Peat loss collocates with a threshold in plant–mycorrhizal associations in drained peatlands encroached by trees

New Phytologist, Journal Year: 2023, Volume and Issue: 240(1), P. 412 - 425

Published: May 6, 2023

Summary Drainage‐induced encroachment by trees may have major effects on the carbon balance of northern peatlands, and responses microbial communities are likely to play a central mechanistic role. We profiled soil fungal community estimated its genetic potential for decay lignin phenolics (class II peroxidase potential) along peatland drainage gradients stretching from interior locations (undrained, open) ditched (drained, forested). Mycorrhizal fungi dominated across gradients. When moving towards ditches, dominant type mycorrhizal association abruptly shifted ericoid mycorrhiza ectomycorrhiza at c. 120 m ditches. This distance corresponded with increased peat loss, which more than half be attributed oxidation. The ectomycorrhizal genus Cortinarius drained end relatively higher produce class peroxidases (together Mycena ) was positively associated humification negatively carbon‐to‐nitrogen ratio. Our study is consistent plant–soil feedback mechanism, driven shift in vegetation, that potentially mediates changes aerobic decomposition during postdrainage succession. Such long‐term legacy upon restoration efforts implication tree onto carbon‐rich soils globally.

Language: Английский

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Forest swamp succession alters organic carbon composition and survival strategies of soil microbial communities

The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 904, P. 166742 - 166742

Published: Sept. 1, 2023

Language: Английский

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Management and liming-induced changes in organo-Al/Fe complexes and amorphous mineral-associated organic carbon: Implications for carbon sequestration in volcanic soils

Soil and Tillage Research, Journal Year: 2024, Volume and Issue: 242, P. 106133 - 106133

Published: May 2, 2024

Language: Английский

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Regulation Mechanisms of CO₂ Fluxes in Subtropical Mountain Peatlands Based on Long‐Term In Situ Observations at the Dajiuhu Peatland

Journal of Geophysical Research Biogeosciences, Journal Year: 2025, Volume and Issue: 130(1)

Published: Jan. 1, 2025

Abstract The Dajiuhu peatland in Shennongjia, China, is a highly representative subalpine peatland, emblematic of subtropical mountainous peatlands. Due to the lack long‐term situ continuous observations and in‐depth studies on CO 2 absorption emission patterns, regulation mechanisms flux peatlands remain unclear. Since July 2015, we have conducted over five years fluxes major environmental factors ecosystem. We calculated annual average net ecosystem carbon exchange (NEE) decomposed NEE into gross primary productivity (GPP) respiration (Reco), thus examining ecosystem's separately. results indicate that from 2016 2020 was −283.6 g C m −2 yr −1 , reflecting strong sink. Our study indicates peatland. Temperature most direct factor affecting emission, serving as important driver short time scales. Precipitation only affects but has significant impact NEE, being key maintaining peatland's sink function. Variations precipitation also led differences between years. illustrate an role sub‐tropical mountain mitigating greenhouse effect moisture conditions crucial for protecting its ecological functions.

Language: Английский

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Climate and pedogenesis exert divergent controls on dissolved organic matter during long-term ecosystem development

CATENA, Journal Year: 2025, Volume and Issue: 254, P. 109004 - 109004

Published: April 5, 2025

Language: Английский

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Variations in the quantity and chemical composition of soil dissolved organic matter along a chronosequence of wolfberry plantations in an arid area of Northwest China

Chemical and Biological Technologies in Agriculture, Journal Year: 2024, Volume and Issue: 11(1)

Published: March 18, 2024

Abstract Background Dissolved organic matter (DOM) is the most active component of soil (SOM), playing a major role in regulating fertility and carbon cycling. However, effects different wolfberry ( Lycium barbarum L. ) planting ages on chemical diversity DOM its interaction with physicochemical properties have not been comprehensively studied. In this context, we collected samples (0–10 cm) from orchards at (1, 4, 6, 10, 13 years) corn field (0 arid region Northwest Ningxia China to assess changes quantity quality using ultraviolet–visible absorbance, fluorescence spectroscopy, parallel factor analysis. Results We found that plantation changed contents nutrients SOM. addition, significantly higher concentrations were observed 10 years than those control group by 176.6 190.2%, respectively. The specific ultraviolet absorbance 254 nm (SUVA 365 ratio (E2/E3) values decreased increased, respectively, after planting, indicating low aromatic molecular weight compounds DOM. biogenic index (BIX) (FI) ranged 0.6 0.7 1.42 1.93, suggesting combination allochthonous autochthonous sources. short- long-term cultivations 1 4 increased humification degrees DOM, contribution rate protein-like (C1) intensity decreased, while fulvic acid-like (C3) increasing age, change structure acids. study, total nitrogen (TN) exchangeable Ca 2+ main factors affecting ages. Conclusions This study demonstrated enhances accumulation more complex compounds, thereby promoting sequestration under land-use types terrestrial ecosystems. Graphical

Language: Английский

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Evolving characteristics of dissolved organic matter in soil profiles during 56 years of revegetation in Mu Us Sandy Land

Plant and Soil, Journal Year: 2023, Volume and Issue: 497(1-2), P. 567 - 584

Published: Dec. 1, 2023

Language: Английский

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Effect of experimental warming on dissolved organic matter and bacterial diversity in a forest swamp soil

Ecological Indicators, Journal Year: 2023, Volume and Issue: 158, P. 111375 - 111375

Published: Dec. 7, 2023

Forest swamp ecosystems play an important role in the global carbon cycle, yet they are often overlooked. With climate warming, it is inevitable that will impact relationship between soil microorganisms and organic matter. Dissolved matter (DOM) environment extremely sensitive to environmental changes. Understanding effects of change on DOM crucial for assessing stability (C) forest soils. Therefore, we conducted a 142-day laboratory warming incubation experiment (control: 10 °C, warming: 20 °C) investigate response microbial properties warming. Excitation-emission matrix (EEM) fluorescence spectroscopy was used explore changes different material compositions over time at temperatures, high-throughput sequencing bacteria. The content (dissolved C, DOC) degree humification index (HIX) increased with increase under conditions (p < 0.05). In contrast, humic substances (C3) decreased increasing time. Long-term has separated bacterial communities gradually tightened connectivity networks. (Mantel test r = 0.58, p 0.01) DOC (r 0.21, 0.05) were most critical indicators changed diversity community. Our findings suggest interaction conditions. results this study contribute our understanding indices soils influence their associated mechanisms.

Language: Английский

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Litter and soil properties under woody and non-woody vegetation types: Implication for ecosystem management in a mountainous semi-arid landscape

Journal of Environmental Management, Journal Year: 2023, Volume and Issue: 348, P. 119238 - 119238

Published: Oct. 10, 2023

Language: Английский

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Characteristics of Soil DOM and Its Effect on the Transformation of Potentially Toxic Elements (PTE) Forms under Organic Fertilizer Return Conditions

Agronomy, Journal Year: 2023, Volume and Issue: 13(3), P. 630 - 630

Published: Feb. 22, 2023

In order to explore the effects of composition and structure soil’s dissolved organic matter (DOM) its electron transfer capacity (ETC) on bioavailability potential toxic elements chromium (Cr), lead (Pb) cadmium (Cd) after application decomposed pig manure fertilizer, three-dimensional fluorescence spectroscopy (3D-EEMs), parallel factor analysis (PARAFAC) electrochemical methods were used analyze characteristics DOM in soil solution changes ETC, dynamic relationship between relative content DOM, ETC various forms was explored by means a Pearson correlation redundancy (RDA). Among them, Cr, Pb Cd with significant biological toxicity farmland soil. The results indicated following: (1) before returning fertilizer field contained four components: UV UVA humic-like (C1), tryptophan-like (C2), Exogenous visible (C3) tyrosine-like (C4). Humus-like main component. (2) After applying contents humus components increased 8% 8.73%, respectively. this process, electron-accepting (EAC) electron-donating (EDC) 39.98% 27.91%, (3) fraction showed highly positive (p < 0.01), negative 0.05). (4) humus-like substance positively correlated total amount, reducible state oxidizable negatively weak acid extracted residue state; that more helpful for transformation state, interaction Cd. summary, reasonable could improve soil, inhibit provide theoretical basis safe use fertilizer.

Language: Английский

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