Mycorrhizal type effects on leaf litter decomposition depend on litter quality and environmental context

Seyfried, Georgia S.; Dalling, James W.; Yang, Wendy H.

doi:10.1007/s10533-021-00810-x

Cited by 27 publications

(20 citation statements)

References 66 publications

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“…The lack of consistent relations between soil C/N ratio, F/B ratio and pH with EcM tree abundance in our dataset does not support this hypothesis. In addition, previous studies found no differences in litter chemistry (Averill, 2016; Keller & Phillips, 2019) nor litter decay rates (Keller & Phillips, 2019; Seyfried et al, 2021) between tropical AM and EcM plant species. SOM decomposition : Generally, the lower C and nutrient concentrations found in EcM stands could be related to faster SOM transformation rates. However, the decrease in the total biomass of bacteria may indicate that the rate and magnitude of C and nutrient transformation processes are lower in EcM tropical forests than in AM forests.…”

Section: Discussionmentioning

confidence: 80%

Section: Biogeochemical Patterns In Tropical Ecm Forestsmentioning

confidence: 75%

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Mycorrhizal tree impacts on topsoil biogeochemical properties in tropical forests

et al. 2022

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In tropical regions, the patterns of carbon (C) and nutrient properties among ecosystems dominated by distinct mycorrhizal associations are unknown. We aim to reveal whether the dynamics differ and the ecological drivers and ecosystem functioning implications of such differences. Based on a dataset of 97 tropical forest sites, we related EcM trees abundance (as a proxy for the transition from AM to EcM trees dominance) to different topsoil properties, climatic conditions and microbial abundance proxies through Generalized Additive Models. Higher abundances of EcM trees were correlated with higher topsoil concentrations of total nitrogen and C, extractable phosphorus and potassium, δ13C, mean annual temperature, precipitation, microbial (bacterial and fungal) biomass and the relative abundance of saprotrophic fungi. Synthesis. Our results reveal consistent differences in carbon and nutrient content between arbuscular mycorrhizal (AM‐) and EcM‐dominated vegetation across the tropical biome, pointing to lower soil fertility and lower rates of C and nutrient transformation processes in EcM‐dominated forests. These patterns associate with lower topsoil C accumulation when compared to AM vegetation, which contrasts with patterns reported for temperate forests. We suggest that different mechanisms of soil organic matter accumulation explain the contrasting impacts of EcM dominance on topsoil properties of temperate and tropical biomes. Global vegetation and C models should account for the contrasting impacts of distinct mycorrhizal vegetation in different climatic zones.

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Section: Discussionmentioning

confidence: 80%

Section: Biogeochemical Patterns In Tropical Ecm Forestsmentioning

confidence: 75%

Mycorrhizal tree impacts on topsoil biogeochemical properties in tropical forests

et al. 2022

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“…For example, dominant species in SL, PF, MF, and NSF belong to different life types, shrub, coniferous species, mixed needle–broad-leaved species, and broad-leaved species, respectively. Meanwhile, litter quality and quantity and mycorrhizal types also showed obvious difference in ecological and biological attributes [ 44 , 45 , 46 ]. Therefore, according to the results of this study, the selection of dominant species adapted to low soil moisture and available phosphorus and the construction of plant communities based on selected species can effectively drive community assembly and ecosystem functions in the vegetation restoration process.…”

Section: Discussionmentioning

confidence: 99%

Soil Moisture and Available Phosphorus as the Factors Driving Variation in Functional Characteristics across Different Restoration Communities in a Subtropical Mountain Ecosystem

Shen

et al. 2023

Biology

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Functional characteristics are increasingly used to evaluate the success of different vegetation restoration. Community functional diversity (FD) and the community-weighted mean (CWM), as two main complementary components, are closely linked to site environment and ecosystem functions. However, the patterns and driving factors of functional characteristics are still not clear in different vegetation restoration types. Here, four community restoration types (secondary shrubland, SL; Pinus yunnanensis forest, PF; mixed needle–broad-leaved forest, MF; natural secondary forest, NSF) were selected to investigate species diversity, FD, CWM, and soil physicochemical properties. The relative effects of species diversity and soil abiotic features on variation in functional characteristics were then evaluated. We found that different restoration communities altered most community structures and functional properties in terms of species diversity, FD, and CWM. CWM values and FD in different communities presented different distribution patterns depending on certain traits and parameters. Significant correlations between functional traits were found at the species and community scales, suggesting a potential covariation between these selected traits in communities. The results of redundancy analysis and variation partitioning showed that most of the variation in functional characteristics, especially CWM, was explained by soil moisture and available phosphorus, indicating that habitat filters regulate the functional characteristics of plant communities mainly by changing the dominant species composition and functional traits of species. Therefore, the selection of restoration species adapted to low soil moisture and available phosphorus and the construction of communities based on selected species as the dominant species can effectively drive community assembly and ecosystem functions in the vegetation restoration process.

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“…In EM-dominated sites, organic matter accumulates in the soil due to a low decomposition rate, while mycorrhizal uptake of N directly from organic matter reduces inorganic N availability (Lin et al, 2017;Phillips et al, 2013). However, differences in organic matter accumulation and N availability can appear even when decomposition rates are similar for litter produced by AM and EM trees (Kyaschenko et al, 2017;Seyfried et al, 2021). Reductions in N availability and increases in organic matter have also been observed at 1,000 m a.s.l., associated with the EM tree O. mexicana when compared to nearby mixed forest (Corrales et al, 2016;Dalling et al, 2021).…”

Section: Differences In Soil Chemistry and Physical Properties Between Adjacent Oak And Mixed Forest Standsmentioning

confidence: 96%

Growth responses of ectomycorrhizal and arbuscular mycorrhizal seedlings to low soil nitrogen availability in a tropical montane forest

2021

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1. Differences in nutrient acquisition pathways between arbuscular mycorrhizal (AM) and ectomycorrhizal (EM) fungi are associated with greater soil organic matter accumulation and reduced inorganic nitrogen (N) availability in EM-dominated forests. These plant-soil feedbacks are expected to influence seedling recruitment and the maintenance of diversity.2. Montane forests of Central America are characterized by a mosaic of AM and EM dominance. We used a seedling transplant and soil manipulation experiment on Volcán Barú, Panama, to evaluate whether patches of oak (EM-dominated) forest and mixed (AM-dominated) forest affect seedling growth. We predicted that (a) plant-soil feedbacks would result in lower soil inorganic N availability in oak than in mixed forests, (b) consequently AM seedlings would grow more slowly and have lower foliar N concentrations in oak forest and (c) dependence of EM seedlings on organic N uptake via mycorrhiza would mean that inorganic N addition would increase seedling performance for AM but not EM (i.e. oak) seedlings. As soil organic matter accumulation may affect seedling performance beyond altering nutrient supply, we also tested whether organic matter removal differentially affected AM and EM seedlings.3. Nitrogen availability was six times lower and the soil organic layer three times deeper in oak-dominated stands compared to mixed stands. Foliar N was lower for AM seedlings growing in oak than in mixed forest, but did not differ for oak seedlings and was increased only marginally by N addition for both AM and EM seedlings growing in both AM and EM forests. Seedling growth did not respond to N addition or organic matter removal. However, AM seedlings generally grew slower in oak forest compared with AM forest, consistent with lower foliar N concentration and low-light availability. These results suggest that changes in soil nitrogen availability have a limited effect on seedling growth. 4. In the neotropics, EM tree communities occur at high elevation. Future upslope migration of trees may result in AM-dominated tree communities encountering unfavourable soil conditions generated by EM-dominated canopies. While longer term experiments are needed, our results suggest that AM seedlings may not be able to tolerate conditions associated with EM forest.

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Mycorrhizal type effects on leaf litter decomposition depend on litter quality and environmental context

Cited by 27 publications

References 66 publications

Mycorrhizal tree impacts on topsoil biogeochemical properties in tropical forests

Mycorrhizal tree impacts on topsoil biogeochemical properties in tropical forests

Soil Moisture and Available Phosphorus as the Factors Driving Variation in Functional Characteristics across Different Restoration Communities in a Subtropical Mountain Ecosystem

Growth responses of ectomycorrhizal and arbuscular mycorrhizal seedlings to low soil nitrogen availability in a tropical montane forest

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