system occurred below ground under elevated CO₂, with enhanced turnover of ¹⁴C also being suggested. Drying increased levels of extractable C and organic-N, but decreased mineral-N concentrations; it had no effect on microbial C, but resulted in lowered microbial N in the control only. In soil that had been previously 'summer'-dried, CO₂ production was again higher, but N mineralization was lower, under elevated CO₂ than in the control after 'autumn' pasture growth. Over the trial period of 422 days, elevated CO₂ generally appears to have had a greater effect on soil C turnover than on soil C pools in this pasture ecosystem."
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Ross, D. J., S. Saggar, K. R. Tate, C. W. Feltham, and P. C. D. Newton. 1996. Elevated CO₂ effects on carbon and nitrogen cycling in grass/clover turves of a psammaquent soil. Plant Soil. 182(2):p. 185-198.
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