Tree species traits and soil biochemical properties drive carbon stability and temperature sensitivity of soil aggregates in agroforestry systems of subtropical northeast India

Research Square (Research Square), Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 9, 2025

Agroforestry systems play a critical role in enhancing soil organic carbon (SOC) stability and mitigating climate change by integrating trees crops to improve fertility sequestration. This study investigates the SOC stability, aggregate dynamics, temperature sensitivity of mineralization across four agroforestry (Michelia oblonga, Parkia roxburghii, Alnus nepalensis, Pinus kesiya). Tree traits, properties, characteristics were analyzed alongside 60-day incubation experiment under three regimes (25°C, 30°C, 35°C). The results revealed significantly varied amongst with highest value M. oblonga (25.59 mg CO₂ g^{− 1}) lowest A. nepalensis (20.39 1). Macroaggregates consistently showed higher concentrations biochemical indicators, such as polysaccharides total glomalin-related proteins (TG-RSP), compared microaggregates bulk soil. sizes statistically influenced rates, noticeable interaction effect. rates increased temperature, but Alnus exhibited (Q₁₀ = 0.955 activation energy 24.25 kJ mol^{− 1}), highlighting its resilience thermal stress. Strong positive correlations observed between indicators SOC, TG-RSP aggregates. Temporal trends indicated that peaked at 30 days before stabilizing, reflecting decomposition labile pools. These findings highlight tree aggregates, driving retention systems.

Language: Английский

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Fertilization-induced greenhouse gas emissions partially offset carbon sequestration during afforestation

Soil Biology and Biochemistry, Journal Year: 2024, Volume and Issue: 199, P. 109577 - 109577

Published: Sept. 3, 2024

Newly-planted forests require careful management to ensure the successful establishment of young trees; this can include herbicide application, irrigation, fertilization, or a combination these treatments. The global rise in nitrogen (N) fertilizer application managed forest plantations is driven by policies aiming at rapid tree growth and carbon sequestration as strategy tackle climate change. However, impact N-fertilizer on production consumption greenhouse gases (GHG), such dioxide (CO2), nitrous oxide (N2O), methane (CH4) poorly understood, particularly when combined with irrigation. As result, assessing GHG balance key defining effective mitigation strategies through afforestation projects. This study assessed response fluxes irrigation fertilization recently afforested lowland arable land central England, across loamy sandy loam soils. 180 kg ha-1 N via an system, aimed enhancing wood C sequestration, resulted increase CO2 N2O emissions for both soil types. Particularly, emission factors (EF; N2O/kg applied) soils were 3.9% 2.1%, respectively, higher than IPCC default estimate 1% agricultural land. Furthermore, showed distinct transition from being CH4 sinks sources. Thus, had significant total Global Warming Potential (GWP), which increased 34% 32% soil, compared their controls. Despite under fertilized conditions, offset potential was only partial, highlighting net contribution emissions. outcomes emphasise "carbon-equivalent-debt" supported its early years fertilization.

Language: Английский

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Short‐Term Nitrogen and Phosphorus Additions Regulated Soil Organic Carbon Turnover by Altering Functional Microorganisms in Desert Steppes

Land Degradation and Development, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 14, 2024

ABSTRACT The dynamics of soil organic carbon (SOC) turnover are significantly modulated by the supply essential nutrients, with particular emphasis on nitrogen (N) and phosphorus (P). For typical desert steppe, responses (C) to addition N P underlying mechanism remain elusive. This study applied fertilization for 2 years probed impacts composition microbial community, as well their effects cumulative mineralization SOC ( C min ) in steppe. results showed that enhanced levels, a more pronounced increase recalcitrant pool compared labile pool. was decreased 23.2% 20.4% under additions. effect conjunction caused increases . differently influenced structure community altering preferences. markedly reduced abundance cycling genes, which encompassed those pivotal fixation, degradation, methane metabolism. alone resulted reduction mineralization, causing largest total pool, combined input P. These findings extend our understanding response enrichment. Overall, independently augments soil's capacity reservoir, thereby facilitating greater sequestration steppes.

Language: Английский

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The alterations in soil organic carbon transformation and bacterial community structure in mining areas induced by coal dust of different coalification degrees

Journal of Soils and Sediments, Journal Year: 2024, Volume and Issue: 24(7), P. 2684 - 2694

Published: June 11, 2024

Language: Английский

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Modeling adaptation strategies to climate change in prospect of agriculture

Elsevier eBooks, Journal Year: 2024, Volume and Issue: unknown, P. 283 - 305

Published: Oct. 11, 2024

Language: Английский

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