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
Studies on three-source partitioning of soil respiration
TL;DR: Three⁃source partitioning of soil respiration is a useful approach to quantitatively evaluate forest underground CO2 flux as the global climate changes and the significance, methods, and applications are discussed, and the results under different conditions are summarized.
Posted ContentDOI
The effect of plant-derived carbon on rhizospheric microbial communities decomposing different litter types and nutrient return
Somak Chowdhury,Markus Lange,Ashish A. Malik,Tim Goodall,Jianbei Huang,Robert I. Griffiths,Gerd Gleixner +6 more
TL;DR: In this article, the authors performed a microcosm experiment with two plant communities differing in their association with arbuscular mycorrhizal fungi (AMF) and found that AMF-associated plant communities invested less 13C into the litter decomposing soil microbial community but gained similar amounts of 15N from litter decomposition compared to non-AMF plant communities.
Posted ContentDOI
Nutrient source and mycorrhizal association jointly alters soil microbial communities that shape plant-rhizosphere-soil carbon-nutrient flows
Somak Chowdhury,Markus Lange,Ashish A. Malik,Tim Goodall,Jianbei Huang,Robert I. Griffiths,Gerd Gleixner +6 more
TL;DR: Preliminary evidence is presented that AMF association helps plants access nutrients that are locked in bacterial and plant necromass at a lower carbon cost and that a better understanding of ecosystem processes like decomposition can only be achieved when the whole plant-microorganism-litter context is investigated.
Journal ArticleDOI
Cenchrus ciliaris root powder; a source of organic matter and plant growth promoting bacteria for wheat
TL;DR: Root powder may be a rich source of organic matter as well as Phytostimulant for better crop growth and development and the cost benefit ratio analysis for per hectare wheat production reveals that root powder application may increase the farmer's benefit by 19% in field.
Dissertation
Priming of carbon and nitrogen mineralization in forest soils
TL;DR: In this paper, the effect of root exudates on decomposition of soil organic matter (SOM) was investigated by adding glucose to soil to simulate root exuding, and the results showed that the soil C:N ratio is a poor predictor of priming.