Do nitrogen isotope patterns reflect microbial colonization of soil organic matter fractions?

Huygens, Dries; Denef, Karolien; Vandeweyer, R.; Godoy, Roberto; Cleemput, Oswald Van; Boeckx, Pascal

doi:10.1007/s00374-008-0280-8

Cited by 34 publications

(21 citation statements)

References 62 publications

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“…Considering the very similar changes with depth occurring for both soils, the 15 N enrichment with depth may be best explained by turnover and accretion of 15 N-enriched microbial compounds (Huygens et al 2008). …”

Section: Resultsmentioning

confidence: 99%

“…Sollins et al 1983Sollins et al , 2009) and could be due to the use of SPT with a density of 1.9 gcm −3 , which might mean that the fraction included some inorganic material. Densities used in other studies to separate the light fraction from volcanic material ranged between 1.35 and 1.7 gcm −3 (Huygens et al 2005(Huygens et al , 2008; Sollins et al Prior et al 2007). In this study, a density of 1.9 gcm -3 was chosen because we wanted to be sure to remove all light materials and thus tolerated a higher amount of minerals present in this fraction.…”

Section: Density Fractionationmentioning

confidence: 99%

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Contrasting composition of free and mineral-bound organic matter in top- and subsoil horizons of Andosols

et al. 2011

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Section: Resultsmentioning

confidence: 99%

Section: Density Fractionationmentioning

confidence: 99%

Contrasting composition of free and mineral-bound organic matter in top- and subsoil horizons of Andosols

et al. 2011

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“…For example, in a forest soil profile, most soil N (75-86%) was located in aggregates (Huygens et al 2008). Consequently, values of δ N with depth was shown early on to be substantial.…”

Section: Patterns Among Soil Organic Matter Fractionsmentioning

confidence: 99%

Ecological interpretations of nitrogen isotope ratios of terrestrial plants and soils

et al. 2015

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Background Knowledge of biological and climatic controls in terrestrial nitrogen (N) cycling within and across ecosystems is central to understanding global patterns of key ecosystem processes. The ratios of 15 N: 14 N in plants and soils have been used as indirect indices of N cycling parameters, yet our understanding of controls over N isotope ratios in plants and soils is still developing. Scope In this review, we provide background on the main processes that affect plant and soil N isotope ratios. In a similar manner to partitioning the roles of state factors and interactive controls in determining ecosystem traits, we review N isotopes patterns in plants and soils across a number of proximal factors that influence ecosystem properties as well as mechanisms that affect these patterns. Lastly, some remaining questions that would improve our understanding of N isotopes in terrestrial ecosystems are highlighted. Conclusion Compared to a decade ago, the global patterns of plant and soil N isotope ratios are more resolved. Additionally, we better understand how plant and soil N isotope ratios are affected by such factors as mycorrhizal fungi, climate, and microbial processing. A comprehensive understanding of the N cycle that ascribes different degrees of isotopic fractionation for each step under different conditions is closer to being realized, but a number of process-level questions still remain.

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“…Studies that have analyzed the isotopic signature of SOM fractions (beyond C 3 /C 4 labeling techniques) have found patterns of enrichment of δ 13 C and δ 15 N with increasing density of sequentially separated SOM fractions (Huygens et al, 2008;Sollins et al, 2009;Marin-Spiotta et al, 2009). Using several chemical techniques including isotopes, Mikutta et al (2006) showed that organo-mineral interactions accounted for over 70 % of the carbon stabilized in the soils they analyzed.…”

Section: Interactions With Mineral Surfacesmentioning

confidence: 99%

Carbon allocation and carbon isotope fluxes in the plant-soil-atmosphere continuum: a review

Brüggemann¹,

et al. 2011

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Abstract. The terrestrial carbon (C) cycle has received increasing interest over the past few decades, however, there is still a lack of understanding of the fate of newly assimilated C allocated within plants and to the soil, stored within ecosystems and lost to the atmosphere. Stable carbon isotope studies can give novel insights into these issues. In this review we provide an overview of an emerging picture of plant-soil-atmosphere C fluxes, as based on C isotopeCorrespondence to: N. Brüggemann (n.brueggemann@fz-juelich.de) studies, and identify processes determining related C isotope signatures. The first part of the review focuses on isotopic fractionation processes within plants during and after photosynthesis. The second major part elaborates on plantinternal and plant-rhizosphere C allocation patterns at different time scales (diel, seasonal, interannual), including the speed of C transfer and time lags in the coupling of assimilation and respiration, as well as the magnitude and controls of plant-soil C allocation and respiratory fluxes. Plant responses to changing environmental conditions, the functional relationship between the physiological and phenological status of plants and C transfer, and interactions between Published by Copernicus Publications on behalf of the European Geosciences Union. 3458 N. Brüggemann et al.: Plant-soil-atmosphere C fluxes C, water and nutrient dynamics are discussed. The role of the C counterflow from the rhizosphere to the aboveground parts of the plants, e.g. via CO 2 dissolved in the xylem water or as xylem-transported sugars, is highlighted. The third part is centered around belowground C turnover, focusing especially on above-and belowground litter inputs, soil organic matter formation and turnover, production and loss of dissolved organic C, soil respiration and CO 2 fixation by soil microbes. Furthermore, plant controls on microbial communities and activity via exudates and litter production as well as microbial community effects on C mineralization are reviewed. A further part of the paper is dedicated to physical interactions between soil CO 2 and the soil matrix, such as CO 2 diffusion and dissolution processes within the soil profile. Finally, we highlight state-of-the-art stable isotope methodologies and their latest developments. From the presented evidence we conclude that there exists a tight coupling of physical, chemical and biological processes involved in C cycling and C isotope fluxes in the plant-soil-atmosphere system. Generally, research using information from C isotopes allows an integrated view of the different processes involved. However, complex interactions among the range of processes complicate or currently impede the interpretation of isotopic signals in CO 2 or organic compounds at the plant and ecosystem level. This review tries to identify present knowledge gaps in correctly interpreting carbon stable isotope signals in the plant-soil-atmosphere system and how future research approaches could contribute to closing these gaps.

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Do nitrogen isotope patterns reflect microbial colonization of soil organic matter fractions?

Cited by 34 publications

References 62 publications

Contrasting composition of free and mineral-bound organic matter in top- and subsoil horizons of Andosols

Contrasting composition of free and mineral-bound organic matter in top- and subsoil horizons of Andosols

Ecological interpretations of nitrogen isotope ratios of terrestrial plants and soils

Carbon allocation and carbon isotope fluxes in the plant-soil-atmosphere continuum: a review

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