Indices of dissolved organic nitrogen, ammonium and nitrate across productivity gradients of boreal forests

Kranabetter, J. M.; Dawson, C.R.; Dunn, D. E.

doi:10.1016/j.soilbio.2007.06.026

Cited by 69 publications

(48 citation statements)

References 46 publications

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“…Similarly, DON accumulation might also be explained by a winter decrease of DON uptake by plants. However, we have no evidence that plants growing in these pine forests are able to uptake DON, as has been found in other less productive ecosystems suffering from N limitation (Kranabetter et al, 2007).…”

Section: Discussioncontrasting

confidence: 62%

“…Furthermore, combustion and erosion affect the organic superficial horizons more, with higher organic-to-inorganic N ratios (DeBano and Conrad, 1978). It is also possible that microorganisms of burned plots are using DON as a C and N source to a greater extent than in unburned plots, where a wider variety of C and N sources are present (Kranabetter et al, 2007).…”

Section: Discussionmentioning

confidence: 99%

“…For this reason, few studies have considered the effects of fire on labile organic N forms as a key to understanding the overall impact of fires on forest systems. However, organic N uptake by plants is currently gaining in importance, especially in N-poor systems where plants and microorganisms could compete for mainly organic N forms (Kranabetter et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Discussioncontrasting

confidence: 62%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2010

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“…In subarctic forests, the concentration of SON (averaged over 22 samples) measured by the K 2 SO 4 extraction is 22 mg kg −1 and this represents 67% of total soluble N (Jones and Kielland 2002; see Table 1). In temperate forest ecosystems, concentrations of soil SON extracted by various methods from surface soils generally range from 7 to 29 mg N kg −1 , with average values of 17 mg N kg −1 by the KCl extraction (n=10) and 14 mg N kg −1 by K 2 SO 4 extraction (n=21; see Table 1; Hannam and Prescott 2003;Zhu and Carreiro 2004;Zhong and Makeschin 2003;Berthrong and Finzi 2006;Ghani et al 2007;Giai and Boerner 2007;Kranabetter et al 2007). These values represent an average of 70% of total soluble N. In subtropical forest ecosystems Picea abies (L.) Karst.)…”

Section: The Size Of Son Pools In Forest Ecosystemsmentioning

confidence: 99%

Analysis and behavior of soluble organic nitrogen in forest soils

Chen

2008

J Soils Sediments

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Background, aim, and scope A large proportion of soil nitrogen (N; >80%) is present in organic form. Current research on plant N uptake in terrestrial ecosystems has focused mainly on inorganic N such as ammonium (NH 4 + ) and nitrate (NO 3 − ), while soluble organic N (SON) has received little attention. In recent years, the increasing evidence showing the direct uptake of various amino acids by plants and the predominance of the organic form in N loss by leaching in many forest ecosystems has drawn attention to critically re-examine the nature and the ecological role of soil SON in terrestrial N cycling. However, little is known about the sources and dynamics, chemical nature, and ecological functions of soil SON in forest ecosystems. This paper reviews recent advances in the areas of research on current techniques for characterizing soil SON and the size, nature, and dynamics of soil SON pools in forest ecosystems. Materials and methods The SON represents a significant pool of available and mobile N in forest soils. The SON can be sampled using a number of physical (e.g., suction cup, microdialysis) and chemical (e.g., extraction) methods and analyzed by the wet chemistry method (e.g., persulfate oxidation) and combustion. Chemical and physical fractionation, pyrolysis-mass spectrometry, 13 C and 15 N nuclear magnetic resonance spectroscopy, and 15 N, 13 C, and 14 C isotopic techniques have been used for investigating the nature and dynamics of SON in forest ecosystems. Results and discussion The amount of SON in soil may vary with land use type, forest species, management practices, and analytical procedures used. Statistical figures, based on 116 datasets available in the literature, have shown that concentrations of soil SON can range from 1 mg N kg −1 (dry weight basis) to up to 448 mg N kg −1 , with an average of 35 mg N kg −1 , representing an average of 48% of total soluble N. Soil SON consists of a mixture of structurally diverse N-containing compounds, possibly with the amide N, amino acids, and amino sugars being predominant. The biodegradability of SON largely depends upon its chemical characteristics (e.g., C-to-N ratio). Conclusions Direct utilization of added amino acids by a large number of forest species may present a potentially important new pathway for plant N uptake. However, the evidence of direct utilization of soil native SON by forest plants is still lacking, and the extent of the contribution of SON to forest plants is far from certain. Transformation of soil organic matter into SON, rather than the conversion of SON to NH 4 + /NO 3 − , may be the rate-limiting step, which regulates the overall N cycling in N-limited forest ecosystems.Recommendations and perspectives Future work may well focus on the chemical and biological nature of SON in forest soils, microbial transformation of SON, the nutritional role of the SON pools in the N-limited forest ecosystems, and the potential role of SON in global climate change (e.g., N 2 O emission).

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“…In addition, the N form preferences of conifers may be affected by N uptake in associated ECM fungi [110], which may lead to the allocation of N from organic decomposition and from arthropods predated by ECM fungi, such as Laccaria bicolor [111]. These associations are strong because each population of conifer species has specific affiliations with local ECM fungi, and the growth of trees in new environments or locations may be seriously affected by the lack of a precise ECM fungal variant [112]. As a classical view, it has been proposed that N is transferred from fungi to plants as amino acids, mainly arginine, although it is now suggested that mycorrhizal fungi directly transfer ammonia and peptides into plant roots [108,113].…”

Section: Biotic Interactionsmentioning

confidence: 99%

Nitrogen Economy and Nitrogen Environmental Interactions in Conifers

et al. 2016

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Efficient acquisition, assimilation and economy of nitrogen are of special importance in trees that must cope with seasonal periods of growth and dormancy over many years. The ability to accumulate nitrogen reserves and to recycle N determine to a great extent the growth and production of forest biomass. The metabolic relevance of two key amino acids, arginine and phenylalanine, as well as other processes potentially involved in the nitrogen economy of conifers are discussed in the current review. During their long life cycles, conifers not only cope with cyclical annual and long-term changes in the environment but also interact with other organisms such as herbivores and symbionts. The interactions of biotic and abiotic factors with conifer nitrogen metabolism will also be outlined in this review.

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Indices of dissolved organic nitrogen, ammonium and nitrate across productivity gradients of boreal forests

Cited by 69 publications

References 46 publications

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

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

Analysis and behavior of soluble organic nitrogen in forest soils

Nitrogen Economy and Nitrogen Environmental Interactions in Conifers

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