Experimental drought increased the belowground sink strength towards higher topsoil organic carbon stocks in a temperate mature forest

Geoderma, Journal Year: 2023, Volume and Issue: 431, P. 116356 - 116356

Published: Feb. 3, 2023

Reduced carbon assimilation by trees is often considered to lower the overall sink function of drought-stressed forests. However, soil organic (SOC) stocks may respond differently drought than ecosystem flux dynamics, leading imprecise predictions sequestration when one value inferred from other. As a major component matter, SOC largest actively cycling terrestrial reservoir, and thus fulfills various important services. Yet, there uncertainty about how quantity quality in temperate This study addressed depth distribution matter stability forest exposed artificial for five consecutive growing seasons below clusters mature deciduous beech (Fagus sylvatica L.) coniferous spruce (Picea abies (L.) Karst.). In addition stock determination, we measured concentrations water-extractable (WEOC), performed density fractionation, determined beta values (slopes linear regressions between δ13C log-transformed content throughout profiles). Following drought, down 30 cm increased factor 1.5 under P. while they did not change with F. sylvatica. Under both species, mineral topsoil (0–5 depth) >80 % increasing relative contribution this thin section total 5 >30 %. At 5–15 depth, decreased but abies. With free light fraction (fLF) declined marginally Results fractionation suggest Greater accumulation suggests that belowground strength forests increases, which contrasts reduced uptake drought.

Language: Английский

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Root exudates simultaneously form and disrupt soil organo-mineral associations

Communications Earth & Environment, Journal Year: 2024, Volume and Issue: 5(1)

Published: Nov. 13, 2024

Organic compounds exuded by plant roots can form organo-mineral associations through physico-chemical interactions with soil minerals but disrupt existing increasing their microbial decomposition and dissolution. The controls on these opposing processes are poorly understood, as the chemical spatial characteristics of which may explain gain or loss organic matter at root-soil interface termed rhizosphere. By pulse-labeling 13C-carbon dioxide, we found that maize root exudates increased in rhizosphere clay size fraction decreased silt fraction, was mitigated dry conditions. associated particles linked to metabolism more spatially chemically heterogeneous than non-rhizosphere particles. Our findings show simultaneously associations, mediated mineral composition, moisture. Compounds released stimulate carbon storage soils same time, according experiments plants labelled carbon-13.

Language: Английский

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Spatial distribution of fine root traits in relation to soil properties and aggregate stability of intensively managed Moso bamboo (Phyllostachys edulis) plantations in subtropical China

Plant and Soil, Journal Year: 2024, Volume and Issue: 498(1-2), P. 487 - 503

Published: Jan. 4, 2024

Language: Английский

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Miscanthus sp. root exudate alters rhizosphere microbial community to drive soil aggregation for heavy metal immobilization

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 949, P. 175009 - 175009

Published: July 23, 2024

Language: Английский

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A pulse of simulated root exudation alters the composition and temporal dynamics of microbial metabolites in its immediate vicinity

Soil Biology and Biochemistry, Journal Year: 2023, Volume and Issue: 189, P. 109259 - 109259

Published: Dec. 1, 2023

Root exudation increases the concentration of readily available carbon (C) compounds in its immediate environment. This creates 'hotspots' microbial activity characterized by accelerated soil organic matter turnover with direct implications for nutrient availability plants. However, our knowledge metabolic processes occurring vicinity roots during and after a root event is still limited. Using reverse microdialysis, we simulated releasing a13C-labelled mix low-molecular-weight C at mm-sized locations undisturbed soil. Combined stable isotope tracing, investigated fine-scale temporal spatial response metabolism, chemistry, traced respiration uptake exuded compounds. Our results show that 9-h pulse leads to i) large local ii) alteration dynamics metabolites over following 12 day spot. Notably, observed threefold increase ammonium concentrations h increased nitrate five days pulse. Moreover, various short-chain fatty acids (acetate, propionate, formate) days, indicating altered pathways activity. Phospholipid neutral lipid (PLFAs, NLFAs) all major groups were significantly 13C-enriched within 5 mm radius around microdialysis probes, but not beyond. The highest relative 13C enrichment was fungal NLFAs, significant proportion had been incorporated into storage findings indicate punctual release intact changes metabolism surroundings, enhancing mineralization native nitrogen. highlights versatility rapidly changing their effectiveness increasing near plant roots.

Language: Английский

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Contrasting stocks and origins of particulate and mineral-associated soil organic carbon in a mangrove-salt marsh ecotone

Geoderma, Journal Year: 2024, Volume and Issue: 446, P. 116904 - 116904

Published: May 7, 2024

The global warming-driven poleward expansion of mangrove habitats (e.g., Avicennia germinans and Rhizophora mangle) into temperate salt marshes Spartina alterniflora Juncus roemerianus) has been shown to alter coastal soil organic carbon (SOC) storage. However, the taxa-specific consequences this vegetation shift on origin size SOC sub-fractions (particulate OC (POC); mineral-associated (MAOC); reactive iron-associated (FeR-MAOC)) remain largely unexplored. In study, we used a particle size-based fractionation method compare quantity δ13C composition bulk each in cores collected from Apalachicola Bay barrier islands Florida, USA, highest latitude where monospecific communities all four aforementioned plants co-occur. Depth-dependent variation clearly showed replacement S. by mangroves, as well reciprocal substitutions J. roemerianus, probably driven changes wetland elevation. Higher burial rates suggested that soils were principally developed deposition. contrast, comparatively lower but higher stocks marsh illustrated subsurface input roots. POC was primarily derived contemporary plant detritus; its concentration (58.8 ± 9.0 % SOC) relative mangroves (38.4 6.0 SOC). MAOC content did not vary across (53.5 10.9 SOC), originated microbially-transformed pre-existing plants. FeR-MAOC essentially absent R. mangle (2.9 3.6 while representing minor fraction three other (7.8 7.0 more like present-day surface plants, highlighting situ formation their active oxidizing rhizospheres.

Language: Английский

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Estimating the global root exudate carbon flux

Biogeochemistry, Journal Year: 2024, Volume and Issue: 167(7), P. 895 - 908

Published: July 9, 2024

Abstract Root exudation, the export of low-molecular weight organic carbon (C) from living plant roots to soil, influences microbial activity, nutrient availability, and ecosystem feedbacks climate change, but magnitude this C flux at global scales is largely unknown. Here, we synthesize in situ measurements root exudation rates couple those estimates fine biomass estimate biome-level exudate fluxes. We a 13.4 (10.1–20.2) Pg y −1 , or about 9% (7–14%) annual gross primary productivity. did not find differences mass-specific among biomes, though total fluxes are estimated be greatest grasslands owing their high density absorptive biomass. Our synthesis highlights importance exudates terrestrial cycle identifies regions where more needed improve future

Language: Английский

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The root of plant-plant interactions: Belowground special cocktails

Current Opinion in Plant Biology, Journal Year: 2024, Volume and Issue: 80, P. 102547 - 102547

Published: May 14, 2024

Plants interact with each other via a multitude of processes among which belowground communication facilitated by specialized metabolites plays an important but overlooked role. Until now, the exact targets, modes action, and resulting phenotypes that these induce in neighboring plants have remained largely unknown. Moreover, positive interactions driven release root exudates are prevalent both natural field conditions controlled laboratory environments. In particular, intraspecific suggest genotypic recognition mechanism addition to non-self perception plant roots. This review concentrates on recent discoveries regarding how one another through signals intra- interspecific mixtures. Furthermore, we elaborate enhanced understanding can propel agroecology forward.

Language: Английский

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Soil Carbon Accumulation Under Afforestation Is Driven by Contrasting Responses of Particulate and Mineral‐Associated Organic Carbon

Global Biogeochemical Cycles, Journal Year: 2024, Volume and Issue: 38(10)

Published: Oct. 1, 2024

Abstract Afforestation is widely believed to sequester carbon (C) in soil. However, the effect of afforestation on soil organic C (SOC) accumulation still debated due contrasting features particulate and mineral‐associated (POC MAOC). We conducted a field investigation 144 paired sampling sites by comparing afforested non‐afforested lands investigate POC MAOC dynamics after across Danjiangkou basin subtropical China, where forests are dominated Platycladus orientalis , Quercus variabilis Pinus massoniana . The average contents SOC, POC, were significantly increased afforestation; however, responded differently type. All types promoted content, also showed positive responses except that with P from shrubland reduced content. With increasing SOC grew at faster rate than high levels. hindered growth while it as accrued, which potentially obscured distinct patterns triggered afforestation. variation partitioning suggests that, under afforestation, microbial traits had higher contribution both MAOM variations compared land. These results suggest robust buildup biomass plant input following could contribute promoting necromass.

Language: Английский

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Co-deploying biochar and bioenergy with carbon capture and storage improves cost-effectiveness and sustainability of China’s carbon neutrality

One Earth, Journal Year: 2025, Volume and Issue: unknown, P. 101172 - 101172

Published: Jan. 1, 2025

Language: Английский

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