Rhizosphere priming effect on soil organic carbon decomposition under plant species differing in soil acidification and root exudation

Wang, Xiaojuan; Tang, Caixian; Severi, Julia; Butterly, Clayton R.; Baldock, J. A.

doi:10.1111/nph.13966

Cited by 131 publications

(82 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Fine-root growth was unrelated to the RPE (fine-root NPP, Figure 2), in line with a recent meta-analysis (Huo et al, 2017). Furthermore, fine-root morphological and architectural traits related to soil exploration were poor predictors of the RPE (Figure 2, Table 3), in accordance with previous studies Wang et al, 2016…”

Section: Plant Economic Traitssupporting

confidence: 89%

“…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, 2014;Wang et al, 2016;Yin et al, 2018), we used here a relatively large pool of 12 grassland species featuring contrasting economic traits (Tables 1 and 2 . Functional groups (FG) are represented by blue squares, orange triangles and green circles for grasses, forbs and legumes species, respectively.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

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

Cros²,

et al. 2019

View full text Add to dashboard Cite

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.

show abstract

Section: Plant Economic Traitssupporting

confidence: 89%

Section: Discussionmentioning

confidence: 99%

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

Cros²,

et al. 2019

View full text Add to dashboard Cite

show abstract

“…We also demonstrated significant positive correlations between the ‘primed C’ and root‐derived CO 2 , root, shoot and total biomass, respectively, within each species (Fig. ), which is largely in accordance with previous studies (Dijkstra & Cheng, ; Bengtson et al ., ; Zhu et al ., ; Wang et al ., ). For example, Chinese fir had the greatest growth rate and shoot biomass (Table ), possibly supporting a high rate of root exudation (as indicated by root‐derived CO 2 , assuming that root‐derived CO 2 is proportional to root exudation, Fig.…”

Section: Discussionmentioning

confidence: 99%

“…Previous studies under artificial environmental conditions have shown that the magnitude and direction of RPEs vary significantly with plant species and soil variables (summarized by Cheng et al ., ). Using 13 C‐labeling approaches, it was shown that the direction and magnitude of the RPE depend on soil type and N status (Fontaine et al ., ; Kumar et al ., ; Lloyd et al ., ), but also on plant species and associated traits, such as rhizosphere acidification (Wang et al ., ), fine root morphology (Pausch et al ., ) and root exudation (Dijkstra & Cheng, ; Bengtson et al ., ; Zhu et al ., ). Nevertheless, effects of tree species on RPEs remain unclear, even though a recent meta‐analysis showed that trees caused the highest RPE compared to other functional types such as grasses and crops (Huo et al ., ).…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2018

View full text Add to dashboard Cite

Rhizosphere priming effects (RPEs) play a central role in modifying soil organic matter mineralization. However, effects of tree species and intraspecific competition on RPEs are poorly understood. We investigated RPEs of three tree species (larch, ash and Chinese fir) and the impact of intraspecific competition of these species on the RPE by growing them at two planting densities for 140 d. We determined the RPE on soil organic carbon (C) decomposition, gross and net nitrogen (N) mineralization and net plant N acquisition. Differences in the RPE among species were associated with differences in plant biomass. Gross N mineralization and net plant N acquisition increased, but net N mineralization decreased, as the RPE on soil organic C decomposition increased. Intraspecific competition reduced the RPE on soil organic C decomposition, gross and net N mineralization, and net plant N acquisition, especially for ash and Chinese fir. Microbial N mining may explain the overall positive RPEs across species, whereas intensified plant-microbe competition for N may have reduced the RPE with intraspecific competition. Overall, the species-specific effects of tree species play an important role in modulating the magnitude and mechanisms of RPEs and the intraspecific competition on soil C and N dynamics.

show abstract

“…4; Table 1). Root exudates contain organic compounds that can acidify rhizosphere soils and suppress microbial responses (Wang et al 2016). The organic compounds that constitute root exudates may vary greatly among species (Badri and Vivanco 2009), thereby resulting in species-specific impacts on rhizosphere soils.…”

Section: Species Variations Of Root-exudate Fluxes In Relation To Funmentioning

confidence: 99%

Root‐exudate flux variations among four co‐existing canopy species in a temperate forest, Japan

Sun

Kominami

Yoshimura

et al. 2017

Ecological Research

View full text Add to dashboard Cite

Plants allocate carbon to root exudates to mine nitrogen (N) from soil organic matter (SOM). Little is known about how the root‐exudation rate varies among co‐existing woody species. We conducted an in situ experiment in a warm temperate forest on two dominant species, Quercus serrata and Ilex pedunculosa, and two of their congeneric species, Quercus glauca and Ilex macropoda, respectively. We hypothesized that the root‐exudation rate varies among these species because of their distinct functional traits and N demands. Root‐exudation rates were measured using a non‐soil culture method during the growing season from June 2013 to May 2014. We also measured foliar N concentrations and the activities of N‐degrading enzymes in the rhizosphere soils. The annual demand for N was calculated from the growth rate and allometric equations for biomass. The root‐exudation rates of Q. serrata and I. macropoda were consistently greater than those of their congeneric evergreen species on root‐length, root‐weight, and individual‐tree bases. The variations of the annual N demand of these species mirrored this pattern. Within a species, root‐exudation rates correlated positively to leaf N contents, suggesting a physiological linkage between photosynthetic capacities and belowground carbon allocation. Root‐exudation rates also correlated positively to the activities of polyphenol oxidase, an enzyme that decomposes N from recalcitrant SOM. Our results suggest that the variations of the root‐exudation among co‐existing species relate to their functional traits and demand for N.

show abstract

Rhizosphere priming effect on soil organic carbon decomposition under plant species differing in soil acidification and root exudation

Cited by 131 publications

References 51 publications

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

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

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

Root‐exudate flux variations among four co‐existing canopy species in a temperate forest, Japan

Contact Info

Product

Resources

About