Seasonal variation of 15N/14N ratios in atmospheric nitrate species

Freyer, H. D.

doi:10.1034/j.1600-0889.1991.00003.x

Cited by 132 publications

(168 citation statements)

References 0 publications

Supporting

Mentioning

153

Contrasting

Order By: Relevance

“…As shown in Fig. 1(A), the δ 15 N of these non‐N 2 ‐fixing lichens is extremely negative down to an average of −11‰, probably caused by the absorption of strongly negative airborne N in either gaseous form (ammonia, NO x ) or from rainwater uptake (ammonium/ammonium, nitrate) 34–36. Although natural 15 N figures for lichens in arid regions are unknown, measurements in other regions support our assumption.…”

Section: Discussionsupporting

confidence: 72%

A natural ¹⁵N approach to determine the biological fixation of atmospheric nitrogen by biological soil crusts of the Negev Desert

Russow

Veste

Böhme

2005

Rapid Comm Mass Spectrometry

View full text Add to dashboard Cite

Biological soil crusts are important cryptogamic communities covering the sand dunes of the north-western Negev. The biological crusts contain cyanobacteria and other free-living N(2)-fixing bacteria and are hence able to fix atmospheric nitrogen (N). This is why they are considered to be one of the main N input pathways into the desert ecosystem. However, up to now, in situ determinations of the N(2) fixation in the field are not known to have been carried out. We examined the natural (15)N method to determine the biological N(2) fixation by these soil crusts under field conditions. This novel natural (15)N method uses the lichen Squamarina with symbiotic green algae--which are unable to fix N(2)--as a reference in order to determine N(2) fixation. Depending on the sampling location and year, the relative biological fixation of atmospheric nitrogen was estimated at 84-91% of the total N content of the biological soil crust. The cyanobacteria-containing soil lichen Collema had a fixation rate of about 88%. These fixation rates were used to derive an absolute atmospheric N input of 10-41 kg N ha(-1) year(-1). These values are reasonable results for the fixation of atmospheric N(2) by the biological crusts and cyanolichens and are in agreement with other comparable lab investigations. As far as we are aware, the results presented are the first to have been obtained from in situ field measurements, albeit only one location of the Negev with a small number of samples was investigated.

show abstract

Section: Discussionsupporting

confidence: 72%

A natural ¹⁵N approach to determine the biological fixation of atmospheric nitrogen by biological soil crusts of the Negev Desert

Russow

Veste

Böhme

2005

Rapid Comm Mass Spectrometry

View full text Add to dashboard Cite

show abstract

“…Nevertheless, Pavlova and Maslov (2008) demonstrated the inability of nitrate uptake for the lichenized Trebouxia photobiont of Parmelia sulcata Taylor. Moreover, d 15 N values of nitrate in rain in central Europe ranged between +2.4 and À6.5& (Freyer 1991) and thus did not reach such negative values as measured in T. decolorans in this study (À15.8 ± 2.7&). Ammonia dissolved in rain (ammonium) is known to be more depleted in 15 N, ranging from À5.6 to À8.6& measured in the United Kingdom (Heaton et al 1997).…”

Section: Isotopic Discrimination Between Lichen Symbiontscontrasting

confidence: 68%

Nitrogen and carbon isotope variability in the green‐algal lichen Xanthoria parietina and their implications on mycobiont–photobiont interactions

Beck

Mayr

2012

Ecology and Evolution

View full text Add to dashboard Cite

Stable isotope patterns in lichens are known to vary largely, but effects of substrate on carbon and nitrogen stable isotope signatures of lichens were previously not investigated systematically. N and C contents and stable isotope (δ15N, δ13C) patterns have been measured in 92 lichen specimens of Xanthoria parietina from southern Bavaria growing on different substrates (bark and stone). Photobiont and mycobiont were isolated from selected populations and isotopically analyzed. Molecular investigations of the internal transcribed spacer of the nuclear ribosomal DNA (ITS nrDNA) region have been conducted on a subset of the specimens of X. parietina. Phylogenetic analysis showed no correlation between the symbionts X. parietina and Trebouxia decolorans and the substrate, isotope composition, or geographic origin. Instead specimens grown on organic substrate significantly differ in isotope values from those on minerogenic substrate. This study documents that the lichens growing on bark use additional or different N sources than the lichens growing on stone. δ15N variation of X. parietina apparently is controlled predominantly by the mass fraction of the mycobiont and its nitrogen isotope composition. In contrast with mycobionts, photobionts of X. parietina are much more 15N-depleted and show less isotopic variability than mycobionts, probably indicating a mycobiont-independent nitrogen acquisition by uptake of atmospheric ammonia.

show abstract

“…Much work is still required to thoroughly understand tree‐ring nitrogen series, as nitrogen loads in trees represent an integration of several inputs with different δ 15 N values, and of various processes affecting the properties of nitrogen available to trees, namely, foliar uptake of atmospheric species,43, 44 bacterial modification of nitrogen in soils, seasonal soil N variations,45 often poorly characterized N‐cycling processes,46 and within‐tree physiological mechanisms 30. We expect that in future, research studies using tree‐ring δ 15 N values will become common and will contribute to inferring past modification of the nitrogen cycle.…”

Section: Resultsmentioning

confidence: 99%

Is wood pre‐treatment essential for tree‐ring nitrogen concentration and isotope analysis?

Doucet

Savard

Bégin

et al. 2011

Rapid Comm Mass Spectrometry

View full text Add to dashboard Cite

Tree-ring nitrogen concentrations and isotope ratios (δ(15)N) are gaining in popularity for environmental research although their use is still debated because of nitrogen mobility in tree stems. Modern studies generally present results on wood that is pre-treated to remove soluble nitrogen compounds and to minimize the impact of radial translocation on tree-ring nitrogen environmental records. However, the necessity to use such pre-treatment has never been fully assessed. Here we compare the nitrogen concentrations and δ(15)N values of two wood preparation protocols applied to beech and red spruce tree rings for the removal of soluble compounds from ring pairs with non pre-treated tree rings. For both tree species, pre-treatment did not minimize the radial patterns of tree-ring nitrogen concentrations and the increasing concentration trends that are coincident with the heartwood-sapwood boundary. Therefore, even if the tree-ring nitrogen concentrations are slightly modified by pre-treatment, these concentrations are considered to reflect internal stem processes rather than environmental conditions in both species. The δ(15)N values were similar for untreated and pre-treated ring pairs, suggesting that wood pre-treatment did not substantially change the δ(15)N values and temporal trends in ring series. In addition, tree-ring δ(15)N series of untreated and pre-treated wood did not show any sign of influence of the heartwood-sapwood boundary in either tree species, indicating that nitrogen translocation did not generate significant isotopic fractionation. We therefore suggest that untreated ring δ(15)N values of beech and red spruce trees can be used for environmental research.

show abstract

Seasonal variation of 15N/14N ratios in atmospheric nitrate species

Cited by 132 publications

References 0 publications

A natural ¹⁵N approach to determine the biological fixation of atmospheric nitrogen by biological soil crusts of the Negev Desert

A natural ¹⁵N approach to determine the biological fixation of atmospheric nitrogen by biological soil crusts of the Negev Desert

Nitrogen and carbon isotope variability in the green‐algal lichen Xanthoria parietina and their implications on mycobiont–photobiont interactions

Is wood pre‐treatment essential for tree‐ring nitrogen concentration and isotope analysis?

Contact Info

Product

Resources

About

Seasonal variation of 15N/14N ratios in atmospheric nitrate species

Cited by 132 publications

References 0 publications

A natural 15N approach to determine the biological fixation of atmospheric nitrogen by biological soil crusts of the Negev Desert

A natural 15N approach to determine the biological fixation of atmospheric nitrogen by biological soil crusts of the Negev Desert

Nitrogen and carbon isotope variability in the green‐algal lichen Xanthoria parietina and their implications on mycobiont–photobiont interactions

Is wood pre‐treatment essential for tree‐ring nitrogen concentration and isotope analysis?

Contact Info

Product

Resources

About

A natural ¹⁵N approach to determine the biological fixation of atmospheric nitrogen by biological soil crusts of the Negev Desert

A natural ¹⁵N approach to determine the biological fixation of atmospheric nitrogen by biological soil crusts of the Negev Desert