Dissolved Organic Nitrogen in Mediterranean Ecosystems

Delgado‐Baquerizo, Manuel; Covelo, Felisa; Gallardo, Antonio

doi:10.1016/s1002-0160(11)60131-8

Cited by 30 publications

(24 citation statements)

References 47 publications

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“…The ability of Iberian gypsovags to grow in and out of gypsum soils could be related to their capacity to regulate the uptake of excess nutrients in the soil (particularly S and Ca). Nevertheless, such “blocking” of soil nutrients may also have negative consequences on their ability to uptake other nutrients, such as N and P, which are inherently poor in gypsum soils [18], [19]. This suggestion agrees with the stress tolerant nature of Iberian gypsovags and their reported low nutrient concentrations [16].…”

Section: Discussionsupporting

confidence: 72%

Gypsophile Chemistry Unveiled: Fourier Transform Infrared (FTIR) Spectroscopy Provides New Insight into Plant Adaptations to Gypsum Soils

et al. 2014

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Gypsum soils are among the most restrictive and widespread substrates for plant life. Plants living on gypsum are classified as gypsophiles (exclusive to gypsum) and gypsovags (non-exclusive to gypsum). The former have been separated into wide and narrow gypsophiles, each with a putative different ecological strategy. Mechanisms displayed by gypsum plants to compete and survive on gypsum are still not fully understood. The aim of this study was to compare the main chemical groups in the leaves of plants with different specificity to gypsum soils and to explore the ability of Fourier transform infrared (FTIR) spectra analyzed with neural network (NN) modelling to discriminate groups of gypsum plants. Leaf samples of 14 species with different specificity to gypsum soils were analysed with FTIR spectroscopy coupled to neural network (NN) modelling. Spectral data were further related to the N, C, S, P, K, Na, Ca, Mg and ash concentrations of samples. The FTIR spectra of the three groups analyzed showed distinct features that enabled their discrimination through NN models. Wide gypsophiles stood out for the strong presence of inorganic compounds in their leaves, particularly gypsum and, in some species, also calcium oxalate crystals. The spectra of gypsovags had less inorganic chemical species, while those of narrow gypsum endemisms had low inorganics but shared with wide gypsophiles the presence of oxalate. Gypsum and calcium oxalate crystals seem to be widespread amongst gypsum specialist plants, possibly as a way to tolerate excess Ca and sulphate. However, other mechanisms such as the accumulation of sulphates in organic molecules are also compatible with plant specialization to gypsum. While gypsovags seem to be stress tolerant plants that tightly regulate the uptake of S and Ca, the ability of narrow gypsum endemisms to accumulate excess Ca as oxalate may indicate their incipient specialization to gypsum.

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Section: Discussionsupporting

confidence: 72%

Gypsophile Chemistry Unveiled: Fourier Transform Infrared (FTIR) Spectroscopy Provides New Insight into Plant Adaptations to Gypsum Soils

et al. 2014

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“…Sub-samples of each non-incubated (air-dried) extract were taken for measurements of amino acids and proteins according to Chantigny et al (Chantigny et al 2006). Ammonium, nitrate and DON were measured following Delgado-Baquerizo et al (2011). Total available N was calculated as the sum of ammonium, nitrate and DON.…”

Section: Soil Sampling and Analysesmentioning

confidence: 99%

Climatic conditions, soil fertility and atmospheric nitrogen deposition largely determine the structure and functioning of microbial communities in biocrust-dominated Mediterranean drylands

et al. 2015

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Background and aims Nitrogen (N) deposition and climate change are a threat to the structure and function of drylands, where biocrust-dominated communities are prevalent. We aimed at evaluating the influence of N deposition, climate and edaphic properties of semiarid areas of Spain on soil microbial communities and N cycling. Methods We quantified soil bacteria, fungi, ammonium oxidizing bacteria and archaea, estimated the abundance of autotrophic organisms (soil pigment content) and measured a wide array of variables related to the N cycle.

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“…Further studies showed that boreal forest vegetation actively take up amino acids, probably due to a lack of other N sources (Delgado-Baquerizo et al 2011;Nasholm et al 1998). The ratio of uptake of DIN versus DON was shown to be strongly dependent on their availability (Kranabetter et al 2007;Stahl et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Organic nitrogen uptake by plants: reevaluation by position-specific labeling of amino acids

et al. 2015

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Current studies suggest that many plants are able to take up not only inorganic nitrogen (N) but also organic N. We used the novel tool of positionspecific isotope labeling to improve the quantification of intact amino acid uptake and to deepen our understanding of the processes occurring at the rootsoil-microorganism interface. Position-specific 14 C and 15 N labeled alanine enabled us to trace the uptake Daniel Moran-Zuloaga and Michaela Dippold have contributed equally. Responsible Editor: Melanie A. VileElectronic supplementary material The online version of this article (improves the understanding of competing processes for LMWOS utilization in the rhizosphere.

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Dissolved Organic Nitrogen in Mediterranean Ecosystems

Cited by 30 publications

References 47 publications

Gypsophile Chemistry Unveiled: Fourier Transform Infrared (FTIR) Spectroscopy Provides New Insight into Plant Adaptations to Gypsum Soils

Gypsophile Chemistry Unveiled: Fourier Transform Infrared (FTIR) Spectroscopy Provides New Insight into Plant Adaptations to Gypsum Soils

Climatic conditions, soil fertility and atmospheric nitrogen deposition largely determine the structure and functioning of microbial communities in biocrust-dominated Mediterranean drylands

Organic nitrogen uptake by plants: reevaluation by position-specific labeling of amino acids

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