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The two water worlds hypothesis : addressing multiple working hypotheses and proposing a way forward

(2018) ECOHYDROLOGY. 11(3).
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Abstract
Recent studies using water isotopes have shown that trees and streams appear to return distinct water pools to the hydrosphere. Cryogenically extracted plant and soil water isotopic signatures diverge from the meteoric water lines, suggesting that plants would preferentially use bound soil water, while mobile soil water that infiltrates the soil recharges groundwater and feeds streamflow all plots on meteoric water lines. These findings have been described under the “two water worlds” (TWW) hypothesis. In spite of growing evidence for the TWW hypothesis, several questions remain unsolved within the scope of this framework. Here, we address the TWW as a null hypothesis and further assess the following: (a) the theoretical biophysical feasi- bility for two distinct water pools to exist, (b) plant and soil processes that could explain the dif- ferent isotopic composition between the two water pools, and (c) methodological issues that could explain the divergent isotopic signatures. Moreover, we propose a way forward under the framework of the TWW hypothesis, proposing alternative perspectives and explanations, experiments to further test them, and methodological advances that could help illuminate this quest. We further highlight the need to improve our sampling resolution of plants and soils across time and space. We ultimately propose a set of key priorities for future research to improve our understanding of the ecohydrological processes controlling water flows through the soil–plant‐ atmosphere continuum.
Keywords
bulk soil water, ecohydrological separation, preferential flow, stable isotopes, two‐domain flow, STABLE-ISOTOPE ANALYSIS, STEM DIAMETER VARIATIONS, MONTANE CLOUD FOREST, SOIL-WATER, PLANT WATER, VACUUM EXTRACTION, PHYSIOLOGICAL CONTROLS, RADIAL TRANSFER, FOLIAR UPTAKE, TRANSPORT

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Citation

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Chicago
Berry, Z Carter, Jaivime Evaristo, Georgianne Moore, María Poca, Kathy Steppe, Lucile Verrot, Heidi Asbjornsen, et al. 2018. “The Two Water Worlds Hypothesis : Addressing Multiple Working Hypotheses and Proposing a Way Forward.” Ecohydrology 11 (3).
APA
Berry, Z. C., Evaristo, J., Moore, G., Poca, M., Steppe, K., Verrot, L., Asbjornsen, H., et al. (2018). The two water worlds hypothesis : addressing multiple working hypotheses and proposing a way forward. ECOHYDROLOGY, 11(3).
Vancouver
1.
Berry ZC, Evaristo J, Moore G, Poca M, Steppe K, Verrot L, et al. The two water worlds hypothesis : addressing multiple working hypotheses and proposing a way forward. ECOHYDROLOGY. 2018;11(3).
MLA
Berry, Z Carter, Jaivime Evaristo, Georgianne Moore, et al. “The Two Water Worlds Hypothesis : Addressing Multiple Working Hypotheses and Proposing a Way Forward.” ECOHYDROLOGY 11.3 (2018): n. pag. Print.
@article{8521195,
  abstract     = {Recent studies using water isotopes have shown that trees and streams appear to return distinct water pools to the hydrosphere. Cryogenically extracted plant and soil water isotopic signatures diverge from the meteoric water lines, suggesting that plants would preferentially use bound soil water, while mobile soil water that infiltrates the soil recharges groundwater and feeds streamflow all plots on meteoric water lines. These findings have been described under the {\textquotedblleft}two water worlds{\textquotedblright} (TWW) hypothesis. In spite of growing evidence for the TWW hypothesis, several questions remain unsolved within the scope of this framework. Here, we address the TWW as a null hypothesis and further assess the following: (a) the theoretical biophysical feasi- bility for two distinct water pools to exist, (b) plant and soil processes that could explain the dif- ferent isotopic composition between the two water pools, and (c) methodological issues that could explain the divergent isotopic signatures. Moreover, we propose a way forward under the framework of the TWW hypothesis, proposing alternative perspectives and explanations, experiments to further test them, and methodological advances that could help illuminate this quest. We further highlight the need to improve our sampling resolution of plants and soils across time and space. We ultimately propose a set of key priorities for future research to improve our understanding of the ecohydrological processes controlling water flows through the soil--plant\unmatched{2010} atmosphere continuum.},
  articleno    = {e1843},
  author       = {Berry, Z Carter and Evaristo, Jaivime and Moore, Georgianne and Poca, Mar{\'i}a and Steppe, Kathy and Verrot, Lucile and Asbjornsen, Heidi and Borma, Laura S and Bretfeld, Mario and Herv{\'e} Fern{\'a}ndez, Pedro Alejandro and Seyfried, Mark and Schwendenmann, Luitgard and Sinacore, Katherine and De Wispelaere, Lien and McDonnell, Jeffrey},
  issn         = {1936-0584},
  journal      = {ECOHYDROLOGY},
  language     = {eng},
  number       = {3},
  pages        = {10},
  title        = {The two water worlds hypothesis : addressing multiple working hypotheses and proposing a way forward},
  url          = {http://dx.doi.org/10.1002/eco.1843},
  volume       = {11},
  year         = {2018},
}

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