Microplastics alter soil structure and microbial community composition

Environment International, Год журнала: 2024, Номер 185, С. 108508 - 108508

Опубликована: Фев. 16, 2024

Microplastics (MPs), including conventional hard-to-biodegrade petroleum-based and faster biodegradable plant-based ones, impact soil structure microbiota in turn affecting the biodiversity functions of terrestrial ecosystems. Herein, we investigated effects MPs on aggregate distribution microbial community composition microhabitats at scale. Two MP types (polyethylene (PE) polylactic acid (PLA) with increasing size (50, 150, 300 μm)) were mixed a silty loam (0–20 cm) ratio 0.5 % (w/w) rice–wheat rotation system greenhouse under 25 °C for one year. The aggregation, bacterial communities their co-occurrence networks as function size. Conventional generally had similar aggregation communities. They increased proportion microaggregates from 17 to 32 while reducing macroaggregates 84 68 %. stability decreased 1.4 mm 1.0–1.1 independently due decline binding agents (e.g., byproducts proteinaceous substances). type amount strongly affected structure, accounting approximately 54 variance. Due less bioavailable organics, within was more sensitive addition. Co-occurrence network analysis revealed that exacerbated competition among bacteria complexity networks. Such stronger PE than PLA higher persistence soils. Proteobacteria, Bacteroidetes, Chloroflexi, Actinobacteria, Gemmatimonadetes keystone taxa macroaggregates, Actinobacteria Chloroflexi microaggregates. most Overall, both reduced portion large stable aggregates, altering structures taxa.

Язык: Английский

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Soil labile organic carbon fractions mediate microbial community assembly processes during long‐term vegetation succession in a semiarid region

iMeta, Год журнала: 2023, Номер 2(4)

Опубликована: Окт. 22, 2023

Conceptual diagram for the labile organic carbon (OC) fractions mediating microbial assembly processes during long-term vegetation succession. Owing to its sparse and low soil (SOC) content, Loess Plateau is one of regions with highest (C) sequestration potential [1]. Vegetation succession a widely adopted strategy ecosystem recovery capacity rehabilitate degraded lands facilitate matter in semiarid region [2-5]. Additionally, it can influence underground community dynamics [6, 7]. The Ziwuling has undergone approximately 160 years secondary succession, making unique area complete sequence natural following farmland abandonment on [4]. Thus, this provide us better understanding patterns changes (Figure 1A Supporting Information: Table S1). Considering vital role microorganisms function, examining temporal communities crucial [8]. composition are essential function [9, 10]. Deterministic stochastic two primary ecological involved [11]. Traditionally, been regarded as being primarily influenced by deterministic processes, aligning principle that, "everything everywhere, but environment selects" [12]. Nevertheless, should not be disregarded when considering random extinctions or dispersal events [13]. Land use type also notable effect [14-16]. Stochastic have greater agricultural fields, whereas their impact diminishes forested soils, bacterial temperate grasslands [16]. Furthermore, there environmental differences between topsoil (0–20 cm) subsoil (20–40 terrestrial ecosystems [17]. Previous studies indicated that dominate assembly, drift prevailing limitation playing dominant subtropical paddy soils [18]. This indicates associations characteristics different spatial distributions, which may affect function. Although extensive research conducted process [12, 19, 20], uncertainties about remain owing resource balance strongly abiotic factors including nitrogen [19, 21, 22]. Research salt marsh plant shown fluctuations SOC exert strongest selective pressure assemblies [23]. Among eight indicators, had greatest [24]. commonly conceptualized stable C fraction storage models [25], easily oxidizable (EOC), particulate (POC), dissolved considered OC serve early indicators variation [26, 27]. In contrast, recalcitrant (ROC) mineral-associated highly [28]. functional diversity SOC, many these predominantly focused association 29, 30], leaving relationship relatively unclear. Within framework biotic cannot overlooked, could determine attributes niche occupancy 31]. Keystone taxa connected taxonomic groups play roles functionality [32]. For example, Sulfuricella, Rhodobacter, Comamonadaceae, drive mediated graphene derivatives [33]. However, keystone largely unknown ecosystems, enhancing comprehending functionality. To address issues, were selected progression explore structure, co-occurrence networks, relationships fractions. We hypothesized that: (1) stronger than because nutrient limitations, (2) given represents readily usable energy source microorganisms, likely mainly governed Long-term significantly increased accumulation 0–40 cm from pioneer weed stage onwards (p < 0.001; Figure 1B). content was higher all stages After shrubland stage, compared When reached forest (>110 years), gradually stabilized Succession age depth affected comprised phyla Proteobacteria, Actinobacteria, Acidobacteria, Gemmatimonadota, Chloroflexi 1C). Basidiomycota, Ascomycota, Mortierellomycota, Glomeromycota, Kixellomycota fungal abundances Actinobacterta, Mortierellomycota subsoil, those Chloroflexi, Ascomycota lower 0.05; relative Overall, decreased alpha communities, Chao 1 Shannon indices (Supporting S2). A combination NMDS analysis, ANOSIM, Adonis statistical tests varied 1D). Soil Tables S2 S3). along across depths investigated using null model analyses. results showed (|βNTI| > 2), especially homogeneous selection, critical bacteria fungi at both 2A–D). weaker subsoil. (homogeneous selection) later 2A,C). Drift limitations 2B,D). networks distinct each 2E–H). Edges average degree depth, demonstrating network more complex (Table S4). positive correlations cross-kingdom further explored S3), found nodes edges among climax forests S4), suggesting complexity networks. Network analysis identified genus Dongia (ASV901) amplicon variant (ASV) bacteria, genera MND1 (ASV155) MB-A2-108 (ASV266) 2E,F S5). ASVs included (ASV4), family Pezizaceae (ASV45), Fusarium (ASV136), class Sordarioclamycetes (ASV689) 2G Alternaria (ASV44), (ASV70), Filobasidium (ASV374), order Chaetothyriales (ASV250) 2H abundance negatively correlated 3A). It worth noting ASV901 correlation taxon–environment community. consisted 60 230 3B), while 44 104 3B). EOC (connection number: 42) most important closely associated EOC, POC, ROC (with connection numbers 20, respectively) linear regression reflected variations bacteria. providing suitable explanation Figures S5 S6). These demonstrated effectively explained OC. Therefore, used mediators illustrate impacts partial least squares path (PLS-PM) 3C–F). main drivers regulated affecting traits total (0.51) S7A), (−0.56) S7C). Bacterial impacted 3D,F S12). effects (0.73) (−0.97) respectively S7B,D). Microbial various life strategies generate responses, [34]. Based mineralization growth rates, classified into r- (copiotrophic, fast-growing) K-strategists (oligotrophic, slow-growing) [35]. study, shifted S8), agreement previous [36, 37]. increase ratio extracellular enzyme activity corroborates result S9 S10). produce enzymes degrade [38-40]. An unstable conducive rapid r-strategists [40], driven [39]. species reduce availability [41]. indicate community, shifts K-strategists, strengthens stability. resources, resulting ASV [42, 43]. Ecological comprising ratios negative due interactions decreasing oscillations disturbed [44, 45]. stability fungi. modularity revealed limiting losing [46]. 2E,H suggests depths. fewer perturbations maintain number nodes, edges, correlations, indicating tended stabilize stage. other generally pools [47]. Consequently, factor communities. suggest increases Clarifying [48]. dominated 2A−D). niche-based theory states structure [14]. Stronger extreme, low-resource general phenomenon [13], explains (lower βNTI) supports first hypothesis. Homogeneous selection usually determined similar conditions exerted significant forces, less expected happen chance [49]. despite still dominating consistent current views, advancement supply under weak Extreme pH acts strict filter phylogenetic clustering, regardless successional age, [50, 51]. we difference small S11), thought caused slow shift processes. importance suddenly 2A,B), related nutrients such PLS-PM driving mechanisms 3C–F S7), confirmed second an applied affects [26]. controlling they [42]. study suggested paramount increase, diminishes. βNTI supported observation pathogenic rhizosphere, decrease benefits maintenance rhizosphere [52, 53]. recognized beneficial bacterium aid pathogen resistance, Xanthomonadaceae, ensure healthy [54]. assembly. Interactions common facilitating 55]. 3C–F), conclusion attributed Some volatiles released antagonistic [56], decomposition [57]. summary, OC, regulating thereby process. illustrated fractions, Given key rather sequences. neutral hypothesis [23], highlighting non-negligible determining directly tested laboratory, so validation through controlled experiments required confirm relationship. new targeted therapy indicator microenvironment. examined cultured metagenomic metatranscriptomic approaches future studies. show drove taxa. addition, Taken together, provides insights link over long scales. Jingwei Shi Lin Yang conceived supervised study. Jiwei Li established experimental sites. Liao collected samples analyzed data. Shuo Jiao, Zhouping Shangguan, Lei Deng assisted data analysis. wrote manuscript input authors. National Natural Science Foundation China (42277471, 42307578, U2243225), Key Development Program Shaanxi Province (2021ZDLSF05-02), Funding Top Young Talents Ten Thousand Plan (2021) Forestry Grassland Administration (2020132601). authors declare no conflict interest. support findings available corresponding author upon reasonable request. DNA sequences generated Center Biotechnology Information's Gen-Bank database project accession PRJNA1022789 PRJNA1023009. scripts saved GitHub https://github.com/Shijingweisjw/iMETA-R-code. Materials (figures, tables, scripts, graphical abstract, slides, videos, Chinese translated version, updated materials) online DOI iMeta http://www.imeta.science/ Please note: publisher responsible any supporting information supplied Any queries (other missing content) directed article.

Язык: Английский

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Effects of vegetation restoration on soil aggregates, organic carbon, and nitrogen in the Loess Plateau of China

CATENA, Год журнала: 2023, Номер 231, С. 107340 - 107340

Опубликована: Июнь 26, 2023

Язык: Английский

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Recalcitrant organic carbon plays a key role in soil carbon sequestration along a long-term vegetation succession on the Loess Plateau

CATENA, Год журнала: 2023, Номер 233, С. 107528 - 107528

Опубликована: Сен. 18, 2023

Язык: Английский

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Deciphering microbial drivers of soil organic matter mineralization in surface and subsurface soil during long-term vegetation succession

Agriculture Ecosystems & Environment, Год журнала: 2024, Номер 374, С. 109186 - 109186

Опубликована: Июль 21, 2024

Язык: Английский

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Soil Organic Carbon Increases With Decreasing Microbial Carbon Use Efficiency During Vegetation Restoration

Global Change Biology, Год журнала: 2024, Номер 30(12)

Опубликована: Дек. 1, 2024

ABSTRACT Microbial carbon (C) use efficiency (CUE) describes the proportion of organic C used by microorganisms for anabolic processes, which increases with soil (SOC) content on a global scale. However, it is unclear whether similar relationship exists during natural vegetation restoration in terrestrial ecosystems. Here, we investigated patterns CUE along 160‐year chronosequence (from farmland to climax forest) estimated stoichiometric modeling; additionally, examined between and SOC combined these results meta‐analysis. The combination indicated that decreased from 0.35 0.28. Surprisingly, increased decreasing because forest soils have low pH values high microbial phosphorus limitations compared early ecosystems, implying forests may not sequester as much expected. shift was most important predictor climate, plant, factors. changes were directly induced pH‐induced community. Alkaline acidification tended decrease CUE. This first large‐scale estimate highlights need strengthen sink management mature sustain their sequestration potential.

Язык: Английский

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Soil minerals regulate soil organic carbon accumulation through glomalin-related soil protein along an elevation gradient in a mountain arid ecosystem

Environmental Research, Год журнала: 2025, Номер 270, С. 121041 - 121041

Опубликована: Фев. 4, 2025

Язык: Английский

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Forest restoration rehabilitates soil multifunctionality in riparian zones of sugarcane production landscapes

The Science of The Total Environment, Год журнала: 2023, Номер 888, С. 164175 - 164175

Опубликована: Май 16, 2023

Язык: Английский

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Variation in dissolved organic matter characteristics of soil aggregates in slip deposition zone with natural succession on a semiarid region

Journal of Environmental Management, Год журнала: 2025, Номер 380, С. 125040 - 125040

Опубликована: Март 23, 2025

Язык: Английский

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Dynamics of litter decomposition rate and soil organic carbon sequestration following vegetation succession on the Loess Plateau, China

CATENA, Год журнала: 2023, Номер 229, С. 107225 - 107225

Опубликована: Май 17, 2023

Язык: Английский

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