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  Fluxes of carbon and water in a Pinus radiata forest subject to soil water deficit

Arneth, A., Kelliher, F. M., Mcseveny, T. M., & Byers, J. N. (1998). Fluxes of carbon and water in a Pinus radiata forest subject to soil water deficit. Australian Journal of Plant Physiology, 25(5), 557-570.

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BGC0030.pdf (Verlagsversion), 529KB
 
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 Urheber:
Arneth, A.1, Autor           
Kelliher, F. M., Autor
Mcseveny, T. M., Autor
Byers, J. N., Autor
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1External Organizations, ou_persistent22              

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Schlagwörter: Eddy covariance Ecosystem carbon flux Water use efficiency Ecosystem respiration Canopy CO2 flux Eddy-correlation Douglas-fir Surface conductance Nitrogen nutrition Deciduous forest Dioxide exchange Vapor exchange Gas-exchange Open-path Animal & plant sciences Plant sciences
 Zusammenfassung: We measured, by eddy covariance, seasonal CO2 (F-CO2) and water (E) fluxes in an 8-year-old New Zealand Pinus radiata D.Don plantation subject to growing season soil water deficit. Average rates of F-CO2 and E were highest in spring (324 mmol m(-2) d(-1) and 207 mol m(-2) d(-1), respectively) when the abiotic environment was most favourable for surface conductance and photosynthesis. During summer, fluxes were impeded by soil water (theta) deficit and were equal to or smaller than during winter (F-CO2 = 46 mmol m(-2) d(-1) in summer and 115 mmol m(-2) d(-1) in winter; E = 57 and 47 mol m(-2) d(-1), respectively). On particularly hot and dry days, respiration exceeded photosynthetic uptake and the ecosystem was a net carbon source. Portraying the underlying biochemistry of photosynthesis, daytime half-hourly F-CO2 increased with quantum irradiance absorbed by the canopy (Q(abs)) following a non-saturating, rectangular hyperbola. Except for winter, this relation was variable, including hysteresis attributable to diurnal variation in air saturation deficit (D). Daily ecosystem F-CO2, F-CO2/Q(abs) and F-CO2/E were inversely proportional to maximum daily D, but in the cases of F-CO2 and F-CO2/Q(abs) only after soil moisture deficit became established. Consequently, as the tree growing season progressed, ecosystem carbon sequestration was strongly limited by the co-occurrence of high D at low theta. [References: 72]

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 Datum: 1998
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Titel: Australian Journal of Plant Physiology
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Collingwood, Vic., Australia [etc.] : CSIRO Pub. [etc.]
Seiten: - Band / Heft: 25 (5) Artikelnummer: - Start- / Endseite: 557 - 570 Identifikator: CoNE: https://pure.mpg.de/cone/journals/resource/111006469464214
ISSN: 0310-7841