Soil amino acid turnover dominates the nitrogen flux in permafrost-dominated taiga forest soils

Jones, Davey L.; Kielland, Knut

doi:10.1016/s0038-0717(01)00175-4

Cited by 259 publications

(181 citation statements)

References 37 publications

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“…This new ( 15 N-14 C) approach to quantify the significance of organic N uptake by plants offers greater sensitivity than commonly applied 15 N-13 C techniques, since the detection of 14 C as opposed to 13 C is not hindered by the large background of 12 C (Nä sholm and Persson 2001). Moreover, the slow-release kinetics of soluble organic N from macromolecular N (algae, isolated protein) enable the assessment of organic N nutrition over extended periods as opposed to the inherent problems when injecting double-labelled amino acids that turnover within minutes to hours (Jones 1999;Jones and Kielland 2002). Two points should be considered that potentially interfere with the technique.…”

Section: Discussionmentioning

confidence: 99%

“…In this regard, however, there still exists an obvious shortcoming that the amino acids were injected into the soil only once and in the form of aqueous solutions of one amino acid (Nä sholm et al 2000;Nordin et al 2001;Taylor et al 2004;Weigelt et al 2005) or a mixture of several amino acids (Chapin et al 1993;Persson and Nä sholm 2003) while in soils free amino acids are continuously produced by microbial decomposition as a mixture of amino acids and therefore continuously contribute to plant organic N acquisition. Single injections of amino acids into soils in short-term studies are problematic because of fast decomposition and immobilization of free amino acids in soils (Schmidt et al 1960;Kassim et al 1981;Jones 1999;Jones and Kielland 2002).…”

Section: Introductionmentioning

confidence: 99%

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Significance of organic nitrogen acquisition for dominant plant species in an alpine meadow on the Tibet plateau, China

Ouyang

Kuzyakov

et al. 2006

Plant Soil

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Though the potential of plants to take up organic N (e.g., amino acids) is well established, the true significance of organic N acquisition to plant N nutrition has not yet been quantified under field conditions. Here we demonstrate that organic N contributes significantly to the annual N uptake of three dominant plant species (Kobresia humilis, Saussurea superba and Stipa aliena) of alpine meadows on the Tibet Plateau, China. This was achieved by using double-labelled ( 14 C and 15 N) algae as a source for slow and continuous release of amino acids, and tracing both labels in the above-and belowground plant biomass. Four months after addition of algae, between 0.5% and 2.6% of 14 C and 5% and 14% of 15 N from added algae were recovered in the plants, which translate into an uptake of organic N between 0.3 mg N m )2 and 1.5 mg N m )2 . The calculated contribution of organic N to total N uptake was estimated to range between 21% and 35% for K. humilis, and between 13% and 21% for S. aliena and S. superba, respectively, implying that organic N uptake by grassland plants is quantitatively significant under field conditions in the studied alpine meadows. This finding has important ecological implications with regard to competition for organic N between microorganisms and plant roots.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Significance of organic nitrogen acquisition for dominant plant species in an alpine meadow on the Tibet plateau, China

Ouyang

Kuzyakov

et al. 2006

Plant Soil

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“…After a wildfire, both a decrease in quality and amount of soil C are likely. Under these conditions, DON may represent a preferential labile C source for soil microbes, decreasing its soil concentration on a long-term basis (Jones and Kielland, 2002). On shorter time scales, losses by volatilization and pyrolysis or plant uptake, may explain a decline in soil DON (Raison, 1979;Smithwick, 2005).…”

Section: Discussionmentioning

confidence: 99%

Long-term decrease of organic and inorganic nitrogen concentrations due to pine forest wildfire

et al. 2010

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Keywords: dissolved organic nitrogen / labile nitrogen / microbial biomass / mineral nitrogen / Pinus canariensis / fire Abstract • Growing concerns about fires and the increase of fire frequency and severity due to climate change have stimulated a large number of scientific papers about fire ecology. Most researchers have focused on the short-term effects of fire, and the knowledge about the long-term consequences of fires on ecosystem nutrient dynamics is still scarce.• Our aim was to improve the existing knowledge about the long-term effects of wildfires on forestlabile N concentrations. We hypothesized that fires may cause an initial decline in organic and inorganic N availability, and in the amount of microbial biomass-N; this should be followed by the recovery of pre-fire N concentrations on a long-term basis. We selected a fire chronosequence in Pinus canariensis forests on La Palma Island (Canary Islands, Spain). These forests are under low anthropogenic atmospheric deposition, and forest management is completely lacking; wildfires are therefore the only significant disturbance. Soil samples were collected during the winter and spring at 22 burned and unburned plots.• Fire produced a significant decrease in microbial biomass N, mineral N and dissolved organic N. Almost 20 y after fire, pre-fire levels of N concentrations had not recovered.• These results demonstrate that P. canariensis forest soils have a lower resilience against fire than expected. The magnitude of these observed changes suggests that pine forest wildfires may induce long-term (2 decades) changes in soil and in plant primary production. Mots-clés :azote organique dissous / azote labile / biomasse microbienne / azote minéral / Pinus canariensis / incendie Résumé -Décroissance à long terme des concentrations d'azote organique et inorganique, attribuable au feu dans une forêt de pins.• Les préoccupations grandissantes au sujet des incendies, de l'augmentation de leur fréquence et de leur gravité attribuable aux changements climatiques ont stimulé la production d'un grand nombre d'articles scientifiques sur l'écologie des incendies. La plupart des chercheurs ont mis l'accent sur les effets à court terme de l'incendie, et les connaissances sur les conséquences à long terme des incendies sur la dynamique des éléments nutritifs de l'écosystème sont encore rares.• Notre objectif est d'améliorer les connaissances actuelles sur les effets à long terme des incendies sur les concentrations labiles d'azote en forêt. Nous avons émis l'hypothèse que les incendies peuvent provoquer une baisse initiale de l'azote organique et de la disponibilité de l'azote inorganique, et de la quantité de biomasse microbienne azotée, ce qui devrait être suivie par la récupération des concentrations d'azote d'avant le feu sur une base de long terme. Nous avons sélectionné une chronoséquence d'incendies dans des forêts de Pinus canariensis sur l'île de La Palma (îles Canaries, Espagne). Ces forêts sont situées sous de faibles dépôts atmosphériques d'origine anthropique, ...

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“…It has been shown that the turnover of free amino acids in soil through microbial mineralization is very fast (within a few hours) (Jones and Kielland, 2002). The mineralization of the colloidal sized organic Se might be slower than the free amino acids.…”

Section: Mass Balance Estimationmentioning

confidence: 99%

“…It has been estimated that the total amount of Se taken up by plants in both pot experiment using the potato field soils and field experiment using the grassland soils is in similar range, i.e. 0.8 to 14 times and 1.3 to 11 times, respectively, of the shown that the turnover of free amino acids in soil is in the magnitude of hours (Jones and Kielland, 2002), whereas the turnover of up to 40% of DOM in soil solution is in the order of days to months (Kalbitz et al, 2000). Our study has…”

Section: Thementioning

confidence: 99%

Selenium speciation and bioavailability in Dutch agricultural soils: the role of soil organic matter

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Soil amino acid turnover dominates the nitrogen flux in permafrost-dominated taiga forest soils

Cited by 259 publications

References 37 publications

Significance of organic nitrogen acquisition for dominant plant species in an alpine meadow on the Tibet plateau, China

Significance of organic nitrogen acquisition for dominant plant species in an alpine meadow on the Tibet plateau, China

Long-term decrease of organic and inorganic nitrogen concentrations due to pine forest wildfire

Selenium speciation and bioavailability in Dutch agricultural soils: the role of soil organic matter

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