Evapotranspiration of subtropical forests and tree plantations: A comparative analysis at different temporal and spatial scales

Cristiano, Piedad M.; Campanello, Paula I.; Bucci, Sandra Janet; Rodríguez, Sabrina Andrea; Lezcano, Oscar A.; Scholz, Fabián Gustavo; Madanes, Nora; Francescantonio, Débora di; Carrasco, Laureano Oliva; Zhang, Yong‐Jiang; Goldstein, Guillermo

doi:10.1016/j.agrformet.2015.01.007

Cited by 50 publications

(24 citation statements)

References 45 publications

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“…Studies performed in the Amazon have found similar recycling rates, 67-74% in Caxiuana [12] and 37% in Manaus [10]. In a subtropical Atlantic forest in the Brazil -Argentina border, the recycling rate reached 64% [37]. Moreover, our estimates are in concordance with a standard global maximum evapotranspiration (ET) for the tropical forest (approx.…”

Section: Discussion (A) Site-level Water Usesupporting

confidence: 87%

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ENSO effects on the transpiration of eastern Amazon trees

Brum

Lopez

Asbjornsen

et al. 2018

Phil. Trans. R. Soc. B

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Tree transpiration is important in the recycling of precipitation in the Amazon and might be negatively affected by El Niño–Southern Oscillation (ENSO)–induced droughts. To investigate the relative importance of soil moisture deficits versus increasing atmospheric demand (VPD) and determine if these drivers exert different controls over tree transpiration during the wet season versus the dry season (DS), we conducted sap flow measurements in a primary lowland tropical forest in eastern Amazon during the most extreme ENSO-induced drought (2015/2016) recorded in the Amazon. We also assessed whether trees occupying different canopy strata contribute equally to the overall stand transpiration ( T stand ). Canopy trees were the primary source of T stand . However, subcanopy trees are still important as they transpired an amount similar to other biomes around the globe. Tree water use was higher during the DS, indicating that during extreme drought trees did not reduce transpiration in response to low soil moisture. Photosynthetically active radiation and VPD exerted an overriding effect on water use patterns relative to soil moisture during extreme drought, indicating that light and atmospheric constraints play a critical role in controlling ecosystem fluxes of water. Our study highlights the importance of canopy and subcanopy trees to the regional water balance and highlights the resilience to droughts that these trees show during an extreme ENSO event. This article is part of a discussion meeting issue ‘The impact of the 2015/2016 El Niño on the terrestrial tropical carbon cycle: patterns, mechanisms and implications’.

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Section: Discussion (A) Site-level Water Usesupporting

confidence: 87%

“…Similarly to other tropical research, canopy trees transpired much more water relative to subcanopy trees [10,37,[39][40][41][42]. At the tree level, water consumption was positively related to trees size (electronic supplementary material, figures S2-S4).…”

Section: (B) Contribution Of Different Tree Strata To Stand-level Trasupporting

confidence: 51%

ENSO effects on the transpiration of eastern Amazon trees

Brum

Lopez

Asbjornsen

et al. 2018

Phil. Trans. R. Soc. B

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“…en Brasil por Stape et al (2004) y Laclau et al (2010), que incide en su elevada eficiencia en el uso del agua. El valor de evapotranspiración de esta plantación, 1.307 mm, está dentro del rango observado en plantaciones similares de E. grandis en Brasil y en la provincia de Misiones de Argentina, con valores entre 920 y 1.389 mm (Cristiano et al 2015). Estos autores determinaron que los valores de evapotranspiración de plantaciones de E. grandis fueron similares a los del bosque nativo del NO de Misiones.…”

Section: Discussionunclassified

Modelo empírico integral de una plantación de Eucalyptus granáis en Concordia, Entre Ríos

et al. 2016

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Provincial 22 y vías del Ferrocarril, Concordia, Entre Ríos. SUMMARYThe Argentinian Mesopotamia is the core of fast-growing tree species plantations of the country. Eucalyptus grandis plantations constitute 90 % of the forested area with Eucalyptus spp. in NE Entre Rios. Based on previous studies on structural and functional features, a comprehensive model is here proposed on emergence of new properties linked to matter and ecosystem processes. Data from different plantations at harvest time were used: biomass, net primary productivity, water flows, nutrient flows, nutrient content in biomass, necromass and soil. Aboveground biomass, productivity and nutrient requirements were higher than belowground ones. Nutrient requirements, except phosphorus, were provided mostly by the absorption rather than by retranslocation whilst the opposite situation was observed in phosphorus. Litter fall and roots mortality were the main ways of nutrient return, except for potassium, which returned mainly by water flows. The high productivity of the plantation was supported by an important water and nutrients use efficiency. The importance of an appropriate harvest residue management is highlighted, since export of total aboveground biomass and its nutrients content involves a high distribution, compared with belowground storages. Compared with nitrogen, high phosphorus retranslocation efficiency would allow plantation to be more independent of mineralization and immobilization edaphic processes.Key words: biomass, necromass, productivity, water flows, nutrient cycles. RESUMENLa Mesopotamia argentina es la zona núcleo de especies forestales de rápido crecimiento del país. Las plantaciones de Eucalyptus grandis constituyen el 90 % de la superficie forestada con eucaliptos del noreste de Entre Ríos. A partir de estudios previos sobre sus aspectos estructurales y funcionales se propone elaborar un modelo integral del que emerjan nuevas propiedades vinculadas con los almacenajes de la materia y procesos ecosistémicos. Se utilizaron datos de plantaciones al turno, de: biomasa, productividad primaria neta, flujos hídricos, flujos de nutrientes, contenido de nutrientes en la biomasa, necromasa y en el suelo. Se destaca la contribución de la parte aérea de la plantación en la distribución de la biomasa, asignación de la productividad y requerimiento de nutrientes. Los requerimientos de nutrientes, excepto fósforo, fueron provistos mayormente por absorción que por distribución, contrario a lo que ocurrió con el fósforo. La caída al mantillo y mortalidad de raíces fueron las vías principales de retorno de nutrientes, excepto el potasio, el cual retornó principalmente por los flujos hídricos. La elevada productividad de la plantación fue sostenida por una alta eficiencia en el uso del agua y nutrientes. Se destaca la importancia del adecuado manejo de los residuos de la cosecha, ya que la exportación de la biomasa aérea completa y los nutrientes que contiene implican una extracción elevada, comparada con los almacenajes subterráneos. Comparad...

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“…We varied the total diurnal volume of water taken up by the tree. New SF t values are scaled using algorithms from literature that provide an estimate of the daily sap flow volume of a tree based on its DBH (Andrade et al , 2005; Cristiano et al , 2015).…”

Section: Methodsmentioning

confidence: 99%

Diurnal variation in xylem water isotopic signature biases depth of root-water uptake estimates

Deurwaerder

Visser

Detto

et al. 2019

Preprint

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Total word count (ex. summary, references and legends): 6 932 words 25 of which: Summary (198 words); Introduction (698 words); Material and Methods (2 922 words); Results (1 138 words); Discussion (1 556 words) Conclusion (222 words); Acknowledgement (128 words) Number of color figures: 7 figures 30 Number of Tables: 2 tables Supplementary information: 7 (color Fig S1-S5 + Table S1-S2) 2 Summary  Stable water isotopes are a powerful and widely used tool to derive the depth of root water uptake (RWU) in lignified plants. Uniform xylem water isotopic signature (i-35 H2O-xyl) along the length of a lignified plant is a central assumption, which has never been properly evaluated. Here we studied the effects of diurnal variation in RWU, sap flow velocity and various other soil and plant parameters on i-H2O-xyl signature within a plant using a mechanistic plant hydraulic model. 40  Our model predicts significant variation in i-H2O-xyl along the full length of an individual plant arising from diurnal RWU fluctuations and vertical soil water heterogeneity. Moreover, significant differences in i-H2O-xyl emerge between individuals with different sap flow velocities. We corroborated our model predictions with field observations from French Guiana and northwestern China. Modelled i-H2O-45 xyl varied considerably along stem length ranging up to 18.3‰ in δ 2 H and 2.2‰ in δ 18 O, largely exceeding the range of measurement error.  Our results show clear violation of the fundamental assumption of uniform i-H2O-xyland occurrence of significant biases when using stable isotopes to assess RWU. As a solution, we propose to include monitoring of sap flow and soil water potential for 50 more robust RWU depth estimates.

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Evapotranspiration of subtropical forests and tree plantations: A comparative analysis at different temporal and spatial scales

Cited by 50 publications

References 45 publications

ENSO effects on the transpiration of eastern Amazon trees

ENSO effects on the transpiration of eastern Amazon trees

Modelo empírico integral de una plantación de Eucalyptus granáis en Concordia, Entre Ríos

Diurnal variation in xylem water isotopic signature biases depth of root-water uptake estimates

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