Shifts in understory plant composition induced by nitrogen addition predict soil fungal beta diversity in a boreal forest

Xing, Aijun; Xu, Longchao; Zhao, Mengying; Shen, Haihua; Ma, Suhui; Fang, Jingyun

doi:10.1007/s00374-022-01652-x

Cited by 6 publications

(3 citation statements)

References 73 publications

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Section: Introductionmentioning

confidence: 99%

“…The stratum of understory vegetation preserves about 80% of plant biodiversity in temperate forests (Gilliam, 2007). Considering that understory vegetation is an important component of forest ecosystems, functional changes in understory vegetation can substantially affect forest structure and function, such as tree regeneration, carbonnutrient-water cycling, and stability (Gilliam, 2007;Gilliam et al, 2016;Giuggiola et al, 2018;Landuyt et al, 2019;Blondeel et al, 2020;Xing et al, 2022). For example, in a recent review, Balandier et al (2022) reported that understory vegetation contributed one-third of ecosystem evapotranspiration in boreal and temperate forests, and the removal of understory vegetation could reduce water competition, with subsequent consequence of increasing soil water content and stimulating sap flow and the growth of overstory tree species (e.g., mean annual radial growth increased by 4.6-fold, Giuggiola et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

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Stability in the leaf functional traits of understory herbaceous species after 12-yr of nitrogen addition in temperate larch plantations

Yan,

Wang,

Wang

et al. 2023

Front. Plant Sci.

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Leaf functional traits play critical roles in plant functioning. Although the functional traits of overstory trees have been extensively studied, minimal research has been conducted regarding understory species, despite the understory layer is an important component of temperate forests. Such insufficiency limit the broader understanding of processes and functions in forest ecosystems, particularly when under the increasing atmospheric nitrogen (N) deposition. Here, we investigated the responses of 18 leaf functional traits in six understory herbaceous species within young and mature stands (three species per stand) in larch (Larix principis-rupprechtii) plantations that subjected to 12 years of anthropogenic N addition. We found that N addition did not significantly impact the photosynthetic traits of understory herbaceous species in either stand; it only led to increased chlorophyll content in Geum aleppicum Jacq. Similarly, with the exception of decreases in the predawn leaf water potential of Sanguisorba officinalis L., N addition did not significantly affect leaf hydraulic traits. With the exception of changes to adaxial epidermis thickness in Potentilla chinensis Ser. (decreased) and G. aleppicum (increased), N addition had negligible effects on leaf anatomical traits and specific leaf area, however, interspecific variations in the plasticity of leaf anatomical traits were observed. Stable responses to N addition were also observed for nonstructural carbohydrates (NSC) and their components (soluble sugars and starch), with the exception of Polygonum divaricatum L., which exhibited increases in NSC. Overall, our results suggest that the functional traits of understory herbaceous species exhibit stability under conditions of long-term N enrichment in temperate plantations.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Stability in the leaf functional traits of understory herbaceous species after 12-yr of nitrogen addition in temperate larch plantations

Yan,

Wang,

Wang

et al. 2023

Front. Plant Sci.

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“…communities are largely caused by changes in soil properties in the context of N deposition(Leff et al 2015;Xing et al 2022c). Overall, soil properties played a predominant role in the response of MR to N addition in the medium soil layer (Fig.3d), presumably because the effect of N-induced soil property changes on the MR outweighed the effects of N-induced changes in soil microbial communities(Niu et al 2021).…”

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confidence: 99%

Depth-dependent responses of soil microbial respiration to nitrogen addition in a temperate steppe in Inner Mongolia

Jiang,

Wang,

et al. 2023

Preprint

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Background and aims Over the past few decades, terrestrial ecosystems have experienced rising atmospheric nitrogen (N) deposition, which further impacts the global carbon (C) budget through soil microbial respiration (MR). However, the effects of N deposition on MR are rarely characterized in subsoil (depth > 10 cm) rather than in topsoil (0–10 cm). This study attempted to elucidate how N deposition regulates MR along the soil profile and its underlying mechanism. Methods We collected soil samples and determined MR across three soil layers (shallow, medium, and deep) from a decade-long and five-level N addition experiment in a temperate steppe in Inner Mongolia. We further used structural equation modeling to explore how long-term N addition regulates MR through various biotic (plant attributes and microbial community structure) and abiotic (soil properties) factors across the three soil layers. Results The overall response of MR to N addition varied with soil depth, shifting from stimulation in the shallow soil layer (standardized total effect of 0.36) to inhibition in the medium and deep soil layers (-0.34 and − 0.31). The identified direct and indirect pathways by which N addition regulates MR significantly differed across soil layers. Conclusion As soil depth increases, the suppressive effect of N deposition on MR provides evidence that increasing N deposition may contribute to C accrual in the subsoil in grassland ecosystems.

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Long-term nitrogen addition reduced soil respiration contributed by decline in the understory plant cover but not species richness

et al. 2023

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Shifts in understory plant composition induced by nitrogen addition predict soil fungal beta diversity in a boreal forest

Cited by 6 publications

References 73 publications

Stability in the leaf functional traits of understory herbaceous species after 12-yr of nitrogen addition in temperate larch plantations

Stability in the leaf functional traits of understory herbaceous species after 12-yr of nitrogen addition in temperate larch plantations

Depth-dependent responses of soil microbial respiration to nitrogen addition in a temperate steppe in Inner Mongolia

Long-term nitrogen addition reduced soil respiration contributed by decline in the understory plant cover but not species richness

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