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| Web URL(s): | https://dl.sciencesocieties.org/publications/aj/articles/97/2/0627
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| Publication Type:
| Refereed |
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| Author(s): | Bremer, Dale J.;
Ham, Jay M. |
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| Author Affiliation: | Bremer: Department of Horticulture, Forestry and Recreation Resources, Kansas State University, Manhattan, Kansas; Ham: Department of Agronomy, Kansas State University, Manhattan, Kansas |
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| Title: | Measurement and partitioning of in situ carbon dioxide fluxes in turfgrasses using a pressurized chamber |
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| Section: | Notes and unique phenomena
Other records with the "Notes and unique phenomena" Section
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| Source: | Agronomy Journal. Vol. 97, No. 2, March/April 2005, p. 627-632. |
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| Publishing Information: | Madison, WI: American Society of Agronomy |
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| # of Pages: | 6 |
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| Related Web URL: | https://dl.sciencesocieties.org/publications/aj/abstracts/97/2/0627
Last checked: 11/02/2016
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Notes: Abstract only |
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| Keywords: | TIC Keywords: Carbon dioxide; Evaluations; Respiration; Photosynthesis; Gas exchange
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| Abstract/Contents: | "Field measurements of photosynthesis in turfgrass often are conducted with hand-held chambers that are temporarily placed over the canopy and soil. Because gas exchange measurements include soil respiration (Rs), results do not represent net canopy photosynthesis (Pc,net) but rather net ecosystem exchange of CO2 (NEE) or gross canopy photosynthesis (Pg) less the sum of canopy respiration (Rc) and Rs. Chambers attached to steady-state, portable photosynthesis systems normally are partially pressurized, which may partially suppress Rs (depending on pressure magnitude and soil moisture and type) and may overestimate NEE. Objectives of this research were to: (i) develop a chamber in which pressure could be manipulated, (ii) measure CO2 fluxes at neutral pressure (chamber pressure equals atmospheric) to estimate NEE; (iii) measure Pc,net by applying increasing pressure until Rs is prevented from entering the chamber, and (iv) partition CO2 fluxes among Pg, Rc, and Rs. Pressure fluctuations of ±-1.0 Pa were uncontrollable, which caused large differences in CO2 exchanges near neutral pressure and prevented measurements of NEE. Chamber pressurization from 50 to 200 Pa suppressed most but not all Rs, which disallowed measurement of Pc,net using a single pressurized reading. A new procedure provided estimates of Pc,net, Rc, and Pg from pressurized measurements of turf under sunlit and shaded conditions and from turf clipped at ground level. Flux from clipped plots under pressurization provided estimates of Rs that could not be suppressed with pressure. This was subtracted from pressurized readings over sunlit and shaded unclipped canopies to estimate Pc,net and Rc, respectively." |
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| Language: | English |
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| References: | 17 |
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| See Also: | See also related article, "Measuring in situ carbon fluxes and partitioning the carbon budget in turfgrass", 2003 Annual Meeting Abstracts, 2003, p. [1] R=92122 R=92122 |
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| Note: | Correction appears in Agronomy Journal, 98(5) September/October 1998, p. 1375: "We wish to report an error that occurred in Equations [5] through [10] of the above paper. Note R is defined as positive throughout the paper (Table 1). We know that a negative number is recorded on the LI-COR 6400 when collecting data, but that is just a matter of definition. Assuming positive values for R, Eq. [5] through [10] should read as follows: Corrections for Eq. [5] and [6]: Sunlit chamber = Pg - (Rc + Rs′) Shaded chamber = Rc + Rs′ Eq. [7] is OK as written in the manuscript: Clipped chamber = Rs′ Eq. [8] and [9] should then read: Pg = sunlit + shaded Pc,net = sunlit + clipped Eq. [10] is OK as written in the manuscript: Rc = shaded - clipped"
Figures
Tables
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Bremer, D. J., and J. M. Ham. 2005. Measurement and partitioning of in situ carbon dioxide fluxes in turfgrasses using a pressurized chamber. Agron. J. 97(2):p. 627-632. |
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https://dl.sciencesocieties.org/publications/aj/articles/97/2/0627
Last checked: 11/02/2016
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https://dl.sciencesocieties.org/publications/aj/pdfs/97/2/0627
Last checked: 11/04/2016
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