Relationship between the natural abundance of soil nitrogen isotopes and condition in North Dakota wetlands

Meyers, Lindsey M.; Nahlik, Amanda M.; DeKeyser, Edward S.

doi:10.1016/j.ecolind.2015.06.042

Cited by 4 publications

(4 citation statements)

References 31 publications

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“…Isotopes are chemical elements that have the same atomic number but different atomic mass. The chemical identity of an atom is determined by its atomic number [16,17]. Nitrogen has two stable isotopes, Nitrogen-14 and 15.…”

Section: Nitrogen Isotopes As Environmental Tracersmentioning

confidence: 99%

Applying Isotope Techniques and Modeling to Identify the Nitrogen Source in Göksu Delta

Gülçiçek

Demirel

2019

Pol. J. Environ. Stud.

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Wetlands that cover 6% of the world's land surface contain about 12% of the global carbon pool, and therefore the contribution of wetlands to the global carbon cycle is great [1, 2]. Wetlands have countless benefits as they provide humankind, nutrition and building materials, biodiversity, flood control, groundwater recharge, and climate change mitigation. Governments and other institutions have tried to conserve and protect wetlands for more than 40 years, since the Ramsar Convention. Many wetlands have close associations with groundwater. For example, a wetland could feed the aquifer or could be fed from the aquifer. In such cases, the water budget of the aquifer and the health of the wetland ecosystem are connected. So, water resources and wetlands must be managed in an integrated manner in order to ensure the sustainability of the ecosystem [3].

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Section: Nitrogen Isotopes As Environmental Tracersmentioning

confidence: 99%

Applying Isotope Techniques and Modeling to Identify the Nitrogen Source in Göksu Delta

Gülçiçek

Demirel

2019

Pol. J. Environ. Stud.

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“…The N cycle in terrestrial plant-soil system is complex, with recycling of N between plant and soil through litterfall, decomposition and microbial production of biologically available N (NH4 + , NO3 -, and amino acids) which is taken up by the plant again, as well as N input as N2-fixation and atmospheric deposition, and output as leaching and gas emission (Ågren and Andersson 2012). To understand the N cycle processes which are difficult to measure directly, the ratio of two stable isotopes of nitrogen ( 15 N: 14 N) in plant and soil (δ 15 N) have been proposed as an useful indicator (Meyers et al 2016;Robinson 2001). Each process of the N cycle described above offers an opportunity for isotopic fractionation, which results in reaction products that are depleted in 15 N relative to substrates.…”

Section: Introductionmentioning

confidence: 99%

Influence of soil N availability on the difference between tree foliage and soil δ15N from comparison of Mongolia and northern Japan

Fujiyoshi

Sugimoto

Yamashita

et al. 2019

Ecological Indicators

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Nitrogen isotope ratios (δ 15 N) in plants and soil are widely known as indicators of the N cycle in terrestrial ecosystem. Recent studies have proposed that the difference between plant and soil δ 15 N (Δδ 15 N) is a better indicator of the N cycle than plant δ 15 N or soil δ 15 N alone. However, the processes of the N cycle indicated by Δδ 15 N are not well understood. The present study compared Δδ 15 N variations between different ecosystems of northern Mongolia and northern Japan (Hokkaido) to associate the Δδ 15 N characteristics with soil N availability. Needles of Siberian larch (Larix sibirica Ledeb.) in Mongolia, Todo-fir (Abies sachalinensis (F.Schmidt) Mast.) in Hokkaido, and mineral soils from both regions were acquired for determination of Δδ 15 N values. Δδ 15 N showed similar large variations (8‰) in the two regions with no significant correlations to climate factors. On the other hand, the relationship between Δδ 15 N and soil δ 15 N was opposite between the two regions with a positive correlation in Mongolia (rs = 0.504) and a negative correlation in Hokkaido(rs = -0.600). Moreover, total inorganic N (total amount of NH4 + and NO3 -) contents were up to 20 times higher in Hokkaido than in Mongolia. Δδ 15 N showed significant correlation with the fraction of NO3relative to total inorganic N in the 0-10 cm soil layer in Hokkaido. These results indicate that Δδ 15 N variation in Hokkaido can be explained by progression of nitrification in soil, which is different in Mongolia where Δδ 15 N variation is explained by microbial N immobilization. Our findings suggest that soil N availability affects Δδ 15 N indicator owing to changes in the N cycle process, which are reflected in the relationships of foliage δ 15 N or soil δ 15 N with Δδ 15 N.

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“…Consequently, the plant's δ 15 N composition can be used as a marker to evaluate direction and rate of ecological processes related to isotope fractionation (Tiunov, 2007). Many studies concluded the shift of δ 15 N values to be related to temperature, precipitation, carbon dioxide in the air, as well as other factors (Martinelli et al, 1999;Aranibar et al, 2008;Liu and Wang, 2010;Meyers et al, 2016). However, the issue of how the environmental factors affect the plants δ 15 N is still unclear at present (West, 2006;Valery et al, 2008;Zhou et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

“…A better understanding of the correlations between nitrogen isotopic fractionations and plant biochemical processes is essential to use δ 15 N as environmental integrator of nitrogen cycle processes (Meyers et al, 2016).…”

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confidence: 99%

Stable Nitrogen Isotopic Changes in Winter Wheat (<i>Triticum aestivum</i> L.) Induced by its Growth Temperature

Wang¹,

Liu²,

Hao³

2017

American Journal of Agricultural and Biological Sciences

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The nitrogen dynamics of plants can be quantified using the variation in their δ 15 N level. This reveals details of plant physiological characteristics and the relationship between plants and their growth conditions. To better understand plant nitrogen dynamics and the effects of external temperature changes on their nitrogen isotopic composition, we investigated the δ 15 N characteristics in Triticum aestivum and its mother soils during the plant's life cycle. We found that under field conditions, the plant's leaves and roots δ 15 N significantly changed. The δ 15 N values in Triticum aestivum changed from -1.6‰ to -8.1‰ for leaves and from -2.0‰ to -8.8‰ for roots, respectively. δ15 N values for both, the leaves and roots were positively correlated with temperature. However, the foliar δ 15 N corresponded more strongly to air temperature, while the root δ 15 N corresponded to soil temperature. δ 15 N values of leaf and root both changed around 0.2‰ in response to a 1 degree change in temperature. Plant roots or shoot material cannot reflect the whole plant δ 15 N values due to a considerable difference between the δ 15 N values of root and leaf. However, the variations in leaf and root δ 15 N provide useful proxies to trace seasonal plant nitrogen cycles.

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Relationship between the natural abundance of soil nitrogen isotopes and condition in North Dakota wetlands

Cited by 4 publications

References 31 publications

Applying Isotope Techniques and Modeling to Identify the Nitrogen Source in Göksu Delta

Applying Isotope Techniques and Modeling to Identify the Nitrogen Source in Göksu Delta

Influence of soil N availability on the difference between tree foliage and soil δ15N from comparison of Mongolia and northern Japan

Stable Nitrogen Isotopic Changes in Winter Wheat (<i>Triticum aestivum</i> L.) Induced by its Growth Temperature

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