Inorganic nitrogen assimilation in plants of Austrlian rainforest communities

Stewart, George R.; Hegarty, Elwyn E.

doi:10.1111/j.1399-3054.1988.tb04936.x

Cited by 67 publications

(58 citation statements)

References 28 publications

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“…Evidence from a variety of ecosystems indicates that N-partitioning through preferential uptake of particular N forms is not uncommon. Early and late successional tree species have been found to display differential uptake of NO À 3 versus NH þ 4 , respectively, which, due to variation in the availability of these N-forms along successional gradients, affects tree distributions (Stewart et al 1988;Kronzucker et al 1997;Aidar et al 2003). In N-limited arctic and alpine tundra plant communities, species composition was found to correlate with the partitioning of differentially available forms of N, with dominance being linked to a species' ability to exploit the most abundant N-form (McKane et al 2002;Ashton et al 2010).…”

Section: Introductionmentioning

confidence: 99%

Nitrogen uptake strategies of edaphically specialized Bornean tree species

et al. 2013

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The association of tree species with particular soil types contributes to high b diversity in forests, but the mechanisms producing such distributions are still debated. Soil nitrogen (N) often limits growth and occurs in differentially available chemical forms. In a Bornean forest where tree species composition changes dramatically along a soil gradient varying in supplies of different N-forms, we investigated whether tree species' N-uptake and soil specialization strategies covaried. We analyzed foliar 15 N natural abundance for a total of 216 tree species on clay or sandy loam (the soils at the gradient's extremes) and conducted a 15 N-tracer experiment with nine specialist and generalist species to test whether species displayed flexible or differential uptake of ammonium and nitrate. Despite variation in ammonium and nitrate supplies and nearly 4 % difference in foliar d 15 N between most soil specialists and populations of generalists on these soils, our 15

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Section: Introductionmentioning

confidence: 99%

Nitrogen uptake strategies of edaphically specialized Bornean tree species

et al. 2013

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“…Studies showed that, in general, pioneer species, such as Cgl, have a preference for N-NO − 3 as their nitrogen source and have high levels of NRA. However, secondary species, such as Ima and Hco, have relatively low levels of this enzyme and a lower affinity for N-NO − 3 (Stewart et al, 1988(Stewart et al, , 1990Aidar et al, 2003;Pereira-Silva et al, 2011). Therefore, we highlight that variables such as NRA in plants and soil N-NO − 3 content can indicate the form of nitrogen nutrition appropriate for ecological restoration projects.…”

Section: Discussionmentioning

confidence: 99%

The soil-plant relationship of nitrogen use in three tropical tree species

Pereira-Silva¹,

Hardt²,

Fernandes³

2012

Web Ecol.

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Abstract.We characterized and compared the use of nitrate (N-NO − 3 ), in three recognized pioneer and secondary tropical species, analyzing their relationships with the availability of inorganic nitrogen in the soil of a riparian forest. We tested the hypothesis that pioneer species of the ecological succession (Cecropia glaziovi -Cgl) would be more responsive to N-NO − 3 available and would have high nitrate reductase activity (NRA) in leaves while secondary species (Inga marginata -Ima and Hymenaea courbaril -Hco) would have less responsiveness and would have lower levels of this enzyme on its leaves. We evaluated, tested and compared the NRA and N-NO . In this sense and considering that these species are typically used in ecological restoration projects in Brazil, the knowledge of a strategy for nitrogen use specific to each of them can assist in choosing the species appropriate to the edaphic conditions of the environment.

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“…Trees differ in their ability to assimilate nitrate in their leaves (Smirnoff et al, 1984 (Stewart et al, 1988 (Fig. 1 ).…”

Section: Introductionmentioning

confidence: 99%