Diel plant water use and competitive soil cation exchange interact to enhance NH4 + and K+ availability in the rhizosphere
Abstract
Hydro-biogeochemical processes in the rhizosphere regulate nutrient and water availability, and thus ecosystem productivity. We hypothesized that two such processes often neglected in rhizosphere models — diel plant water use and competitive cation exchange — could interact to enhance availability of K+ and NH4 +, both high-demand nutrients. A rhizosphere model with competitive cation exchange was used to investigate how diel plant water use (i.e., daytime transpiration coupled with no nighttime water use, with nighttime root water release, and with nighttime transpiration) affects competitive ion interactions and availability of K+ and NH4+. Competitive cation exchange enabled lowdemand cations that accumulate against roots (Ca2+, Mg2+, Na+) to desorb NH4 + and K+ from soil, generating non-monotonic dissolved concentration profiles (i.e. ‘hotspots’ 0.1–1 cm from the root). Cation accumulation and competitive desorption increased with net root water uptake. Daytime transpiration rate controlled diel variation in NH4+ and K+ aqueous mass, nighttime water use controlled spatial locations of ‘hotspots’, and day-to-night differences in water use controlled diel differences in ‘hotspot’ concentrations. Finally, diel plant water use and competitive cation exchange enhanced NH4+ and K+ availability and influenced rhizosphere concentration dynamics. Demonstrated responses have implications for understanding rhizosphere nutrient cycling and plant nutrient uptake.
- Authors:
- Publication Date:
- Research Org.:
- Marine Biological Lab., Woods Hole, MA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Biological and Environmental Research (BER)
- OSTI Identifier:
- 1332007
- Alternate Identifier(s):
- OSTI ID: 1426163
- Grant/Contract Number:
- SC0008182
- Resource Type:
- Published Article
- Journal Name:
- Plant and Soil
- Additional Journal Information:
- Journal Name: Plant and Soil Journal Volume: 414 Journal Issue: 1-2; Journal ID: ISSN 0032-079X
- Publisher:
- Springer Science + Business Media
- Country of Publication:
- Netherlands
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES; Hydraulic redistribution; Nighttime transpiration; Plant nutrient uptake; Reactive-transport; Rhizosphere; Root water uptake
Citation Formats
Espeleta, Javier F., Cardon, Zoe G., Mayer, K. Ulrich, and Neumann, Rebecca B. Diel plant water use and competitive soil cation exchange interact to enhance NH4 + and K+ availability in the rhizosphere. Netherlands: N. p., 2016.
Web. doi:10.1007/s11104-016-3089-5.
Espeleta, Javier F., Cardon, Zoe G., Mayer, K. Ulrich, & Neumann, Rebecca B. Diel plant water use and competitive soil cation exchange interact to enhance NH4 + and K+ availability in the rhizosphere. Netherlands. https://doi.org/10.1007/s11104-016-3089-5
Espeleta, Javier F., Cardon, Zoe G., Mayer, K. Ulrich, and Neumann, Rebecca B. Sat .
"Diel plant water use and competitive soil cation exchange interact to enhance NH4 + and K+ availability in the rhizosphere". Netherlands. https://doi.org/10.1007/s11104-016-3089-5.
@article{osti_1332007,
title = {Diel plant water use and competitive soil cation exchange interact to enhance NH4 + and K+ availability in the rhizosphere},
author = {Espeleta, Javier F. and Cardon, Zoe G. and Mayer, K. Ulrich and Neumann, Rebecca B.},
abstractNote = {Hydro-biogeochemical processes in the rhizosphere regulate nutrient and water availability, and thus ecosystem productivity. We hypothesized that two such processes often neglected in rhizosphere models — diel plant water use and competitive cation exchange — could interact to enhance availability of K+ and NH4 +, both high-demand nutrients. A rhizosphere model with competitive cation exchange was used to investigate how diel plant water use (i.e., daytime transpiration coupled with no nighttime water use, with nighttime root water release, and with nighttime transpiration) affects competitive ion interactions and availability of K+ and NH4+. Competitive cation exchange enabled lowdemand cations that accumulate against roots (Ca2+, Mg2+, Na+) to desorb NH4 + and K+ from soil, generating non-monotonic dissolved concentration profiles (i.e. ‘hotspots’ 0.1–1 cm from the root). Cation accumulation and competitive desorption increased with net root water uptake. Daytime transpiration rate controlled diel variation in NH4+ and K+ aqueous mass, nighttime water use controlled spatial locations of ‘hotspots’, and day-to-night differences in water use controlled diel differences in ‘hotspot’ concentrations. Finally, diel plant water use and competitive cation exchange enhanced NH4+ and K+ availability and influenced rhizosphere concentration dynamics. Demonstrated responses have implications for understanding rhizosphere nutrient cycling and plant nutrient uptake.},
doi = {10.1007/s11104-016-3089-5},
journal = {Plant and Soil},
number = 1-2,
volume = 414,
place = {Netherlands},
year = {Sat Nov 12 00:00:00 EST 2016},
month = {Sat Nov 12 00:00:00 EST 2016}
}
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