Soil Biology & Biochemistry最新文献

{"title":"Unraveling the edaphic factors driving organic material decay: Insights from long-term manure application studies","authors":"Yuting Fu ,&nbsp;Sabine Ravnskov ,&nbsp;Marcos Paradelo ,&nbsp;Lis W. de Jonge ,&nbsp;Emmanuel Arthur","doi":"10.1016/j.soilbio.2025.109711","DOIUrl":"10.1016/j.soilbio.2025.109711","url":null,"abstract":"<div><div>Organic material (OM) decomposition is crucial to soil fertility. We evaluated the hypothesis that long-term manure application induces changes in soil properties which affect the decomposition of OM in the first three months. We buried standardized plant litter with different C/N ratios, i.e., green tea (high-quality OM) and rooibos tea (low-quality OM), in five long-term organic fertilization experiments across different soil types in Europe. Intact 100 cm³ soil cores and bulk soil around the buried OM were analyzed for soil properties, including the physicochemical environment (nutrient contents, pore structure, etc) and microbiological properties (biomass of arbuscular mycorrhizal fungi, saprophytic fungi, actinobacteria, Gram-positive and Gram-negative bacteria, and fluorescein diacetate [FDA] enzyme activity). Despite the difference in microbial growth and activity and soil pore structure between treatments and crops, the effect of manure on OM decomposition was inconsistent across the fields and varied with soil texture and standing crop species. Decomposition of high-quality OM was reduced by 5–7% in two sandy fields with manure treatment and that of low-quality OM was reduced by 22% in one silty manured field, while in the other fields, the decomposition was not affected by manure. The decomposition of both OM types was higher in the maize field than in the barley and grass fields in one sandy site. Clay content and electrical conductivity were negatively linked to the mass loss of both OM types. For the high-quality OM, its decomposition was also negatively linked to soil organic carbon and nutrient content, but positively linked to FDA enzyme activity. In contrast, the decomposition of low-quality OM was positively impacted by the bacterial biomass and soil total porosity. In conclusion, the effect of long-term manure application on OM decomposition depends on the soil texture and the standing crop species, and the edaphic drivers for OM decomposition vary with OM quality.</div></div>","PeriodicalId":21888,"journal":{"name":"Soil Biology & Biochemistry","volume":"202 ","pages":"Article 109711"},"PeriodicalIF":9.8,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142936685","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The soil microbial methylome: A tool to explore the role of epigenetic memory in driving soil abiotic legacy effects","authors":"Tom Sizmur ,&nbsp;Alexey Larionov","doi":"10.1016/j.soilbio.2025.109712","DOIUrl":"10.1016/j.soilbio.2025.109712","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":21888,"journal":{"name":"Soil Biology & Biochemistry","volume":"202 ","pages":"Article 109712"},"PeriodicalIF":9.8,"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":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Thermodynamics of microbial decomposition of persistent carbon in erosion-buried topsoils","authors":"A.D. Mitchell,&nbsp;B.L. Helgason","doi":"10.1016/j.soilbio.2025.109710","DOIUrl":"10.1016/j.soilbio.2025.109710","url":null,"abstract":"<div><div>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⁻¹ soil) similar to the corresponding Ah soil (30.9 mg OC g⁻¹ soil). Using isothermal calorimetry, we determined that Ah horizons produced significantly more heat and CO₂ but had smaller calorespirometric ratios than Ahb soils, under both basal (841 vs 3106 kJ mol⁻¹ CO₂–C) and glucose metabolism (627 vs. 697 kJ mol⁻¹ CO₂–C)0.100-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.</div></div>","PeriodicalId":21888,"journal":{"name":"Soil Biology & Biochemistry","volume":"202 ","pages":"Article 109710"},"PeriodicalIF":9.8,"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":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Context-dependent contributions of arbuscular mycorrhizal fungi to host performance under global change factors","authors":"Lennel Camuy-Velez ,&nbsp;Ditam Chakraborty ,&nbsp;Addisyn Young ,&nbsp;Sakshi Paudel ,&nbsp;Rylie Elvers ,&nbsp;Miranda Vanderhyde ,&nbsp;Kelly Walter ,&nbsp;Chantal Herzog ,&nbsp;Samiran Banerjee","doi":"10.1016/j.soilbio.2024.109707","DOIUrl":"10.1016/j.soilbio.2024.109707","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":21888,"journal":{"name":"Soil Biology & Biochemistry","volume":"204 ","pages":"Article 109707"},"PeriodicalIF":9.8,"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}

{"title":"Soil pH promoted respiration is stimulated by exoenzyme kinetic properties for a Pinus tabuliformis forest of northern China","authors":"Mengyao Xu ,&nbsp;Zhiyong Zhou ,&nbsp;Yinhua Guo ,&nbsp;Ying Shen ,&nbsp;Huan Zhang ,&nbsp;Qiang Yu","doi":"10.1016/j.soilbio.2025.109709","DOIUrl":"10.1016/j.soilbio.2025.109709","url":null,"abstract":"<div><div>The trends in 21st 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⁻² yr⁻¹ (N5, N10, N20, and N40) and lime at rates of 50, 100, 200, and 400 g m⁻² yr⁻¹ (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 CO₂ m⁻² s⁻¹ in N40 treatment to 2.36 CO₂ m⁻² s⁻¹ 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⁻¹·g⁻¹ SOM in N40 treatment to 66.80 nmol MUB·h⁻¹·g⁻¹ 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.</div></div>","PeriodicalId":21888,"journal":{"name":"Soil Biology & Biochemistry","volume":"202 ","pages":"Article 109709"},"PeriodicalIF":9.8,"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}

{"title":"Heterotrophic nitrification in soils: Approaches and mechanisms","authors":"Elizaveta P. Pulikova ,&nbsp;Andrey V. Gorovtsov ,&nbsp;Yakov Kuzyakov ,&nbsp;Konstantin A. Demin ,&nbsp;Tatiana M. Minkina ,&nbsp;Vishnu D. Rajput","doi":"10.1016/j.soilbio.2024.109706","DOIUrl":"10.1016/j.soilbio.2024.109706","url":null,"abstract":"<div><div>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 to 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. ¹⁵N 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 ¹⁵N 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 (¹³C, ¹⁵N); iii) combining fluorescence <em>in situ</em> hybridization with microautoradiography (¹⁴C) 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.</div></div>","PeriodicalId":21888,"journal":{"name":"Soil Biology & Biochemistry","volume":"202 ","pages":"Article 109706"},"PeriodicalIF":9.8,"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}

{"title":"Spatiotemporal dynamics of reactive oxygen species in the detritusphere and their critical roles in organic carbon mineralisation","authors":"Kangjie Yang ,&nbsp;Jinbo Liu ,&nbsp;Zhiqiang Wang ,&nbsp;Kecheng Zhu ,&nbsp;Bin Jia ,&nbsp;Huiqiang Yang ,&nbsp;Jianjun Qin ,&nbsp;Jia Xie ,&nbsp;Junaid Latif ,&nbsp;Fuhao Liu ,&nbsp;Yanpei Li ,&nbsp;Na Chen ,&nbsp;Hanzhong Jia","doi":"10.1016/j.soilbio.2024.109700","DOIUrl":"10.1016/j.soilbio.2024.109700","url":null,"abstract":"<div><div>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, O₂^•−; hydrogen peroxide, H₂O₂; and hydroxyl radical, ^•OH) in the detritusphere using a ROS-trapping agar gel, of which the contents gradually increased and then decreased with residue decay. Spatially, O₂^•− content gradually decreased with increasing distance from residue, whereas H₂O₂ content increased. Interestingly, the content of ^•OH increased from 3.2 to 4.3 μmol kg⁻¹ and decreased from 6.9 to 3.9 μmol kg⁻¹ with increasing distance from residue after incubation for 3 d and 24 d, respectively. Spearman correlation analysis revealed that O₂^•−production was closely related to the oxidation of water-soluble phenols by phenol oxidase. In contrast, H₂O₂ production correlated with microbial abundance, suggesting that microorganisms served as primary drivers of H₂O₂ production in the detritusphere. Results from incubation experiment suggest that the dominant drivers of ^•OH production shifted from Fe(II) to water-extractable organic carbon (WEOC) between day 3 and day 24 of residue decomposition. Furthermore, autoclaving reduced ^•OH content regardless of Fe(II) or WEOC presence, highlighting the important role of microorganism in ^•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 ^•OH and O₂^•− stimulated OC mineralisation by 15% and 4%, respectively, while H₂O₂ 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.</div></div>","PeriodicalId":21888,"journal":{"name":"Soil Biology & Biochemistry","volume":"202 ","pages":"Article 109700"},"PeriodicalIF":9.8,"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}

{"title":"Earthworms buffer the impacts of nitrogen enrichment on energy dynamics of soil micro-food webs","authors":"Bingbing Wan ,&nbsp;Andrew D. Barnes ,&nbsp;Mingyu Li ,&nbsp;Yuanyuan Song ,&nbsp;Qian Yang ,&nbsp;Xiaoyun Chen ,&nbsp;Feng Hu ,&nbsp;Manqiang Liu","doi":"10.1016/j.soilbio.2024.109705","DOIUrl":"10.1016/j.soilbio.2024.109705","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":21888,"journal":{"name":"Soil Biology & Biochemistry","volume":"202 ","pages":"Article 109705"},"PeriodicalIF":9.8,"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}

{"title":"Multitrophic interactions support belowground carbon sequestration through microbial necromass accumulation in dryland biocrusts","authors":"Jia Shi ,&nbsp;Lijia Lu ,&nbsp;Jingxi Zang ,&nbsp;Yuanze Sun ,&nbsp;Jianguo Tao ,&nbsp;Zelong Zhao ,&nbsp;Xiang Wang ,&nbsp;Jie Wang","doi":"10.1016/j.soilbio.2024.109708","DOIUrl":"10.1016/j.soilbio.2024.109708","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":21888,"journal":{"name":"Soil Biology & Biochemistry","volume":"202 ","pages":"Article 109708"},"PeriodicalIF":9.8,"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}

{"title":"Spatial heterogeneity of high-affinity H2 oxidation activity in agricultural soil profile","authors":"Lijun Hou ,&nbsp;Philippe Constant ,&nbsp;Joann K. Whalen","doi":"10.1016/j.soilbio.2024.109703","DOIUrl":"10.1016/j.soilbio.2024.109703","url":null,"abstract":"<div><div>Soil H₂ oxidizing bacteria metabolize H₂ 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 H₂ content and high-affinity H₂ oxidation activity in the soil profile (5 cm, 15 cm, and 35 cm) and between the soybean rhizosphere and bulk soil. We found the H₂ content declined exponentially with soil depth, but potential H₂ 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 H₂ and carbon likely facilitates mixotrophic growth of H₂ oxidizing bacteria in the rhizosphere.</div></div>","PeriodicalId":21888,"journal":{"name":"Soil Biology & Biochemistry","volume":"202 ","pages":"Article 109703"},"PeriodicalIF":9.8,"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}