Re-allocation of nitrogen and phosphorus from roots drives regrowth of grasses and sedges after defoliation under deficit irrigation and nitrogen enrichment

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dc.contributor.authorWang, RZen_AU
dc.contributor.authorCresswell, Ten_AU
dc.contributor.authorJohansen, MPen_AU
dc.contributor.authorHarrison, JJen_AU
dc.contributor.authorJiang, Yen_AU
dc.contributor.authorKeitel, Cen_AU
dc.contributor.authorCavagnaro, TRen_AU
dc.contributor.authorDijkstra, FAen_AU
dc.date.accessioned2021-10-18T04:35:50Zen_AU
dc.date.available2021-10-18T04:35:50Zen_AU
dc.date.issued2021-09-04en_AU
dc.date.statistics2021-09-10en_AU
dc.descriptionThe attached PDF is the postprint version which had undergone full peer review but had not been through the copyediting, typesetting, pagination and proofreading process, which may lead to differences between this version and the Version of Record.en_AU
dc.description.abstract1. Re-allocation of nutrients from roots to shoots is essential for plant regrowth in grasslands, particularly in nutrient-poor conditions. However, the response of root nutrient re-allocation to changes in nitrogen (N) and water availability remains largely unknown. 2. Using a novel 15N and 32P labelling technique, we quantified the contribution of N and phosphorus (P) to shoot regrowth from either root re-allocation or direct soil uptake for perennial grasses exposed to high-frequency deficit irrigation (HFDI) and N addition. 3. Without N addition, HFDI showed no impact on uptake and re-allocation of N and P, likely due to unaffected soil N availability and a greater diffusion barrier offsetting increased accumulation in plant-available soil P. With N addition, HFDI increased plant N rather than P uptake, because of increasing soil N availability instead of P under combined HFDI and N addition. The HFDI decreased both N and P re-allocation with N addition, possibly due to exhaustion of nutrient reserves in roots that were re-allocated aboveground. Re-allocation contributed 48-97% of N and 58-79% of P required during the first two weeks of shoot regrowth. 4. Synthesis. Our results highlight the importance of N and P re-allocation from roots to buffer against changes in soil N and P availability and to maintain N:P ratio in shoot regrowth. © 2021 British Ecological Societyen_AU
dc.identifier.citationWang, R., Cresswell, T., Johansen, M. P., Harrison, J. J., Jiang, Y., Keitel, C., Cavagnaro, T. R. & Dijkstra, F. A. (2021) Re‐allocation of nitrogen and phosphorus from roots drives regrowth of grasses and sedges after defoliation under deficit irrigation and nitrogen enrichment. Journal of Ecology, 109(12), 4071-4080. doi:10.1111/1365-2745.13778 en_AU
dc.identifier.issn1365-2745en_AU
dc.identifier.issue12en_AU
dc.identifier.journaltitleJournal of Ecologyen_AU
dc.identifier.pagination4071-4080en_AU
dc.identifier.urihttps://doi.org/10.1111/1365-2745.13778en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/11998en_AU
dc.identifier.volume109en_AU
dc.language.isoenen_AU
dc.publisherJohn Wiley & Sons, Incen_AU
dc.subjectIrrigationen_AU
dc.subjectSoilsen_AU
dc.subjectPlantsen_AU
dc.subjectRootsen_AU
dc.subjectBiomassen_AU
dc.subjectNitrogenen_AU
dc.subjectPhosphorusen_AU
dc.subjectNutrientsen_AU
dc.subjectWateren_AU
dc.subjectIsotopesen_AU
dc.subjectLabellingen_AU
dc.titleRe-allocation of nitrogen and phosphorus from roots drives regrowth of grasses and sedges after defoliation under deficit irrigation and nitrogen enrichmenten_AU
dc.typeJournal Articleen_AU
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