Nitrogen isotope signature variability in plant species from open peatland

Asada, Taro; Warner, Barry G.; Aravena, Ramón

doi:10.1016/j.aquabot.2005.05.005

Cited by 66 publications

(54 citation statements)

References 26 publications

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“…The consistently lower δ 15 N value of ericoid leaves compared to graminoids throughout the growing season and across all the studied peatlands is in line with the previously reported role of ericoid mycorrhizal symbiosis in controlling the 15 N signature of host plants (Nadelhoffer et al 1996;Evans 2001;Asada et al 2005;Craine et al 2009;Hobbie and Högberg 2012). Indeed, 15 N-depleted N is preferentially transferred to the host plants from the symbiotic fungi, resulting in an enrichment of 15 N in the fungal mycelium and a depletion in the host plant (Emmerton et al 2001;Robinson 2001;Hobbie and Colpaert 2003).…”

Section: Spatial and Temporal Pattern Of 13 C And 15 N Isotopic Signasupporting

confidence: 82%

“…In nutrient-poor ecosystems such as ombrotrophic peatlands, isotopic composition of plant tissues can potentially reflect differences in acquisition strategies by different species or, more generally, by different plant growth forms (PGFs) (Asada et al 2005;Aerts et al 2009). PGFs typical of peatlands have been shown to be consistent in their function (Dorrepaal 2007), nutrient-acquisition strategies (Nadelhoffer et al 1996), and responses to climate change (Elmendorf et al 2012).…”

Section: Introductionmentioning

confidence: 99%

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Environmental drivers of carbon and nitrogen isotopic signatures in peatland vascular plants along an altitude gradient

et al. 2015

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Peatlands are important sinks of atmospheric carbon (C) that, in response to climate warming, are undergoing dynamic vegetation succession. Here we examined the hypothesis that the uptake of nutrients by different plant growth forms (PGFs) is one key mechanism driving changes in species abundance in peatlands. Along an altitude gradient representing a natural climate experiment, we compared the variability of the stable C isotope composition (δ(13)C) and stable nitrogen (N) isotope composition (δ(15)N) in current-year leaves of two major PGFs, i.e. ericoids and graminoids. The climate gradient was associated with a gradient of vascular plant cover, which was parallelled by different concentrations of organic and inorganic N as well as the fungal/bacterial ratio in peat. In both PGFs the (13)C natural abundance showed a marginal spatial decrease with altitude and a temporal decrease with progression of the growing season. Our data highlight a primary physical control of foliar δ(13)C signature, which is independent from the PGFs. Natural abundance of foliar (15)N did not show any seasonal pattern and only in the ericoids showed depletion at lower elevation. This decreasing δ(15)N pattern was primarily controlled by the higher relative availability of organic versus inorganic N and, only for the ericoids, by an increased proportion of fungi to bacteria in soil. Our space-for-time approach demonstrates that a change in abundance of PGFs is associated with a different strategy of nutrient acquisition (i.e. transfer via mycorrhizal symbiosis versus direct fine-root uptake), which could likely promote observed and predicted dwarf shrub expansion under climate change.

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Section: Spatial and Temporal Pattern Of 13 C And 15 N Isotopic Signasupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Environmental drivers of carbon and nitrogen isotopic signatures in peatland vascular plants along an altitude gradient

et al. 2015

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“…The relatively low leaf nitrogen levels in Drosera spp. (Asada et al 2005), combined with 15 N evidence for heavy reliance on insect as opposed to root-derived nitrogen (Millett et al 2003), would support this contention. In addition, while respiration is generally higher in roots than in leaves (Lambers et al 1998), this may not hold true for carnivorous plants that typically have reduced root systems (Juniper et al 1989), as observed in our Drosera spp.…”

Section: Discussionmentioning

confidence: 58%

Photosynthetic light response in three carnivorous plant species: Drosera rotundifolia, D. capensis and Sarracenia leucophylla

Bruzzese¹,

Bowler²,

Massicotte³

et al. 2010

Photosynt.

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Photosynthetic properties of carnivorous plants have not been well characterized and the extent to which photosynthesis contributes to carbon gain in most carnivorous plants is also largely unknown. We investigated the photosynthetic light response in three carnivorous plant species, Drosera rotundifolia L. (sundew; circumpolar and native to northern British Columbia, Canada), Sarracenia leucophylla Rafin. ('pitcher-plant'; S.E. United States), and D. capensis L. (sundew; Cape Peninsula, South Africa), using portable gas-exchange systems to explore the capacity for photosynthetic carbon gain in carnivorous plant species. Maximal photosynthetic rates (1.32-2.22 µmol m -2 s -1 on a leaf area basis) and saturating light intensities (100 to 200 µmol PAR m -2 s -1 ) were both low in all species and comparable to shade plants. Field or greenhouse-grown D. rotundifolia had the highest rates of photosynthesis among the three species examined. Dark respiration, ranging from -1.44 (S. leucophylla) to -3.32 (D. rotundifolia) µmol m -2 s -1 was high in comparison to photosynthesis in the species examined. Across greenhouse-grown plants, photosynthetic light compensation points scaled with light-saturated photosynthetic rates. An analysis of gas-exchange and growth data for greenhouse-grown D. capensis plants suggests that photosynthesis can account for all plant carbon gain in this species.

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“…It is well known that plant species co-occurring in nutritionally stressed environments, as we observed in this study, may tap several sources of available N that in turn may have distinct 15 N isotopic compositions (Schulze et al 1994;Nadelhoffer et al 1996;Handley and Scrimgeour 1994;Chapin et al 1986;Asada et al 2002;Bustamante et al 2004;Schmidt et al 2006). For instance, Bustamante et al (2004) observed a wide range of depleted foliar d 15 N values in N-limited savannas of Central Brazil.…”

Section: Differences In N Strategy Among Species In White-sand Vegetamentioning

confidence: 63%

Nitrogen availability patterns in white-sand vegetations of Central Brazilian Amazon

Mardegan

Nardoto

Higuchi

et al. 2008

Trees

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Addressing spatial variability in nitrogen (N) availability in the Central Brazilian Amazon, we hypothesized that N availability varies among white-sand vegetation types (campina and campinarana) and lowland tropical forests (dense terra-firme forests) in the Central Brazilian Amazon, under the same climate conditions. Accordingly, we measured soil and foliar N concentration and N isotope ratios (d 15 N) throughout the campinacampinarana transect and compared to published dense terra-firme forest results. There were no differences between white-sand vegetation types in regard to soil N concentration, C:N ratio and d 15 N across the transect. Both white-sand vegetation types showed very low foliar N concentrations and elevated foliar C:N ratios, and no significant difference between site types was observed. Foliar d 15 N was depleted, varying from -9.6 to 1.6% in the white-sand vegetations. The legume Aldina heterophylla had the highest average d 15 N values (-1.5%) as well as the highest foliar N concentration (2.1%) while the nonlegume species had more depleted d 15 N values and the average foliar N concentrations varied from 0.9 to 1.5% among them. Despite the high variation in foliar d 15 N among plants, a significant and gradual 15 N-enrichment in foliar isotopic signatures throughout the campina-campinarana transect was observed. Individual plants growing in the campinarana were significantly enriched in 15 N compared to those in campina. In the white-sand N-limited ecosystems, the differentiation of N use seems to be a major cause of variations observed in foliar d 15 N values throughout the campina-campinarana transect.

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Nitrogen isotope signature variability in plant species from open peatland

Cited by 66 publications

References 26 publications

Environmental drivers of carbon and nitrogen isotopic signatures in peatland vascular plants along an altitude gradient

Environmental drivers of carbon and nitrogen isotopic signatures in peatland vascular plants along an altitude gradient

Photosynthetic light response in three carnivorous plant species: Drosera rotundifolia, D. capensis and Sarracenia leucophylla

Nitrogen availability patterns in white-sand vegetations of Central Brazilian Amazon

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