Rafael Poyatos
A5087368097- Plant Water Relations and Carbon Dynamics
- Tree-ring climate responses
- Hydrology and Watershed Management Studies
- Forest ecology and management
- Hydrology and Sediment Transport Processes
- Atmospheric and Environmental Gas Dynamics
- Cryospheric studies and observations
- Fire effects on ecosystems
- Soil and Unsaturated Flow
- Climate change and permafrost
- Climate variability and models
- Ecology and Vegetation Dynamics Studies
- Soil erosion and sediment transport
- Historical and socio-economic studies of Spain and related regions
- Species Distribution and Climate Change
- Meteorological Phenomena and Simulations
- Plant responses to elevated CO2
- Hydrology and Drought Analysis
- Mediterranean and Iberian flora and fauna
- Horticultural and Viticultural Research
- Irrigation Practices and Water Management
- Plant Ecology and Soil Science
- Eosinophilic Esophagitis
- Urban Heat Island Mitigation
- Flow Measurement and Analysis
Centre for Research on Ecology and Forestry Applications
2016-2025
Universitat Autònoma de Barcelona
2010-2025
University of Birmingham
2020
Ghent University
2016-2019
Hospital General Universitario de Ciudad Real
2010-2016
Centre for Ecological Research
2012-2015
Geociencias Barcelona
2003-2013
Terra
2013
Durham University
2009-2012
Institute of Space Sciences
2007
Summary Plant function requires effective mechanisms to regulate water transport at a variety of scales. Here, we develop new theoretical framework describing plant responses drying soil, based on the relationship between midday and predawn leaf potentials. The intercept (Λ) characterizes maximum transpiration rate per unit hydraulic capacity, whereas slope (σ) measures relative sensitivity conductance declining availability. This was applied newly compiled global database potentials...
DOI: 10.1111/j.1469-8137.2009.03035.x Commentary p 277
Abstract. Evaporation (E) and transpiration (T) respond differently to ongoing changes in climate, atmospheric composition, land use. It is difficult partition ecosystem-scale evapotranspiration (ET) measurements into E T, which makes it validate satellite data surface models. Here, we review current progress partitioning T provide a prospectus for how improve theory observations going forward. Recent advancements analytical techniques create new opportunities at the ecosystem scale, but...
Abstract The regional variability in tundra and boreal carbon dioxide (CO 2 ) fluxes can be high, complicating efforts to quantify sink‐source patterns across the entire region. Statistical models are increasingly used predict (i.e., upscale) CO large spatial domains, but reliability of different modeling techniques, each with specifications assumptions, has not been assessed detail. Here, we compile eddy covariance chamber measurements annual growing season gross primary productivity (GPP),...
We apply and compare three widely applicable methods for estimating ecosystem transpiration (T) from eddy covariance (EC) data across 251 FLUXNET sites globally. All are based on the coupled water carbon relationship, but they differ in assumptions parameterizations. Intercomparison of daily T estimates shows high correlation among (R between .89 .94), a spread magnitudes T/ET (evapotranspiration) 45% to 77%. When compared at six with concurrent EC sap flow measurements, all EC-based show...
Abstract Heatwaves exert disproportionately strong and sometimes irreversible impacts on forest ecosystems. These remain poorly understood at the tree species level across large spatial scales. Here, we investigate effects of record-breaking 2018 European heatwave growth water status using a collection high-temporal resolution dendrometer data from 21 53 sites. Relative to two preceding years, annual stem was not consistently reduced by but stems experienced twice temporary shrinkage due...
Abstract. Plant transpiration links physiological responses of vegetation to water supply and demand with hydrological, energy, carbon budgets at the land–atmosphere interface. However, despite being main land evaporative flux global scale, its response environmental drivers are currently not well constrained by observations. Here we introduce first compilation whole-plant data from sap flow measurements (SAPFLUXNET, https://sapfluxnet.creaf.cat/, last access: 8 June 2021). We harmonized...
Terrestrial evaporation (E) is a key climatic variable that controlled by plethora of environmental factors. The constraints modulate the from plant leaves (or transpiration, E
Abstract Tundra and boreal ecosystems encompass the northern circumpolar permafrost region are experiencing rapid environmental change with important implications for global carbon (C) budget. We analysed multi-decadal time series containing 302 annual estimates of dioxide (CO 2 ) flux across 70 non-permafrost ecosystems, 672 summer CO 181 ecosystems. find an increase in sink but not despite similar increases uptake. Thus, recent non-growing-season losses have substantially impacted balance...
Land cover mapping obtained from photointerpretation of aerial photographs and orthophotographs was used to quantify land changes between 1957 1996 in a Mediterranean middle mountain area. Expansion forested area is clearly the main change caused by abandonment traditional agricultural activities use other materials energy sources instead forest resources. As result, about 64% covered 1996, whereas forests accounted for only 40% cover. Spontaneous afforestation abandoned fields with Scots...
Summary Drought‐induced defoliation has recently been associated with the depletion of carbon reserves and increased mortality risk in Scots pine ( Pinus sylvestris ). We hypothesize that defoliated individuals are more sensitive to drought, implying potentially higher gas exchange (per unit leaf area) during wet periods may not compensate for their reduced photosynthetic area. measured sap flow, needle water potentials whole‐tree hydraulic conductance analyse drought responses co‐occurring...
Abstract Aim Mediterranean terrestrial ecosystems serve as reference laboratories for the investigation of global change because their transitional climate, high spatiotemporal variability environmental conditions, a rich and unique biodiversity wide range socio‐economic conditions. As scientific development pressures increase, it is increasingly necessary to evaluate recent progress challenge research priorities in face change. Location ecosystems. Methods This article revisits proposed...
Summary Trees play a key role in the global hydrological cycle and measurements performed with thermal dissipation method ( TDM ) have been crucial providing whole‐tree water‐use estimates. Yet, different data processing to calculate water use encapsulates uncertainties that not systematically assessed. We quantified conifer sap flux density F d stand caused by commonly applied methods for deriving zero‐flow conditions, dampening sensor calibration. Their contribution has assessed using stem...
Tree water use is central to plant function and ecosystem fluxes. However, it still unknown how organ-level water-relations traits are coordinated determine whole-tree water-use strategies in response drought, whether this coordination depends on climate. Here we used a global sap flow database (SAPFLUXNET) study the of use, terms canopy conductance (G), vapour pressure deficit (VPD) soil content (SWC) for 142 tree species. We investigated individual effect six (vulnerability embolism, Huber...
Abstract Tree stems exchange CO 2 , CH 4 and N O with the atmosphere but magnitudes, patterns drivers of these greenhouse gas (GHG) fluxes remain poorly understood. Our understanding mainly comes from static-manual measurements, which provide limited information on temporal variability magnitude fluxes. We measured hourly at two stem heights adjacent soils within an upland temperate forest. analyzed diurnal seasonal biophysical (i.e., temperature, soil moisture, sap flux). were a net source...
While the eddy covariance (EC) technique is a well-established method for measuring water fluxes (i.e., evaporation or 'evapotranspiration', ET), measurement susceptible to many uncertainties. One such issue potential underestimation of ET when relative humidity (RH) high (>70%), due low-pass filtering with some EC systems. Yet, this different types systems (e.g. open-path closed-path sensors) has not been characterized synthesis datasets as widely used FLUXNET2015 dataset. Here, we assess...
Abstract Temperature rise and more severe frequent droughts will alter forest transpiration, thereby affecting the global water cycle. Yet, tree responses to increased atmospheric vapour pressure deficit (VPD) reduced soil content (SWC) are not fully understood due long‐term adjustments local environmental conditions that modify transpiration short‐term VPD SWC changes. We analysed sap flux density (SFD) of Fagus sylvatica , Picea abies Pinus sylvestris Quercus ilex from 25 sites across...
Trees remain sufficiently hydrated during drought by closing stomata and reducing canopy conductance (Gc ) in response to variations atmospheric water demand soil availability. Thresholds that control the reduction of Gc are proposed optimize hydraulic safety against carbon assimilation efficiency. However, link between ability stem tissues rehydrate at night remains unclear. We investigated whether species-specific responses aim prevent branch embolisms, or enable night-time rehydration,...