Plant uptake of nitrogen and phosphorus among grassland species affected by drought along a soil available phosphorus gradient

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dc.contributor.authorMariotte, Pen_AU
dc.contributor.authorCresswell, Ten_AU
dc.contributor.authorJohansen, MPen_AU
dc.contributor.authorHarrison, JJen_AU
dc.contributor.authorKeitel, Cen_AU
dc.contributor.authorDijkstra, FAen_AU
dc.date.accessioned2021-12-22T05:08:25Zen_AU
dc.date.available2021-12-22T05:08:25Zen_AU
dc.date.issued2020-01-10en_AU
dc.date.statistics2021-11-18en_AU
dc.description.abstractAims Here we assessed N and P uptake of four grassland species grown together in response to a short-term drought event along a soil P gradient. Methods We used 15N and 32P tracers to examine uptake of N and P by the grasses Bothriochloa macra, Themeda triandra, Lolium perenne and Microlaena stipoides grown together in pots with initial available P levels of 3, 8, 12, 20 mg P kg−1 soil. Soil moisture in half the pots was reduced from 60 to 30% water holding capacity during a 7-day period to simulate drought. Results Plant P uptake was strongly reduced by drought in all species across all P levels, much more so than N uptake, indicating decoupling in N and P uptake. Soil available P (Bray method) was not affected by drought, suggesting that the reduced P uptake with drought was due to reduced soil P mobility. Plant competition for N and P changed with drought and soil P levels, where relatively more N and P was taken up with drought by M. stipoides at the lowest soil P level. Conclusions We showed that greater reductions in P than in N uptake and shifts in N and P uptake among species caused by a short-term drought have strong consequences for plant growth. © Springer Nature Switzerland AG 2020en_AU
dc.description.sponsorshipThis study was supported by an Australian Institute of Nuclear Science and Engineering Research Award (ALNGRA15209) awarded to FAD in 2015. PM was funded by the Swiss National Science Foundation (n°P300P3_154648).en_AU
dc.identifier.citationMariotte, P., Cresswell, T., Johansen, M. P., Harrison, J. J., Keitel, C., & Dijkstra, F. A. (2020). Plant uptake of nitrogen and phosphorus among grassland species affected by drought along a soil available phosphorus gradient. Plant and Soil, 448, 121-132. doi:10.1007/s11104-019-04407-0en_AU
dc.identifier.issn1573-5036en_AU
dc.identifier.journaltitlePlant and Soilen_AU
dc.identifier.pagination121-132en_AU
dc.identifier.urihttps://doi.org/10.1007/s11104-019-04407-0en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/12636en_AU
dc.identifier.volume448en_AU
dc.language.isoenen_AU
dc.publisherSpringer Natureen_AU
dc.subjectPlantsen_AU
dc.subjectRangelandsen_AU
dc.subjectNutrientsen_AU
dc.subjectHomeostasisen_AU
dc.subjectNitrogenen_AU
dc.subjectPhosphorusen_AU
dc.subjectDroughtsen_AU
dc.subjectStoichiometryen_AU
dc.subjectStable isotopesen_AU
dc.subjectLabellingen_AU
dc.titlePlant uptake of nitrogen and phosphorus among grassland species affected by drought along a soil available phosphorus gradienten_AU
dc.typeJournal Articleen_AU
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