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Trade-offs between arbuscular mycorrhizal symbiosis and root hairs in phosphorus source utilisation are determined by functional divergence of the rhizosphere bacterial microbiome in barley 大麦根际细菌微生物群的功能分化决定了丛枝菌根共生和根毛在磷源利用中的权衡
IF 9.7 1区 农林科学
Soil Biology & Biochemistry Pub Date : 2025-06-17 DOI: 10.1016/j.soilbio.2025.109887
Letian Wang, Jiachao Zhou, Timothy S. George, Gu Feng
{"title":"Trade-offs between arbuscular mycorrhizal symbiosis and root hairs in phosphorus source utilisation are determined by functional divergence of the rhizosphere bacterial microbiome in barley","authors":"Letian Wang, Jiachao Zhou, Timothy S. George, Gu Feng","doi":"10.1016/j.soilbio.2025.109887","DOIUrl":"https://doi.org/10.1016/j.soilbio.2025.109887","url":null,"abstract":"Plants strategically allocate their limited carbon resources between root hairs and arbuscular mycorrhizal (AM) fungi, balancing the two key phosphorus (P) uptake pathways. This enables the exploitation of alternative P sources, including organic P and inorganic P, depending on their bioavailability in the soil. These pathways closely interact and influence rhizosphere microbial dynamics. However, the mechanisms underlying trade-offs under varying qualitative and quantitative P source conditions and their relationship with the rhizosphere microbiome remain poorly understood. Here, a three-factorial experiment was conducted with barley (<em>Hordeum vulgare</em>) rhizotype (wild type/bold root barley root hairless mutant), AM fungal inoculation (+/-), and inorganic P addition (+/-), using soil amended with phytin as a model organic P compound. We combined <sup>13</sup>C-DNA stable isotope probing with 16S rRNA metabarcoding and root exudation analysis to explore the intricate interactions among root hairs, the AM symbiosis, and the bacterial rhizosphere microbiome in shaping plants’ P source exploitation. We found that barley employed a strategic trade-off between root hairs and the AM symbiosis, favoring the AM symbiosis under high organic P and root hairs under high inorganic P conditions. This trade-off is driven by the functional divergence of the AM symbiosis and root hairs in P acquisition: the AM symbiosis triggered bacterial organic P mineralization and raised alkaline phosphatase activity, whereas root hairs depleted the inorganic P pool. Both the AM symbiosis and root hairs shaped the bacterial microbiome by exudation of carboxylates, such as citrate. Notably, the functional specialization of the AM symbiosis to organic P-dominated soil was associated with a bacterial microbiome driving organic P mineralization. These findings advance our understanding of plant-AM fungal-soil microbiome interactions and highlight the importance of plant microbiome selection in P acquisition.","PeriodicalId":21888,"journal":{"name":"Soil Biology & Biochemistry","volume":"1 1","pages":""},"PeriodicalIF":9.7,"publicationDate":"2025-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144305385","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
Mineral-bound lipid formation in soils and sediments: the importance of microbial pathways 土壤和沉积物中矿物结合的脂质形成:微生物途径的重要性
IF 9.7 1区 农林科学
Soil Biology & Biochemistry Pub Date : 2025-06-16 DOI: 10.1016/j.soilbio.2025.109883
Hongye Pei, Huan Yang, Yakov Kuzyakov, Genming Luo, Xinyue Dang, Shucheng Xie
{"title":"Mineral-bound lipid formation in soils and sediments: the importance of microbial pathways","authors":"Hongye Pei, Huan Yang, Yakov Kuzyakov, Genming Luo, Xinyue Dang, Shucheng Xie","doi":"10.1016/j.soilbio.2025.109883","DOIUrl":"https://doi.org/10.1016/j.soilbio.2025.109883","url":null,"abstract":"Mineral protection is the most important mechanism for the long-term preservation of soil organic matter (SOM). However, the proportions of mineral-bound organic compounds, varying in chemical structures and biological origins, remain unclear, impeding a deeper understanding of the mechanisms underlying SOM-mineral interactions. Structurally diverse lipids such as fatty acids, tetraethers, and fatty alcohols are slowly decomposable biomarkers reflecting plant and microbial origin and, therefore, are good indicators for exploring the formation of organo-mineral associations. Here we used offline pyrolysis to quantify the mineral-bound lipids in aquatic sediments (i.e., lake and marine sediments) and soils with varying water content. Diverse microbial lipid types, such as monoalkyl glycerol ethers (MAGEs) and branched fatty acids, exhibited comparable mineral-binding proportions despite their structural differences. These microbial lipids generally showed higher proportions in mineral-bound forms compared to plant-derived lipids. This suggests that the biological origin of SOM may play a more significant role than chemical structure in the formation of organo-mineral associations. In addition, the proportion of bound microbial lipids was higher under drier conditions, whereas the proportion of bound plant-derived lipids was not affected by water content. We attributed this discrepancy to the different pathways through which microbial and plant lipids become mineral-bound, as microbes are more likely to attach to mineral surfaces under drier conditions, facilitating the formation of organo-mineral associations, while plant organic matter is adsorbed on the mineral surfaces after initial decomposition. This sheds new light on the microbial contribution to SOM stability, highlighting microbial physiology, especially hydrotaxis (water-directed movement), as a crucial biogeochemical factor in SOM stabilization.","PeriodicalId":21888,"journal":{"name":"Soil Biology & Biochemistry","volume":"6 1","pages":""},"PeriodicalIF":9.7,"publicationDate":"2025-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144305386","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
The Newly Proposed Threshold for Enzymatic Stoichiometry: A Reliable Solution? 新提出的酶化学计量阈值:一个可靠的解决方案?
IF 9.7 1区 农林科学
Soil Biology & Biochemistry Pub Date : 2025-06-16 DOI: 10.1016/j.soilbio.2025.109886
Taiki Mori
{"title":"The Newly Proposed Threshold for Enzymatic Stoichiometry: A Reliable Solution?","authors":"Taiki Mori","doi":"10.1016/j.soilbio.2025.109886","DOIUrl":"https://doi.org/10.1016/j.soilbio.2025.109886","url":null,"abstract":"The enzymatic stoichiometry approach assumes that microbial enzyme production reflects metabolic and stoichiometric demands; therefore, soil microbial nutrient limitations can be inferred from the activity levels of soil enzymes catalyzing compounds containing limiting nutrients. A vector model analysis further advanced this approach by proposing a 1:1:1 threshold for carbon (C), nitrogen (N), and phosphorus (P) limitations. However, this threshold has been criticized for lacking a solid theoretical foundation. To address this limitation, a novel method was recently introduced to establish a new threshold based on theoretical concepts. This new threshold was evidenced by the fact that the empirical threshold determined as the inflection point of the regression lines representing the relationship between vector angle and vector length corresponded with the theoretical values. Here, I demonstrated that this pattern can be generated using entirely random data, undermining the reliability of the conclusions. Furthermore, the theoretical foundation for determining the new threshold contains certain limitations, highlighting the need for an alternative threshold.","PeriodicalId":21888,"journal":{"name":"Soil Biology & Biochemistry","volume":"44 1","pages":""},"PeriodicalIF":9.7,"publicationDate":"2025-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144305387","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
Turnover of fungal glucosamine and bacterial muramic acid in comparison with soil organic carbon in two arable soils with distinct fungal communities 两种不同真菌群落耕地土壤中真菌氨基葡萄糖和细菌菌胺的周转与土壤有机碳的比较
IF 9.7 1区 农林科学
Soil Biology & Biochemistry Pub Date : 2025-06-16 DOI: 10.1016/j.soilbio.2025.109889
Rainer Georg Joergensen, Florian Wichern
{"title":"Turnover of fungal glucosamine and bacterial muramic acid in comparison with soil organic carbon in two arable soils with distinct fungal communities","authors":"Rainer Georg Joergensen, Florian Wichern","doi":"10.1016/j.soilbio.2025.109889","DOIUrl":"https://doi.org/10.1016/j.soilbio.2025.109889","url":null,"abstract":"Microbial necromass carbon (MNC) can contribute 50% or more to soil organic C (SOC) and may thus be crucial for C sequestration in soil. However, it is not known how persistent MNC is and whether the turnover of fungal and bacterial necromass C differs from that of SOC in this respect. The current study therefore investigates the turnover times of fungal glucosamine (GlcN) and bacterial muramic acid (MurN) in two soils from the long-term Darmstadt fertilization trial with distinct fungal communities. The soil with inorganic fertilization and straw return (MIN) contains significantly more saprotrophic fungi than the organically managed soil with cattle farmyard manure fertilization (FYM). The soil organic carbon (SOC) turnover time was 10.0 years in the FYM soil, 16% longer than the 8.6 years in the MIN soil. In contrast, the microbial biomass C (MBC) turnover time of 147 days in the FYM soil was more than twice the 67 days found in the MIN soil. The turnover time of fungal GlcN and MurN varied around 6.3 years in the FYM soil and around 4.9 years in the MIN soil. In contrast to plant residues, fungal GlcN and MurN are constantly recycled in the microbial biomass during growth, which results in shorter turnover times compared to SOC. The different conversion factors from amino sugars to necromass currently used have only minor effects on the estimates of turnover times. The main drivers for the turnover of MBC and MNC in soil are microbial C use efficiency (CUE) and C input. There is particularly a serious lack in knowledge on the CUE values of partly decomposed organic fertilizers such as FYM. Future studies also need to more accurately estimate quantity and quality of the C input by straw, harvest residues, roots, rhizodeposits, and organic fertilizers.","PeriodicalId":21888,"journal":{"name":"Soil Biology & Biochemistry","volume":"31 1","pages":""},"PeriodicalIF":9.7,"publicationDate":"2025-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144296303","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
Genetic lineages and ecological gradients co-determine the trophic niches of earthworms 遗传谱系和生态梯度共同决定蚯蚓的营养生态位
IF 9.7 1区 农林科学
Soil Biology & Biochemistry Pub Date : 2025-06-14 DOI: 10.1016/j.soilbio.2025.109884
Tingting Xiao, Zhili Feng, Zhuoma Wan, Bing Zhang, Olaf Schmidt, Donghui Wu, Yahya Kooch
{"title":"Genetic lineages and ecological gradients co-determine the trophic niches of earthworms","authors":"Tingting Xiao, Zhili Feng, Zhuoma Wan, Bing Zhang, Olaf Schmidt, Donghui Wu, Yahya Kooch","doi":"10.1016/j.soilbio.2025.109884","DOIUrl":"https://doi.org/10.1016/j.soilbio.2025.109884","url":null,"abstract":"Trophic niche partitioning is a fundamental mechanism explaining species coexistence and diversity. Trophic niches vary with elevational gradients, but the consequences of genetic divergence for trophic niche shifts are little studied in particular for belowground communities. Many earthworm species comprise various genetic lineages, however, the trophic niche variations of these co-existing lineages under gradually changing environmental conditions is still unknown. This study barcoded 280 individuals of earthworm <em>Eisenia nordenskioldi</em> sampled from an elevational gradient (800–1700 m) on Changbai Mountain in northeastern China and divided them into two lineages (i.e., large and small bodied). Using normalized stable isotope ratios (Δ), we evaluated the trophic niche shifts of the two distinct lineages across seven elevations. The results showed that genetic lineage and elevation together explained the variations of isotopic compositions (72.9% for Δ<sup>13</sup>C and 95.4% for Δ<sup>15</sup>N). Ignoring the elevations, the two lineages showed no significant difference in their trophic niches (P &gt; 0.05) with a 27% of overlap; while when they co-occurred at certain elevations, the two lineages overlapped by 7–24% in trophic niches, and showed significant differences. The trophic niche sizes of two lineages changed significantly but in an opposite way with elevations. The significant differences in trophic niches indicated that the two lineages had different physiologies, supporting their status as cryptic species. For both lineages, the Δ<sup>13</sup>C values showed a hump-shaped relationship with body mass, while the Δ<sup>15</sup>N values decreased linearly with body mass; litter C/N ratio and soil moisture explained variations of Δ<sup>13</sup>C values, and litter C/N ratio and soil pH explained the variations of Δ<sup>15</sup>N values. Overall, the findings highlight the power of integrating the genetic and ecological information and the novel fact that intraspecific variations in trophic traits can be of similar importance to those among different species when evaluating the responses to environmental changes.","PeriodicalId":21888,"journal":{"name":"Soil Biology & Biochemistry","volume":"70 1","pages":""},"PeriodicalIF":9.7,"publicationDate":"2025-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144288618","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
Microbial metabolisms determine soil priming effect induced by organic inputs 微生物代谢决定了有机投入引起的土壤启动效应
IF 9.7 1区 农林科学
Soil Biology & Biochemistry Pub Date : 2025-06-14 DOI: 10.1016/j.soilbio.2025.109885
Yingyi Fu, Wanling Liu, Zhiyi Chen, Marc Redmile-Gordon, Chao Liang, Caixian Tang, Georg Guggenberger, Shaobin Yan, Liming Yin, Jingjing Peng, Lukas Van Zwieten, Peng Wang, Ji Chen, Yakov Kuzyakov, Tida Ge, Jianming Xu, Yu Luo
{"title":"Microbial metabolisms determine soil priming effect induced by organic inputs","authors":"Yingyi Fu, Wanling Liu, Zhiyi Chen, Marc Redmile-Gordon, Chao Liang, Caixian Tang, Georg Guggenberger, Shaobin Yan, Liming Yin, Jingjing Peng, Lukas Van Zwieten, Peng Wang, Ji Chen, Yakov Kuzyakov, Tida Ge, Jianming Xu, Yu Luo","doi":"10.1016/j.soilbio.2025.109885","DOIUrl":"https://doi.org/10.1016/j.soilbio.2025.109885","url":null,"abstract":"Soil microorganisms are essential in determining soil organic carbon (C) decomposition via the priming effect. However, the understanding of microbial-driven priming effects is hampered by the poor understanding of microbial metabolisms in response to different organic inputs. Based on a meta-analysis encompassing 449 experimental comparisons globally, we investigated the differences in priming effects induced by two types of substrates: sugars and lipids. Coupled with the stable isotope probing combined with metagenomics (SIP-metagenomics), an incubation with <sup>13</sup>C-labeled glucose or glycerol (proxy of sugar or lipid products) was further conducted to investigate the priming effect and the underlying microbial mechanisms, e.g., the core bacteria taxa and their metabolism. Firstly, meta-analysis showed, at a global scale, sugars induced a significantly higher priming effect compared to lipids. Secondly, incubation experiments with these low-molecular-weight substrates further demonstrated that sugar-derived compounds stimulated greater bacterial diversity and enriched genes encoding glycoside hydrolases, resulting in a stronger priming effect. In contrast, bacterial communities utilizing lipid-derived compounds were dominated by <em>Bacillus</em> species, exhibiting genes associated with metabolite synthesis processes (e.g., glycosyl transferases, GTs) while concurrently depleting genes related to extracellular enzyme production (e.g., glycoside hydrolases, GHs), which collectively resulted in a weaker priming effect. This study underscores that the substrate selected bacteria taxa and their metabolisms, particularly the balance between anabolism and catabolism, play a key role in regulating the magnitude of the priming effect.","PeriodicalId":21888,"journal":{"name":"Soil Biology & Biochemistry","volume":"71 1","pages":""},"PeriodicalIF":9.7,"publicationDate":"2025-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144288463","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
Erratum to ‘Probing the pump: Soil carbon dynamics, microbial carbon use efficiency and community composition in response to stoichiometrically-balanced compost and biochar’ [Soil Biol. Biochem. 205 (2025), 109770] “探测泵:土壤碳动态,微生物碳利用效率和群落组成对化学计量平衡的堆肥和生物炭的响应”[土壤生物学]。生物化学学报,2015 (5),357 - 357 [j]
IF 9.7 1区 农林科学
Soil Biology & Biochemistry Pub Date : 2025-06-12 DOI: 10.1016/j.soilbio.2025.109874
George D. Mercer, Bede S. Mickan, Deirdre B. Gleeson, Evonne Walker, Christian Krohn, Christopher H. Bühlmann, Megan H. Ryan
{"title":"Erratum to ‘Probing the pump: Soil carbon dynamics, microbial carbon use efficiency and community composition in response to stoichiometrically-balanced compost and biochar’ [Soil Biol. Biochem. 205 (2025), 109770]","authors":"George D. Mercer, Bede S. Mickan, Deirdre B. Gleeson, Evonne Walker, Christian Krohn, Christopher H. Bühlmann, Megan H. Ryan","doi":"10.1016/j.soilbio.2025.109874","DOIUrl":"https://doi.org/10.1016/j.soilbio.2025.109874","url":null,"abstract":"The publisher regrets &lt; The subscripts and superscripts in the abstract have now been formatted correctly&gt;.","PeriodicalId":21888,"journal":{"name":"Soil Biology & Biochemistry","volume":"15 1","pages":""},"PeriodicalIF":9.7,"publicationDate":"2025-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144268855","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
Microbial starch degradation in arid soil: Community dynamics, environmental influences, and archaeological implications 干旱土壤中的微生物淀粉降解:群落动态、环境影响和考古意义
IF 9.8 1区 农林科学
Soil Biology & Biochemistry Pub Date : 2025-06-09 DOI: 10.1016/j.soilbio.2025.109882
Tolutope Akeju , Andriy Sheremet , Angela V. Smirnova , Daniel Yakimenka , Jamie Lee-Inwood , María Soto , Abdallah M. Nganyalila , Aloyce Mwambwiga , Julio Mercader , Peter F. Dunfield
{"title":"Microbial starch degradation in arid soil: Community dynamics, environmental influences, and archaeological implications","authors":"Tolutope Akeju ,&nbsp;Andriy Sheremet ,&nbsp;Angela V. Smirnova ,&nbsp;Daniel Yakimenka ,&nbsp;Jamie Lee-Inwood ,&nbsp;María Soto ,&nbsp;Abdallah M. Nganyalila ,&nbsp;Aloyce Mwambwiga ,&nbsp;Julio Mercader ,&nbsp;Peter F. Dunfield","doi":"10.1016/j.soilbio.2025.109882","DOIUrl":"10.1016/j.soilbio.2025.109882","url":null,"abstract":"<div><div>Starch is the primary energy storage compound in plants, and the most important carbohydrate in the human diet. Intact starch granules have been found in archaeological contexts, suggesting that starch may be recalcitrant to degradation in certain conditions. We identified microbial communities that degraded tuber starch in arid soils from Oldupai Gorge, Tanzania, and assessed their dependence on moisture, O<sub>2</sub>, and starch purity. Laboratory soil microcosms were amended with ground native <em>Ipomoea longituba</em> tubers or purified starch from <em>Solanum tuberosum</em> (common potato), which both contain starches of B-type crystallinity. Sequencing of 16S rRNA and 18S rRNA genes, DNA-stable isotope probing with <sup>13</sup>C labelled starch, and metagenomic analysis of amylases all indicated that starch was metabolised by diverse bacteria belonging mostly to the phyla <em>Actinomycetota</em> and <em>Bacillota (Firmicutes)</em>, and by <em>Ascomycota</em> fungi. Some of the starch-degrading <em>Actinomycetota</em> were also enriched in the rhizosphere of field <em>Ipomoea longituba</em> plants. Some microbes responded to both substrates, while others responded only to one. Members of the genus <em>Streptomyces</em> were stimulated by potato starch but not <em>Ipomoea longituba</em> tuber material, while members of the genus <em>Bacillus</em> were stimulated by <em>Ipomoea longituba</em> tuber but not potato starch. The use of purified starch in experiments therefore did not fully reproduce the complex interactions between plant-derived starch and soil microbial communities. Although starch purity, soil moisture and pO<sub>2</sub>, and microbial community all affected starch metabolism, visible starch granules were always rapidly destroyed, even when subsequent respiration of the starch material was severely limited. Native <em>Ipomoea longituba</em> starch granules were destroyed within a few days in all treatments. Our results therefore suggest that long-term preservation of native, unmodified starch granules in soils over long time periods is unlikely even under very dry conditions. These results provide some guidance for designing future studies into starch preservation mechanisms.</div></div>","PeriodicalId":21888,"journal":{"name":"Soil Biology & Biochemistry","volume":"209 ","pages":"Article 109882"},"PeriodicalIF":9.8,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144252705","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
Rhizosphere – detritusphere interactions stabilize soil carbon depending on plant litter traits 根际-碎屑层的相互作用对土壤碳的稳定取决于植物凋落物的特征
IF 9.8 1区 农林科学
Soil Biology & Biochemistry Pub Date : 2025-06-04 DOI: 10.1016/j.soilbio.2025.109875
Bingbing Wan , Yakov Kuzyakov , Xiaoyun Chen , Feng Hu , Joann K. Whalen , Manqiang Liu
{"title":"Rhizosphere – detritusphere interactions stabilize soil carbon depending on plant litter traits","authors":"Bingbing Wan ,&nbsp;Yakov Kuzyakov ,&nbsp;Xiaoyun Chen ,&nbsp;Feng Hu ,&nbsp;Joann K. Whalen ,&nbsp;Manqiang Liu","doi":"10.1016/j.soilbio.2025.109875","DOIUrl":"10.1016/j.soilbio.2025.109875","url":null,"abstract":"<div><div>Plant litter, the dominant source of soil organic carbon (SOC), enters as aboveground plant residues or belowground as rhizodeposition, forming hotspots of microbial SOC formation within the detritusphere and rhizosphere. The knowledge of microbial metabolism in these two hotspots help to reconcile much of the debate and contradictory evidence about litter effects on SOC stabilization. To investigate how rhizosphere–detritusphere interactions impact SOC formation, we quantified the particulate organic C (POC) and mineral-associated organic C (MAOC) pools in a field experiment receiving aboveground litter additions from six plant species varying in their litter quality. Rhizosphere effects, defined here as the activity around living roots compared to the soil with decomposing litter (detritusphere), on microbial biomass and activity increased with decreasing litter quality (high C:N ratio), reflecting a strategy in which plant roots acquire nutrients through interactions with rhizosphere microbes. Low-quality (high C:N) litter decreased the POC content in rhizosphere by 21 % but raised the MAOC content by 17 % relative to detritusphere, increasing the MAOC portion in SOC by 13 %. The rhizosphere effect on POC and MAOC pools was absent when high-quality (low C:N) litter was applied, presumably because the microbially-mediated nutrient release by mineralization matched the plant demands. These results indicate that rhizosphere effect contributed to more stable SOC than corresponding detritusphere under low-quality litter inputs, partly due to the efficient MAOC formation by rhizosphere microorganisms. Consequently, the interactive effects between rhizosphere and detritusphere on SOC pools crucially depend on litter traits, directing soil microbial efficiency and nutrient cycling.</div></div>","PeriodicalId":21888,"journal":{"name":"Soil Biology & Biochemistry","volume":"209 ","pages":"Article 109875"},"PeriodicalIF":9.8,"publicationDate":"2025-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144211086","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
Deciphering the microbial players driving straw decomposition and accumulation in soil components of particulate and mineral-associated organic matter 解读驱动秸秆分解和土壤中颗粒和矿物相关有机物成分积累的微生物参与者
IF 9.8 1区 农林科学
Soil Biology & Biochemistry Pub Date : 2025-06-04 DOI: 10.1016/j.soilbio.2025.109871
Yingyi Fu , Yuqi Xu , Qiang Wang , Lukas Van Zwieten , Chao Liang , Jianming Xu , Georg Guggenberger , Yu Luo
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