Depleted 15N in hydrolysable-N of arctic soils and its implication for mycorrhizal fungi–plant interaction

Yano, Yuriko; Shaver, Gaius R.; Giblin, Anne E.; Rastetter, Edward B.

doi:10.1007/s10533-009-9365-1

Cited by 29 publications

(33 citation statements)

References 51 publications

(80 reference statements)

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“…4). This result points to a role of the available N forms in controlling 15 N through the relative concentration of ON compounds that are suggested to be depleted in 15 N (Yano et al 2009). At the same time, the fact that the δ 15 N of graminoids decreases with increasing relative ON availability supports previous observations that in N-limited environments non-mycorrhizal plants, such as our study graminoids (Wang and Qiu 2006;Akhmetzhanova et al 2012), can absorb low molecular weight organic N from the soil solution (Chapin et al 1993;Emmerton et al 2001).…”

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

confidence: 81%

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 Signamentioning

confidence: 81%

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

et al. 2015

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“…Evergreen and deciduous shrubs are typically much more depleted in 15 N than graminoids and forbs (Schulze et al, 1994;Nadelhoffer et al, 1996;Valentine et al, 2006;Yano et al, 2010). The differences in d…”

Section: Discussionmentioning

confidence: 99%

“…N values of plant growth forms found on the Seward Peninsula may be attributed to different rooting depths tapping N pools associated with soil horizon (Gebauer and Schulze, 1991), mycorrhizal association (Michelson et al, 1996;Hobbie and Hobbie, 2006), or form of N absorbed (Kielland and Chapin, 1992;Kielland, 1997;Yano et al, 2010).…”

mentioning

confidence: 99%

Landscape Variation in the Diet and Productivity of Reindeer in Alaska Based on Stable Isotope Analyses

Finstad¹,

Kielland

2011

Arctic, Antarctic, and Alpine Research

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“…A later study divided the bulk soil N into inorganic and organic fractions that differ in their isotopic values. Hydrolysable amino acids were as much as 10 ‰ less than other fractions in bulk soil (Yano et al 2010). Using the …”

Section: Nitrogen Uptakementioning

confidence: 99%

Ecological interpretations of nitrogen isotope ratios of terrestrial plants and soils

et al. 2015

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Background Knowledge of biological and climatic controls in terrestrial nitrogen (N) cycling within and across ecosystems is central to understanding global patterns of key ecosystem processes. The ratios of 15 N: 14 N in plants and soils have been used as indirect indices of N cycling parameters, yet our understanding of controls over N isotope ratios in plants and soils is still developing. Scope In this review, we provide background on the main processes that affect plant and soil N isotope ratios. In a similar manner to partitioning the roles of state factors and interactive controls in determining ecosystem traits, we review N isotopes patterns in plants and soils across a number of proximal factors that influence ecosystem properties as well as mechanisms that affect these patterns. Lastly, some remaining questions that would improve our understanding of N isotopes in terrestrial ecosystems are highlighted. Conclusion Compared to a decade ago, the global patterns of plant and soil N isotope ratios are more resolved. Additionally, we better understand how plant and soil N isotope ratios are affected by such factors as mycorrhizal fungi, climate, and microbial processing. A comprehensive understanding of the N cycle that ascribes different degrees of isotopic fractionation for each step under different conditions is closer to being realized, but a number of process-level questions still remain.

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Depleted 15N in hydrolysable-N of arctic soils and its implication for mycorrhizal fungi–plant interaction

Cited by 29 publications

References 51 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

Landscape Variation in the Diet and Productivity of Reindeer in Alaska Based on Stable Isotope Analyses

Ecological interpretations of nitrogen isotope ratios of terrestrial plants and soils

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