Carbon, water and energy exchange dynamics of a young pine plantation forest during the initial fourteen years of growth

Chan, Felix C.C.; Arain, M. Altaf; Khomik, Myroslava; Brodeur, Jason; Peichl, Matthias; Restrepo‐Coupe, Natalia; Thorne, Robin; Beamesderfer, Eric; McKenzie, Shawn; Xu, Bing; Croft, Holly; Pejam, M. R.; Trant, Janelle; Kula, Michelle; Skubel, Rachel A.

doi:10.1016/j.foreco.2017.12.024

Cited by 22 publications

(11 citation statements)

References 78 publications

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“…These observations are in agreement with studies highlighting radiation as the dominant driver of evaporation of saturated or unstressed ecosystems (e.g. Priestley and Taylor, 1972;Abtew, 1996;Wang et al, 2007;Song et al, 2017;Chan et al, 2018). They also agree with Douglas et al (2009), who found that PT outperformed the PM method for estimating unstressed evaporation in 18 FLUXNET sites.…”

Section: Considerations Regarding Simple Energy-based Methodssupporting

confidence: 91%

Potential evaporation at eddy-covariance sites across the globe

Maes

Gentine

Verhoest

et al. 2019

Hydrol. Earth Syst. Sci.

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Abstract. Potential evaporation (Ep) is a crucial variable for hydrological forecasting and drought monitoring. However, multiple interpretations of Ep exist, which reflect a diverse range of methods to calculate it. A comparison of the performance of these methods against field observations in different global ecosystems is urgently needed. In this study, potential evaporation was defined as the rate of terrestrial evaporation (or evapotranspiration) that the actual ecosystem would attain if it were to evaporate at maximal rate for the given atmospheric conditions. We use eddy-covariance measurements from the FLUXNET2015 database, covering 11 different biomes, to parameterise and inter-compare the most widely used Ep methods and to uncover their relative performance. For each of the 107 sites, we isolate days for which ecosystems can be considered unstressed, based on both an energy balance and a soil water content approach. Evaporation measurements during these days are used as reference to calibrate and validate the different methods to estimate Ep. Our results indicate that a simple radiation-driven method, calibrated per biome, consistently performs best against in situ measurements (mean correlation of 0.93; unbiased RMSE of 0.56 mm day−1; and bias of −0.02 mm day−1). A Priestley and Taylor method, calibrated per biome, performed just slightly worse, yet substantially and consistently better than more complex Penman-based, Penman–Monteith-based or temperature-driven approaches. We show that the poor performance of Penman–Monteith-based approaches largely relates to the fact that the unstressed stomatal conductance cannot be assumed to be constant in time at the ecosystem scale. On the contrary, the biome-specific parameters required by simpler radiation-driven methods are relatively constant in time and per biome type. This makes these methods a robust way to estimate Ep and a suitable tool to investigate the impact of water use and demand, drought severity and biome productivity.

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Section: Considerations Regarding Simple Energy-based Methodssupporting

confidence: 91%

Potential evaporation at eddy-covariance sites across the globe

Maes

Gentine

Verhoest

et al. 2019

Hydrol. Earth Syst. Sci.

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“…In summer, the temperature was high and the ET was concentrated in the study area (Yan et al, 2006). There was a significant seasonal variation in the ratio of every energy flux to RN, indicating that the proportion of energy consumed by vegetation life activities increased during the growing season, while the proportion of energy consumed in the physical environment decreased (Chan et al, 2018).…”

Section: Seasonal and Diurnal Variations Of Energy Fluxesmentioning

confidence: 99%

Analysis on water use efficiency of Populus euphratica forest ecosystem in arid area

Xue

Chen

et al. 2021

Theor Appl Climatol

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Water use efficiency (WUE, the ratio of gross primary productivity (GPP) to evapotranspiration (ET)) reflects the coupled relationship between water loss and carbon gain in the process of plant photosynthetic carbon assimilation. As a dominant tree species in arid area, Populus euphratica plays an important ecological role in slowing desertification. Here, continuous observations of carbon, water and energy fluxes were carried out in Populus euphratica forest with eddy covariance (EC) technique in 2018. We systematically explained the variation characteristics of energy fluxes and WUE at different time scales, and explored the main controlling factors of WUE in drought-stressed environment based on the synchronous meteorological data.Results showed that the carbon exchange of the Populus euphratica forest ecosystem occurred mainly during the growing seasons (April-October). During this period, the entire ecosystem appeared as a carbon sink with the potential to sequester atmospheric carbon dioxide. The average daily WUE was 2.2 g C/kg H2O, which was lower than other temperate forests (2.57-6.07 g C/kg H2O) but higher than grassland, wetland and cropland. We also concluded that an increase in carbon dioxide concentration (CCO2) and air relative humidity (RH) could promote the increase of WUE.Nevertheless, WUE was negatively correlated with air temperature (Ta), photosynthetically active radiation (PAR), and normalized difference vegetation index (NDVI). Additionally, WUE increased under moderate soil water content (SWC), but decreased due to the continuously rising SWC. WUE was more strongly affected by factors affecting water consumption than carbon uptake. Under the conditions of high temperature, strong radiation and low humidity in the summer, the growth rate of ET was much larger than that of GPP. This study not only contributes to our understanding of the carbon, water and energy dynamics of the Populus euphratica forest ecosystem but also provides an important reference for ecological conservation and ecological restoration in arid regions.

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“…En este sentido, el modelo 3-PG (Physiological Principles in Predicting Growth) es un modelo basado en procesos, usado para el manejo forestal, es simple y de libre acceso, se ha aplicado a especies de Pinus (Bryars et al, 2013;Chan et al, 2018), pero particularmente se ha enfocado a eucaliptos; Eucalyptus globulus y E. grandis (Sands, 2004). El crecimiento de E. globulus se ha calibrado en 3-PG como función de variables alométricas, estructura y procesos del dosel, tasas de conversión de energía, conductancia y respuesta estomática, entre otras (Sands y Landsberg, 2002).…”

Section: Introductionunclassified

Uso del modelo 3-PG para la predicción de biomasa de eucalipto en Jalisco, México

Guevara-Escobar

Cervantes-Jiménez

Suzán-Azpiri

2020

MYB

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La modelación de la biomasa en plantaciones forestales es una alternativa para cuantificar el carbono almacenado en la vegetación. Las predicciones son importantes para las decisiones productivas o para los esfuerzos de mitigación de cambio climático. Un aspecto importante es la relación de la humedad de suelo (q) con la biomasa. Se usó el modelo 3-PG para determinar la producción de biomasa en distintos escenarios de q en una plantación de Eucalyptus globulus en un clima subtropical. De 2007 a 2009 se midió q en el perfil 0 m -1.8 m, índice de área foliar y diámetro a la altura del pecho. Se midió la precipitación y se estimaron la evapotranspiración de cultivo y potencial para un año con base en el balance hídrico, con valores de 959 mm, 514.3 mm y 1303 mm respectivamente. La biomasa modelada no fue afectada por q al inicio del año, pero sí por la q mínima del suelo. Los modelos para el índice de área foliar y la evapotranspiración sobreestimaron los datos observados. La biomasa a los ocho años se estimó en 165.5 Mg ha-1, de la cual, 23.1 Mg ha-1 se almacena en raíces y 59.5 Mg ha-1 en biomasa aérea. Concluyendo, los datos de la humedad mínima del suelo son necesarios para modelar el diámetro a la altura del pecho y es preferible el ensamble de modelos en comparación con escoger un solo modelo o usar el promedio de ellos.

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Carbon, water and energy exchange dynamics of a young pine plantation forest during the initial fourteen years of growth

Cited by 22 publications

References 78 publications

Potential evaporation at eddy-covariance sites across the globe

Potential evaporation at eddy-covariance sites across the globe

Analysis on water use efficiency of Populus euphratica forest ecosystem in arid area

Uso del modelo 3-PG para la predicción de biomasa de eucalipto en Jalisco, México

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