SAPFLUXNET: towards a global database of sap flow measurements

Poyatos, Rafael; Granda, Víctor; Molowny‐Horas, Roberto; Mencuccini, Maurizio; Steppe, Kathy; Martínez‐Vilalta, Jordi

doi:10.1093/treephys/tpw110

Cited by 118 publications

(103 citation statements)

References 60 publications

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“…At a mixed forest in Europe, the stomatal fraction of the ozone flux from sap measurements is 42% lower than inverting ecosystem‐scale water vapor fluxes (Nunn et al, ). While differences may be due to evaporation from foliage and soil influencing the inversion of ecosystem‐scale water vapor flux, uncertainties in sap flow measurements and scaling techniques (e.g., Poyatos et al, ) may also contribute to differences between approaches.…”

Section: Theory Models and Observations Of Terrestrial Ozone Deposimentioning

confidence: 99%

Dry Deposition of Ozone Over Land: Processes, Measurement, and Modeling

Clifton

Fiore

Massman

et al. 2020

Reviews of Geophysics

113

133

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Dry deposition of ozone is an important sink of ozone in near‐surface air. When dry deposition occurs through plant stomata, ozone can injure the plant, altering water and carbon cycling and reducing crop yields. Quantifying both stomatal and nonstomatal uptake accurately is relevant for understanding ozone's impact on human health as an air pollutant and on climate as a potent short‐lived greenhouse gas and primary control on the removal of several reactive greenhouse gases and air pollutants. Robust ozone dry deposition estimates require knowledge of the relative importance of individual deposition pathways, but spatiotemporal variability in nonstomatal deposition is poorly understood. Here we integrate understanding of ozone deposition processes by synthesizing research from fields such as atmospheric chemistry, ecology, and meteorology. We critically review methods for measurements and modeling, highlighting the empiricism that underpins modeling and thus the interpretation of observations. Our unprecedented synthesis of knowledge on deposition pathways, particularly soil and leaf cuticles, reveals process understanding not yet included in widely used models. If coordinated with short‐term field intensives, laboratory studies, and mechanistic modeling, measurements from a few long‐term sites would bridge the molecular to ecosystem scales necessary to establish the relative importance of individual deposition pathways and the extent to which they vary in space and time. Our recommended approaches seek to close knowledge gaps that currently limit quantifying the impact of ozone dry deposition on air quality, ecosystems, and climate.

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Section: Theory Models and Observations Of Terrestrial Ozone Deposimentioning

confidence: 99%

Dry Deposition of Ozone Over Land: Processes, Measurement, and Modeling

Clifton

Fiore

Massman

et al. 2020

Reviews of Geophysics

113

133

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“…Prior to developing FRAMES, we identified relevant aspects of existing protocols and standards to use as design foundations including ISO standards (ISO 8601, ISO 19115-1:2014), FGDC standards (FGDC, 1998), AmeriFlux/BADM templates (AmeriFlux, 2016), ISCN reporting templates (ISCN, 2016), STRI-CTFS protocols (Anderson-Teixeira et al, 2014;Condit et al, 2014), RAINFOR-GEM protocols RAINFOR, 2016), and Sapfluxnet (Poyatos et al, 2016).…”

Section: Methodsmentioning

confidence: 99%

“…Additionally, we leveraged RAINFOR-GEM's tree assessment protocols for the measurement of tree height and canopy illumination indices RAINFOR, 2016). For sap flow measurements, we consulted the AmeriFlux/BADM and Sapfluxnet protocols (AmeriFlux, 2016;CREAF, 2016;Poyatos et al, 2016). For soil water content and other soil-related observations, we consulted the AmeriFlux/BADM and ISCN data reporting templates (Law et al, 2008;AmeriFlux, 2016;ISCN, 2016).…”

Section: Standardization and Organization Of Metadata According To Bementioning

confidence: 99%

“…AmeriFlux/BADM reporting templates focus primarily on ecosystemlevel observations often aggregated in space and time to describe the area within a flux tower footprint. A variety of frameworks support regional and global data repositories, such as Biofuel Ecophysiological Traits and Yields (BETYdb) Database (LeBauer et al, 2010), Sapfluxnet (Poyatos et al, 2016), and International Soil Carbon Network (ISCN) (ISCN, 2016). These frameworks are designed to capture metadata specific to their respective measurement types.…”

Section: Introductionmentioning

confidence: 99%

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A metadata reporting framework (FRAMES) for synthesis of ecohydrological observations

Christianson

Varadharajan

Christoffersen

et al. 2017

Ecological Informatics

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A B S T R A C TMetadata describe the ancillary information needed for data preservation and independent interpretation, comparison across heterogeneous datasets, and quality assessment and quality control (QA/QC). Environmental observations are vastly diverse in type and structure, can be taken across a wide range of spatiotemporal scales in a variety of measurement settings and approaches, and saved in multiple formats. Thus, well-organized, consistent metadata are required to produce usable data products from diverse environmental observations collected across field sites. However, existing metadata reporting protocols do not support the complex data synthesis and model-data integration needs of interdisciplinary earth system research. We developed a metadata reporting framework (FRAMES) to enable management and synthesis of observational data that are essential in advancing a predictive understanding of earth systems. FRAMES utilizes best practices for data and metadata organization enabling consistent data reporting and compatibility with a variety of standardized data protocols. We used an iterative scientist-centered design process to develop FRAMES, resulting in a data reporting format that incorporates existing field practices to maximize data-entry efficiency. Thus, FRAMES has a modular organization that streamlines metadata reporting and can be expanded to incorporate additional data types. With FRAMES's multi-scale measurement position hierarchy, data can be reported at observed spatial resolutions and then easily aggregated and linked across measurement types to support model-data integration. FRAMES is in early use by both data originators (persons generating data) and consumers (persons using data and metadata). In this paper, we describe FRAMES, identify lessons learned, and discuss areas of future development.

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“…However, the available methods are still far from being simple, inexpensive and reliable enough to become everyday tools for growers. Indeed, such characteristics explain why the relatively simple thermal dissipation technique of Granier () is still the most widely used for research purposes (Poyatos et al ., ), despite its accuracy being challenged by a large number of issues (Vandegehuchte & Steppe, ; Hölttä et al ., ). Thus, there is a call for the development of more reliable low‐cost sap flow systems.…”

Section: Introductionmentioning

confidence: 99%

A single‐probe heat pulse method for estimating sap velocity in trees

2017

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Available sap flow methods are still far from being simple, cheap and reliable enough to be used beyond very specific research purposes. This study presents and tests a new single-probe heat pulse (SPHP) method for monitoring sap velocity in trees using a single-probe sensor, rather than the multi-probe arrangements used up to now. Based on the fundamental conduction-convection principles of heat transport in sapwood, convective velocity (V ) is estimated from the temperature increase in the heater after the application of a heat pulse (ΔT). The method was validated against measurements performed with the compensation heat pulse (CHP) technique in field trees of six different species. To do so, a dedicated three-probe sensor capable of simultaneously applying both methods was produced and used. Experimental measurements in the six species showed an excellent agreement between SPHP and CHP outputs for moderate to high flow rates, confirming the applicability of the method. In relation to other sap flow methods, SPHP presents several significant advantages: it requires low power inputs, it uses technically simpler and potentially cheaper instrumentation, the physical damage to the tree is minimal and artefacts caused by incorrect probe spacing and alignment are removed.

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SAPFLUXNET: towards a global database of sap flow measurements

Cited by 118 publications

References 60 publications

Dry Deposition of Ozone Over Land: Processes, Measurement, and Modeling

Dry Deposition of Ozone Over Land: Processes, Measurement, and Modeling

A metadata reporting framework (FRAMES) for synthesis of ecohydrological observations

A single‐probe heat pulse method for estimating sap velocity in trees

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