Plant and microbial uptake of nitrogen and phosphorus affected by drought using 15N and 32P tracers

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dc.contributor.authorDijkstra, FAen_AU
dc.contributor.authorHe, MZen_AU
dc.contributor.authorJohansen, MPen_AU
dc.contributor.authorHarrison, JJen_AU
dc.contributor.authorKeitel, Cen_AU
dc.date.accessioned2023-01-12T00:26:27Zen_AU
dc.date.available2023-01-12T00:26:27Zen_AU
dc.date.issued2015-03en_AU
dc.date.statistics2022-10-03en_AU
dc.description.abstractCompetition for nutrients between plants and microbes is an important determinant for plant growth, biodiversity and carbon cycling. Perturbations such as drought affect the availability of nitrogen (N) and phosphorus (P), and may cause shifts in uptake of N and P between plants and microbes. Competitiveness for these nutrients may depend on how flexible plants and microbes are in taking up N and P. We used a novel dual isotope labelling technique (15N and 32P) to assess short-term uptake of N and P by plants and microbes affected by drought in two different plant–soil systems. Mesocosms were extracted from two grassland sites differing in soil nutrient availability and plant species. Half of the mesocosms were subjected to drought one week prior to injection of 15N (as KNO3) and 32P (as H3PO4) tracers. Uptake rates of NO3- and P in plants and microbes were estimated based on average source pool enrichment during the labelling period and on plant and microbial recovery of 15N and 32P measured after 4 days of labelling. Overall competition for N and P was reduced with drought as less NO3- and P was taken up in plants and microbes. However, plant NO3-uptake of was more sensitive to drought than microbial NO3- uptake, while microbial P uptake was more sensitive than plant P uptake. These different sensitivities to drought by plants and microbes may decouple the N and P cycle with increased drought conditions. © 2015 Elsevier Ltden_AU
dc.description.sponsorshipThis work was supported by the Australian Research Council (FT100100779) and the National Natural Science Foundation of China (Grant No. 41101054).en_AU
dc.identifier.citationDijkstra, F. A., He, M., Johansen, M. P., Harrison, J. J., & Keitel, C. (2015). Plant and microbial uptake of nitrogen and phosphorus affected by drought using 15N and 32P tracers. Soil Biology and Biochemistry, 82, 135-142. doi:10.1016/j.soilbio.2014.12.021en_AU
dc.identifier.issn0038-0717en_AU
dc.identifier.journaltitleSoil Biology and Biochemistryen_AU
dc.identifier.pagination135-142en_AU
dc.identifier.urihttps://doi.org/10.1016/j.soilbio.2014.12.021en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/14316en_AU
dc.identifier.volume82en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectPlantsen_AU
dc.subjectMicroorganismsen_AU
dc.subjectSoilsen_AU
dc.subjectTracer techniquesen_AU
dc.subjectNitrogenen_AU
dc.subjectPhosphorusen_AU
dc.subjectDroughtsen_AU
dc.subjectBiomassen_AU
dc.subjectStoichiometryen_AU
dc.titlePlant and microbial uptake of nitrogen and phosphorus affected by drought using 15N and 32P tracersen_AU
dc.typeJournal Articleen_AU
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