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The soil microbial methylome: a tool to explore the role of epigenetic memory in driving soil abiotic legacy effects 土壤微生物甲基组:探索表观遗传记忆在驱动土壤非生物遗留效应中的作用的工具
IF 9.7 1区 农林科学
Soil Biology & Biochemistry Pub Date : 2025-01-08 DOI: 10.1016/j.soilbio.2025.109712
Tom Sizmur, Alexey Larionov
{"title":"The soil microbial methylome: a tool to explore the role of epigenetic memory in driving soil abiotic legacy effects","authors":"Tom Sizmur, Alexey Larionov","doi":"10.1016/j.soilbio.2025.109712","DOIUrl":"https://doi.org/10.1016/j.soilbio.2025.109712","url":null,"abstract":"Epigenetics is a phenomenon whereby a stable hereditable change in gene expression can occur without changing the DNA sequence. DNA methylation (the addition of a methyl group to specific nucleotides in specific DNA motifs) is the most studied epigenetic mechanism and is widely observed in both eukaryotic and prokaryotic cells. We hypothesise that the soil methylome may play an important role in the manifestation of soil abiotic legacy effects, whereby temporary exposure of soil microbial communities to particular environmental conditions influences future soil microbial function. These abiotic legacy effects are important because they underpin the delivery of key ecosystem services in response to global environmental change. Third generation long-read sequencing technologies, such as Pacific Bioscience Single-Molecule Real-Time sequencing (SMRT-seq) and Oxford Nanopore sequencing provide an opportunity to study methylome heterogeneity in complex microbial communities. The simultaneous measurement of epigenetic, transcriptional, and microbial community composition changes may lead to the development of biomarkers of historic environmental stress and a greater understanding of the role of the soil methylome in the resilience of soil microbial communities to future environmental perturbations. It is therefore timely to add the meta-epigenetic layer to the multi-omics analysis of the soil microbiome to advance our understanding of soil abiotic legacy effects.","PeriodicalId":21888,"journal":{"name":"Soil Biology & Biochemistry","volume":"16 1","pages":""},"PeriodicalIF":9.7,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142936812","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Thermodynamics of Microbial Decomposition of Persistent Carbon in Erosion-Buried Topsoils 侵蚀埋藏表层土壤中微生物分解持久性碳的热力学研究
IF 9.7 1区 农林科学
Soil Biology & Biochemistry Pub Date : 2025-01-06 DOI: 10.1016/j.soilbio.2025.109710
A.D. Mitchell, Helgason B.L
{"title":"Thermodynamics of Microbial Decomposition of Persistent Carbon in Erosion-Buried Topsoils","authors":"A.D. Mitchell, Helgason B.L","doi":"10.1016/j.soilbio.2025.109710","DOIUrl":"https://doi.org/10.1016/j.soilbio.2025.109710","url":null,"abstract":"Hillslope erosion in hummocky landscapes can lead to the accumulation of C-rich topsoil in depositional positions that eventually becomes buried if erosion persists. Our objective in this study was to evaluate the persistence of SOC and the thermodynamic efficiency of the microbial community in C-rich buried surface horizons from five sites with varied texture and organic matter contents. Surface Ah (0-10 cm) and buried surface (Ahb) horizons were isolated from intact cores, sieved (&lt;2 mm) and incubated under ideal conditions of temperature and moisture. Ahb soils had an average organic C content (25.6 mg OC g<sup>-1</sup> soil) similar to the corresponding Ah soil (30.9 mg OC g<sup>-1</sup> soil). Using isothermal calorimetry, we determined that Ah horizons produced significantly more heat and CO<sub>2</sub> but had smaller calorespirometric ratios than Ahb soils, under both basal (841 vs 3106 kJ mol<sup>-1</sup> CO<sub>2</sub>-C) and glucose metabolism (627 vs. 697 kJ mol<sup>-1</sup> CO<sub>2</sub>-C).100-day basal respiration was nearly four times greater in Ah vs. Ahb horizons. While MAOM correlated with basal heat production in both horizons, it only correlated with C persistence in the Ah horizons (Rho = 0.67, p &lt; 0.01), suggesting variability in C persistence was not primarily driven by organo-mineral bonds in Ahb horizons, although energy use efficiency is. Microbial community structure in Ahb horizons was distinct from the surface soils, and changed minimally during incubation, suggesting co-development of the community as decomposition proceeded over the decades of burial, leading to persistent C. These relatively large volume buried surface soils may provide unique opportunities to understand microbial hotspot C processes that are typically difficult to isolate at a spatially explicit scale (e.g., an aggregate interior). We propose that the co-development of distinct microbial communities in C-rich buried horizons leads to more thermally stable SOC, but further research is required to test this hypothesis.","PeriodicalId":21888,"journal":{"name":"Soil Biology & Biochemistry","volume":"21 1","pages":""},"PeriodicalIF":9.7,"publicationDate":"2025-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142929483","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Context-dependent contributions of arbuscular mycorrhizal fungi to host performance under global change factors 全球变化因子下丛枝菌根真菌对宿主性能的环境依赖性贡献
IF 9.7 1区 农林科学
Soil Biology & Biochemistry Pub Date : 2025-01-04 DOI: 10.1016/j.soilbio.2024.109707
Lennel Camuy-Velez, Ditam Chakraborty, Addisyn Young, Sakshi Paudel, Rylie Elvers, Miranda Vanderhyde, Kelly Walter, Chantal Herzog, Samiran Banerjee
{"title":"Context-dependent contributions of arbuscular mycorrhizal fungi to host performance under global change factors","authors":"Lennel Camuy-Velez, Ditam Chakraborty, Addisyn Young, Sakshi Paudel, Rylie Elvers, Miranda Vanderhyde, Kelly Walter, Chantal Herzog, Samiran Banerjee","doi":"10.1016/j.soilbio.2024.109707","DOIUrl":"https://doi.org/10.1016/j.soilbio.2024.109707","url":null,"abstract":"Arbuscular Mycorrhizal Fungi (AMF) contribute to host performance under stress conditions; however, the type and intensity of stress can shape this contribution. Importantly, the benefits of mycorrhizal symbiosis may also vary with the functional group of host plants. It also remains unclear whether multi-species inocula confer greater stress alleviation to hosts or if single-species inocula are sufficient for host resilience. To address these knowledge gaps, we conducted a global meta-analysis of 252 studies from 36 countries on six continents. Our analysis revealed that mycorrhizal associations enhance the phosphorus and nitrogen content of host biomass under these global change factors. However, contrary to previous meta-analyses that found consistently strong impacts of AMF, we found variable contributions of AMF under heat, cold, drought, salinity, pesticide, and heavy metal pollution. Each stress type has a unique impact on the contribution of AMF to host performance, but this impact also varies with the intensity of stress. Single-species AMF inocula contribute more significantly to host performance under stress compared to multi-species inocula. We also show that the contribution of AMF to plant growth response significantly varies across different plant functional groups, with grasses and legumes significantly benefiting from mycorrhizal associations under global change factors. Overall, this study highlights that the contribution of AMF to host performance under stress is highly context-dependent and influenced by various factors, including the type and intensity of stress, the type of inocula, and the functional groups of host plants. Thus, our meta-analysis can help develop hypotheses that can be tested with mechanistic experiments to gain a better understanding of the synergistic relationship between AMF and host plants in overcoming stress.","PeriodicalId":21888,"journal":{"name":"Soil Biology & Biochemistry","volume":"27 1","pages":""},"PeriodicalIF":9.7,"publicationDate":"2025-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142924658","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Soil pH promoted respiration is stimulated by exoenzyme kinetic properties for a Pinus tabuliformis forest of northern China 油松林土壤pH促进呼吸作用的外酶动力学特性研究
IF 9.7 1区 农林科学
Soil Biology & Biochemistry Pub Date : 2025-01-03 DOI: 10.1016/j.soilbio.2025.109709
Mengyao Xu, Zhiyong Zhou, Yinhua Guo, Ying Shen, Huan Zhang, Qiang Yu
{"title":"Soil pH promoted respiration is stimulated by exoenzyme kinetic properties for a Pinus tabuliformis forest of northern China","authors":"Mengyao Xu, Zhiyong Zhou, Yinhua Guo, Ying Shen, Huan Zhang, Qiang Yu","doi":"10.1016/j.soilbio.2025.109709","DOIUrl":"https://doi.org/10.1016/j.soilbio.2025.109709","url":null,"abstract":"The trends in 21<sup>st</sup> century climate change will be largely modulated by the amount of carbon respired via the enzymatic depolymerization of soil organic carbon (SOC). As soil pH serves as a key indicator of global change, understanding how soil respiration responds to pH induced changes in enzyme kinetic properties will provide valuable insights into the feedback of soil carbon to climate change. In a <em>Pinus tabuliformis</em> forest of northern China, a soil pH gradient ranging from 4.91 to 7.89 was constructed by applying ammonium nitrate at rates of 5, 10, 20, and 40 g N m<sup>-2</sup> yr<sup>-1</sup> (N5, N10, N20, and N40) and lime at rates of 50, 100, 200, and 400 g m<sup>-2</sup> yr<sup>-1</sup> (L50, L100, L200, and L400) since 2015. In August 2022, soil basal respiration, the β-glucosidase (BG) activity, and soil microbial properties were measured. Results revealed that soil basal respiration increased from 1.46 μmol CO<sub>2</sub> m<sup>-2</sup> s<sup>-1</sup> in N40 treatment to 2.36 CO<sub>2</sub> m<sup>-2</sup> s<sup>-1</sup> in L400 treatment, while the binding affinity of BG rose from 0.018 to 0.032 under the same treatments. The maximum activity of BG decreased from 119.82 nmol MUB·h<sup>-1</sup>·g<sup>-1</sup> SOM in N40 treatment to 66.80 nmol MUB·h<sup>-1</sup>·g<sup>-1</sup> SOM in L400 treatment. The temperature sensitivity of soil respiration showed a bell-shaped response to soil pH, with an optimal pH of about pH 6.7. Our findings demonstrated that it was the binding affinity instead of the activity of BG that positively promoted soil respiration across the established soil pH gradient. The underpinning mechanisms linking soil respiration with enzyme functions were ascribed to the soil acid-base microenvironment, which affected the bioavailability of key nutrient and the content of soil inorganic nitrogen. Additionally, these results will improve the understanding of enzymatic mechanisms in driving the biogeochemical cycle of SOC.","PeriodicalId":21888,"journal":{"name":"Soil Biology & Biochemistry","volume":"15 1","pages":""},"PeriodicalIF":9.7,"publicationDate":"2025-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142917756","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Heterotrophic nitrification in soils: approaches and mechanisms 土壤中的异养硝化作用:途径和机制
IF 9.7 1区 农林科学
Soil Biology & Biochemistry Pub Date : 2024-12-31 DOI: 10.1016/j.soilbio.2024.109706
Elizaveta P. Pulikova, Andrey V. Gorovtsov, Yakov Kuzyakov, Konstantin A. Demin, Tatiana M. Minkina, Vishnu D. Rajput
{"title":"Heterotrophic nitrification in soils: approaches and mechanisms","authors":"Elizaveta P. Pulikova, Andrey V. Gorovtsov, Yakov Kuzyakov, Konstantin A. Demin, Tatiana M. Minkina, Vishnu D. Rajput","doi":"10.1016/j.soilbio.2024.109706","DOIUrl":"https://doi.org/10.1016/j.soilbio.2024.109706","url":null,"abstract":"Studies on nitrification, a crucial process of biogeochemical N cycling, have traditionally focused on autotrophic microorganisms. Recent discoveries, however, highlight the importance of heterotrophic nitrification as a key of N cycling, particularly in acidic soils. While molecular approaches have advanced our understanding of the key players in autotrophic nitrification, the biochemical mechanisms and corresponding genes of heterotrophic nitrification are nearly unknown. First, we reviewed the advantages and limitations of existing approaches to analyze heterotrophic nitrification in soils. <sup>15</sup>N labeling of organic compounds (e.g. amino acids) allows to determine solely the nitrification of organic N. Because many bacteria have similar autotrophic nitrification enzymes that oxidize inorganic N, it is necessary to inhibit autotrophic nitrification to determine the heterotrophic N nitrification activity by <sup>15</sup>N techniques. The use of existing inhibitors, however, can mislead the conclusions because not all inhibitors stop autotrophic nitrification completely, and some can decrease heterotrophic nitrification. Their effects strongly depend on the composition of the nitrifier community and soil properties. The use of modern molecular approaches is limited by suitable genetic biomarkers. Second, we propose the following methods to investigate heterotrophic nitrification processes: i) isolation and purification of heterotrophic nitrification enzymes, followed by determination of the amino acid sequence of proteins to design genetic markers; ii) use of DNA-based stable isotopes (<sup>13</sup>C, <sup>15</sup>N); iii) combining fluorescence <em>in situ</em> hybridization with microautoradiography (<sup>14</sup>C) to determine the composition of heterotrophic nitrifier communities; and iv) scheme to select autotrophic nitrification inhibitors. We suggest to improve the existing approaches to shed new light on the processes of heterotrophic nitrification, which can reach 99% of total nitrification in forest soils and strongly affect N stocks and fluxes in terrestrial ecosystems.","PeriodicalId":21888,"journal":{"name":"Soil Biology & Biochemistry","volume":"18 1","pages":""},"PeriodicalIF":9.7,"publicationDate":"2024-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142904747","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Spatiotemporal dynamics of reactive oxygen species in the detritusphere and their critical roles in organic carbon mineralisation 碎屑层中活性氧的时空动态及其在有机碳矿化中的关键作用
IF 9.7 1区 农林科学
Soil Biology & Biochemistry Pub Date : 2024-12-30 DOI: 10.1016/j.soilbio.2024.109700
Kangjie Yang, Jinbo Liu, Zhiqiang Wang, Kecheng Zhu, Bin Jia, Huiqiang Yang, Jianjun Qin, Jia Xie, Junaid Latif, Fuhao Liu, Yanpei Li, Na Chen, Hanzhong Jia
{"title":"Spatiotemporal dynamics of reactive oxygen species in the detritusphere and their critical roles in organic carbon mineralisation","authors":"Kangjie Yang, Jinbo Liu, Zhiqiang Wang, Kecheng Zhu, Bin Jia, Huiqiang Yang, Jianjun Qin, Jia Xie, Junaid Latif, Fuhao Liu, Yanpei Li, Na Chen, Hanzhong Jia","doi":"10.1016/j.soilbio.2024.109700","DOIUrl":"https://doi.org/10.1016/j.soilbio.2024.109700","url":null,"abstract":"Reactive oxygen species (ROS) are recognised as important drivers of biogeochemical processes. However, the dynamics and distribution of ROS and their effects on carbon emissions in the detritusphere remain elusive. Herein, we visualised the production of ROS <em>in situ</em> (i.e. superoxide radical, O<sub>2</sub><sup>•−</sup>; hydrogen peroxide, H<sub>2</sub>O<sub>2</sub>; and hydroxyl radical, <sup>•</sup>OH) in the detritusphere using a ROS-trapping agar gel, of which the contents gradually increased and then decreased with residue decay. Spatially, O<sub>2</sub><sup>•−</sup> content gradually decreased with increasing distance from residue, whereas H<sub>2</sub>O<sub>2</sub> content increased. Interestingly, the content of <sup>•</sup>OH increased from 3.2 to 4.3 μmol kg<sup>-1</sup> and decreased from 6.9 to 3.9 μmol kg<sup>-1</sup> with increasing distance from residue after incubation for 3 d and 24 d, respectively. Spearman correlation analysis revealed that O<sub>2</sub><sup>•−</sup>production was closely related to the oxidation of water-soluble phenols by phenol oxidase. In contrast, H<sub>2</sub>O<sub>2</sub> production correlated with microbial abundance, suggesting that microorganisms served as primary drivers of H<sub>2</sub>O<sub>2</sub> production in the detritusphere. Results from incubation experiment suggest that the dominant drivers of <sup>•</sup>OH production shifted from Fe(II) to water-extractable organic carbon (WEOC) between day 3 and day 24 of residue decomposition. Furthermore, autoclaving reduced <sup>•</sup>OH content regardless of Fe(II) or WEOC presence, highlighting the important role of microorganism in <sup>•</sup>OH generation. The formed ROS significantly influenced the mineralisation of organic carbon (OC, <em>P</em> &lt; 0.05), and the contributions varied by type of ROS. Specifically, ROS quenching experiments showed that <sup>•</sup>OH and O<sub>2</sub><sup>•−</sup> stimulated OC mineralisation by 15% and 4%, respectively, while H<sub>2</sub>O<sub>2</sub> reduced it by 18%. The obtained information highlights detritusphere as pervasive yet previously underestimated hotspots for ROS production, which has significant implication for soil OC mineralisation and priming effect.","PeriodicalId":21888,"journal":{"name":"Soil Biology & Biochemistry","volume":"14 1","pages":""},"PeriodicalIF":9.7,"publicationDate":"2024-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142901840","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Earthworms buffer the impacts of nitrogen enrichment on energy dynamics of soil micro-food webs 蚯蚓缓冲了富氮对土壤微食物网能量动态的影响
IF 9.7 1区 农林科学
Soil Biology & Biochemistry Pub Date : 2024-12-30 DOI: 10.1016/j.soilbio.2024.109705
Bingbing Wan, Andrew D. Barnes, Mingyu Li, Yuanyuan Song, Qian Yang, Xiaoyun Chen, Feng Hu, Manqiang Liu
{"title":"Earthworms buffer the impacts of nitrogen enrichment on energy dynamics of soil micro-food webs","authors":"Bingbing Wan, Andrew D. Barnes, Mingyu Li, Yuanyuan Song, Qian Yang, Xiaoyun Chen, Feng Hu, Manqiang Liu","doi":"10.1016/j.soilbio.2024.109705","DOIUrl":"https://doi.org/10.1016/j.soilbio.2024.109705","url":null,"abstract":"Anthropogenic nitrogen (N) enrichment is an important driver of global soil biodiversity loss, particularly for large-bodied consumers at the higher trophic levels of food webs. This driver is predicted to vastly impact the energy dynamics in soil food webs, which underpin ecosystem functioning and services. Yet, we still lack empirical evidence about how N-enrichment and the loss of large consumers (e.g., earthworms) might affect the energetic structure of soil food webs and associated ecosystem functions. Here, based on a 4-year field manipulation experiment, we explore the interactive effects of increasing N inputs and earthworms on the energy dynamics and trophic functions (i.e., herbivory, decomposition and predation) of soil micro-food webs. Our results revealed that after earthworm removal, total and average energy flux of soil micro-food webs decreased linearly as N input increased, largely explained by functional diversity. Specifically, decomposition, as indicated by energy flux through decomposers, initially decreased and then increased with increasing N inputs, while herbivory and predation decreased linearly. However, earthworm activities mitigated such negative effects of N enrichment on energy dynamics, maintaining total and average energy flux largely unchanged across the N gradient. Along with functional diversity, we also found that earthworm-induced changes in taxonomic diversity was positively correlated with total and average energy flux, possibly attributed to facilitating species interactions and thus fostering energy transfers. These findings emphasize the importance of protecting large consumers as biotic buffers to counteract biodiversity loss and maintain trophic functions under future N enrichment.","PeriodicalId":21888,"journal":{"name":"Soil Biology & Biochemistry","volume":"4 1","pages":""},"PeriodicalIF":9.7,"publicationDate":"2024-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142901983","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Multitrophic interactions support belowground carbon sequestration through microbial necromass accumulation in dryland biocrusts 多营养相互作用支持地下碳固存通过微生物坏死团积累在旱地生物壳
IF 9.7 1区 农林科学
Soil Biology & Biochemistry Pub Date : 2024-12-30 DOI: 10.1016/j.soilbio.2024.109708
Jia Shi, Lijia Lu, Jingxi Zang, Yuanze Sun, Jianguo Tao, Zelong Zhao, Xiang Wang, Jie Wang
{"title":"Multitrophic interactions support belowground carbon sequestration through microbial necromass accumulation in dryland biocrusts","authors":"Jia Shi, Lijia Lu, Jingxi Zang, Yuanze Sun, Jianguo Tao, Zelong Zhao, Xiang Wang, Jie Wang","doi":"10.1016/j.soilbio.2024.109708","DOIUrl":"https://doi.org/10.1016/j.soilbio.2024.109708","url":null,"abstract":"Belowground organisms play essential roles in biogeochemical cycling of carbon. However, it remains unknown how species interactions across multiple trophic levels influence soil carbon sequestration. Biological soil crusts (biocrusts) comprise multiple trophic groups, forming an ideal model system to study species interactions in natural communities. This study explored the critical role of multitrophic interactions in shaping the accumulation of microbial necromass carbon (MNC), comparing biocrust-covered and bare soils in the dryland ecosystem of the Loess Plateau. Amino sugars were used as indicators of soil microbial necromass, and environmental DNA sequencing was used to characterize multitrophic communities in soil samples. Biocrust-associated soils exhibited 2.5 times higher MNC than bare soils, with bacterial necromass carbon (BNC) constituting a larger proportion of soil organic carbon than fungal necromass carbon (FNC). Greater network complexity and more frequent within-trophic associations (WTAs) were observed for bare soils. The proportion of negative WTAs was negatively correlated with MNC, whereas the proportion of cross-trophic associations (CTAs) was positively correlated with MNC. Community composition, hierarchical interactions, and network complexity all shaped microbial necromass carbon accumulation. This study illustrates a novel mechanism contributing to carbon sequestration in dryland ecosystems, wherein multitrophic interactions within the soil micro-food web regulate microbial necromass accumulation, and sheds light on the dynamics and stabilization of soil microbial necromass.","PeriodicalId":21888,"journal":{"name":"Soil Biology & Biochemistry","volume":"10 1","pages":""},"PeriodicalIF":9.7,"publicationDate":"2024-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142901839","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Spatial heterogeneity of high-affinity H2 oxidation activity in agricultural soil profile 农业土壤高亲和力H2氧化活性的空间异质性
IF 9.7 1区 农林科学
Soil Biology & Biochemistry Pub Date : 2024-12-28 DOI: 10.1016/j.soilbio.2024.109703
Lijun Hou, Philippe Constant, Joann K. Whalen
{"title":"Spatial heterogeneity of high-affinity H2 oxidation activity in agricultural soil profile","authors":"Lijun Hou, Philippe Constant, Joann K. Whalen","doi":"10.1016/j.soilbio.2024.109703","DOIUrl":"https://doi.org/10.1016/j.soilbio.2024.109703","url":null,"abstract":"Soil H<sub>2</sub> oxidizing bacteria metabolize H<sub>2</sub> from the atmosphere, but soil carbon substrates and environmental factors influence their distribution in the soil profile. We conducted a field survey of the spatial distribution of H<sub>2</sub> content and high-affinity H<sub>2</sub> oxidation activity in the soil profile (5 cm, 15 cm, and 35 cm) and between the soybean rhizosphere and bulk soil. We found the H<sub>2</sub> content declined exponentially with soil depth, but potential H<sub>2</sub> oxidation activity was consistent at all soil depths. The rhizosphere soil had 66% more high-affinity H₂ oxidation activity than bulk soil. Simultaneous presence of H<sub>2</sub> and carbon likely facilitates mixotrophic growth of H<sub>2</sub> oxidizing bacteria in the rhizosphere.","PeriodicalId":21888,"journal":{"name":"Soil Biology & Biochemistry","volume":"114 1","pages":""},"PeriodicalIF":9.7,"publicationDate":"2024-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142888928","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Arbuscular mycorrhizal fungal highways – what, how and why? 丛枝菌根真菌高速公路-什么,如何和为什么?
IF 9.7 1区 农林科学
Soil Biology & Biochemistry Pub Date : 2024-12-28 DOI: 10.1016/j.soilbio.2024.109702
Caroline Krug Vieira, Matheus Nicoletti Marascalchi, Martin Rozmoš, Oldřich Benada, Valeriia Belova, Jan Jansa
{"title":"Arbuscular mycorrhizal fungal highways – what, how and why?","authors":"Caroline Krug Vieira, Matheus Nicoletti Marascalchi, Martin Rozmoš, Oldřich Benada, Valeriia Belova, Jan Jansa","doi":"10.1016/j.soilbio.2024.109702","DOIUrl":"https://doi.org/10.1016/j.soilbio.2024.109702","url":null,"abstract":"Arbuscular mycorrhizal (AM) fungal structures, such as spores, vesicles, extra- and intra- radical hyphae, are home to diverse communities of prokaryotic (bacterial and archaeal) taxa and can have significant impact on the movement and behavior of those microbes within the soil. The ability to disperse via fungal hyphae, known as the fungal highway effect, was first observed in ectomycorrhiza and later in other fungal groups. This effect may benefit soil prokaryotes allowing them to explore new microhabitats in soil, offering advantages such as improved nutrient access, enhanced dispersal and colonization. Although the term “fungal highways” is well established, there still are only few studies that address the partner interactions and movement of microorganisms through the hyphal networks when referring to AM fungi. Bacteria can colonize the surfaces of hyphae and form biofilms that provide protection for both the bacteria and the fungus, influence the nutrient cycles, giving the bacteria access to resources transported by the fungus. Bacteria movement on AM fungal hyphae is facilitated by several mechanisms, including physical transport along the hyphal networks, swimming within the continuous water films that develop along the hyphal surfaces, and chemotaxis, where the bacteria move towards or away from specific chemical signals. Overall, the interactions between bacteria and AM fungi appears as a dynamic and complex process. Yet, we still do not know much about the influence of soil properties, plant age and species, seasonality, soil management and different climate with respect to AM fungal highways and microbiomes. Here, we review the current knowledge on prokaryotic movement through AM fungal hyphosphere and the possible factors that could affect it. Future research needs to elucidate mechanisms involved in the recruitment and/or migration of microbes in the AM fungal hyphosphere. Understanding these interactions may eventually help developing more sustainable agricultural practices and/or support environmental conservation.","PeriodicalId":21888,"journal":{"name":"Soil Biology & Biochemistry","volume":"30 1","pages":""},"PeriodicalIF":9.7,"publicationDate":"2024-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142888929","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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