Three Methods for Monitoring the Gas Exchange of Individual tree Canopies: Ventilated-Chamber, Sap-Flow and Penman-Monteith Measurements on Evergreen Oaks

Goulden, M.; Field, C.

doi:10.2307/2390121

Cited by 87 publications

(62 citation statements)

References 32 publications

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“…Comparisons with the ventilated chamber established that sap-flow sensor output (k) was linearly related to E c , with a lag of up to 1 h due to water storage within the trees (r 2 = 0.8 to 0.95, Goulden and Field 1994). The quantitative relationship between E c and k varied between trees, necessitating a separate calibration for each plant.…”

Section: Sap-flow Measurement and Calculationmentioning

confidence: 99%

“…A ventilated chamber was used to measure canopy gas exchange of each intensively investigated tree over one day in spring 1991 (Goulden and Field 1994). A blower forced air into the chamber, and a second fan in the chamber assured mixing.…”

Section: Canopy Gas Exchangementioning

confidence: 99%

“…Sap flow through five Q. agrifolia and four Q. durata plants, including the intensively investigated plants, was monitored from October 1989 to January 1991 with stem-implanted heat-balance sensors (Granier 1985, Granier 1987, Goulden and Field 1994. Comparisons with the ventilated chamber established that sap-flow sensor output (k) was linearly related to E c , with a lag of up to 1 h due to water storage within the trees (r 2 = 0.8 to 0.95, Goulden and Field 1994).…”

Section: Sap-flow Measurement and Calculationmentioning

confidence: 99%

“…Daily Penman-Monteith evaporation (PME) was calculated as described previously (Goulden and Field 1994). Surface conductance was set at 0.22 mol m 2 s 1 , typical of the wholeplant stomatal conductance (g c ) of both species in spring 1991.…”

Section: Sap-flow Measurement and Calculationmentioning

confidence: 99%

“…Sap-flow-based E was calculated as the product of k and the ratio of k to E c observed for each plant in the ventilated chamber (Goulden and Field 1994). Canopy conductance was calculated from E s , ambient temperature (T a ), ambient humidity (h a ), net radiation (R n ), and aerodynamic conductance (g a ) by inverting the Penman-Monteith equation (Campbell 1977).…”

Section: Sap-flow Measurement and Calculationmentioning

confidence: 99%

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Carbon assimilation and water-use efficiency by neighboring Mediterranean-climate oaks that differ in water access

Goulden¹

1996

Tree Physiology

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Carbon assimilation and water-use efficiency by neighboring Mediterranean-climate oaks that differ in water access. To assess how carbon uptake and water-use efficiency (WUE) are affected by water access, I monitored leaf and canopy gas exchange of neighboring Q. durata and Q. agrifolia trees over a 15-month period. Transpiration and photosynthesis by Q. agrifolia peaked in spring and declined through the summer, whereas transpiration and photosynthesis by Q. durata continued at a moderate rate year round. When summed over the study, Q. agrifolia transpired 25% less water on a ground-area basis than Q. durata, but assimilated 25% more carbon. Quercus agrifolia achieved a greater integrated WUE by: (1) maintaining a 20% advantage in instantaneous WUE as a result of lower leaf intercellular CO 2 concentrations; (2) responding rapidly to increased soil water following rain; and (3) assimilating carbon at high rates during periods of low evaporative demand.

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Section: Sap-flow Measurement and Calculationmentioning

confidence: 99%

Section: Canopy Gas Exchangementioning

confidence: 99%

Section: Sap-flow Measurement and Calculationmentioning

confidence: 99%

Section: Sap-flow Measurement and Calculationmentioning

confidence: 99%

Section: Sap-flow Measurement and Calculationmentioning

confidence: 99%

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Carbon assimilation and water-use efficiency by neighboring Mediterranean-climate oaks that differ in water access

Goulden¹

1996

Tree Physiology

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Evaporation Measurement

Verhoef

Campbell

2005

Encyclopedia of Hydrological Sciences

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This chapter summarises the practical methods available to estimate evaporation, E . It describes the background of methods based on soil physical, micrometeorological and plant physiological concepts. The most appropriate method will mainly depend on required spatial and temporal scales of E , accuracy needed, and the available resources (financial and manpower). These issues are taken into account during the discussion.

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Tree Mortality Decreases Water Availability and Ecosystem Resilience to Drought in Piñon‐Juniper Woodlands in the Southwestern U.S.

et al. 2017

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Climate‐driven tree mortality has increased globally in response to warmer temperature and more severe drought. To examine how tree mortality in semiarid biomes impacts surface water balance, we experimentally manipulated a piñon‐juniper (PJ) woodland by girdling all adult piñon trees in a 4 ha area, decreasing piñon basal area by ~65%. Over 3.5 years (2009–2013), we compared water flux measurements from this girdled site with those from a nearby intact PJ woodland. Before and after girdling, the ratio of evapotranspiration (ET) to incoming precipitation was similar between the two sites. Girdling altered the partitioning of ET such that the contribution of canopy transpiration to ET decreased 9–14% over the study period, relative to the intact control, while noncanopy ET increased. We attributed the elevated noncanopy ET in the girdled site each year to winter increases in sublimation and summer increases in both soil evaporation and below‐canopy transpiration. Although we expected that mortality of a canopy dominant would increase the availability of water and other resources to surviving vegetation, we observed a decrease in both soil volumetric water content and sap flow rates in the remaining trees at the girdled site, relative to the control. This postgirdling decrease in the performance of the remaining trees occurred during the severe 2011–2012 drought, suggesting that piñon mortality may trigger feedback mechanisms that leave PJ woodlands drier relative to undisturbed sites and potentially more vulnerable to drought.

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Three Methods for Monitoring the Gas Exchange of Individual tree Canopies: Ventilated-Chamber, Sap-Flow and Penman-Monteith Measurements on Evergreen Oaks

Cited by 87 publications

References 32 publications

Carbon assimilation and water-use efficiency by neighboring Mediterranean-climate oaks that differ in water access

Carbon assimilation and water-use efficiency by neighboring Mediterranean-climate oaks that differ in water access

Evaporation Measurement

Tree Mortality Decreases Water Availability and Ecosystem Resilience to Drought in Piñon‐Juniper Woodlands in the Southwestern U.S.

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