Light intensity controls rhizosphere respiration rate and rhizosphere priming effect of soybean and sunflower

Tang, Mao; Cheng, Weixin; Zeng, Hui; Zhu, Biao

doi:10.1016/j.rhisph.2018.12.002

Cited by 12 publications

(10 citation statements)

References 54 publications

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“…However, plant age influences the availability of root carbohydrate reserves (Bahn et al 2006); hence, in contrast to the mature forests reported in other studies, it is likely that the root C reserves were rapidly used up following shading in the young trees (3 years old) used in this study, resulting in rapid decline in root respiration. Consistent with our finding, a recent study reported that rhizosphere respirations in the presence of soybean and sunflower were positively related with light intensity, as lower rhizosphere respirations were observed from two days of subjecting the plants to varying degrees of shading (Tang et al 2019). Shading is potentially an effective partitioning method with a number of benefits compared to root exclusion methods (such as trenching and other physical separation techniques).…”

Section: Discussionsupporting

confidence: 91%

“…However, studies have shown that ECM fungi stimulate SOM decomposition as a result of C provisions from roots (Brzostek et al 2015). Experimental reduction in C allocation to ECM fungi through girdling and tree shading results in significant decreases in soil respiration and fungal biomass (Högberg and Högberg 2002;Subke et al 2004;Hasselquist et al 2016;Tang et al 2019), which implies that a reduction in assimilate C alters root respiration but may also reduce the activities of microbes in the rhizosphere, potentially reducing SOM decomposition.…”

Section: Introductionmentioning

confidence: 99%

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Rhizosphere carbon supply accelerates soil organic matter decomposition in the presence of fresh organic substrates

et al. 2019

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Background and aims Belowground C supply from plant roots may accelerate the decomposition of SOM through the rhizosphere priming effect, but the detailed interaction between substrate quality and rhizosphere C supply is poorly understood. We hypothesize that decomposition of organic matter is enhanced by the combined effect of assimilate C supply to the rhizosphere and substrate amendments. Methods Birch trees (Betula pendula) planted in experimental mesocosms; half of these trees were shaded to reduce the supply of assimilate C to roots and ECM fungi. Either 13 C-enriched glucose, straw, fungal necromass or C 4 biochar were subsequently added to each mesocosm. CO 2 efflux derived from substrates were separated from that derived from native SOM and roots based on the isotopic composition of total respired CO 2. Results The addition of all substrates increased fluxes in both un-shaded and shaded treatments, with greatest total CO 2 efflux observed in soils amended with straw. Increases in un-labelled CO 2 were observed to be greater in the presence of belowground C supply than in mesocosms with shaded trees. Conclusions Turnover of SOM is closely linked to belowground C allocation. The biochemical quality and recalcitrance of litter entering the soil C pool is of critical importance to this priming, as is the interaction with rhizosphere-associated decomposition activity. Keywords Soil CO 2 efflux. Ectomycorrhizal fungi. Priming effect. Soil microbial activity. Stable C isotopes Abbreviations C Carbon SOM Soil organic matter ECM Ectomycorrhiza N Nitrogen PE Priming effect RPE Rhizosphere priming effect

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Section: Discussionsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Rhizosphere carbon supply accelerates soil organic matter decomposition in the presence of fresh organic substrates

et al. 2019

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“…There were differences in the effects of SOC stability on root biomass in the growth chamber and glasshouse (Fig. 1), probably related to differences in soil nutrients and growth conditions (Table S1; Tang et al ., 2019). The effect of SOC stability on RPE was independent of root biomass and respiration in both growth chamber and glasshouse experiments (Table S3).…”

Section: Discussionmentioning

confidence: 99%

“…During the period of plant growth, the setup of the growth chamber (the first three batches) was identical to that of Tang et al . (2019), and the setup of the glasshouse (the fourth batch) was identical to that of Zhu et al . (2014).…”

Section: Methodsmentioning

confidence: 99%

A distinct sensitivity to the priming effect between labile and stable soil organic carbon

Zhang

Feng

et al. 2022

New Phytologist

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Soil organic carbon (SOC) is a mixture of various carbon (C) compounds with different stability, which can be distinctly affected by the priming effect (PE). However, little is known about how the PE changes with SOC stability.We address this issue by combining results from two experiments and a metaanalysis. We found that the PE increased with the prolongation of soil preincubation, suggesting that higher PE occurred for more stable SOC than for labile SOC. This was further supported by the metaanalysis of 42 observations. There were significant negative relationships between the difference in PE (ΔPE) between labile and more stable SOC and their differences in SOC, microbial biomass C and soil C : N ratio, indicating that soil C availability exerts a vital control on ΔPE.We conclude that, compared with labile SOC, stable SOC can be more vulnerable to priming once microbes are provided with exogenous C substrates. This high vulnerability of stable SOC to priming warrants more attention in future studies on SOC cycling and global change.

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“…Enhanced plant photosynthesis and nutrient demand under elevated CO 2 increase the PIPE, soil organic N mineralisation and plant N uptake in many different contexts (de Graaff et al., 2009; Kuzyakov, 2019). In contrast, decreased plant photosynthesis (plant demand) in response to plant shading/cutting induces reduced SOM mineralisation (Shahzad et al., 2012; Tang et al., 2019). In temperate ecosystems, the mineralisation/immobilisation ratio changes throughout the season in line with plant demands; immobilisation dominates in winter (low demand), whereas mineralisation dominates in spring (high demand) (Bardgett et al., 2005; Yokobe et al., 2018).…”

Section: Consequences Of Pe On Ecosystem Services Under Global Change...mentioning

confidence: 99%

Advancing the mechanistic understanding of the priming effect on soil organic matter mineralisation

et al. 2022

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The priming effect (PE) is a key mechanism contributing to the carbon balance of the soil ecosystem. Almost 100 years of research since its discovery in 1926 have led to a rich body of scientific publications to identify the drivers and mechanisms involved. A few review articles have summarised the acquired knowledge; the last major one was published in 2010. Since then, knowledge on the soil microbial communities involved in PE and in PE + C sequestration mechanisms has been considerably renewed. This article reviews current knowledge on soil PE to state to what extent new insights may improve our ability to understand and predict the evolution of soil C stocks. We propose a framework to unify the different concepts and terms that have emerged from the international scientific community on this topic, report recent discoveries and identify key research needs. Seventy per cent of the studies on the soil PE were published in the last 10 years, illustrating a renewed interest for PE, probably linked to the increased concern about the importance of soil carbon for climate change and food security issues. Among all the drivers and mechanisms proposed along with the different studies to explain PE, some are named differently but actually refer to the same object. This overall introduces ‘artificial’ complexity for the mechanistic understanding of PE, and we propose a common, shared terminology. Despite the remaining knowledge gaps, consistent progress has been achieved to decipher the abiotic mechanisms underlying PE, together with the role of enzymes and the identity of the microbial actors involved. However, including PE into mechanistic models of SOM dynamics remains challenging as long as the mechanisms are not fully understood. In the meantime, empirical alternatives are available that reproduce observations accurately when calibration is robust. Based on the current state of knowledge, we propose different scenarios depicting to what extent PE may impact ecosystem services under climate change conditions. Read the free Plain Language Summary for this article on the Journal blog.

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Light intensity controls rhizosphere respiration rate and rhizosphere priming effect of soybean and sunflower

Cited by 12 publications

References 54 publications

Rhizosphere carbon supply accelerates soil organic matter decomposition in the presence of fresh organic substrates

Rhizosphere carbon supply accelerates soil organic matter decomposition in the presence of fresh organic substrates

A distinct sensitivity to the priming effect between labile and stable soil organic carbon

Advancing the mechanistic understanding of the priming effect on soil organic matter mineralisation

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