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Effects of elevated atmospheric CO2 concentrations, clipping regimen and differential day/night atmospheric warming on tissue nitrogen concentrations of a perennial pasture grass.

Volder A, Gifford RM, Evans JR - AoB Plants (2015)

Bottom Line: Both warming treatments increased leaf N concentrations under ambient CO2 concentrations, but did not significantly alter leaf N concentrations under elevated CO2 concentrations.Nitrogen resorption from leaves was decreased under elevated CO2 conditions as well as by more frequent clipping.Overall, the effects of CO2, warming and clipping treatments on aboveground tissue N concentrations were much greater than on belowground tissue.

View Article: PubMed Central - PubMed

Affiliation: Department of Plant Sciences, University of California - Davis, Davis, CA, USA avolder@ucdavis.edu.

No MeSH data available.


Effect of clipping frequency (open bar = infrequent, hashed bar = frequent) on C : N ratios of (A) green leaf material and (B) litter, through time averaged across CO2 and warming treatments. Dashed line indicates overall mean across dates, CO2 and warming treatment for each clipping frequency, infrequent (grey) and frequent (black). Different letters indicate statistically significant differences between C : N ratios at P < 0.05 using Student's t LSD test.
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PLV094F3: Effect of clipping frequency (open bar = infrequent, hashed bar = frequent) on C : N ratios of (A) green leaf material and (B) litter, through time averaged across CO2 and warming treatments. Dashed line indicates overall mean across dates, CO2 and warming treatment for each clipping frequency, infrequent (grey) and frequent (black). Different letters indicate statistically significant differences between C : N ratios at P < 0.05 using Student's t LSD test.

Mentions: Elevated CO2 increased leaf C : N ratios, particularly under the high night-time warming scenario (‘HN’, , from 18.0 to 22.9, Fig. 2B). Changes in leaf C : N ratio in response to elevated CO2 reflect changes in leaf N concentration. There was no relationship between changes in C : N ratio and changes in C concentration in response to elevated CO2. Increased clipping frequency decreased green leaf C : N ratios by an average of 24 %, from 23.6 to 17.9 (Fig. 3A, P < 0.001).Figure 3.


Effects of elevated atmospheric CO2 concentrations, clipping regimen and differential day/night atmospheric warming on tissue nitrogen concentrations of a perennial pasture grass.

Volder A, Gifford RM, Evans JR - AoB Plants (2015)

Effect of clipping frequency (open bar = infrequent, hashed bar = frequent) on C : N ratios of (A) green leaf material and (B) litter, through time averaged across CO2 and warming treatments. Dashed line indicates overall mean across dates, CO2 and warming treatment for each clipping frequency, infrequent (grey) and frequent (black). Different letters indicate statistically significant differences between C : N ratios at P < 0.05 using Student's t LSD test.
© Copyright Policy - creative-commons
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4591745&req=5

PLV094F3: Effect of clipping frequency (open bar = infrequent, hashed bar = frequent) on C : N ratios of (A) green leaf material and (B) litter, through time averaged across CO2 and warming treatments. Dashed line indicates overall mean across dates, CO2 and warming treatment for each clipping frequency, infrequent (grey) and frequent (black). Different letters indicate statistically significant differences between C : N ratios at P < 0.05 using Student's t LSD test.
Mentions: Elevated CO2 increased leaf C : N ratios, particularly under the high night-time warming scenario (‘HN’, , from 18.0 to 22.9, Fig. 2B). Changes in leaf C : N ratio in response to elevated CO2 reflect changes in leaf N concentration. There was no relationship between changes in C : N ratio and changes in C concentration in response to elevated CO2. Increased clipping frequency decreased green leaf C : N ratios by an average of 24 %, from 23.6 to 17.9 (Fig. 3A, P < 0.001).Figure 3.

Bottom Line: Both warming treatments increased leaf N concentrations under ambient CO2 concentrations, but did not significantly alter leaf N concentrations under elevated CO2 concentrations.Nitrogen resorption from leaves was decreased under elevated CO2 conditions as well as by more frequent clipping.Overall, the effects of CO2, warming and clipping treatments on aboveground tissue N concentrations were much greater than on belowground tissue.

View Article: PubMed Central - PubMed

Affiliation: Department of Plant Sciences, University of California - Davis, Davis, CA, USA avolder@ucdavis.edu.

No MeSH data available.