Root Function: In Situ Studies Through Sap Flow Research

Nadezhdina, Nadezhda; David, Teresa S.; David, Jorge S.; Nadezhdin, Valeriy; Čermák, Jan; Gebauer, Roman; Ferreira, Maria Isabel; Conceição, Nuno; Dohnal, Michal; Tesař, Miroslav; Gartner, Karl; Ceulemans, R.

doi:10.1007/978-3-642-22067-8_14

Cited by 8 publications

(5 citation statements)

References 26 publications

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“…Yet this was performed under controlled conditions, while there is no standard method to monitor three-dimensional water uptake distribution of growing roots in situ. In woody plants, in which roots are thick enough, Nadezhdina et al (2010Nadezhdina et al ( , 2012Nadezhdina et al ( , 2015 used sap flow measurements in roots to quantify hydraulic redistribution.…”

Section: Introductionmentioning

confidence: 99%

Reviews and syntheses: Isotopic approaches to quantify root water uptake: a review and comparison of methods

2017

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Abstract. Plant root water uptake (RWU) has been documented for the past five decades from water stable isotopic analysis. By comparing the (hydrogen or oxygen) stable isotopic compositions of plant xylem water to those of potential contributive water sources (e.g., water from different soil layers, groundwater, water from recent precipitation or from a nearby stream), studies were able to determine the relative contributions of these water sources to RWU. In this paper, the different methods used for locating/quantifying relative contributions of water sources to RWU (i.e., graphical inference, statistical (e.g., Bayesian) multi-source linear mixing models) are reviewed with emphasis on their respective advantages and drawbacks. The graphical and statistical methods are tested against a physically based analytical RWU model during a series of virtual experiments differing in the depth of the groundwater table, the soil surface water status, and the plant transpiration rate value. The benchmarking of these methods illustrates the limitations of the graphical and statistical methods while it underlines the performance of one Bayesian mixing model. The simplest two-end-member mixing model is also successfully tested when all possible sources in the soil can be identified to define the two end-members and compute their isotopic compositions. Finally, the authors call for a development of approaches coupling physically based RWU models with controlled condition experimental setups.

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Section: Introductionmentioning

confidence: 99%

Reviews and syntheses: Isotopic approaches to quantify root water uptake: a review and comparison of methods

2017

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“…40) depends on the water potential gradients. Changes in the direction of flow therefore depend on the local soil water supply, which can differ significantly in soil layers at different depths , 2012b, David et al 2013 or if water storage is highly asymmetrical around the tree ). Deep soil layers can supply water to shallow soil layers via tap or sinker roots under drought if they contain more water.…”

Section: Open Field-applicable Methods For Whole Trees and Standsmentioning

confidence: 99%

“…27, fourth panel). More details are provided in , Cermák et al (2004), Nadezhdina et al (2012a) and Nadezhdina et al (2012b).…”

Section: Integration Of Sap Flow Across Stemsmentioning

confidence: 99%

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Open field-applicable instrumental methods for structural and functional assessment of whole trees and stands

Čermák¹,

Nadezhdina²,

Trcala³

et al. 2015

iForest

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© iForest -Biogeosciences and Forestry Introduction 1Proper management of forest ecosystems from a biological perspective is dependent on classification of the natural environment for the purposes of phytotechnology (e.g., thinning operations) and forestry management. Functional management goals may include timber production as well as other important functions of forests in the landscape, such as water sources for people, but also for control of climate, maintenance of biological diversity, recreation, etc. for which importance often increases with time. Such functions have been working automatically in the past, but serious environmental impacts on forests associated with anthropogenic activities (e.g., air pollution, soil acidification) and global climatic change became apparent at the end of the 20 th century.Therefore long-term experience of foresters should be supplemented with additional objective information, which may be used to help solve new problems. This includes application of modern electronics, computers and other technologies, as well as collection of necessary data in the field especially pertaining to ecophysiology. This review provides only a brief description of methods suitable for studies at the whole tree and stand levels (and even higher levels). The methods are applicable under open forest conditions using mobile instrumentation approaches that can be used almost everywhere. They were tested in more than 60 sites and in over 50 woody species in Europe, USA and Australia. We focused on measurement and evaluation of macrostructure and water flow, because the maximum energy flow in ecosystems goes through water and water is the most frequent natural limiting factor of tree growth and functional states of whole trees and stands (if not considering polar regions and tops of high mountains). Ecologically oriented scientific fields and practically oriented field activities in forestry, arboristics, horticulture, hydrology, remote sensing and forensic engineering use many traditional and modern methods.Annual and seasonal stem growth are probably the most frequently studied processes in forestry. Usually institutions for forest management (IFM) base their practices on this valuable data on a large scale (e.g., national), which provide crucial information about timber production and yield. A great body of literature is available on this topic. However, strategy for the management of forest ecosystems in Europe elaborated over several centuries is focused on classification of the natural environment and determining potential natural vegetation and oriented not only toward production but also on preserving other important functions of forests in the landscape. A detailed version of this approach was successfully applied for over 80 years. The eventual impact of anthropogenic activities and global climatic changes led to development of ecophysiological methods applied to evaluate the functional state and development of forest ecosystems.These methods were usually overlooked in the past because prev...

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“…Among the agronomic sustainable practices, the input of soil organic matter as compost in olive orchards is one of the most important factors affecting soil fertility in terms of enhancement of soil permeability and water retention, better endowment and availability of nutrients for plants, higher CO 2 uptake and carbon fixation, and reduction of soil erosion (Toscano et al, 2008;Toscano et al, 2009;Diacono and Montemurro, 2010;Boughalleb and Hajlaoui, 2011;Martín-Vertedor et al, 2011a,b;Nadezhdina et al, 2012;Tunahoglu and Durdu, 2012;García et al, 2013;Rossi et al, 2013;Tomás et al, 2013;Torres-Ruiz et al, 2013a,b).…”

Section: Using In Situ Compost Productionmentioning

confidence: 99%