Pedobiologia最新文献_第2页

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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引用次数: 0

Greater influence of eukaryotes on carbon degradation potentials than prokaryotes along an elevation gradient 沿着海拔梯度，真核生物对碳降解潜力的影响比原核生物更大

IF 2.2 3区农林科学 Q3 ECOLOGY

Pedobiologia

Pub Date : 2025-10-03 DOI: 10.1016/j.pedobi.2025.151092

Weihong Huang , Junqi Wang , Yan Zhou , Ximei Xue , He Zeng , Mingkuang Wang , Hendrikus J. Laanbroek , Qiufang Zhang

Prokaryotic and eukaryotic microbial diversities are regulated by soil properties (e.g., soil organic matter, SOM), but their interactions and capacity to degrade carbon compounds remain unclear due to vegetation succession along elevation and climatic gradients. Fresh soils from different elevations and climates were collected from five sites covering different vegetation distributed vertically in the typical subtropical zone of Wuyishan. The community composition of microorganisms, carbon-degrading potentials and soil properties were analysed. The results showed that SOM, i.e., organic carbon, humus and fulvic acid, increased significantly along the vegetation types that existed along the elevation gradients. Prokaryotic and eukaryotic communities were distinguished by elevation and vegetation type, respectively. The pivotal role of prokaryotes in co-occurrence network was stronger than that of eukaryotes. The available potassium, organic carbon, humus, fulvic acids and humin carbons significantly affected the composition of prokaryotes and eukaryotes. In contrast, ammonium and available phosphorus alone affected the prokaryotic community composition, while pH and nitrate only affected the eukaryotic community composition. Correlations between carbon utilization potential and dominant eukaryotic taxa were more intense than those with prokaryotic taxa. Compared with prokaryotes, the carbon utilization potentials of eukaryotic taxa were more limited by changes in climate driven by increasing elevation. Our study illuminated that the differences in elevation gradient and vegetation type jointly drove the distinct diversity of the microbial communities and further affected their carbon-degrading potential. It would give insight into predict the effects of microorganisms on the carbon content transformation of different vegetation types under climate change.

原核和真核微生物多样性受土壤性质（如土壤有机质）的调节，但由于植被沿海拔和气候梯度的演替，它们的相互作用和降解碳化合物的能力尚不清楚。在武夷山典型亚热带不同植被垂直分布的5个站点采集不同海拔和气候的新鲜土壤。分析了土壤微生物群落组成、碳降解潜力和土壤性质。结果表明：土壤有机质（有机碳、腐殖质和黄腐酸）沿高程梯度分布的植被类型显著增加；原核生物群落和真核生物群落分别以海拔高度和植被类型区分。原核生物在共现网络中的关键作用强于真核生物。速效钾、有机碳、腐殖质、黄腐酸和人类碳对原核生物和真核生物的组成有显著影响。铵态氮和有效磷单独影响原核生物群落组成，而pH和硝酸盐只影响真核生物群落组成。碳利用潜力与优势真核类群的相关性比与优势原核类群的相关性更强。与原核生物相比，真核生物类群的碳利用潜力更受海拔升高引起的气候变化的限制。研究表明，海拔梯度和植被类型的差异共同驱动了微生物群落的明显多样性，并进一步影响了它们的碳降解潜力。这将有助于预测气候变化下微生物对不同植被类型碳含量转化的影响。

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引用次数: 0

Plant growth-promoting rhizobacteria-mediated remediation of glyphosate-contaminated tea plantation soils through restoration of nutrient cycling and microbial diversity 促进植物生长的根瘤菌介导的草甘膦污染茶园土壤养分循环和微生物多样性修复

IF 2.2 3区农林科学 Q3 ECOLOGY

Pedobiologia

Pub Date : 2025-09-17 DOI: 10.1016/j.pedobi.2025.151090

Xu Zhang , Min Cai , Jiaji Lin , Weidong Wang , Yujie Jiao , Litang Lu

Glyphosate is a broad-spectrum herbicide widely used in tea plantations worldwide, however, its excessive use has exerted significant negative impacts on soil ecology and tea plant growth. Therefore, effective ecological remediation strategies are urgently required. In this study, a three-year field experiment was conducted in a glyphosate-treated tea plantation soil, where a plant growth-promoting rhizobacteria (PGPR) compound inoculant was applied following herbicide treatment. Metagenomic analysis was further performed to evaluate the remediation efficacy of PGPR. The results demonstrated that PGPR application significantly increased soil pH and nutrient levels (e.g., organic carbon, available nitrogen, phosphorus, and potassium) and enhanced soil enzyme activities, including protease, urease, acid phosphatase. PGPR inoculation also restored microbial diversity, optimized community structure, and upregulated functional genes associated with carbon, nitrogen, and phosphorus cycling. Moreover, tea leaf quality was improved, as evidenced by an increase in amino acid content and a reduction in phenol-ammonia ratio. Overall, the introduction of PGPR effectively mitigated the adverse impacts of glyphosate, thereby improving soil health and tea quality. These findings indicate that PGPR represents an environmentally friendly bioremediation strategy capable of restoring glyphosate-contaminated tea plantation soils and its ecosystem functions, thereby underscoring its practical value and ecological significance for sustainable tea plantation management.

草甘膦是一种广泛应用于全球茶园的广谱除草剂，但草甘膦的过量使用对土壤生态和茶树生长产生了显著的负面影响。因此，迫切需要有效的生态修复策略。本研究在草甘膦处理的茶园土壤中进行了为期3年的田间试验，在除草剂处理后施用促进植物生长的根瘤菌（PGPR）复合接种剂。进一步进行宏基因组分析，评价PGPR的修复效果。结果表明，施用PGPR显著提高了土壤pH值和养分水平（如有机碳、速效氮、磷和钾），提高了土壤酶活性，包括蛋白酶、脲酶、酸性磷酸酶。接种PGPR还恢复了微生物多样性，优化了群落结构，上调了与碳、氮、磷循环相关的功能基因。此外，氨基酸含量增加，酚氨比降低，茶叶品质得到改善。总体而言，PGPR的引入有效减轻了草甘膦的不利影响，从而改善了土壤健康和茶叶品质。这些结果表明，PGPR是一种环境友好型的生物修复策略，能够恢复草甘膦污染的茶园土壤及其生态系统功能，从而强调了其在可持续茶园管理中的实用价值和生态意义。

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引用次数: 0

Soil biodiversity drives ecosystem multifunctionality across natural and degraded Atlantic Forest landscapes 土壤生物多样性推动大西洋自然和退化森林景观生态系统的多功能性

IF 2.2 3区农林科学 Q3 ECOLOGY

Pedobiologia

Pub Date : 2025-08-12 DOI: 10.1016/j.pedobi.2025.151079

Gislaine dos Santos Nascimento , Tancredo Augusto Feitosa de Souza , Jeane Cruz Portela

Soil biodiversity is a fundamental driver of ecosystem multifunctionality, yet its role in tropical seasonal dry forests remains underexplored. In this study, we evaluated how soil biodiversity influences primary production, ecosystem stability, nutrient cycling, and soil fertility across three land uses (natural ecosystem, pasture, and deforested area) and two seasons (rainy and dry), using a 3 × 2 randomized block design replicated over three years. Soil biodiversity was characterized through the abundance and diversity of insects, arachnids, myriapods, nematodes, arbuscular mycorrhizal fungi, macroscopic fungi, and microbial gene diversity. Pearson’s correlation analysis showed strong positive relationships between soil biodiversity and primary production (r = 0.97), ecosystem stability (r = 0.98), and nutrient cycling (r = 0.82). The multifunctionality index was up to 2.4 times higher in natural ecosystems compared to deforested sites. Deforestation led to an 88 % reduction in plant richness, replacing native species with disturbance-tolerant taxa such as Cenchrus echinatus and Mimosa hostilis. PCA and PERMANOVA confirmed significant impacts of land use on multifunctionality (p < 0.001), with the natural ecosystem exhibiting higher functional performance, except for soil fertility, which remained unchanged. Our results demonstrate that soil biodiversity is not merely a passive ecosystem component but a critical determinant of ecosystem functioning and resilience. To support long-term sustainability in tropical dry forests, land management and restoration efforts should explicitly integrate soil biodiversity conservation strategies. These include preserving native vegetation, minimizing soil disturbance, and promoting diverse soil communities to maintain multifunctionality under increasing environmental pressures.

土壤生物多样性是生态系统多功能性的基本驱动力，但其在热带季节性干旱森林中的作用仍未得到充分探索。在这项研究中，我们利用3 × 2的随机区组设计，评估了土壤生物多样性如何影响三种土地利用方式（自然生态系统、牧场和毁林区）和两个季节（雨季和旱季）的初级生产、生态系统稳定性、养分循环和土壤肥力。土壤生物多样性主要表现为昆虫、蛛形纲、多足类、线虫、丛枝菌根真菌、宏观真菌和微生物基因多样性的丰度和多样性。Pearson相关分析表明，土壤生物多样性与初级生产（r = 0.97）、生态系统稳定性（r = 0.98）和养分循环（r = 0.82）呈正相关关系。与毁林地相比，自然生态系统的多功能性指数最高可达2.4倍。森林砍伐导致植物丰富度减少了88 %，本地物种被耐干扰的分类群（如Cenchrus echinatus和Mimosa hostiis）所取代。PCA和PERMANOVA证实了土地利用对多功能性的显著影响（p <； 0.001），除了土壤肥力保持不变外，自然生态系统表现出更高的功能表现。我们的研究结果表明，土壤生物多样性不仅仅是一个被动的生态系统组成部分，而且是生态系统功能和恢复力的关键决定因素。为支持热带干旱森林的长期可持续性，土地管理和恢复工作应明确纳入土壤生物多样性保护战略。这些措施包括保护原生植被，尽量减少土壤干扰，促进土壤群落多样化，以在日益增加的环境压力下保持多功能。

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引用次数: 0

Subtropical EM- surmmcpass AM-dominated forests in increasing soil inorganic nitrogen availability: Evidence from a controlled field experiment 亚热带EM- surmpass am主导森林提高土壤无机氮有效性：来自对照田间试验的证据

IF 2.2 3区农林科学 Q3 ECOLOGY

Pedobiologia

Pub Date : 2025-08-12 DOI: 10.1016/j.pedobi.2025.151080

Yiting Qiu , Hang-Wei Hu , Hao Yang , Xiaoyu Chen , Jiamian Shi , Guigang Lin , Liuming Yang , Shengsheng Jin , Guangshui Chen , Jun-Tao Wang , Zhiqun Huang , Ji-Zheng He , Yong Zheng

Although the impacts of tree mycorrhizal type on soil nitrogen (N) cycling have been extensively studied in temperate forests, our knowledge from subtropical forests remains limited. We investigated soil N availability, specific N-acquisition enzyme activities (specific Nacq) and their relationships in 2-year old forests with arbuscular mycorrhizal (AM) and ectomycorrhizal (EM) trees planting, for two seasons. Results showed that soil inorganic N (NH₄⁺-N and NO₃^–-N) and specific Nacq were significantly higher in EM than in AM forests in the summer. There was a significant negative correlation between soil specific Nacq and NO₃^–-N content, indicating that increased N availability significantly inhibited specific Nacq. This study improves our understanding of soil N cycling by revealing the relationship between soil specific Nacq and inorganic N dynamics in subtropical AM- and EM-dominated forests.

虽然树木菌根类型对土壤氮循环的影响已经在温带森林中得到了广泛的研究，但我们对亚热带森林的了解仍然有限。研究了2年生丛枝菌根（AM）和外生菌根（EM）树木造林的土壤氮素有效性、特定氮素获取酶活性（specific Nacq）及其相互关系。结果表明，夏季EM林地土壤无机氮（NH4+-N、NO3——N）和比Nacq显著高于AM林地；土壤特定Nacq与NO3—N含量呈显著负相关，说明氮素有效性的提高显著抑制了土壤特定Nacq。本研究揭示了亚热带AM和em优势林地土壤特定Nacq与无机氮动态的关系，提高了我们对土壤氮循环的认识。

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引用次数: 0

Microannelids (Enchytraeidae, Naididae, Parergodrilidae) along a 4000 m Afrotropical elevational gradient on Mount Cameroon 喀麦隆山海拔4000 m的热带海拔梯度上的微链动物（蛭形虫科、蛭形虫科、拟蛭形虫科）

IF 2.2 3区农林科学 Q3 ECOLOGY

Pedobiologia

Pub Date : 2025-08-12 DOI: 10.1016/j.pedobi.2025.151078

Jiří Schlaghamerský , Rüdiger M. Schmelz , Jiří Doležal , Miloslav Devetter

Knowledge of the enchytraeid fauna in sub-Saharan Africa is limited to a few specimens collected during the 20th century, often described as new species. No quantitative data or records of other annelids within the soil mesofauna have been reported. Addressing this gap, we studied species diversity, densities and biomass of soil-dwelling microannelids across a wide range of habitats. In 2013, during the transition from the wet to dry season, we sampled an elevational gradient on Mount Cameroon from coastal lowland rainforest, through montane forests and savanna, to Afroalpine grassland at 4000 m a.s.l. (11 elevations, 3 sites each). Specimens obtained by wet funnel extraction were counted, measured and identified based on morphological characters (molecular barcoding of some). Biomass was assessed based on the body length : volume ratio. The obtained 357 specimens represented approximately 16 enchytraeid species (many yet to be described) from 6 genera (Buchholzia, Enchytraeus, Fridericia, Hemienchytraeus, Henlea, and Xetadrilus), Pristina cf. jenkinae (Naididae) and the "polychaete" Parergodrilus cf. heideri (Parergodrilidae). The latter was recorded for the first time in Africa and in the tropics. Mean microannelid densities varied from 0 in the savanna at 3100 m a.s.l. to 4178 ± 875 individuals per square metre (± SE) in Afroalpine grassland at 4000 m a.s.l., where also the highest biomass, 0.88 g dry weight per square metre, was reached. Whereas species richness was considerable, densities were comparable to the few tropical sites for which data have been published but much lower than those often found in colder climates.

在撒哈拉以南非洲，人们对内壳类动物的了解仅限于20世纪收集的一些标本，这些标本通常被描述为新物种。土壤中动物群中没有其他环节动物的定量数据或记录。为了填补这一空白，我们研究了土壤微环节动物在广泛栖息地的物种多样性、密度和生物量。2013年，在从湿季到旱季的过渡期间，我们对喀麦隆山的海拔梯度进行了采样，从沿海低地雨林，到山地森林和稀树草原，再到海拔4000 m的非洲高山草原（11个海拔高度，每个海拔3个地点）。通过湿漏斗提取得到的标本，根据形态学特征（部分标本的分子条形码）进行计数、测量和鉴定。生物量根据体长 ： 体积比进行评估。获得的357个标本代表了6属（Buchholzia, Enchytraeus, Fridericia, Hemienchytraeus， Henlea和Xetadrilus）， Pristina cf. jenkinae （Naididae）和“多毛纲”Parergodrilus cf. heideri （Parergodrilidae）的16种（许多尚未描述）。后者首次在非洲和热带地区被记录。平均微链动物密度在热带稀树草原（3100 m a.s.l.）为0，在非洲高寒草原（4000 m a.s.l.）为4178 ± 875只/平方米（±SE），其中生物量最高，为0.88 g /平方米干重。虽然物种丰富度相当可观，但密度与已公布数据的少数热带地点相当，但远低于在较冷气候中经常发现的物种。

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引用次数: 0