Foliar nitrogen dynamics of an invasive legume compared to native non-legumes in fynbos riparian zones varying in water availability

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dc.contributor.authorCrous, Casparus J.en_ZA
dc.contributor.authorDrake, Deanne C.en_ZA
dc.contributor.authorJacobsen, Anna L.en_ZA
dc.contributor.authorPratt, R. Brandonen_ZA
dc.contributor.authorJacobs, Shayne M.en_ZA
dc.contributor.authorEsler, Karen J.en_ZA
dc.date.accessioned2019-03-11T10:58:24Z
dc.date.accessioned2021-08-27T12:44:24Z
dc.date.available2019-03-11T10:58:24Z
dc.date.available2021-08-27T12:44:24Z
dc.date.issued2019
dc.descriptionCITATION: Crous, C. J. et al. 2019. Foliar nitrogen dynamics of an invasive legume compared to native non-legumes in fynbos riparian zones varying in water availability. Water SA, 45(1): 103-109, doi:10.4314/wsa.v45i1.12.
dc.description.abstractThe legume Acacia mearnsii invades South Africa’s fynbos riparian zones and may alter the nitrogen (N) dynamics and supply in these areas that typically support few native N fixers. Nitrogen uptake by A. mearnsii may also be influenced by water availability, potentially affecting riparian-specific performance and impact estimations. We expected to find functional differences between the invasive legume and the two co-occurring but non-leguminous native species Brabejum stellatifolium and Metrosideros angustifolia. We also wanted to examine whether in-situ water availability affected N source or uptake in the invasive species. We found A. mearnsii was indeed functioning differently from non-N-fixing native species, and had considerably higher foliar %N. Interestingly, 15N abundance and uptake were associated with site hydrology, meaning water availability should be scrutinised when assuming N-fixing in A. mearnsii using δ15N. Nonetheless, higher water availability to A. mearnsii in fynbos riparian ecosystems did increase foliar N uptake. This has implications for prioritizing clearing of sites with increased nutrient deposition, such as dense stands in relatively moist riparian zones.en_ZA
dc.description.versionPublisher's version
dc.format.extent7 pagesen_ZA
dc.identifier.citationCrous, C.J.; Drake, D.C.; Jacobsen, A.L.; Pratt, R.B.; Jacobs, S.M.; Esler, K.J. (2019) Foliar nitrogen dynamics of an invasive legume compared to native non-legumes in fynbos riparian zones varying in water availability. WaterSA, 45(1): 103-109en_ZA
dc.identifier.issn0378-4738en_ZA
dc.identifier.urihttp://hdl.handle.net/10019.1/121475
dc.language.isoenen_ZA
dc.publisherSouth African Water Research Commission
dc.rights.holderAuthors retain copyright
dc.subject.lcshAcacia mearnsii -- South Africaen_ZA
dc.subject.lcshBrabejum stellatifolium -- South Africa -- Identificationen_ZA
dc.subject.lcshMetrosideros angustifolia -- South Africa -- Identificationen_ZA
dc.subject.lcshWattles (Plants)en_ZA
dc.subject.lcshNitrogen -- Fixationen_ZA
dc.subject.lcshLegumes -- Fertilizersen_ZA
dc.subject.lcshLegumes -- Effect of stress onen_ZA
dc.subject.lcshWater -- Nitrogen contenten_ZA
dc.subject.lcshWater levelsen_ZA
dc.titleFoliar nitrogen dynamics of an invasive legume compared to native non-legumes in fynbos riparian zones varying in water availabilityen_ZA
dc.typeArticleen_ZA
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