Natural 15 N Abundance of Plants and Soil N in a Temperate Coniferous Forest

Koba, Keisuke; Hirobe, Muneto; Koyama, Lina; Kohzu, Ayato; Tokuchi, Naoko; Nadelhoffer, Knute J.; Wada, Eitaro; Takeda, Hiroshi

doi:10.1007/s10021-002-0132-6

Cited by 78 publications

(54 citation statements)

References 56 publications

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“…Plant leaf NRA is a good indicator of soil nitrate availability in systems where NO 3 -is the dominant form of N available to plants (Högberg et al 1986;Koba et al 2003), as is often the case in post-fire ecosystems (DeLuca and Sala 2006; Koyama et al 2010;Smithwick et al 2005). Our data suggest that wood strand mulch results in elevated soil NO 3 -compared to the control after 4 years.…”

Section: Site Treatment Ph Organic Matter Carbon Nitrogen -----------supporting

confidence: 59%

Post-fire erosion control mulches alter belowground processes and nitrate reductase activity of a perennial forb, heartleaf arnica (Arnica cordifolia)

Berryman¹,

Morgan²,

Robichaud³

et al. 2014

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Section: Site Treatment Ph Organic Matter Carbon Nitrogen -----------supporting

confidence: 59%

Post-fire erosion control mulches alter belowground processes and nitrate reductase activity of a perennial forb, heartleaf arnica (Arnica cordifolia)

Berryman¹,

Morgan²,

Robichaud³

et al. 2014

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“…15 N values of leaves and roots were lower than soil δ 15 N, which is testified in other studies (Evans and Ehleringer, 1993;Garten, 1993;Högberg and Johannisson, 1993;Michelsen et al, 1998;Miller and Bowman, 2002;Koba et al, 2003).…”

supporting

confidence: 70%

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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“…It should be emphasized that the contrasting effects of deposited NO 3 − and NH 4 + were only found at the low level of N addition. A positive correlation between soil CO 2 flux and soil NO 3 − -N content is generally observed at large spatial scales (Koba et al 2003;Inselsbacher et al 2010). Based on a 15 N tracer experiment in the subtropical forests of southern China, Sheng et al (2014) also reported that more 15 NH 4 + was recovered from organic and mineral soils, while a large proportion of 15 NO 3 − was recovered from plant roots.…”

Section: Effects Of N Levels and Forms On Soil Co 2 Fluxmentioning

confidence: 99%

Contrasting effects of ammonium and nitrate inputs on soil CO2 emission in a subtropical coniferous plantation of southern China

et al. 2015

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Increased nitrogen (N) deposition has been found controversial affecting soil CO 2 emission in terrestrial ecosystems, which leads to serious debate on the efficiency of estimated C sequestration induced by N enrichment. The forms of input N might be responsible for this controversy. This study aims to explore the effects of NH 4 + (reduced N) and NO 3 − (oxidized N) on soil CO 2 flux and the underlying microbial mechanisms. An N addition experiment, two N fertilizers (NH 4 Cl and NaNO 3 ) and two rates (40 and 120 kg N ha −1 year −1 ), was carried out in a slash pine plantation of southern China. Soil-atmospheric CO 2 exchange, soil microbial biomass, and community composition were measured using static chamber-gas chromatography and phospholipid fatty acid (PLFA) analyses in the active growing and nonactive growing seasons, respectively. Low level of NaNO 3 addition significantly increased soil CO 2 flux in the active growing season, whereas other N treatments did not change soil CO 2 flux. High level of NH 4 Cl addition significantly reduced soil fungal biomass (fungal PLFA) and changed microbial community composition (ratio of fungal to bacterial (F/B) PLFAs). The positive relationships between the change in soil CO 2 flux and the change in fungal biomass, as well as between the change in soil CO 2 flux and the change in community composition, were observed in the nonactive growing season. The N forms as NO 3 − or NH 4 + are important factors affecting C cycles in the subtropical coniferous plantation. These results suggested that the variations of soil CO 2 emission and microbial biomass and community composition in the subtropical plantation depended on the seasons and the levels and forms of N addition.

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Natural 15 N Abundance of Plants and Soil N in a Temperate Coniferous Forest

Cited by 78 publications

References 56 publications

Post-fire erosion control mulches alter belowground processes and nitrate reductase activity of a perennial forb, heartleaf arnica (Arnica cordifolia)

Post-fire erosion control mulches alter belowground processes and nitrate reductase activity of a perennial forb, heartleaf arnica (Arnica cordifolia)

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

Contrasting effects of ammonium and nitrate inputs on soil CO2 emission in a subtropical coniferous plantation of southern China

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