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
Biochar-induced reductions in the rhizosphere priming effect are weaker under elevated CO2
Junmin Pei,Feike A. Dijkstra,Jinquan Li,Changming Fang,Jinghua Su,Jiayuan Zhao,Ming Nie,Jihua Wu +7 more
TL;DR: In this article, the authors investigated the RPE on pre-existing organic carbon decomposition of paddy rice in a soil-plant-biochar system under eCO2 (700 ppm).
Journal ArticleDOI
The effects of Eriophorum vaginatum on N2O fluxes at a restored, extracted peatland
TL;DR: In this paper, the authors compared the N 2 O flux from plots containing a vascular plant, Eriophorum vaginatum, to plots lacking vascular plant cover at a recently restored peatland.
Journal ArticleDOI
Chronic Nitrogen Enrichment at the Watershed Scale Does Not Enhance Microbial Phosphorus Limitation
Corianne Tatariw,Jean D. MacRae,Ivan J. Fernandez,Marie-Cécile Gruselle,Cayce J. Salvino,Kevin S. Simon +5 more
TL;DR: In this paper, a combination of microbial biomass stoichiometry and enzymatic activity analyses was used to evaluate the potential for microbial nutrient limitation over the course of a growing season in response to multi-decadal, whole-watershed N enrichments and a one time, plot-scale P addition that occurred in the 22nd year of wholewatershed treatments.
Dissertation
Effects of leaf extracts, organic, inorganic fertilizers on soil ph, growth, soil macronutrients, beta-carotene of amaranthus in Kiambu County, Kenya
TL;DR: A thesis submitted in partial fulfillment of the requirements for the award of degree of Master of Science (agronomy) in the school of agriculture and enterprise development, kenyatta university.
Journal ArticleDOI
Linking absorptive roots and their functional traits with rhizosphere priming of tree species
TL;DR: It is found that the RPE of Chinese fir across the three soils decreased with an increase in soil C/N ratio, which conflicted with the N mining hypothesis and suggests that soil C stabilization mechanisms associated with clay minerals may play an important role.
References
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