Pedobiologia最新文献_第2页

Within-field flower strips effect on Collembola assemblages over time 田间花带对弹线虫群落的影响

IF 2.2 3区农林科学 Q3 ECOLOGY

Pedobiologia

Pub Date : 2025-12-12 DOI: 10.1016/j.pedobi.2025.151109

Sékou F.M. Coulibaly , Juliette Chassain , Laure Vieublé-Gonod , Maxime Artru , Olivier De Carville , Swann Felin , Antoine Gardarin , Sophie Joimel

For several decades, techniques aimed at maximizing agricultural production have been developing rapidly. This has led to an intensification of cultural practices and concerns regarding the conservation of soil biodiversity and ecological functions and services it supports. A major challenge of agroecology is to define new methods for managing agroecosystems that enable a sustainable soil use and the preservation of its biodiversity. Sowing flower strips is often promoted in agri-environmental schemes, but their effect on soil biodiversity has yet been poorly considered. In this study, we followed the Collembola assemblages in response to the establishment of perennial wild flower strips within eight arable fields over four years (2018–2022). Collembola were sampled in the fields before the installation of the flower strips, in 2018 (y + 0), and in 2019 (y + 1), 2021 (y + 3) and 2022 (y + 4). Soil samples were taken within, at 5 m and at 30 m from the flower strips. Our results showed that there were no significant differences between the collembolan assemblages depending on the sampling distances from the flower strips. However, the age of the flower strips had an effect on Collembola assemblages, with y + 1 showing the lowest Collembola density and diversity. The differentiation between Collembola assemblages occurred three years after the flower strips sowing and was maintained for up to four years. Collembola appear to respond to environmental changes caused by flower strips sowing, since response traits such as sensory organs, pigmentation and sexual reproduction were the most dominant.

几十年来，旨在实现农业生产最大化的技术得到了迅速发展。这导致在保护土壤生物多样性及其所支持的生态功能和服务方面的文化做法和关注的加强。农业生态学的一个主要挑战是确定管理农业生态系统的新方法，使土壤能够可持续利用并保护其生物多样性。在农业环境计划中经常提倡播花条，但其对土壤生物多样性的影响尚未得到充分考虑。在本研究中，我们在4年（2018-2022年）的时间里，对8块耕地内多年生野花带的建立对线虫群落的响应进行了跟踪研究。在安装花条之前，分别于2018年（y + 0）、2019年（y + 1）、2021年（y + 3）和2022年（y + 4）在田间取样线虫。在距离花条5 m和30 m处采集土壤样本。结果表明，不同的花带取样距离对花带组合的影响不显著。而花龄对线虫种群数量有影响，y + 1线虫密度和多样性最低。花条播种后3年，弹珠菌群分化发生，并维持4年之久。弹线虫对花条播种引起的环境变化有明显的响应，感觉器官、色素沉着和有性生殖等响应性状占主导地位。

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引用次数: 0

Global synthesis reveals that climate and soil substrate shape microbial necromass carbon in forest soils 全球综合揭示了气候和土壤基质对森林土壤微生物坏死体碳的影响

IF 2.2 3区农林科学 Q3 ECOLOGY

Pedobiologia

Pub Date : 2025-12-01 DOI: 10.1016/j.pedobi.2025.151099

Shijia Wang, Xia Peng, Jian Su, Lihua Tu

A clear understanding of microbial necromass carbon (MRC) accumulation mechanisms is essential for evaluating stable carbon budgets and informing effective strategies to enhance permanent carbon storage on a global forest scale. However, the complexity and heterogeneity inherent in forest systems have left the distribution of MRC at finer forest-type classification scales, and its driving factors still need to be solved. Thus, this study synthesized a dataset of 1220 data points from 88 peer-reviewed papers on global forests to investigate the distribution and mechanisms of MRC across diverse climate zones, forest types, elevation gradients, and soil depths. The analysis showed that temperate regions, with lower mean annual temperature and precipitation, had the highest MRC contents (21.88 g kg⁻¹), especially in mixed forests. MRC accumulation was further favored by low- to mid-elevations, Alfisols, and surface soil layers. Climate factors exerted both direct positive effects on MRC and indirect influences through microbial community structure and soil substrate properties. Overall, this global synthesis enhances our understanding of the environmental mechanisms governing MRC and its contribution to stable soil carbon storage in forests.

明确微生物坏死体碳（MRC）积累机制对于评估稳定的碳预算和提供有效的策略以提高全球森林规模的永久碳储量至关重要。然而，森林系统固有的复杂性和异质性使得MRC的分布在更精细的森林类型分类尺度上，其驱动因素仍有待解决。因此，本研究综合了来自88篇全球森林同行评议论文的1220个数据点数据集，探讨了不同气候带、森林类型、高程梯度和土壤深度的MRC分布及其机制。分析表明，年平均气温和降水量较低的温带地区，尤其是混交林，其MRC含量最高（21.88 g kg⁻¹）。中低海拔、土层和表层更有利于MRC的积累。气候因子通过微生物群落结构和土壤基质特性对土壤MRC既有直接的正向影响，也有间接的影响。总的来说，这一全球综合增强了我们对控制MRC的环境机制及其对森林土壤碳稳定储存的贡献的理解。

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引用次数: 0

Putting the “Ped” into Pedobiologia –– A call to a new generation of soil ecologists 把“Ped”放入土壤生物学——对新一代土壤生态学家的呼唤

IF 2.2 3区农林科学 Q3 ECOLOGY

Pedobiologia

Pub Date : 2025-12-01 DOI: 10.1016/j.pedobi.2025.151091

Dave Coleman, Zoë Lindo

引用次数: 0

Determinants of rhizosphere community structure: The role of root traits and soil properties in coniferous plantations 根际群落结构的决定因素：针叶林根系性状和土壤性质的作用

IF 2.2 3区农林科学 Q3 ECOLOGY

Pedobiologia

Pub Date : 2025-12-01 DOI: 10.1016/j.pedobi.2025.151100

Yudai Kitagami , Naoki Makita

Roots serve as essential linkages between aboveground and belowground communities and play a key role in maintaining multiple ecosystem functions. Soil communities consist of plant roots and their associated mycorrhizal fungi, microorganisms such as bacteria and fungi, and fauna across a wide range of sizes and trophic groups, all interconnected within complex food webs. However, our understanding of how tree root systems mediate the composition and diversity of soil biota remains limited. This study aimed to determine the effects of the root systems of four coniferous tree species and the soil properties they mediate on soil bacterial, fungal, and nematode communities. We collected soil and root samples from monocultural coniferous stands; Pinus densiflora (Pine), Larix kaempferi (Larch), Chamaecyparis obtusa (Cypress), and Cryptomeria japonica (Cedar) in temperate forests of Japan. Bacterial and fungal communities were assessed using MiSeq high-throughput sequencing system, while nematodes were morphologically identified at the genus/family level and examined for both community structure and trophic composition. Our results showed that fungal and nematode abundances were significantly or marginally higher in pine soils, respectively. There were no significant differences in the abundance of bacteria among the four tree species. Fungal richness was significantly higher in cypress stands, while nematode richness was greater in cedar stands. Fungal richness was strongly influenced by root traits, whereas nematode richness was primarily explained by soil properties. There were no significant differences in the richness of bacteria among four tree species. Community structures of bacterial, fungal, and nematode varied significantly among the four tree species. Moreover, soil properties significantly influenced the community structures of all three-soil biota, whereas root-traits did not influence the community structures. These findings suggest that unique soil biological communities are shaped by the soil environment those root systems modify.

根系是连接地上和地下群落的重要纽带，在维持多种生态系统功能方面发挥着关键作用。土壤群落由植物根系及其相关的菌根真菌、细菌和真菌等微生物以及各种大小和营养类群的动物群组成，所有这些都在复杂的食物网中相互联系。然而，我们对树木根系如何调节土壤生物群的组成和多样性的理解仍然有限。本研究旨在确定四种针叶树的根系及其土壤性质对土壤细菌、真菌和线虫群落的影响。我们采集了单一针叶林的土壤和根系样本；日本温带森林中的密松（松）、日本落叶松（落叶松）、柏树（柏树）和日本杉木（雪松）。利用MiSeq高通量测序系统对细菌和真菌群落进行评估，在属/科水平上对线虫进行形态学鉴定，并对群落结构和营养组成进行检测。结果表明，松林土壤真菌丰度显著高于松林土壤，线虫丰度略高于松林土壤。4种树种的细菌丰度无显著差异。柏树林分真菌丰富度显著高于杉木林分，线虫丰富度显著高于杉木林分。真菌丰富度主要受根系性状的影响，线虫丰富度主要受土壤性状的影响。不同树种间细菌丰富度差异不显著。不同树种间细菌、真菌和线虫的群落结构差异显著。土壤性状对三种土壤生物群的群落结构均有显著影响，而根系性状对群落结构无显著影响。这些发现表明，独特的土壤生物群落是由根系改变的土壤环境塑造的。

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引用次数: 0

Elevation-dependent vulnerability of soil carbon pools to warming in a subtropical forest: Insights from a translocation experiment 亚热带森林土壤碳库对变暖的海拔依赖性脆弱性：来自易位实验的见解

IF 2.2 3区农林科学 Q3 ECOLOGY

Pedobiologia

Pub Date : 2025-12-01 DOI: 10.1016/j.pedobi.2025.151101

Pengyi Hou , Cui Deng , Maokui Lyu , Yongmeng Jiang , Yuming Lu , Jinsheng Xie

Global warming may cause widespread soil carbon loss across multiple regions. Subtropical montane ecosystems store substantial soil organic carbon (SOC). However, the impacts of global warming on SOC pools with varying stability levels remain unclear. We simulated warming using an altitudinal translocation approach in Wuyishan Mountain, subtropical China. Specifically, soil columns were moved downslope from 1400 m (coniferous forest) to 1000 m (mixed forest), from 1000 m to 600 m (evergreen broadleaf forest), and from 600 m to 200 m (again, evergreen broadleaf forest). We investigated warming-induced changes in labile carbon, recalcitrant carbon, and total carbon pool in soils, along with the underlying mechanisms. Results showed temperature increases (1.45–2.11°C) following downward translocation of soil cores. Warming reduced labile carbon across all elevations but decreased recalcitrant carbon only at higher elevations, with no net change in total carbon stocks. Mantel tests revealed stronger linkages between temperature, enzyme, and microbial communities at higher elevations. Structural equation modeling revealed that warming-induced changes in labile carbon, mediated by edaphic factors, directly influenced recalcitrant carbon. This cascaded effect reflects the integrated biotic-abiotic interactions driven by environmental change. Our findings identify high-elevation montane forests as critical hotspots of soil carbon vulnerability under warming, where disproportionate losses in mineral-associated carbon occur via thermal disruption of Fe-organic complexes. Protecting these elevational refugia requires urgent prioritization in climate-smart strategies. Specific management should target iron redox cycling, fungal functional traits, and oxidative enzyme activities to stabilize mineral-associated organic carbon.

全球变暖可能导致多个地区广泛的土壤碳流失。亚热带山地生态系统具有丰富的土壤有机碳储量。然而，全球变暖对不同稳定水平的有机碳库的影响尚不清楚。以武夷山地区为研究对象，采用垂直迁移方法模拟气候变暖。具体来说，土壤柱从1400 m（针叶林）下移至1000 m（混交林），从1000 m下移至600 m（常绿阔叶林），从600 m下移至200 m（同样是常绿阔叶林）。研究了气候变暖引起的土壤中活性碳、顽固性碳和总碳库的变化及其机制。结果表明，随着土芯向下迁移，温度升高（1.45 ~ 2.11℃）。变暖减少了所有海拔高度的不稳定碳，但只在高海拔地区减少了顽固性碳，总碳储量没有净变化。曼特尔测试显示，在高海拔地区，温度、酶和微生物群落之间存在更强的联系。结构方程模型显示，气候变暖引起的易变碳变化，由土壤因子介导，直接影响了难变碳。这种级联效应反映了由环境变化驱动的生物-非生物综合相互作用。我们的研究结果表明，高海拔山地森林是气候变暖下土壤碳脆弱性的关键热点，其中矿物相关碳的不成比例损失是通过铁有机复合物的热破坏发生的。保护这些高海拔地区需要在气候智能型战略中优先考虑。具体管理应针对铁氧化还原循环、真菌功能特征和氧化酶活性，以稳定矿物相关有机碳。

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引用次数: 0

Apple root channels continue to shape subsoil microarthropod communities more than a decade after orchard removal 苹果根槽在果园移除十多年后继续形成地下微节肢动物群落

IF 2.2 3区农林科学 Q3 ECOLOGY

Pedobiologia

Pub Date : 2025-11-14 DOI: 10.1016/j.pedobi.2025.151098

Hayden W. Bock, Suzanne M. Fleishman

Subsoils are often considered biologically inactive, yet the persistence of root channels in these habitats may significantly alter the distribution and diversity of soil organisms long after plant death. We investigated soil microarthropod communities in a former apple orchard in the northeastern United States approximately 13 years after tree removal, where we compared microarthropods in deep root channels (60–90 cm depth) with adjacent root-free bulk subsoil and surface soils. As anticipated, surface soils had the greatest abundance, richness, and diversity of soil microarthropods. Notably, however, deep root channels maintained distinctly richer and more diverse communities than surrounding bulk subsoil. Community analysis revealed that root channel fauna assemblages were compositionally distinct. The differences in beta diversity were due to a unique assemblage of species, rather than overlapping with the surface or bulk subsoil communities. These findings highlight root channels as long-lived microhabitats in deep soils, where detritosphere communities persist and provide resources and habitat to diverse soil organisms. By sustaining soil microarthropod diversity and providing refugia, root channels represent overlooked keystone structures in soil with potential for accelerating biological recovery and enhancing soil functionality in degraded or post-agricultural systems.

底土通常被认为是生物无活性的，然而在这些栖息地中根通道的持续存在可能会在植物死亡后很长一段时间内显著改变土壤生物的分布和多样性。我们在美国东北部的一个前苹果园调查了树木被砍伐约13年后的土壤微节肢动物群落，在那里我们比较了深根通道（60-90 cm深）中的微节肢动物与邻近无根的大块底土和表层土壤。正如预期的那样，表层土壤具有最大的土壤微节肢动物丰度、丰富度和多样性。然而，值得注意的是，深根通道比周围的块状底土保持了明显更丰富和更多样化的群落。群落分析表明，根槽区系组成明显不同。β多样性的差异是由于物种的独特组合，而不是与表层或大量底土群落重叠。这些发现强调了根通道是深层土壤中长期存在的微栖息地，在那里碎屑圈群落持续存在，并为各种土壤生物提供资源和栖息地。通过维持土壤微节肢动物的多样性和提供避难所，根通道是土壤中被忽视的关键结构，具有加速生物恢复和增强退化或后农业系统中土壤功能的潜力。

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引用次数: 0

Soil food webs in sugarcane fields: Sweet dreams for soil organisms in subtropical Africa 甘蔗田的土壤食物网：非洲亚热带土壤生物的美梦

IF 2.2 3区农林科学 Q3 ECOLOGY

Pedobiologia

Pub Date : 2025-11-12 DOI: 10.1016/j.pedobi.2025.151096

Juliette Chassain , John S. Terblanche , Charlene Janion-Scheepers

Sugarcane cultivation covers large areas in southern Africa, where it provides local employment and a substantial part of farming incomes. Maintaining soil quality in these areas is essential to prevent environmental damage following long-term cultivation. Soil biodiversity constitutes a good proxy to monitor soil quality. However, soil organisms and their interactions remain poorly studied in southern Africa. Soil food web studies contribute to the understanding of these complex belowground interactions. This study is the first to investigate soil food webs in sugarcane cultivation areas in Africa. We sampled 10 sugarcane fields subjected to different cropping (conventional versus regenerative) and harvesting (burning versus green cane) practices, and an unmanaged site included as a reference. Stable isotope analyses were conducted on sugarcane leaves, roots and crop residues, soil, and on the most abundant arthropod taxa including Araneae (spiders), Blattodea (cockroaches), Collembola (springtails), Dermaptera (earwigs), Diplopoda (millipedes), Formicidae (ants; Pheidole and Tetramorium genera), Hemiptera (leafhoppers) and Oribatida (oribatid mites). Food webs and trophic niches of arthropod taxa were characterized by assessing C and N stable isotope ratios (δ¹³C and δ¹⁵N) and by computing isotopic metrics. Higher δ¹⁵N values were observed for Araneae, Formicidae and Dermaptera, intermediate values for Oribatida and Collembola followed by Diplopoda and Blattodea, and lower values for Hemiptera. Food chain length was significantly shorter in fields with regenerative than conventional practices, and longer with green harvest than with pre-harvest burning or in the unmanaged site. Isotopic uniqueness and evenness were lower in green-harvested than in burnt fields. Our results highlight the trophic functional diversity of decomposers (Blattodea, Diplopoda, Collembola) and soil predators (Araneae, Dermaptera, Formicidae) in sugarcane fields, and the effects of agricultural practices on these food webs. Overall, this study contributes to further our knowledge on the composition and factors influencing soil biodiversity that remains understudied in Africa.

甘蔗种植覆盖了非洲南部的大片地区，为当地提供了就业机会和农业收入的很大一部分。维持这些地区的土壤质量对于防止长期耕作造成的环境破坏至关重要。土壤生物多样性是监测土壤质量的良好指标。然而，在南部非洲，土壤生物及其相互作用的研究仍然很少。土壤食物网的研究有助于理解这些复杂的地下相互作用。这项研究首次调查了非洲甘蔗种植区的土壤食物网。我们对10块甘蔗田进行了取样，这些甘蔗田采用了不同的种植方式（传统种植与再生种植）和收获方式（燃烧甘蔗与绿色甘蔗），并纳入了一个未管理的场地作为参考。对甘蔗的叶片、根系、作物残茬、土壤以及最丰富的节肢动物类群，包括蜘蛛亚目、蟑螂亚目、弹尾虫亚目、皮翅目（土蜈蚣）、双足目（千足虫）、蚁科（蚁属和蚁属）、半翅目（叶蝉）和甲螨亚目（甲螨）进行了稳定同位素分析。通过测定碳、氮稳定同位素比值（δ13C和δ15N）和计算同位素度量，对节肢动物类群的食物网和营养生态位进行了表征。其中，蜘蛛目、蚁科和皮翅目的δ15N值较高，甲蝇目和弹蝇目的δ15N值居中，其次为双足目和小蠊目，半翅目δ15N值较低。再生农田的食物链长度明显短于常规做法，绿色收获的食物链长度明显长于收获前焚烧或无管理的农田。绿色收获区同位素的唯一性和均匀性低于燃烧区。研究结果揭示了甘蔗田分解者（裂目目、双足目、刺尾目）和土壤捕食者（蜘蛛目、皮翅目、蚁科）的营养功能多样性，以及不同农业实践对这些食物网的影响。总的来说，这项研究有助于我们进一步了解非洲土壤生物多样性的组成和影响因素，这些因素仍未得到充分的研究。

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引用次数: 0

Unveiling the hidden soil predators of the Andes: Contrasting centipede responses to ecological factors along a successional gradient in tropical montane forests 揭示安第斯山脉隐藏的土壤捕食者：对比蜈蚣对热带山地森林演替梯度生态因子的反应

IF 2.2 3区农林科学 Q3 ECOLOGY

Pedobiologia

Pub Date : 2025-11-10 DOI: 10.1016/j.pedobi.2025.151095

Dennis Castillo-Figueroa , Camilo Castillo-Avila , Miguel Angel Jaramillo

Centipedes are among the top predators regulating soil food webs in terrestrial ecosystems. Yet, they remain one of the least studied groups of soil fauna, particularly regarding their ecology and natural history. This gap is especially pronounced in upper Andean tropical forests (UATF), where few surveys have been conducted despite extensive habitat transformation. In this study, we investigated changes in centipede communities along a successional gradient in UATF and identified the ecological factors associated with changes in their abundance. We collected 168 soil samples across four UATF sites along a successional gradient in Colombia, covering all climatic seasons in 2022. Differences in species composition between sites were analyzed using ANOSIM, NMDS, and SIMPER. We also measured forest structure (litter depth, slope, canopy openness, leaf area index), microclimatic conditions (temperature, moisture), and prey availability (abundance, richness) to examine their relationships with centipede abundance through simple and multiple regressions. A total of 291 individuals from eight species were recorded, with each forest site showing a distinct community. Centipede abundance followed a hump-shaped pattern along succession, with one species indicative of secondary forests and another characteristic of mature forests. Temperature fluctuation and prey availability were the main factors associated with total centipede abundance. However, the two centipede orders responded differently: Scolopendromorpha were primarily associated with maximum temperature, while Geophilomorpha were linked to a combination of prey availability, temperature fluctuation, and slope. Our findings provide novel insights into centipede ecology in tropical montane forests, highlighting the role of environmental gradients in shaping predator communities.

蜈蚣是陆地生态系统中调节土壤食物网的顶级捕食者之一。然而，它们仍然是研究最少的土壤动物群体之一，特别是在它们的生态和自然历史方面。这种差距在上安第斯热带森林（UATF）尤其明显，尽管栖息地发生了广泛的变化，但很少进行调查。研究了蜈蚣群落沿演替梯度的变化，确定了影响蜈蚣群落丰度变化的生态因子。我们在哥伦比亚沿连续梯度的四个UATF站点收集了168个土壤样本，涵盖了2022年的所有气候季节。利用ANOSIM、NMDS和SIMPER分析不同站点间物种组成的差异。我们还测量了森林结构（凋落物深度、坡度、冠层开度、叶面积指数）、小气候条件（温度、湿度）和猎物可用性（丰度、丰富度），通过简单和多元回归分析了它们与蜈蚣丰度的关系。共记录到8个物种291个个体，每个样地都有不同的群落。蜈蚣的丰度在演替过程中呈驼峰状，一种蜈蚣代表次生林，另一种蜈蚣代表成熟林。温度波动和猎物可得性是影响蜈蚣总丰度的主要因素。然而，两种蜈蚣目的反应不同：蜈蚣目主要与最高温度有关，而地蜈蚣目则与猎物可用性、温度波动和坡度有关。我们的研究结果为热带山地森林蜈蚣生态学提供了新的见解，突出了环境梯度在形成捕食者群落中的作用。

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引用次数: 0

Trichoderma guizhouense enhances tomato (Solanum lycopersicum) Ralstonia wilt suppression by organic fertilizer, focusing on rhizosphere soil bacterial community 有机肥增强贵州木霉对番茄枯萎病的抑制作用，重点关注根际土壤细菌群落

IF 2.2 3区农林科学 Q3 ECOLOGY

Pedobiologia

Pub Date : 2025-10-16 DOI: 10.1016/j.pedobi.2025.151094

Yanbo An , Xiaotong Ji , Jiahui Zhang , Qifeng Wu , Wenhao Jin , Jiajia Xing , Hua Qin

Trichoderma guizhouense is recognized as an effective antagonistic fungus against Ralstonia solanacearum, the causative agent of tomato bacterial wilt. However, how T. guizhouense-enriched organic fertilizer affects the survival of R. solanacearum and bacterial community in tomato rhizosphere soil is still poorly understood. To address this, a pot experiment was conducted to assess changes in the abundance of the fliC gene (a marker for R. solanacearum) and to investigate shifts in the rhizosphere bacterial community after T. guizhouense-enriched organic fertilizer application using quantitative PCR and high-throughput sequencing, respectively. The results showed that T. guizhouense-enriched organic fertilizer application significantly reduced the abundance of fliC gene in tomato rhizosphere soil after 15 days of R. solanacearum inoculation, and notably decreased the disease index of tomato wilt after 13 days of R. solanacearum inoculation (P < 0.05). Compared to common organic fertilizer application alone, T. guizhouense-enriched organic fertilizer application significantly increased the Shannon index of soil bacterial community and enhanced the relative abundance of beneficial bacterial genera, including Caulobacter, Chitinophaga and Bacillus. Both T. guizhouense-enriched organic fertilizer application and R. solanacearum inoculation significantly altered soil bacterial community composition. Moreover, the bacterial co-occurrence network exhibited greater complexity and cohesiveness in the T. guizhouense-enriched organic fertilizer application treatment, which could contribute to maintaining the stability of rhizospheric bacterial community of R. solanacearum-infected tomato. The findings suggested that T. guizhouense-enriched organic fertilizer would significantly suppress bacterial wilt and changed the bacterial community structure of the soil.

贵州木霉是一种有效的拮抗番茄青枯病病原菌。然而，目前对富贵州赤霉素有机肥对番茄根际土壤番茄枯枯菌存活及细菌群落的影响尚不清楚。为了解决这一问题，本研究采用盆栽试验方法，分别利用定量PCR和高通量测序技术，研究了施用贵州稻富有机肥后植株根际细菌群落的变化，以及fliC基因（番茄红霉的标记物）丰度的变化。结果表明，施用贵州赤霉素富有机肥可显著降低接种15 d番茄根际土壤flc基因丰度，显著降低接种13 d番茄枯萎病指数（P <； 0.05）。与单独施用普通有机肥相比，施用贵州土肥显著提高了土壤细菌群落的Shannon指数，提高了Caulobacter、Chitinophaga和Bacillus等有益菌属的相对丰度。施用富含贵州赤霉素的有机肥和接种茄青霉均显著改变了土壤细菌群落组成。富贵州赤霉病有机肥处理的细菌共生网络表现出更大的复杂性和内聚性，有助于维持番茄赤霉病根际细菌群落的稳定性。综上所述，富贵州土有机肥能显著抑制青枯病，改变土壤细菌群落结构。

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引用次数: 0

Variability in depth-mediated shifts in methanogen and methanotroph communities across tropical Andean mountain peatlands 热带安第斯山脉泥炭地产甲烷菌和养甲烷菌群落深度介导转移的变异性

IF 2.2 3区农林科学 Q3 ECOLOGY

Pedobiologia

Pub Date : 2025-10-14 DOI: 10.1016/j.pedobi.2025.151093

Angela Lafuente , Louis J. Lamit , Rodney A. Chimner , John Hribljan , Nathan Basiliko , Juan C. Benavides , Erik A. Lilleskov

The balance between methane producing and methane consuming microorganisms is partially responsible for the magnitude and direction of soil-atmosphere methane fluxes. Therefore, understanding the effects of vegetation and land use on relative abundance, community structure and vertical distribution of methane cycling microorganisms should help us interpret patterns of net emissions of methane. Mountain peatlands in the tropics are abundant and are important in global carbon cycling, but little is known about the communities of methane-cycling microorganisms in these ecosystems. We sampled peat from eight Andean peatlands in Peru, Ecuador and Colombia and described the dominant vegetation, grazing intensity and other site characteristics at each site. We characterised the microbial community of each peat sample at different depths and identified the methane cycling microorganisms. We observed a higher proportion of methanogens and methanogen:methanotroph in the shallow peat of grazed sites than ungrazed sites. At ungrazed sites we found relatively high methanotroph abundance relative to methanogens, even at the deepest sampling depths, suggesting plant aerenchymal oxygen transport structures communities at depth. We found changes in the methane cycling microbial communities among sites and with depth, e.g., in the superficial peat the hydrogenotrophic methanogens were more abundant but at depth there was more metabolic diversity. Our study provides new insights into the community structure of methane cycling microorganism of the tropical mountain peatlands, and raises interesting questions regarding the drivers of methanotroph abundance deeper in peat.

产生甲烷和消耗甲烷的微生物之间的平衡是土壤-大气甲烷通量的大小和方向的部分原因。因此，了解植被和土地利用对甲烷循环微生物相对丰度、群落结构和垂直分布的影响将有助于我们解释甲烷净排放的模式。热带山区泥炭地丰富，对全球碳循环具有重要意义，但对这些生态系统中甲烷循环微生物的群落知之甚少。我们从秘鲁、厄瓜多尔和哥伦比亚的8个安第斯泥炭地取样，描述了每个地点的优势植被、放牧强度和其他地点特征。我们对每个泥炭样品在不同深度的微生物群落进行了表征，并鉴定了甲烷循环微生物。放牧地浅层泥炭中产甲烷菌和产甲烷菌所占比例高于未放牧地。在未放牧的地点，即使在最深的采样深度，我们也发现相对于产甲烷菌而言，产甲烷菌的丰度相对较高，这表明植物的通气氧运输结构在深度群落中。我们发现甲烷循环微生物群落在不同地点和深度之间存在变化，例如在浅层泥炭中，氢营养型产甲烷菌更丰富，但在深度上则有更多的代谢多样性。我们的研究为热带山地泥炭地甲烷循环微生物群落结构提供了新的见解，并提出了有关泥炭深层甲烷养分丰度驱动因素的有趣问题。

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