A model for hydraulic redistribution incorporating coupled soil-root moisture transport

Amenu, Geremew G.; Kumar, Praveen

doi:10.5194/hess-12-55-2008

Cited by 146 publications

(78 citation statements)

References 88 publications

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“…Since Caldwell and Richards (1989) first suggested that HL could enhance transpiration rates in A. tridentata, a number of studies have addressed the influence of HL or hydraulic redistribution on plant water balance of phreatophyte species both experimentally (Burgess et al 2000) or using models (Amenu and Kumar 2008;Ryel et al 2002). A correlation between increased transpiration rates and reverse root sap flow was found in Prosopis velutina trees suggesting that deep stored water through hydraulic redistribution would allow higher transpiration the next day (Scott et al 2008).…”

Section: Discussionmentioning

confidence: 97%

Hydraulic lift: soil processes and transpiration in the Mediterranean leguminous shrub Retama sphaerocarpa (L.) Boiss

2009

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Hydraulic lift (HL) is the process by which plants can passively transfer water from deep, moist soil layers to shallow, dry soil layers. Although it has attracted recent research interest, a mechanistic understanding and its implications for ecosystem functioning are still lacking. Here we describe HL seasonal patterns in a semi-arid shrub species and its influence on plant water dynamics. We measured soil water availability and plant water status over the course of 1 year. Soil water potential in the rhizosphere of Retama sphaerocarpa (L.) Boiss (Fabaceae) individuals and in adjacent land was recorded using soil psychrometers. Sap flow was recorded simultaneously using the stem heat balance method (SHBM). Our results show a seasonal HL trend linked to mean seasonal soil water potential with greatest HL amplitudes at moderately low water potentials (ca −4 MPa). HL amplitude was negatively affected by nocturnal transpiration, and HL patterns were recorded in all seasons and at water potentials ranging from −0.

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Section: Discussionmentioning

confidence: 97%

Hydraulic lift: soil processes and transpiration in the Mediterranean leguminous shrub Retama sphaerocarpa (L.) Boiss

2009

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“…This means that hydraulic redistribution is a widespread phenomenon that seems to be the rule rather than the exception in terrestrial ecosystems. Apart from its importance at the physiological level (Snyder et al 2008;Warren et al 2008), the potential effect of this phenomenon has attracted recent attention because of its consequences at the community and ecosystem levels (Lee et al 2005;Amenu and Kumar 2008;Nadezhdina et al 2008;Scott et al 2008). At the ecosystem scale, HL can modify the seasonal microclimate by increasing transpiration during dry periods (Lee et al 2005).…”

Section: Introductionmentioning

confidence: 99%

Hydraulic lift through transpiration suppression in shrubs from two arid ecosystems: patterns and control mechanisms

et al. 2010

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Hydraulic lift (HL) is the passive movement of water through the roots from deep wet to dry shallow soil layers when stomata are closed. HL has been shown in different ecosystems and species, and it depends on plant physiology and soil properties. In this study we explored HL patterns in several arid land shrubs, and developed a simple model to simulate the temporal evolution and magnitude of HL during a soil drying cycle under relatively stable climatic conditions. This model was then used to evaluate the influence of soil texture on the quantity of water lifted by shrubs in different soil types. We conducted transpiration suppression experiments during spring 2005 in Chile and spring 2008 in Spain on five shrub species that performed HL, Flourensia thurifera, Senna cumingii and Pleocarphus revolutus (Chile), Retama sphaerocarpa and Artemisia barrelieri (Spain). Shrubs were covered with a black, opaque plastic fabric for a period of 48-72 h, and soil water potential was recorded at different depths under the shrubs. While the shrubs remained covered, water potential continuously increased in shallow soil layers until the cover was removed. The model output indicated that the amount of water lifted by shrubs is heavily dependent on soil texture, as shrubs growing in loamy soils redistributed up to 3.6 times more water than shrubs growing on sandy soils. This could be an important consideration for species growing in soils with different textures, as their ability to perform HL would be context dependent.

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“…For example, recognizing the role of deep roots in the function of the soil-plant-atmosphere continuum, researchers are now begin to investigate "new" processes including hydraulic redistribution (e.g. Lee et al, 2005;Amenu and Kumar, 2008;Wang, 2011;Quijano et al, 2012;Prentice and Cowling, 2013), plant water storage (e.g. Luo et al, 2013), surface water and groundwater interactions (e.g.…”

Section: Bounding Complexity: the Use Of Multiple Constraintsmentioning

confidence: 99%

Reliable, robust and realistic: the three R's of next-generation land-surface modelling

et al. 2015

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Abstract. Land-surface models (LSMs) are increasingly called upon to represent not only the exchanges of energy, water and momentum across the land-atmosphere interface (their original purpose in climate models), but also how ecosystems and water resources respond to climate, atmospheric environment, land-use and land-use change, and how these responses in turn influence land-atmosphere fluxes of carbon dioxide (CO 2 ), trace gases and other species that affect the composition and chemistry of the atmosphere. However, the LSMs embedded in state-of-the-art climate models differ in how they represent fundamental aspects of the hydrological and carbon cycles, resulting in large inter-model differences and sometimes faulty predictions. These "thirdgeneration" LSMs respect the close coupling of the carbon and water cycles through plants, but otherwise tend to be under-constrained, and have not taken full advantage of robust hydrological parameterizations that were independently developed in offline models. Benchmarking, combining multiple sources of atmospheric, biospheric and hydrological data, should be a required component of LSM development, but this field has been relatively poorly supported and intermittently pursued. Moreover, benchmarking alone is not sufficient to ensure that models improve. Increasing complexity may increase realism but decrease reliability and robustness, by increasing the number of poorly known model parameters. In contrast, simplifying the representation of complex processes by stochastic parameterization (the representation of unresolved processes by statistical distributions of values) has been shown to improve model reliability and realism in both atmospheric and land-surface modelling contexts. We provide examples for important processes in hydrology (the generation of runoff and flow routing in heterogeneous catchments) and biology (carbon uptake by speciesdiverse ecosystems). We propose that the way forward for next-generation complex LSMs will include: (a) representations of biological and hydrological processes based on the implementation of multiple internal constraints; (b) systematic application of benchmarking and data assimilation techniques to optimize parameter values and thereby test the structural adequacy of models; and (c) stochastic parameterization of unresolved variability, applied in both the hydrological and the biological domains.

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A model for hydraulic redistribution incorporating coupled soil-root moisture transport

Cited by 146 publications

References 88 publications

Hydraulic lift: soil processes and transpiration in the Mediterranean leguminous shrub Retama sphaerocarpa (L.) Boiss

Hydraulic lift: soil processes and transpiration in the Mediterranean leguminous shrub Retama sphaerocarpa (L.) Boiss

Hydraulic lift through transpiration suppression in shrubs from two arid ecosystems: patterns and control mechanisms

Reliable, robust and realistic: the three R's of next-generation land-surface modelling

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