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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Global patterns and associated drivers of priming effect in response to nutrient addition
Jiguang Feng,Biao Zhu +1 more
TL;DR: In this article, a meta-analysis of 355 observations from 71 studies worldwide was conducted to explore the global patterns and associated drivers of soil organic matter decomposition and terrestrial carbon cycling, concluding that nitrogen (N) and nitrogen plus phosphorus (NP) addition significantly decreased PE, whereas phosphorus (P) addition had minimal effect on PE (P < 0.05).
SOIL BIOLOGY & BIOCHEMISTRY Soil Mineralogy Affects Conifer Forest Soil Carbon Source Utilization and Microbial Priming
TL;DR: Soil Science Society of America (SSSaj) 2006 as mentioned in this paper published a survey of the state of the art in the field of soil science and applied it to a variety of agricultural applications.
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Rhizodeposition under ambient and elevated CO2 levels
TL;DR: In this paper, the root exudation is examined in more detail and evidence is presented which suggests that current estimates of exudate flow into soils are incorrect, and a mechanistic mathematical model is used to explore how exude flows might change under elevated CO2.
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Interactive effects on organic matter processing from soils to the ocean: are priming effects relevant in aquatic ecosystems?
TL;DR: In this paper, the priming effect (PE) has been applied in this context, describing non-additive effects on organic matter degradation after mixing sources of contrasting bioavailability.
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Below ground carbon inputs to soil via root biomass and rhizodeposition of field-grown maize and wheat at harvest are independent of net primary productivity
TL;DR: In this paper, the authors determined net root biomass and rhizodeposition C of field-grown maize and wheat at harvest in different farming systems (bio-organic, conventional) and fertilization treatments (zero, manure, mineral) along an intensity gradient in two Swiss long-term field trials.