Open Access
Rhizosphere Priming: a Nutrient Perspective
Feike A. Dijkstra,Yolima Carrillo,Elise Pendall,Jack A. Morgan +3 more
- Vol. 2013
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TLDR
It is postulate that rhizosphere priming may enhance N supply to plants in systems that are N limited, but thatrhizospherePriming may not occur in Systems that are phosphorus (P) limited, because under P limitation, rhizodeposition may be used for mobilization of P, rather than for decomposition of SOM.Abstract:
Rhizosphere priming is the change in decomposition of soil organic matter (SOM) caused by root activity. Rhizosphere priming plays a crucial role in soil carbon (C) dynamics and their response to global climate change. Rhizosphere priming may be affected by soil nutrient availability, but rhizosphere priming itself can also affect nutrient supply to plants. These interactive effects may be of particular relevance in understanding the sustained increase in plant growth and nutrient supply in response to a rise in atmospheric CO2 concentration. We examined how these interactions were affected by elevated CO2 in two similar semiarid grassland field studies. We found that an increase in rhizosphere priming enhanced the release of nitrogen (N) through decomposition of a larger fraction of SOM in one study, but not in the other. We postulate that rhizosphere priming may enhance N supply to plants in systems that are N limited, but that rhizosphere priming may not occur in systems that are phosphorus (P) limited. Under P limitation, rhizodeposition may be used for mobilisation of P, rather than for decomposition of SOM. Therefore, with increasing atmospheric CO2 concentrations, rhizosphere priming may play a larger role in affecting C sequestration in N poor than in P poor soils.read more
Citations
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Journal ArticleDOI
Going underground: root traits as drivers of ecosystem processes
TL;DR: Emerging evidence that illustrates how root traits impact ecosystem processes is synthesised, and a pathway to unravel the complex roles of root traits in driving ecosystem processes and their response to global change is proposed.
Journal ArticleDOI
Root Exudation of Primary Metabolites: Mechanisms and Their Roles in Plant Responses to Environmental Stimuli.
TL;DR: This review synthetize recent advances in ecology and plant biology to explain and propose mechanisms by which root exudation of primary metabolites is controlled, and what role theirExudation plays in plant nutrient acquisition strategies, and proposes a novel conceptual framework forRoot exudates.
Journal ArticleDOI
Stoichiometric imbalances between terrestrial decomposer communities and their resources: mechanisms and implications of microbial adaptations to their resources
TL;DR: This review summarizes different views on how microbes cope with imbalanced supply of C, N and P, thereby providing a framework for integrating and linking microbial adaptation to resource imbalances to ecosystem scale fluxes across scales and ecosystems.
Journal ArticleDOI
Rhizosphere processes are quantitatively important components of terrestrial carbon and nutrient cycles.
Adrien C. Finzi,R. Z. Abramoff,Kimberly S. Spiller,Edward R. Brzostek,Bridget A. Darby,Bridget A. Darby,Mark A. Kramer,Richard P. Phillips +7 more
TL;DR: It is shown that root-accelerated mineralization and priming can account for up to one-third of the total C and N mineralized in temperate forest soils and that rhizosphere processes are a widespread, quantitatively important driver of SOM decomposition and nutrient release at the ecosystem scale.
References
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Journal ArticleDOI
Root exudation of mature beech forests across a nutrient availability gradient: the role of root morphology and fungal activity
Ina C. Meier,Timo Tückmantel,Julian Heitkötter,Karolin Müller,Sebastian Preusser,Thomas J. Wrobel,Ellen Kandeler,Bernd Marschner,Christoph Leuschner +8 more
TL;DR: It is concluded that root exudation increases on highly acidic, N-poor soils, in which fungal activity is reduced and a greater portion of the assimilated C is shifted to the external ecosystem carbon cycle.
Journal ArticleDOI
Elevated CO2 and nitrogen influence exudation of soluble organic compounds by ectomycorrhizal root systems
Petra Fransson,Emma M. Johansson +1 more
TL;DR: Root and mycelial exudation contributes significantly to soil carbon (C) fluxes, and is likely to be altered by an elevated atmospheric carbon dioxide (CO(2)) concentration and nitrogen (N) deposition, although with very contrasting effects depending on which N source was supplied.
Book ChapterDOI
Should phosphorus availability be constraining moist tropical forest responses to increasing CO2 concentrations
TL;DR: In this paper, the authors examined several factors that prevent low levels of available phosphorus (P) significantly constraining moist tropical forest growth in response to an increase in atmospheric carbon dioxide concentrations.
Journal ArticleDOI
Evaluation of mechanisms controlling the priming of soil carbon along a substrate age gradient
TL;DR: In this article, the authors used a three million year substrate age gradient, with associated changes in nutrient availability and microbial communities, to test the mechanisms of the priming effect and found no significant relationships between priming and phosphorus availability.
Journal ArticleDOI
Interactions between phosphorus availability and an AM fungus (Glomus intraradices) and their effects on soil microbial respiration, biomass and enzyme activities in a calcareous soil
Fayez Raiesi,Mahmoud Ghollarata +1 more
TL;DR: Soil microbial activity depended on the addition of P and/or the presence of AM fungus, which could affect either P or C availability, and both P and C availability may concurrently limit the microbial activity in these calcareous P-fixing soils.