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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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.
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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.
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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.
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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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Modeling Soil Responses to Nitrogen and Phosphorus Fertilization Along a Soil Phosphorus Stock Gradient
TL;DR: In this article, the authors investigate the responses of soil organic carbon (C) to nitrogen (N) and phosphorus (P) additions along a soil P stock gradient of five beech forest stands in Germany, using a modelling approach.
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Determination of the biodegradability of chitosan utilizing the most probable number technique
Wender Cardoso Silva,Ilva de Fátima Souza,Vivian Machado Benassi,Juan Pedro Bretas Roa,Paulo Henrique Graziotti,David Lee Nelson,Arlete Barbosa dos Reis +6 more
TL;DR: In this article, the authors evaluated the degradability of chitosan polymer by soil microorganisms using the Most Probable Number (MPN) method by plating in drops.
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Nitrogen mineralization, not N 2 fixation, alleviates progressive nitrogen limitation – Comment on “Processes regulating progressive nitrogen limitation under elevated carbon dioxide: a meta-analysis” by Liang et al. (2016)
Abstract: The responses of terrestrial ecosystems to increasing CO2 concentrations in the atmosphere are expected to be strongly affected by nitrogen (N) availability, due to its limiting effect on ecosystem productivity (Hungate et al., 2003; Wang and Houlton, 2009). A popular 10 hypothesis is the progressive N limitation (PNL), which assumes that an enhanced net primary productivity (NPP) due to elevated CO2 leads to storage of not only carbon, but also N in long-lived ecosystems pools, such as woody biomass or soil organic matter (Luo et al., 2004). This storing of N is hypothesized to decrease the N availability for plant N uptake, posing a negative feedback to enhanced NPP. This negative feedback is expected to become 15 progressively more pronounced through time. However, in the original formulation of the PNL hypothesis, soil processes are largely ignored, though they are mentioned as potential mechanisms that can delay or prevent the development of a PNL. Data on the development of NPP stimulation under long-term free air CO2 enrichment (FACE) experiments indicate that most ecosystems have not developed a PNL on decadal scale (Feng et al., 2015), although 20 some experiments did show a clear decreased NPP stimulation due to PNL. Understanding why a PNL is often not (yet) present in most long-term FACE experiments requires a comprehensive assessment of processes that might alleviate, prevent or delay the development of a PNL.
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Impact of Restoration and Management on Aggregation and Organic Carbon Accumulation in Urban Grasslands
Jenifer L. Yost,Louise M. Egerton-Warburton,Kathryn M. Schreiner,Corey E. Palmer,Alfred E. Hartemink +4 more
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Rhizosphere bacterial and fungal communities succession patterns related to growth of poplar fine roots.
TL;DR: Fine roots growth has shaped the composition and structure of root associated bacterial and fungal communities, indicating a different succession pattern between the bacterial andFungal communities.