Acclimation response of spring wheat in a free-air CO2 enrichment (FACE) atmosphere with variable soil nitrogen regimes. 3. Canopy architecture and gas exchange

Talbot J. Brooks, Gerard W. Wall, Paul J. Pinter, Bruce A. Kimball, Robert L. Lamorte, Steven Leavitt, Allan D. Matthias, Floyd J. Adamsen, Douglas J. Hunsaker, Andrew N. Webber

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

The response of whole-canopy net CO2 exchange rate (CER) and canopy architecture to CO2 enrichment and N stress during 1996 and 1997 for open-field-grown wheat ecosystem (Triticum aestivum L. cv. Yecora Rojo) are described. Every Control (C) and FACE (F) CO2 treatment (defined as ambient and ambient +200 μmol mol-1, respectively) contained a Low- and High-N treatment. Low-N treatments constituted initial soil content amended with supplemental nitrogen applied at a rate of 70 kg N ha-1 (1996) and 15 kg N ha-1 (1997), whereas High-N treatments were supplemented with 350 kg N ha-1 (1996 and 1997). Elevated CO2 enhanced season-long carbon accumulation by 8% and 16% under Low-N and High-N, respectively. N-stress reduced season-long carbon accumulation 14% under ambient CO2, but by as much as 22% under CO2 enrichment. Averaging both years, green plant area index (GPAI) peaked approximately 76 days after planting at 7.13 for FH, 6.00 for CH, 3.89 for FL, and 3.89 for CL treatments. Leaf tip angle distribution (LTA) indicated that Low-N canopies were more erectophile than those of High-N canopies: 48° for FH, 52° for CH, and 58° for both FL and CL treatments. Temporal trends in canopy greenness indicated a decrease in leaf Chlorophyll content from the flag to flag-2 leaves of 25% for FH, 28% for CH, 17% for CL, and 33% for FL during 1997. These results indicate that significant modifications of canopy architecture occurs in response to both CO2 and N-stress. Optimization of canopy architecture may serve as a mechanism to diminish CO2 and N-stress effects on CER.

Original languageEnglish (US)
Pages (from-to)97-108
Number of pages12
JournalPhotosynthesis Research
Volume66
Issue number1-2
DOIs
StatePublished - 2000

Fingerprint

Earth atmosphere
Acclimatization
spring wheat
Atmosphere
Triticum
gas exchange
acclimation
Nitrogen
Soil
Carbon
Gases
carbon dioxide
Air
canopy
Viridiplantae
Soils
air
nitrogen
Chlorophyll
Ecosystem

Keywords

  • Canopy architecture
  • Canopy photosynthesis
  • CO enrichment
  • Global change
  • Leaf area index
  • Leaf tip angle
  • Nitrogen stress
  • Triticum aestivum

ASJC Scopus subject areas

  • Plant Science

Cite this

Acclimation response of spring wheat in a free-air CO2 enrichment (FACE) atmosphere with variable soil nitrogen regimes. 3. Canopy architecture and gas exchange. / Brooks, Talbot J.; Wall, Gerard W.; Pinter, Paul J.; Kimball, Bruce A.; Lamorte, Robert L.; Leavitt, Steven; Matthias, Allan D.; Adamsen, Floyd J.; Hunsaker, Douglas J.; Webber, Andrew N.

In: Photosynthesis Research, Vol. 66, No. 1-2, 2000, p. 97-108.

Research output: Contribution to journalArticle

Brooks, Talbot J. ; Wall, Gerard W. ; Pinter, Paul J. ; Kimball, Bruce A. ; Lamorte, Robert L. ; Leavitt, Steven ; Matthias, Allan D. ; Adamsen, Floyd J. ; Hunsaker, Douglas J. ; Webber, Andrew N. / Acclimation response of spring wheat in a free-air CO2 enrichment (FACE) atmosphere with variable soil nitrogen regimes. 3. Canopy architecture and gas exchange. In: Photosynthesis Research. 2000 ; Vol. 66, No. 1-2. pp. 97-108.
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abstract = "The response of whole-canopy net CO2 exchange rate (CER) and canopy architecture to CO2 enrichment and N stress during 1996 and 1997 for open-field-grown wheat ecosystem (Triticum aestivum L. cv. Yecora Rojo) are described. Every Control (C) and FACE (F) CO2 treatment (defined as ambient and ambient +200 μmol mol-1, respectively) contained a Low- and High-N treatment. Low-N treatments constituted initial soil content amended with supplemental nitrogen applied at a rate of 70 kg N ha-1 (1996) and 15 kg N ha-1 (1997), whereas High-N treatments were supplemented with 350 kg N ha-1 (1996 and 1997). Elevated CO2 enhanced season-long carbon accumulation by 8{\%} and 16{\%} under Low-N and High-N, respectively. N-stress reduced season-long carbon accumulation 14{\%} under ambient CO2, but by as much as 22{\%} under CO2 enrichment. Averaging both years, green plant area index (GPAI) peaked approximately 76 days after planting at 7.13 for FH, 6.00 for CH, 3.89 for FL, and 3.89 for CL treatments. Leaf tip angle distribution (LTA) indicated that Low-N canopies were more erectophile than those of High-N canopies: 48° for FH, 52° for CH, and 58° for both FL and CL treatments. Temporal trends in canopy greenness indicated a decrease in leaf Chlorophyll content from the flag to flag-2 leaves of 25{\%} for FH, 28{\%} for CH, 17{\%} for CL, and 33{\%} for FL during 1997. These results indicate that significant modifications of canopy architecture occurs in response to both CO2 and N-stress. Optimization of canopy architecture may serve as a mechanism to diminish CO2 and N-stress effects on CER.",
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AU - Kimball, Bruce A.

AU - Lamorte, Robert L.

AU - Leavitt, Steven

AU - Matthias, Allan D.

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AB - The response of whole-canopy net CO2 exchange rate (CER) and canopy architecture to CO2 enrichment and N stress during 1996 and 1997 for open-field-grown wheat ecosystem (Triticum aestivum L. cv. Yecora Rojo) are described. Every Control (C) and FACE (F) CO2 treatment (defined as ambient and ambient +200 μmol mol-1, respectively) contained a Low- and High-N treatment. Low-N treatments constituted initial soil content amended with supplemental nitrogen applied at a rate of 70 kg N ha-1 (1996) and 15 kg N ha-1 (1997), whereas High-N treatments were supplemented with 350 kg N ha-1 (1996 and 1997). Elevated CO2 enhanced season-long carbon accumulation by 8% and 16% under Low-N and High-N, respectively. N-stress reduced season-long carbon accumulation 14% under ambient CO2, but by as much as 22% under CO2 enrichment. Averaging both years, green plant area index (GPAI) peaked approximately 76 days after planting at 7.13 for FH, 6.00 for CH, 3.89 for FL, and 3.89 for CL treatments. Leaf tip angle distribution (LTA) indicated that Low-N canopies were more erectophile than those of High-N canopies: 48° for FH, 52° for CH, and 58° for both FL and CL treatments. Temporal trends in canopy greenness indicated a decrease in leaf Chlorophyll content from the flag to flag-2 leaves of 25% for FH, 28% for CH, 17% for CL, and 33% for FL during 1997. These results indicate that significant modifications of canopy architecture occurs in response to both CO2 and N-stress. Optimization of canopy architecture may serve as a mechanism to diminish CO2 and N-stress effects on CER.

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