Ammonium first: natural mosses prefer atmospheric ammonium but vary utilization of dissolved organic nitrogen depending on habitat and nitrogen deposition

Liu, Xueyan; Koba, Keisuke; Makabe, Akiko; Li, Xiaodong; Yoh, Muneoki; Liu, Cong‐Qiang

doi:10.1111/nph.12284

Cited by 69 publications

(63 citation statements)

References 84 publications

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“…Moreover, plant dissolved organic nitrogen (DON) use was often demonstrated experimentally by the uptake of one or a few 15 N‐labelled amino acids, which cannot elucidate the real availability of the whole soil DON pool to plants (Kahmen, Livesley, & Arndt, ), so that substantial uncertainties existed in the source contributions estimated by using the δ 15 N of the whole DON pool (e.g. Liu et al., ). Consequently, we assume NH 4 + and NO 3 − to be the dominant N sources for plants in tropical ecosystems (e.g.…”

Section: Methodsmentioning

confidence: 99%

“…Plant NH 4 + preference over NO 3 − (

β_{normalNH 4 +}

) was evaluated by using the

f_{normalNH 4 +}

minus corresponding proportional contributions of soil NH 4 + in soil DIN (Equation ).

{normalβ}_{NH 4 +} = f_{NH 4 +} - false([{NH}_{4}^{+}] false/ [DIN] false)

where

f_{normalNH 4 +}

values were calculated from Equation , [NH 4 + ] and [DIN] were mean concentrations of NH 4 + and DIN in soil of corresponding plots. Positive

β_{normalNH 4 +}

values indicate plant NH 4 + preference over soil NO 3 − , 0 values indicate no preference, and negative

β_{normalNH 4 +}

indicate a plant preference for NO 3 − over NH 4 + (more details in Liu et al., ).…”

Section: Methodsmentioning

confidence: 99%

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Plant nitrogen and phosphorus utilization under invasive pressure in a montane ecosystem of tropical China

Lei

Tan

et al. 2018

Journal of Ecology

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Exotic plant invasion has been changing the vegetation composition and function of terrestrial ecosystems. Nitrogen (N) and phosphorus (P) are often the limiting nutrients for terrestrial plants. However, under invasive pressure, in situ plant N and P usage mechanisms remain poorly understood but are pivotal for a better understanding of plant invasion and coexistence in invaded ecosystems. Nitrogen and P concentrations, natural 15N abundance (δ15N values) were investigated in leaves and soils under different invasive pressures (here expressed as the biomass percentages of invasive plants in each plot) for two invasive species (Chromolaena odorata and Ageratina adenophora) in Xishuangbanna in tropical China. Soil N and P concentrations revealed the relatively N‐rich but P‐poor status of our study site. Under invasion, soil inorganic N (dominated by ammonium) and available P did not increase significantly. The leaf N and P of invasive plants increased, while leaf N increased but P decreased for native species. Natural δ15N mass balance between leaves and soil inorganic N sources revealed that ammonium dominated N utilization in both natives and invaders. Invasive plants showed ammonium utilization with increasing leaf N levels, while native plants under no invasion showed nitrate utilization with increasing leaf N levels. Synthesis. Increased soil ammonium availability contributed to preferential ammonium utilization by invasive plants and elevated ammonium utilization in natives, but the P competition of natives decreased in invaded ecosystems. These novel insights into nutrient dynamics in invaded ecosystems enhance our understanding of plant invasion and coexistence mechanisms.

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Section: Methodsmentioning

confidence: 99%

“…Plant NH 4 + preference over NO 3 − (

β_{normalNH 4 +}

) was evaluated by using the

f_{normalNH 4 +}

minus corresponding proportional contributions of soil NH 4 + in soil DIN (Equation ).

{normalβ}_{NH 4 +} = f_{NH 4 +} - false([{NH}_{4}^{+}] false/ [DIN] false)

where

f_{normalNH 4 +}

values were calculated from Equation , [NH 4 + ] and [DIN] were mean concentrations of NH 4 + and DIN in soil of corresponding plots. Positive

β_{normalNH 4 +}

values indicate plant NH 4 + preference over soil NO 3 − , 0 values indicate no preference, and negative

β_{normalNH 4 +}

indicate a plant preference for NO 3 − over NH 4 + (more details in Liu et al., ).…”

Section: Methodsmentioning

confidence: 99%

Plant nitrogen and phosphorus utilization under invasive pressure in a montane ecosystem of tropical China

Lei

Tan

et al. 2018

Journal of Ecology

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“…Scenarios 3–4 are expected to be true for mosses because atmospheric NO − 3 has been assumed as the sole source (Liu et al, 2012a). Nevertheless, isotopic partitioning of N sources (Liu et al, 2013b) and further Δ 17 O analysis (Figure 5) suggests that moss NO − 3 , even at epilithic habitats, is actually a mixture of atmospheric NO − 3 and soil-derived NO − 3 . Thus, it is becoming clear that mosses can acquire substantial N from substrates; and moss NO − 3 is a valid atmospheric bio-monitor only for species growing on rare N-free substrates.…”

Section: Isotopic Systematics Of No−3 In Plantsmentioning

confidence: 96%

Nitrate dynamics in natural plants: insights based on the concentration and natural isotope abundances of tissue nitrate

et al. 2014

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The dynamics of nitrate (NO−3), a major nitrogen (N) source for natural plants, has been studied mostly through experimental N addition, enzymatic assay, isotope labeling, and genetic expression. However, artificial N supply may not reasonably reflect the N strategies in natural plants because NO−3 uptake and reduction may vary with external N availability. Due to abrupt application and short operation time, field N addition, and isotopic labeling hinder the elucidation of in situ NO−3-use mechanisms. The concentration and natural isotopes of tissue NO−3 can offer insights into the plant NO−3 sources and dynamics in a natural context. Furthermore, they facilitate the exploration of plant NO−3 utilization and its interaction with N pollution and ecosystem N cycles without disturbing the N pools. The present study was conducted to review the application of the denitrifier method for concentration and isotope analyses of NO−3 in plants. Moreover, this study highlights the utility and advantages of these parameters in interpreting NO−3 sources and dynamics in natural plants. We summarize the major sources and reduction processes of NO−3 in plants, and discuss the implications of NO−3 concentration in plant tissues based on existing data. Particular emphasis was laid on the regulation of soil NO−3 and plant ecophysiological functions in interspecific and intra-plant NO−3 variations. We introduce N and O isotope systematics of NO−3 in plants and discuss the principles and feasibilities of using isotopic enrichment and fractionation factors; the correlation between concentration and isotopes (N and O isotopes: δ18O and Δ17O); and isotope mass-balance calculations to constrain sources and reduction of NO−3 in possible scenarios for natural plants are deliberated. Finally, we offer a preliminary framework of intraplant δ18O-NO−3 variation, and summarize the uncertainties in using tissue NO−3 parameters to interpret plant NO−3 utilization.

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“…Pore water that has passed through the Sphagnum filter may differ in terms of 103 water quality including pH (Manninen et al, 2011;Sheppard et al, 2014) (Krupa, 2003;Staelens et al, 2008;Stevens et al, 2011) and hydrogen 108 ion (H + ) leaching (Krupa, 2003;Liu et al, 2013;Manninen et al, 2011;Paulissen et al, 109 2004; Stevens et al, 2011;Tomassen et al, 2003). In contrast, NO3 -uptake is 110 accompanied by hydroxyl ion (OH -) loss generated by nitrate reduction (Manninen et al,111 2011; Stevens et al, 2011).…”

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confidence: 99%

Sphagnum can ‘filter’ N deposition, but effects on the plant and pore water depend on the N form

Chiwa

Sheppard

Leith

et al. 2016

Science of The Total Environment

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Ammonium first: natural mosses prefer atmospheric ammonium but vary utilization of dissolved organic nitrogen depending on habitat and nitrogen deposition

Cited by 69 publications

References 84 publications

Plant nitrogen and phosphorus utilization under invasive pressure in a montane ecosystem of tropical China

Plant nitrogen and phosphorus utilization under invasive pressure in a montane ecosystem of tropical China

Nitrate dynamics in natural plants: insights based on the concentration and natural isotope abundances of tissue nitrate

Sphagnum can ‘filter’ N deposition, but effects on the plant and pore water depend on the N form

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