Local temperature increases reduce soil microbial residues and carbon stocks

Global Change Biology, Journal Year: 2022, Volume and Issue: 28(21), P. 6433 - 6445

Published: July 27, 2022

Warming is known to reduce soil carbon (C) stocks by promoting microbial respiration, which associated with the decomposition of residue (MRC). However, relative contribution MRC organic (SOC) across temperature gradients poorly understood. Here, we investigated SOC along two independent elevation our model system (i.e., Tibetan Plateau and Shennongjia Mountain in China). Our results showed that local increases were negatively correlated SOC. Further analyses revealed rising reduced via decreasing MRC, helps explain future reductions under climate warming. findings demonstrate warming has potential C sequestration increasing exacerbating positive feedback between CO2 efflux. study also considered influence multiple environmental factors such as pH moisture, more important controlling than traits life-style strategies metabolic efficiency. Together, work suggests an mechanism underlying long-term sequestration, implications for microbial-mediated process face global change.

Language: Английский

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Tracking microplastics biodegradation through CO2 emission: Role of photoaging and mineral addition

Journal of Hazardous Materials, Journal Year: 2022, Volume and Issue: 439, P. 129615 - 129615

Published: July 15, 2022

Language: Английский

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Effects of Nitrogen and Phosphorus Addition on Soil Extracellular Enzyme Activity and Stoichiometry in Chinese Fir (Cunninghamia lanceolata) Forests

Frontiers in Plant Science, Journal Year: 2022, Volume and Issue: 13

Published: March 9, 2022

Soil extracellular enzymes play an important role in microbial functions and soil nutrient cycling the context of increasing N deposition globally. This is particularly for Chinese fir (Cunninghamia lanceolata) forests because decline fertility induced by successive rotation. In this study, we aimed to determine effects simulated (N30: 30 kg ha-2 year-1; N60: 60 year-1) phosphorus addition (P20: 20 mg kg-1; P40: 40 kg-1) on activity stoichiometry related C, N, P fir. The results showed that alone increased β-1,4 glucosidase (BG) but decreased N-acetyl-β-d-glucosidase (NAG) leucine aminopeptidase (LAP). ratios enzymes, C:N C:P, alleviated N-limitation, aggravated C-limitation. enzyme activity, P40 ratio BG biomass carbon (MBC), (NAG + LAP):MBC ratio, thereby aggravating C restriction. co-addition significantly affected stoichiometry. For instance, BG:MBC under N30 treatment, which intensified pH was main factor influencing these variables were positively correlated. stoichiometric relationships reactions coupled with pH, total nitrogen (TN), available (AP). Our indicate changes characteristics inputs influence activities microorganisms result resource acquisition strategies. study provides useful insights into development management strategies improve productivity scenarios deposition.

Language: Английский

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Lithologic control of microbial-derived carbon in forest soils

Soil Biology and Biochemistry, Journal Year: 2022, Volume and Issue: 167, P. 108600 - 108600

Published: Feb. 10, 2022

Language: Английский

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ddPCR surpasses classical qPCR technology in quantitating bacteria and fungi in the environment

Molecular Ecology Resources, Journal Year: 2022, Volume and Issue: 22(7), P. 2587 - 2598

Published: May 19, 2022

Quantitative real-time PCR (qPCR) has been widely used in quantifying bacterial and fungal populations various ecosystems, as well the fungi to bacteria ratio (F:B ratio). Recently, researchers have begun apply droplet digital (ddPCR) this area; however, no study systematically compared qPCR ddPCR for quantitating both environmental samples at same time. Here, we designed probe-primer pair combinations targeting 16S rRNA gene internal transcribed spacer (ITS) detection of fungi, respectively, tested SYBR Green TaqMan approaches methods mock communities real samples. In communities, quantification results were significantly closer expected values (p < .05), had smaller coefficients variations .05) than qPCR, suggesting was more accurate repeatable. samples, consistently quantified ITS concentrations all four habitats without abnormal overestimation or underestimation, F:B obtained by consistent with phospholipid fatty acid analysis. Our indicated that better precision, repeatability, sensitivity, stability quantitation qPCR. Although high cost, complicated processes restricted range, it shows insensitivity inhibitors potential long target fragments. We expect ddPCR, which is complementary will contribute microbial monitoring evaluation.

Language: Английский

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Climate warming alters the relative importance of plant root and microbial community in regulating the accumulation of soil microbial necromass carbon in a Tibetan alpine meadow

Global Change Biology, Journal Year: 2023, Volume and Issue: 29(11), P. 3193 - 3204

Published: March 2, 2023

Climate warming is predicted to considerably affect variations in soil organic carbon (SOC), especially alpine ecosystems. Microbial necromass (MNC) an important contributor stable pools. However, accumulation and persistence of MNC across a gradient are still poorly understood. An 8-year field experiment with four levels was conducted Tibetan meadow. We found that low-level (+0-1.5°C) mostly enhanced bacterial (BNC), fungal (FNC), total compared control treatment layers, while no significant effect caused between high-level (+1.5-2.5°C) treatments treatments. The contributions both BNC were not significantly affected by depths. Structural equation modeling analysis demonstrated the plant root traits on strengthened intensity, influence microbial community characteristics waned along warming. Overall, our study provides novel evidence major determinants production stabilization may vary magnitude meadows. This finding critical for updating knowledge storage response climate

Language: Английский

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Nutrient availability and stoichiometry mediate microbial effects on soil carbon sequestration in tropical forests

Soil Biology and Biochemistry, Journal Year: 2023, Volume and Issue: 186, P. 109186 - 109186

Published: Sept. 29, 2023

Language: Английский

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Decadal application of mineral fertilizers alters the molecular composition and origins of organic matter in particulate and mineral-associated fractions

Soil Biology and Biochemistry, Journal Year: 2023, Volume and Issue: 182, P. 109042 - 109042

Published: May 9, 2023

Language: Английский

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Phosphorus supply suppressed microbial necromass but stimulated plant lignin phenols accumulation in soils of alpine grassland on the Tibetan Plateau

Geoderma, Journal Year: 2023, Volume and Issue: 431, P. 116376 - 116376

Published: Feb. 8, 2023

Increased nitrogen (N) and phosphorus (P) inputs have fundamental effects on the soil organic carbon (SOC) composition dynamics. However, responses of plant- microbial-derived SOC components to N P addition in alpine grasslands are poorly understood. Based a 10-year experiment conducted grassland Tibetan Plateau, we used amino sugars lignin phenols as tracers for microbial necromass plant components, respectively, explored their accumulation with P. We found that + (P supply) decreased necromass, whereas did not significant effect. In comparison, supply increased topsoil, but them subsoil. Among these factors, total played non-negligible role controlling soils. addition, ratios fungi-to-bacteria were observed supply. This implies although change significantly, it may eventually loss potential. Collectively, attempted elucidate underlying mechanisms long-term sequestration, which has important implications microbial-mediated processes context increasing inputs.

Language: Английский

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Long-term rice cultivation increases contributions of plant and microbial-derived carbon to soil organic carbon in saline-sodic soils

The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 904, P. 166713 - 166713

Published: Aug. 31, 2023

Language: Английский

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