Measuring water use efficiency of Eucalypt trees with chambers and micrometeorological techniques

Denmead, O. T.; Dunin, F. X.; Wong, Sherman; Greenwood, E. A. N.

doi:10.1016/0022-1694(93)90130-2

Cited by 61 publications

(31 citation statements)

References 11 publications

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“…From their analysis of the aerodynamic parameters, they calculated that hourly rates of CO 2 exchange were similar to those for other natural vegetation, reaching a net uptake rate of CO 2 at midday of 0.1-0.7 mg m À2 s À1 and a net loss of CO 2 at night of 0-3 mg m À2 s À1 , but they did not report rates of water vapour exchange. At a site in Kioloa State Forest, New South Wales, McIlroy and Dunin (1982) and Denmead et al (1993) used the eddy flux technique and measurements of the gradients of water vapour and CO 2 above a 10 m-tall, 11-year-old stand dominated by E. maculata. Rates of transpiration were high (>4 mm per day) in early summer, falling to lower values (about 2 mm per day) in autumn and corresponding daily rates of carbon dioxide uptake were 30 and 20 g m À2 , equivalent to 0.7 and 0.5 mg m À2 s À1 for a 12 h day, similar to those reported by Leuning and Attiwill (1978).…”

Section: Transpirationmentioning

confidence: 99%

“…In Western Australia, the use of large ventilated chambers placed around individual trees was pioneered to estimate transpiration for periods of up to a year or more (Greenwood et al, 1985). While this approach provided useful comparative information about transpiration between species or treatments, errors can occur in transferring the data to trees growing in open conditions because the presence of the chamber changes leaf energy balance (Leuning and Foster, 1990) except when evaporation approaches the equilibrium rate (Dunin and Greenwood, 1986), or when estimating water-use efficiency (Denmead et al, 1993).…”

Section: Transpirationmentioning

confidence: 99%

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Physiological regulation of productivity and water use in Eucalyptus: a review

Whitehead

Beadle

2004

Forest Ecology and Management

303

215

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Section: Transpirationmentioning

confidence: 99%

Section: Transpirationmentioning

confidence: 99%

Physiological regulation of productivity and water use in Eucalyptus: a review

Whitehead

Beadle

2004

Forest Ecology and Management

303

215

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“…Nonetheless, representative fluxes can be inferred from these progressions by fitting nonlinear regressions that describe fluxes at the initial time of chamber closure Anthony et al 1995;Wagner et al 1997;Kutzbach et al 2007;Langensiepen et al 2012;Pihlatie et al 2013). More relevant disturbances include alteration of radiation by the chamber walls, and ventilation affecting both air mixing and aerodynamic and leaf boundary-layer resistances (Denmead 1984;Leuning and Foster 1990;Denmead et al 1993;Le Dantec et al 1999;Hooper et al 2002;Steduto et al 2002;McLeod et al 2004;Christiansen et al 2011). Further major sources of systematic errors include: i) chamber leakage, potentially causing flux underestimation (Held et al 1990;Grau 1995;Steduto et al 2002;Rodeghiero et al 2007;Denmead 2008); ii) inaccurate determination of effective chamber volume (Jassal et al 2012); iii) condensation of water vapour on chamber walls (Pérez-Priego et al 2010); iv) water dilution, particularly when the gas analyser does not compute the dry CO 2 molar fraction, as is the case for some Licor instruments (e.g., Li840/ Li840A, Li820).…”

Section: Introductionmentioning

confidence: 99%

Analysing uncertainties in the calculation of fluxes using whole-plant chambers: random and systematic errors

et al. 2015

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Aims Gas exchange measurements on individual plants depend largely on chamber systems, and uncertainties and corrections in current flux calculation procedures require further assessment. Methods We present a practical study with novel methods for analyses of flux uncertainties in an original chamber design excluding soil fluxes and allowing simultaneous measurements of whole-plant photosynthesis and transpiration. Results Results indicate that random errors caused by IRGA noise and the lack of criteria to optimize the time window (TW) of chamber enclosure lead to significant flux uncertainties (12 %). Although enclosure should be rapid to minimize plant disturbances, longer TWs (3 min) increase confidence in flux estimates. Indeterminate stabilization periods in existing calculation protocols cause significant systematic errors. Stabilization times were identified via the change-point detection method, and flux uncertainties were reduced. Photosynthesis was overestimated by up to 28 % when not correcting the evolving CO2 molar fraction for water vapour dilution. Leakage can compromise flux estimates, but was negligible (ca. 2 %) here due to the large chamber-headspace and relatively small values of both collar contact length and closure time. Conclusions A bootstrapping, resampling-based flux calculation method is presented and recommended to better assess random errors and improve flux precision. We present practical recommendations for the use of whole-plant chambers

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“…Firstly, WUE can be described as a ratio of CO 2 uptake and transpiration in the process of photosynthesis (Polster, 1950;Bierhuizen and Slatyer, 1965;Holmgren, 1965;Tanner and Sinclair, 1983). In this case we are talking about so called water-use effi ciency of photosynthesis (WUE Ph ) or sometimes referred to as WUE I -instantaneous WUE because of the time resolution (Bierhuizen and Slatyer, 1965;Zur and Jones 1984;Baldocchi et al, 1987;Denmead et al, 1993;Lindroth et al, 1994;Cienciala and Lindroth, 1995;Larcher, 2003). For ecological, agricultural and forestry purpose, however, the ratio of dry matter production to water consumption over longer period is more informative than temporary gas exchange ratios.…”

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confidence: 99%

Biomass productivity and water use relation in short rotation poplar coppice (Populus nigra x P. maximowiczii) in the conditions of Czech Moravian Highlands

Fischer¹,

Trnka²,

Kučera³

et al. 2014

Acta Univ. Agric. Silvic. Mendelianae Brun.

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FISCHER, M., TRNKA, M., KUČERA, J., FAJMAN, M., ŽALUD Z.: Biomass productivity and water use relation in short rotation poplar coppice (Populus nigra x P. maximowiczii) in the conditions of Czech MoravianHighlands. Acta univ. agric. et silvic. Mendel. Brun., 2011, LIX, No. 6, pp. 141-152 The plantations of short rotation coppice (SRC) usually based on poplar or willow species are promising source of biomass for energy use. To contribute to decision-making process where to establish the plantations we evaluated the water consumption and its relation to biomass yields of poplar hybrid clone J-105 (Populus nigra x P. maximowiczii) in representative conditions for Czech-Moravian Highlands. Water availability is usually considered as one of the main constraints of profi table SRC culture and therefore we focused on analyzing of the linkage between the aboveground biomass increments and the total stand actual evapotranspiration (ET a ) and on water use effi ciency of production (WUE P ). During the seasons 2008 and 2009 the total stand ET a measured by Bowen ratio energy balance system constructed above poplar canopy and the stem diameter increments of randomly chosen sample trees were examined. The stem diameters were subsequently converted to total aboveground biomass (AB) by allometric equation obtained by destructive analysis at the beginning of 2010. The biomass volume and its increment of particular trees were subsequently converted to the whole canopy growth and correlated with the ET a values. Our results revealed that there was a statistically signifi cant relation between water lost and biomass growth with coeffi cients of determination r 2 0.96 and 0.51 in 2008 and 2009 respectively. By using multiple linear regression analysis additionally accounting for eff ect of precipitation events and thermal time (sums of eff ective temperatures above +5 °C) the AB growth was explained from 98 and 87% in 2008 and 2009, respectively. Therefore for further analysis the multiple linear regression model was applied. The dynamic of seasonal WUE P (expressed as gram of AB dry matter per thousand grams of water) reached up to 6.2 and 6.8 g kg −1 with means 3.13 and 3.54 g kg −1 in both executed years respectively. These values are situated in higher range comparing to the other broadleaved tree species of temperate climate zone and suggest that economically profi table plantation (defi ned by yield at least in the range of 10-12 Mg ha −1 year −1 of dry matter content) will consume more than 450-500 mm per growing season and thus will demand a locality with higher and adequately temporally distributed amount of precipitation especially in rain fed areas such as the discussed Czech-Moravian Highlands.short rotation coppice, biomass increment, water consumption, water use effi ciencyThe term short rotation coppice (SRC) is generally used for any high-yielding woody species managed in a coppice system usually grown especially for energy use on arable land. Typically, these crops are harvested on a 3-7 years long ro...

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Measuring water use efficiency of Eucalypt trees with chambers and micrometeorological techniques

Cited by 61 publications

References 11 publications

Physiological regulation of productivity and water use in Eucalyptus: a review

Physiological regulation of productivity and water use in Eucalyptus: a review

Analysing uncertainties in the calculation of fluxes using whole-plant chambers: random and systematic errors

Biomass productivity and water use relation in short rotation poplar coppice (Populus nigra x P. maximowiczii) in the conditions of Czech Moravian Highlands

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