Soil Moisture Threshold of Methane Uptake in Alpine Grassland Ecosystems

Global Change Biology, Год журнала: 2025, Номер 31(2)

Опубликована: Фев. 1, 2025

ABSTRACT Methane (CH 4 ) uptake in alpine ecosystems is an important component of the global CH sink. However, large uncertainties remain regarding magnitude and spatial patterns uptake, owing to its extensive variability, diverse controlling factors, limited regional‐scale observations. Here, we investigated field ecosystem along a 3200‐km transect across various grasslands on Qinghai–Tibetan Plateau (QTP). We found substantial variation situ among grasslands, with highest rates drier regions mid‐western QTP. Soil moisture was most factor exhibiting remarkably low threshold 6.2 ± 0.1 v/v %. Below this threshold, constrained by soil moisture, moisture‐induced nitrogen limitation, high temperatures. Above mainly gas diffusion By integrating grid predictors random forest model trained 1851 measurements encompassing both our observations regional synthesis QTP, estimated 0.88 0.020 Tg year −1 from all This higher estimate, primarily driven steppes, significantly greater than current estimates models. Our findings highlight importance sink dry characterized suggesting that contribution drylands may have been substantially underestimated budget.

Язык: Английский

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Rodent-induced grassland degradation increases annual non-CO2 greenhouse gas fluxes and NO losses despite CH4 uptake enhancement

Agricultural and Forest Meteorology, Год журнала: 2025, Номер 368, С. 110534 - 110534

Опубликована: Апрель 7, 2025

Язык: Английский

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Plateau Pika Disturbance Changes Soil Bacterial Functions and Exoenzyme Abundance to Modulate the C Cycle Pathway in Alpine Grasslands

International Journal of Molecular Sciences, Год журнала: 2024, Номер 25(23), С. 12775 - 12775

Опубликована: Ноя. 28, 2024

Plateau pika (Ochotona curzoniae) is crucial to soil organic carbon (SOC) storage in the Qinghai–Tibetan plateau (QTP), but its role bacterial SOC metabolisms across different degraded alpine grasslands remains unclear. In this study, we investigated physicochemical properties and composition function of communities control pika-disturbed experiencing degradation levels (undegraded, UDM; lightly, LDM; moderately, MDM severely, SDM). The results demonstrate that (i) primary phyla include Proteobacteria, Acidobacteriota, Actinobacteriota, Bacteroidota Verrucomicrobiota. Soil significantly impact determine influence disturbance. Pika disturbance increases OTUs by 7.5% LDP (p > 0.05) 50.5% MDP < 0.05), while decreases 21.4% SDP 0.05). (ii) downregulates exoenzyme abundance associated with simple complex matter decomposition 9.5% 13.9% LDP, 29.4% 26.3% upregulates these exoenzymes 23.6% 37.9% These changes correspond increase TC declines SDP. (iii) can enhance accumulation through upregulating C cycle pathway ethanol production MDP. However, it pyruvate CO2 conversion SDP, leading negative on storage.

Язык: Английский

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A comprehensive review on solid waste management in Morocco: assessment, challenges and potential transition to a circular economy

Euro-Mediterranean Journal for Environmental Integration, Год журнала: 2024, Номер unknown

Опубликована: Окт. 17, 2024

Язык: Английский

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