Sap flow measurements reveal influence of temperature and stand structure on water use of Eucalyptus regnans forests

Pfautsch, Sebastian; Bleby, Timothy M.; Rennenberg, Heinz; Adams, Mark A.

doi:10.1016/j.foreco.2010.01.006

Cited by 70 publications

(74 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…3), which can explain why most of the individuals studied on the south-facing slope presented a higher Q md values than those on the northfacing slope (Table 3). In this sense, previous works have shown, by means of simple equations or multiplicative models, that sap flow is affected by meteorological variables such as T a , R g , PAR, rainfall and other computed variables like VPD (Badalotti et al 2000;Infante et al 2003;Moro et al 2004;Wang et al 2006;Conejero et al 2007;Poyatos et al 2007;Yue et al 2008;Pfautsch et al 2010), even at night (Fisher et al 2007). In fact, some authors have demonstrated that south-oriented branches present higher sap flow rates than north-oriented branches because of higher exposure to radiation (Steinberg et al 1990).…”

Section: Meteorological Variables and Sap Flowmentioning

confidence: 97%

Daily sap flow rate as an indicator of drought avoidance mechanisms in five Mediterranean perennial species in semi-arid southeastern Spain

Chirino

Bellot

Sánchez

2011

Trees

View full text Add to dashboard Cite

Daily sap flow rate was determined in five Mediterranean species (Pinus halepensis, Quercus coccifera, Pistacia lentiscus, Erica multiflora, and Stipa tenacissima) under two slope aspects (north-and south-facing) in a semi-arid area (Alicante, SE Spain). Sap flow velocity was measured in January, May, August and October of two consecutive years (1998 and 1999) using the stem heat balance (SHB) method. Our results have demonstrated the effects of global radiation (R g ), vapour pressure deficit (VPD) on the sap flow velocity per unit of leaf area. Mean daily sap flow rates (Q md ) showed values between 0.001 and 0.202 g H 2 O cm -2 leaf area day -1 . Q md values were higher on the south-facing slope than on the north-facing slope. In most species, the Q md was higher in 1998 than in 1999 due to the higher soil water content, temperature and VPD in 1998. In all five species, a decrease in predawn leaf water potential was accompanied by a decrease in mean daily sap flow rates; nevertheless, the responses of the five species to water deficit conditions were different. In this context, we have linked the drought avoidance mechanisms of the different species through the combined use of daily sap flow rate and predawn leaf water potential under different water deficit conditions. We conclude that Pinus halepensis, Pistacia lentiscus and Erica multiflora show water-savers mechanisms to cope with drought, while Quercus coccifera and Stipa tenacissima show waterspenders mechanisms.

show abstract

Section: Meteorological Variables and Sap Flowmentioning

confidence: 97%

Daily sap flow rate as an indicator of drought avoidance mechanisms in five Mediterranean perennial species in semi-arid southeastern Spain

Chirino

Bellot

Sánchez

2011

Trees

View full text Add to dashboard Cite

show abstract

“…The installation and sensor design were identical to descriptions provided in Pfautsch et al [31] and Keyimu et al [32].…”

Section: Sap Flow Measurementmentioning

confidence: 99%

Relating Water Use to Tree Vitality of Populus euphratica Oliv. in the Lower Tarim River, NW China

Keyimu

Halik

Rouzi

2017

Water

View full text Add to dashboard Cite

Abstract:This study aimed to compare the hydraulic characteristics of different vitalities of Populus euphratica to reveal the differences in their water use strategies and water consumption to provide useful data to scale water use of riparian poplar forests in the lower reaches of the Tarim River, Northwestern China. Our results showed that the sapwood area of P. euphratica could be estimated based on its correlation with tree biometric parameters. The sapwood area of vital poplars tended to be larger than the senesced poplar despite both having the same diameter at breast height. This indicates that poplar vitality should be taken into account when estimating its sapwood area. Therefore, we established two different sapwood area estimation models for vital and senesced poplar (sapwood area = 1.452 × DBH 1.553 , R 2 = 0.891; sapwood area = 0.915 × DBH 1.618 , R 2 = 0.718; DBH: diameter at breast height). The sap flow process of vital and senesced poplar had certain differences and similarities; the average diurnal sap flow velocity and water consumption of vital poplar were 15.85 cm/h and 45.95 L, respectively; for the senesced poplar, it was 9.64 cm/h and 18.17 L, respectively, which were smaller than that of vital poplars. The influence of environmental factors on the sap flow velocity of two different P. euphratica was similar; the sap flow of both vital and senesced poplar had positive correlation with air temperature (R 2 = 0.800 and 0.851), solar radiation (R 2 = 0.732 and 0.778), vapor pressure deficit (R 2 = 0.508 and 0.643) and groundwater depth (R 2 = 0.301 and 0.171), while negative correlation with air humidity (R 2 = −0.313 and −0.478).

show abstract

“…Although not mentioned by Wood et al, their reported transpiration rates of 1212, 1168 and 1077 mm year -1 for the 24-, 80-and 296-year-old stands are extraordinarily high compared with their reported annual potential evapotranspiration of 861 mm and transpiration rates reported elsewhere for this forest type (Dunn and Connor 1993;Haydon et al 1996;Vertessy et al 2001;Pfautsch et al 2010). In higher rainfall, non-water limited catchments in the same forest type, based on the same sap flow measurement technique as used by Wood et al, Dunn and Connor (1993) and Vertessy et al (2001) reported annual transpiration, including from the understorey, of between 679 and 835 mm year -1 in regrowth stands and between 396 and 547 mm year -1 in oldgrowth stands.…”

Section: Possible Errors In Scaling Heat Pulse Velocitiesmentioning

confidence: 62%

Comment on Wood et al. 2008, 'Impacts of fire on forest age and runoff in mountain ash forests'

Benyon

Haydon

Vertessy

et al. 2010

Functional Plant Biol.

View full text Add to dashboard Cite

Abstract. Wood et al. (2008; FPB 35) concluded their measurements of evapotranspiration (ET) in Eucalyptus regnans F.Muell. forest at Wallaby Creek, Victoria showed that ET differs only slightly between regrowth and oldgrowth, contrary to the findings of previous research. We assert that the conclusions of Wood et al. are invalid and argue that Wood et al. substantially overestimated annual transpiration and rainfall. Monthly whole-forest ET measured by Wood et al. using eddy covariance in a 296-year-old stand sum to~700 mm year -1 ; consistent with rainfall of 721 mm year -1 recorded nearby by the Bureau of Meteorology. However, the Wood et al. conclusions were based on 1077 mm annual transpiration at this site, which appears to be estimated from a few months of heat pulse velocity measurements. Transpiration alone cannot be 54% higher than whole-forest ET because the latter includes transpiration, rainfall interception and evaporation from the forest floor. We believe Wood et al. made errors in scaling heat pulse velocities to whole-stand annual transpiration. Their rainfall of 1175 mm year -1 averages 62% higher than at three Bureau of Meteorology and Melbourne Water sites nearby. The paper also contains inaccuracies in reporting of the literature and numerous other errors.

show abstract

Sap flow measurements reveal influence of temperature and stand structure on water use of Eucalyptus regnans forests

Cited by 70 publications

References 42 publications

Daily sap flow rate as an indicator of drought avoidance mechanisms in five Mediterranean perennial species in semi-arid southeastern Spain

Daily sap flow rate as an indicator of drought avoidance mechanisms in five Mediterranean perennial species in semi-arid southeastern Spain

Relating Water Use to Tree Vitality of Populus euphratica Oliv. in the Lower Tarim River, NW China

Comment on Wood et al. 2008, 'Impacts of fire on forest age and runoff in mountain ash forests'

Contact Info

Product

Resources

About