Black spruce assimilates nitrate in boreal winter

Koyama, Lina; Kielland, Knut

doi:10.1093/treephys/tpy109

Cited by 6 publications

(4 citation statements)

References 46 publications

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“…The preference of conifers for different inorganic N forms has been previously discussed in different works [21,22,29]. Depending on the species habitat, including climatic and soil conditions, conifers show preferences for the uptake and utilization of ammonium or nitrate [22].…”

Section: Discussionmentioning

confidence: 99%

Inorganic Nitrogen Form Determines Nutrient Allocation and Metabolic Responses in Maritime Pine Seedlings

Ortigosa

Valderrama‐Martín

Urbano-Gámez

et al. 2020

Plants

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Nitrate and ammonium are the main forms of inorganic nitrogen available to plants. The present study aimed to investigate the metabolic changes caused by ammonium and nitrate nutrition in maritime pine (Pinus pinaster Ait.). Seedlings were grown with five solutions containing different proportions of nitrate and ammonium. Their nitrogen status was characterized through analyses of their biomass, different biochemical and molecular markers as well as a metabolite profile using 1 H-NMR. Ammonium-fed seedlings exhibited higher biomass than nitrate-fed-seedlings. Nitrate mainly accumulated in the stem and ammonium in the roots. Needles of ammonium-fed seedlings had higher nitrogen and amino acid contents but lower levels of enzyme activities related to nitrogen metabolism. Higher amounts of soluble sugars and L-arginine were found in the roots of ammonium-fed seedlings. In contrast, L-asparagine accumulated in the roots of nitrate-fed seedlings. The differences in the allocation of nitrate and ammonium may function as metabolic buffers to prevent interference with the metabolism of photosynthetic organs. The metabolite profiles observed in the roots suggest problems with carbon and nitrogen assimilation in nitrate-supplied seedlings. Taken together, this new knowledge contributes not only to a better understanding of nitrogen metabolism but also to improving aspects of applied mineral nutrition for conifers.

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Section: Discussionmentioning

confidence: 99%

Inorganic Nitrogen Form Determines Nutrient Allocation and Metabolic Responses in Maritime Pine Seedlings

Ortigosa

Valderrama‐Martín

Urbano-Gámez

et al. 2020

Plants

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“…However, such effects are diverse and depend on ecosystem types, which is associated not only with climatic conditions but also with vegetation, litter quality and quantity, microbial composition, and plant N demand (Li et al 2016). Although nitrogen production and uptake by plants during winter are relatively well studied in temperate forests (Andresen and Michelsen 2005;Ueda and Tokuchi 2013), the number of studies in boreal and tundra ecosystems is still limited (Cooper 2014;Koyama and Kielland 2019). Kielland et al (2006) described how earlier and deeper snow packs in forest ecosystems allow microbial activity to continue during winter in Alaska, which was previously presumed to be biologically inactive due to a negative soil temperature.…”

Section: Introductionmentioning

confidence: 99%

Effects of snow manipulation on larch trees in the taiga forest ecosystem in northeastern Siberia

Shakhmatov

Hashiguchi

Maximov

et al. 2022

Prog Earth Planet Sci

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Changes in winter precipitation (snow) may greatly affect vegetation by altering hydrological and biochemical processes. To understand the effects of changing snow cover depth and melt timing on the taiga forest ecosystem, a snow manipulation experiment was conducted in December 2015 at the Spasskaya Pad experimental larch forest in Eastern Siberia, which is characterized by a continental dry climate with extreme cold winters and hot summers. Variables including soil temperature and moisture, oxygen and hydrogen isotope ratios of soil moisture and stem water, foliar nitrogen and carbon contents and their isotopes, phenology, and soil inorganic nitrogen were observed at snow removal (SNOW−), snow addition (SNOW+), and CONTROL plots. After snow manipulation, the soil temperature at the SNOW− plot decreased significantly compared to the CONTROL and SNOW+ plots. At SNOW− plot, snowmelt was earlier and soil temperature was higher than at other plots during spring because of low soil moisture caused by less snowmelt water. Despite the earlier snowmelt and higher soil temperature in the SNOW− plot in the early growing season, needle elongation was delayed. Leaf chemistry also differed between the CONTROL and SNOW− plots. The needle nitrogen content in the SNOW− plot was lower in the middle of July, whereas no difference was observed among the three plots in August. The soil inorganic nitrogen content of each plot corresponded to these results. The amount of soil ammonium was lower in the SNOW− plot than in the other plots at the end of July, however, once production started in August, the amount of soil ammonium in the three plots was comparable. Extremely low soil temperatures in winter and freeze–thaw cycles in spring and dry soil condition in spring and early summer at the SNOW− plot may have influenced the phenology and production of soil inorganic nitrogen.

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“…However, recent studies on the capacity of plants to use nitrate suggest it can be important in certain northern ecosystems such as in riparian forests and non-acidic arctic tundra (Liu et al 2018;Koyama and Kielland 2019).…”

Section: /24 Introductionmentioning

confidence: 99%

Seasonal changes in nitrate assimilation of boreal woody species: importance of the leaf-expansion period

Koyama

Kielland

2022

Trees

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Black spruce assimilates nitrate in boreal winter

Cited by 6 publications

References 46 publications

Inorganic Nitrogen Form Determines Nutrient Allocation and Metabolic Responses in Maritime Pine Seedlings

Inorganic Nitrogen Form Determines Nutrient Allocation and Metabolic Responses in Maritime Pine Seedlings

Effects of snow manipulation on larch trees in the taiga forest ecosystem in northeastern Siberia

Seasonal changes in nitrate assimilation of boreal woody species: importance of the leaf-expansion period

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