The vertical distribution pattern of microbial- and plant-derived carbon in the rhizosphere in alpine coniferous forests

Gao, Wentong; Wang, Qitong; Zhu, Xiaoyun; Liu, Zhanfeng; Li, Na; Xiao, Juan; Sun, Xiaoping; Yin, Huajun

doi:10.1016/j.rhisph.2021.100436

Cited by 16 publications

(6 citation statements)

References 70 publications

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“…In this study, we collected data of microbial residue C in whole coastal wetlands of China S9). This result has been confirmed by other studies in cropland (Chen et al, 2021), grassland (Ma et al, 2020) and forest (Gao et al, 2021;Jia et al, 2021), which can be applicable to a global scale. Therefore, how plants and microbes contribute to the formation and accumulation of different SOC pools is a fundamental and much-debated question related to SOC dynamics and the response to global climate change.…”

Section: Implications and Uncertainties Of Plantderived Lignin For We...supporting

confidence: 87%

“…The relative frequency of SOC‐normalized lignin content in coastal wetlands (a) and contents of lignin in surface soil layers from wetlands and other terrestrial ecosystems (b), including paddy and upland (Chen et al, 2021), alpine grassland and temperate grassland (Ma et al, 2020), coniferous forest (Gao et al, 2021) and broad‐leaved forest (Jia et al, 2021). …”

Section: Resultsmentioning

confidence: 99%

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Patterns and determinants of plant‐derived lignin phenols in coastal wetlands: Implications for organic C accumulation

et al. 2023

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1. As a major plant-derived soil organic carbon (SOC) component, lignin phenols are unique biomarkers that reflect biogeochemical characteristics under different vegetation compositions and climatic zones in coastal wetlands. However, the latitudinal patterns of plant-derived lignin phenols to SOC and their link with the stability and controlling mechanisms remain poorly understood.2. A total of 156 soil samples from 39 sites along a 5000 km coastal transect, were taken to explore the effects of biological and environmental controls on the patterns of lignin phenols. Lignin phenols had contents ranging from 1.91 to 83.3 mg g −1 OC, and a positive correlation was detected in grass-dominated salt marsh, but a weakly negative correlation in mangrove. Positive correlations between SOC or lignin content and C/V or S/V (the cinnamyl-or syringyl-tovanillyl) ratios were found, while overall negative correlations between SOC or lignin content and (Ad/Al) V or (Ad/Al) S (the acid-to-aldehyde of vanillyl or syringyl units) ratios were detected, respectively, which confirmed the validity of these lignin biomarker degradation parameters.3. Our findings revealed that plant C inputs and monomer ratios directly influenced the capacity of lignin phenols in soils. Lignin content and stabilization was mainly controlled by soil properties (i.e. pH, EC sand/clay). Mean annual temperature (MAT) influenced the patterns of lignin phenols both directly by increasing decomposition and indirectly by changing the vegetation and soil biogeochemistry (i.e. microbial substrate availability).

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Section: Implications and Uncertainties Of Plantderived Lignin For We...supporting

confidence: 87%

Section: Resultsmentioning

confidence: 99%

Patterns and determinants of plant‐derived lignin phenols in coastal wetlands: Implications for organic C accumulation

et al. 2023

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“…This disparity can be attributed to the accumulation of decomposed plant litter primarily in the surface layer, as well as the limited nutrient input with increasing soil depth. Additionally, the reduced activity of soil microorganisms in the lower layer contributed to a noticeable aggregation of SOC in the vertical distribution (Gao et al, 2021). The results of this study showed that the surface SOC content was higher under the N 1 P 2 treatment compared to the other treatments.…”

Section: Effect Of Nitrogen and Phosphorus Application On Soil Organi...mentioning

confidence: 67%

Optimizing nitrogen and phosphorus application to improve soil organic carbon and alfalfa hay yield in alfalfa fields

Wei,

Zhao,

Sun

et al. 2024

Front. Plant Sci.

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Soil organic carbon (SOC) is the principal factor contributing to enhanced soil fertility and also functions as the major carbon sink within terrestrial ecosystems. Applying fertilizer is a crucial agricultural practice that enhances SOC and promotes crop yields. Nevertheless, the response of SOC, active organic carbon fraction and hay yield to nitrogen and phosphorus application is still unclear. The objective of this study was to investigate the impact of nitrogen-phosphorus interactions on SOC, active organic carbon fractions and hay yield in alfalfa fields. A two-factor randomized group design was employed in this study, with two nitrogen levels of 0 kg·ha-1 (N0) and 120 kg·ha-1 (N1) and four phosphorus levels of 0 kg·ha-1 (P0), 50 kg·ha-1 (P1), 100 kg·ha-1 (P2) and 150 kg·ha-1 (P3). The results showed that the nitrogen and phosphorus treatments increased SOC, easily oxidized organic carbon (EOC), dissolved organic carbon (DOC), particulate organic carbon (POC), microbial biomass carbon (MBC) and hay yield in alfalfa fields, and increased with the duration of fertilizer application, reaching a maximum under N1P2 or N1P3 treatments. The increases in SOC, EOC, DOC, POC, MBC content and hay yield in the 0–60 cm soil layer of the alfalfa field were 9.11%-21.85%, 1.07%-25.01%, 6.94%-22.03%, 10.36%-44.15%, 26.46%-62.61% and 5.51%-23.25% for the nitrogen and phosphorus treatments, respectively. The vertical distribution of SOC, EOC, DOC and POC contents under all nitrogen and phosphorus treatments was highest in the 0–20 cm soil layer and tended to decrease with increasing depth of the soil layer. The MBC content was highest in the 10–30 cm soil layer. DOC/SOC, MBC/SOC (excluding N0P1 treatment) and POC/SOC were all higher in the 0–40 cm soil layer of the alfalfa field compared to the N0P0 treatment, indicating that the nitrogen and phosphorus treatments effectively improved soil fertility, while EOC/SOC and DOC/SOC were both lower in the 40–60 cm soil layer than in the N0P0 treatment, indicating that the nitrogen and phosphorus treatments improved soil carbon sequestration potential. The soil layer between 0-30 cm exhibited the highest sensitivity index for MBC, whereas the soil layer between 30-60 cm had the highest sensitivity index for POC. This suggests that the indication for changes in SOC due to nitrogen and phosphorus treatment shifted from MBC to POC as the soil depth increased. Meanwhile, except the 20–30 cm layer of soil in the N0P1 treatment and the 20–50 cm layer in the N1P0 treatment, all fertilizers enhanced the soil Carbon management index (CMI) to varying degrees. Structural equation modeling shows that nitrogen and phosphorus indirectly affect SOC content by changing the content of the active organic carbon fraction, and that SOC is primarily impacted by POC and MBC. The comprehensive assessment indicated that the N1P2 treatment was the optimal fertilizer application pattern. In summary, the nitrogen and phosphorus treatments improved soil fertility in the 0–40 cm soil layer and soil carbon sequestration potential in the 40–60 cm soil layer of alfalfa fields. In agroecosystems, a recommended application rate of 120 kg·ha-1 for nitrogen and 100 kg·ha-1 for phosphorus is the most effective in increasing SOC content, soil carbon pool potential and alfalfa hay yield.

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“…Root metabolites contribute plant-derived carbon to the forest's soil, with the rate of root exudation varying over time, space, and across different environmental conditions (Gao et al, 2021;Keller et al, 2021;Chen et al, 2023). For instances, crucial soil parameters such as organic matter distribution, which varies with soil depth in temperate forest ecosystems, affect both root exudation and Fine root functional traits and their relationships with environmental variables, root metabolites and groups of microorganisms.…”

Section: Metabolite and Root Traits Across Soil Horizons Impact Micro...mentioning

confidence: 99%

Metabolic niches in the rhizosphere microbiome: dependence on soil horizons, root traits and climate variables in forest ecosystems

Maitra,

Hrynkiewicz,

Szuba

et al. 2024

Front. Plant Sci.

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Understanding belowground plant-microbial interactions is important for biodiversity maintenance, community assembly and ecosystem functioning of forest ecosystems. Consequently, a large number of studies were conducted on root and microbial interactions, especially in the context of precipitation and temperature gradients under global climate change scenarios. Forests ecosystems have high biodiversity of plants and associated microbes, and contribute to major primary productivity of terrestrial ecosystems. However, the impact of root metabolites/exudates and root traits on soil microbial functional groups along these climate gradients is poorly described in these forest ecosystems. The plant root system exhibits differentiated exudation profiles and considerable trait plasticity in terms of root morphological/phenotypic traits, which can cause shifts in microbial abundance and diversity. The root metabolites composed of primary and secondary metabolites and volatile organic compounds that have diverse roles in appealing to and preventing distinct microbial strains, thus benefit plant fitness and growth, and tolerance to abiotic stresses such as drought. Climatic factors significantly alter the quantity and quality of metabolites that forest trees secrete into the soil. Thus, the heterogeneities in the rhizosphere due to different climate drivers generate ecological niches for various microbial assemblages to foster beneficial rhizospheric interactions in the forest ecosystems. However, the root exudations and microbial diversity in forest trees vary across different soil layers due to alterations in root system architecture, soil moisture, temperature, and nutrient stoichiometry. Changes in root system architecture or traits, e.g. root tissue density (RTD), specific root length (SRL), and specific root area (SRA), impact the root exudation profile and amount released into the soil and thus influence the abundance and diversity of different functional guilds of microbes. Here, we review the current knowledge about root morphological and functional (root exudation) trait changes that affect microbial interactions along drought and temperature gradients. This review aims to clarify how forest trees adapt to challenging environments by leveraging their root traits to interact beneficially with microbes. Understanding these strategies is vital for comprehending plant adaptation under global climate change, with significant implications for future research in plant biodiversity conservation, particularly within forest ecosystems.

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The vertical distribution pattern of microbial- and plant-derived carbon in the rhizosphere in alpine coniferous forests

Cited by 16 publications

References 70 publications

Patterns and determinants of plant‐derived lignin phenols in coastal wetlands: Implications for organic C accumulation

Patterns and determinants of plant‐derived lignin phenols in coastal wetlands: Implications for organic C accumulation

Optimizing nitrogen and phosphorus application to improve soil organic carbon and alfalfa hay yield in alfalfa fields

Metabolic niches in the rhizosphere microbiome: dependence on soil horizons, root traits and climate variables in forest ecosystems

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