Rhizosphere priming effects on soil carbon and nitrogen dynamics among tree species with and without intraspecific competition

Yin, Liming; Dijkstra, Feike A.; Wang, Peng; Zhu, Biao; Cheng, Weixin

doi:10.1111/nph.15074

Cited by 89 publications

(75 citation statements)

References 58 publications

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“…, Yin et al. ), we did not find any positive relationship between the plant biomass and root‐derived CO 2 and RPE. In line with previous studies (Donald et al.…”

Section: Discussioncontrasting

confidence: 67%

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Rhizosphere priming effects in soil aggregates with different size classes

et al. 2020

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The change in native soil organic carbon (SOC) decomposition caused by plant roots or the rhizosphere priming effect (RPE) is a common phenomenon. Although most of the SOC is stored in aggregates with different size classes, the RPE in aggregates and the underlying mechanisms remain unclear. In a 35‐d pot experiment, we grew Agropyron cristatum (C3 plant) in pots containing large macroaggregates (LMA), small macroaggregates (SMA), and microaggregates (MA) separated from a C4 soil. We quantified the RPE and measured microbial biomass C (MBC), oxidase activity, soil net nitrogen (N) mineralization, and aggregate dynamics at the end of the experiment. The positive RPEs ranged from 47% to 106% and were significantly lower in the SMA treatment than in the LMA and MA treatments. Planting significantly increased microbial N immobilization in all treatments, particularly in the SMA treatment. Furthermore, the positive relationship between RPE and plant‐induced changes in net N mineralization suggests that increasing microbial N immobilization could reduce RPE. Planting significantly increased MBC and oxidase activity, and the positive relationships between SOC decomposition and MBC and oxidase activity suggest that microbial activation may play an important role in the positive RPEs. Planting significantly reduced aggregate destruction in the SMA treatment but increased aggregate destruction in the MA treatment, supporting the aggregate destruction hypothesis. Overall, our results showed for the first time that the RPEs varied among aggregate size classes, with potentially important consequences for SOC dynamics in soils that have a high capacity for aggregation.

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“…, Yin et al. ), we did not find any positive relationship between the plant biomass and root‐derived CO 2 and RPE. In line with previous studies (Donald et al.…”

Section: Discussioncontrasting

confidence: 67%

“…, Yin et al. ). However, less attention has been paid to soil variables (Dijkstra and Cheng , Zhu and Cheng ).…”

Section: Introductionmentioning

confidence: 99%

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Rhizosphere priming effects in soil aggregates with different size classes

et al. 2020

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“…The primary aim of this study was to investigate how plant economic strategies affect soil carbon cycling processes related to native SOC mineralization and formation through rhizodeposition and associated rhizosphere processes. In contrast with previous studies typically including up to four species only (Cheng et al, ; Wang et al, ; Yin et al, ), we used here a relatively large pool of 12 grassland species featuring contrasting economic traits (Tables and ). For instance, absolute growth rate (AGR) varied five‐fold (2.3–10.5 g plant m −2 day −1 ), leaf photosynthetic rate ( A leaf ) varied eight‐fold (39.6–307.9 nmol g −1 s −1 ) and root length density (RLD) varied nineteen‐fold (6.4–123.3 cm/cm 3 ) among species.…”

Section: Discussionmentioning

confidence: 99%

“…Plant species identity has been identified as an important factor affecting rhizodeposition (Jones, Nguyen, & Finlay, ) and the rhizosphere priming (Cheng et al, ). However, previous studies were typically limited to a small species pool (Cheng, Johnson, & Fu, ; Dijkstra & Cheng, ; Wang, Tang, Severi, Butterly, & Baldock, ; Yin, Dijkstra Feike, Wang, Zhu, & Cheng, ), and the ecophysiological mechanisms involved remain elusive. Canopy photosynthetic activity supplying labile C to the rhizosphere has been suggested to be tightly coupled with soil microbial activity and SOC mineralization (Bardgett, Bowman, Kaufmann, & Schmidt, ; Kuzyakov & Gavrichkova, ).…”

Section: Introductionmentioning

confidence: 99%

Plant economic strategies of grassland species control soil carbon dynamics through rhizodeposition

Cros²,

et al. 2019

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The plant economics spectrum is increasingly recognized as a major determinant of plant species effects on terrestrial ecosystem functioning related to carbon cycling. However, the role of plant economic strategies in the effects of living root activity on soil organic carbon (SOC) dynamics through rhizodeposition remains unexplored, despite SOC being the largest terrestrial carbon pool. Using a continuous 13C‐labelling method allowing partitioning of plant and soil sources to carbon fluxes and pools, we studied here the linkages between plant economic strategies and SOC cycling processes in a ‘common garden’ greenhouse experiment. It includes a panel of 12 grassland species selected along a gradient of economic traits and belonging to three functionnal groups (C3 grasses, forbs and legumes). All species induced an acceleration of native SOC mineralization but this rhizosphere priming effect (RPE) substantially differed across species and varied eleven‐fold by the end of the experiment (from +26% to +295% relative to unplanted soil). Interspecific variation in RPE was primarily linked to plant photosynthetic activity associated to species economic strategies of light and CO2 resource acquisition and processing. Fast‐growing acquisitive species, such as legumes, featured large RPE, in relation with their high canopy photosynthesis coupled to high leaf photosynthetic capacity and large net primary productivity allocated above‐ground. This large RPE was further associated with high root metabolic activity, rhizodeposition and soil microbial activity. In contrast, fine‐root growth and economic traits related to soil resource foraging ability were poor predictors of RPE. The formation of new root‐derived SOC varied nine‐fold across species and was similarly positively related to the net primary productivity allocated above‐ground. Fast‐growing acquisitive species with a high photosynthetic activity induced a disproportionately large RPE relative to SOC formation. Synthesis. Overall, our study demonstrates that rhizodeposition is a major mechanism through which plant economic strategies of grassland species control soil carbon dynamics. Acquisitive versus conservative species were associated with high versus low rates of photosynthesis and rhizodeposition, in turn leading to fast versus slow SOC turnover. This emphasizes the importance of considering rhizosphere processes for understanding plant species effects on soil biogeochemistry.

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Density‐ and moisture‐dependent effects of arbuscular mycorrhizal fungus on drought acclimation in wheat

Duan

Luo

Zhu

et al. 2021

Ecological Applications

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Arbuscular mycorrhizal fungus (AMF) is widely viewed as an ecosystem engineer to help plants adapt to adverse environments. However, a majority of the previous studies regarding AMF's eco‐physiological effects are mutually inconsistent. To clarify this fundamental issue, we conducted an experiment focused on wheat (Triticum aestivum L.) plants with or without AMF (Funneliformis mosseae) inoculation. Two water regimes (80% and 40% field water capacity, FWC80 (CK) and FWC40 (drought stress) and four planting densities (6 or 12 plants per pot as low densities, 24 or 48 plants per pot as high densities) were designed. AMF inoculation did not show significant effects on shoot biomass, grain yield, and water use efficiency (WUE) under the low densities, regardless of water regimes. However, under the high densities, AMF inoculation significantly decreased shoot biomass, grain yield and WUE in FWC80, while it significantly increased these parameters in FWC40, showing density and/or moisture‐dependent effects of AMF on wheat performance. In FWC40, the relationships between reproductive biomass (y‐axis) vs. vegetative biomass (x‐axis) (R‐V), and between grain biomass (y‐axis, sink) vs. leaf biomass (x‐axis, source) fell into a typical allometric pattern (α > 1, P < 0.001), and the AMF inoculation significantly increased the values of α. Yet in FWC80, they were in an isometric pattern (α ≈ 1, P < 0.001) and AMF addition had no significant effects on α. Similarly, AMF did not significantly change the isometric relationship between leaf biomass (i.e., metabolic rate) and shoot biomass (body size) in FWC80, while it significantly decreased the α of allometric relationship between both of them in FWC40 (α > 1, P < 0.001). We therefore, sketched a generalized model of R‐V and sink‐source relationships as affected by AMF, in which AMF inoculation might enhance the capabilities of sink acquisition and utilization under drought stress, while having no significant effect under the well watered conditions. Our findings demonstrate dual density‐ and moisture‐dependent effects of AMF on plant development and provide new insights into current ecological applications of AMF as an ecosystem engineer.

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Rhizosphere priming effects on soil carbon and nitrogen dynamics among tree species with and without intraspecific competition

Cited by 89 publications

References 58 publications

Rhizosphere priming effects in soil aggregates with different size classes

Rhizosphere priming effects in soil aggregates with different size classes

Plant economic strategies of grassland species control soil carbon dynamics through rhizodeposition

Density‐ and moisture‐dependent effects of arbuscular mycorrhizal fungus on drought acclimation in wheat

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