Soil Biology & Biochemistry最新文献

{"title":"Trait-based Modeling of Microbial Interactions and Carbon Turnover in the Rhizosphere","authors":"Ahmet Kürşad Sırcan, Thilo Streck, Andrea Schnepf, Mona Giraud, Adrian Lattacher, Ellen Kandeler, Christian Poll, Holger Pagel","doi":"10.1016/j.soilbio.2024.109698","DOIUrl":"https://doi.org/10.1016/j.soilbio.2024.109698","url":null,"abstract":"Understanding the feedback mechanisms between roots and soil, and their effects on microbial communities, is crucial for predicting carbon cycling processes in agroecosystems. Process-based modeling is a valuable tool for quantifying biogeochemical processes and identifying regulatory mechanisms in the rhizosphere. A novel one-dimensional axisymmetric rhizosphere model is used to simulate the spatially resolved dynamics of microorganisms and soil organic matter turnover around a single root segment. The model accounts for two functional groups with different life history strategies (copiotrophs and oligotrophs), reflecting trade-offs in functional microbial traits related to substrate utilization and microbial metabolism. It considers differences in the accessibility of soil organic matter by including the microbial utilization of low and high molecular weight organic carbon compounds (LMW-OC, HMW-OC). The model was conditioned using Bayesian inference with constraint-based parameter sampling, which enabled the identification of parameter sets resulting in plausible model predictions in agreement with experimental evidence.Mimicking the behavior of growing roots, the model assumed 15 days of rhizodeposition for LMW-OC. The simulations show a decreasing pattern of dissolved LMW-OC away from the root surface. We observed a dominance of copiotrophs close to the root surface (0-0.1 mm). Spatial patterns of functional microbial groups persisted after rhizodeposition ended, indicating a legacy effect of rhizodeposition on microbial communities, particularly on oligotrophic activity. Simulated microbial biomass exhibits a very rapid change within 0-0.2 mm away from the root surface, which points to the importance of resolving soil properties and states at sub-millimeter resolution. Microbial-explicit rhizosphere modeling thus facilitates elucidating spatiotemporal patterns of microorganisms and carbon turnover in the rhizosphere. The identified legacy effect of rhizodeposition on soil microorganisms might be leveraged for rhizosphere-based carbon stabilization strategies in agroecosystems.","PeriodicalId":21888,"journal":{"name":"Soil Biology & Biochemistry","volume":"31 1","pages":""},"PeriodicalIF":9.7,"publicationDate":"2024-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142867067","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":"Climate outweighs fertiliser effects on soil phoD-harbouring communities in agroecosystems","authors":"Lin Xu, Yongping Kou, Qian Mao, Xiangzhen Li, Chaonan Li, Bo Tu, Jiabao Li, Lihua Tu, Lixia Wang, Hongwei Xu, Chengming You, Han Li, Sining Liu, Li Zhang, Bo Tan, Jiao Li, Yaling Yuan, Kai Wei, Zhenfeng Xu","doi":"10.1016/j.soilbio.2024.109697","DOIUrl":"https://doi.org/10.1016/j.soilbio.2024.109697","url":null,"abstract":"Alkaline phosphatase (<em>phoD</em>) gene-encoding bacterial (<em>phoD</em>-harbouring) communities are crucial for organic phosphorus (P) mineralisation in agroecosystems. However, the relative contributions of natural factors (e.g., climate) and anthropogenic influences (e.g., fertilisation) to these communities remain unclear, particularly at large spatial scales. To address this, we analysed <em>phoD</em> amplicon sequence data from 290 samples across 15 independent cropland studies, spanning diverse climatic zones and soil types from central to eastern Asia. Our results reveal that climatic factors exert stronger effects than fertiliser regimes on soil <em>phoD</em>-harbouring communities. Specifically, the richness of soil <em>phoD</em>-harbouring communities decreased by approximately three times as mean annual precipitation increased from 160 mm to 1800 mm, and mean annual temperature rose from 9°C to 18°C. Compared to the control, chemical nitrogen (N) + P + organic fertiliser doubled richness, while the control’s richness was 10 times higher than that of chemical N + P + potassium fertiliser. Alphaproteobacteria, Betaproteobacteria, and Gammaproteobacteria were the most dominant <em>phoD</em>-harbouring taxa, collectively accounting for 65.3% of the relative abundance. Precipitation explained up to 96.3% of the variance in community composition, while fertiliser regimes explained approximately 40%. Notably, excessive potassium fertilisation was linked to reduced richness and abundance of dominant <em>phoD</em>-harbouring taxa, potentially limiting the availability of plant-accessible P. This suggests that the amount of potassium fertiliser should be carefully considered in future agricultural practices, as it may reduce plant-available P by inhibiting soil <em>phoD</em>-harbouring communities.","PeriodicalId":21888,"journal":{"name":"Soil Biology & Biochemistry","volume":"76 1","pages":""},"PeriodicalIF":9.7,"publicationDate":"2024-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142841524","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":"Drivers of soil fauna communities along a successional gradient in upper Andean tropical forests","authors":"Camilo Castillo-Avila, Dennis Castillo-Figueroa, Juan M. Posada","doi":"10.1016/j.soilbio.2024.109692","DOIUrl":"https://doi.org/10.1016/j.soilbio.2024.109692","url":null,"abstract":"Soils harbor more than half of Earth's biodiversity, with soil fauna representing one of the most diverse groups. However, understanding the drivers influencing their biodiversity remains limited. Upper Andean tropical forests are among Earth's most biodiverse ecosystems, but have undergone large-scale historical transformations, resulting in landscapes with different forest successional stages. In this study, we aimed to analyze soil fauna communities along a successional gradient in Colombia's Eastern Andean forests and identify key microclimatic, soil, and forest structural drivers. We collected soil fauna from 168 samples (30x30x5 cm), in dry and wet seasons, in 14 permanent plots (20x20 m) located in four sites. Data on microclimate, nutrients, productivity, plant diversity, and litter functional richness were gathered from these permanent plots. We observed significant soil fauna biodiversity turnover among Andean montane forest sites, mirroring the distinctive floristic composition between them. We also found that soil fauna richness and abundance increased with succession, attributed to higher productivity and more suitable microclimatic conditions in old-growth forests. Our findings suggest that the primary driver of soil fauna richness in tropical mountain Andean forests is the amount of energy (i.e, forest productivity), while soil fauna abundance is mainly influenced by thermal conditions. Additionally, factors framed within the physiological tolerance hypothesis (i.e., calcium, aluminum) and within the habitat heterogeneity hypothesis (i.e., litter functional richness, plant diversity) also play a role, albeit to a lesser extent. This study emphasizes the importance of examining forest recovery including soil fauna groups to understand successional patterns in tropical mountain forests.","PeriodicalId":21888,"journal":{"name":"Soil Biology & Biochemistry","volume":"12 1","pages":""},"PeriodicalIF":9.7,"publicationDate":"2024-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142823367","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":"On the diversity of nematode antagonists in an agricultural soil, and their steerability by root-knot nematode density and cover crops","authors":"Sara G. Cazzaniga, Philippe Belliard, Joris van Steenbrugge, Sven van den Elsen, Carin Lombaers, Johnny Visser, Leendert Molendijk, Jose G. Macia-Vicente, Joeke Postma, Liesje Mommer, Johannes Helder","doi":"10.1016/j.soilbio.2024.109693","DOIUrl":"https://doi.org/10.1016/j.soilbio.2024.109693","url":null,"abstract":"Plant-parasitic nematodes are harmful pathogens for many agricultural crops. Within this category, root-knot nematodes (RKN, <em>Meloidogyne</em> spp.) are worldwide regarded as the most impactful because of their wide geographical distribution and their polyphagous nature. Host plant resistances against RKN have been successfully introduced in a few crops only. As the use of nematicides is becoming increasingly restricted because of environmental and human health concerns, there is a need for alternative strategies to control RKN. One such approach is the stimulation of local nematode antagonists. We investigated this in an experimental field setting with two main variables: density of the Columbia root-knot nematode <em>Meloidogyne chitwoodi</em>, and the type of cover crop. For each of the three <em>M. chitwoodi</em> densities, the effects of ten cover crop treatments were tested on both the resident (DNA) and the active (RNA) fractions of the bacterial and fungal communities. In our analyses, we focused on changes in the abundance of plant-parasitic nematode antagonists. From the eight bacterial and 26 fungal genera known from global literature to harbour potential antagonists of plant-parasitic nematodes, we detected respectively five and 14 genera in our agricultural field. Among the bacterial genera, four genera were shown to comprise bacterial species for which nematode antagonism has been documented. The fungal genera included facultative nematode parasites (<em>e.g</em>., <em>Arthrobotrys</em> spp.), endophytes strengthening host defences (<em>e.g</em>., <em>Acremonium</em> spp.), as well as multiple obligatory nematophagous species. This study revealed that conventionally managed arable fields may harbour an unexpectedly high diversity of nematode antagonists. Multiple antagonists were stimulated by cover crops in a cover crop-specific manner, and, to a lesser extent, by increased RKN densities. The richness in putative nematode antagonists did not translate into <em>M. chitwoodi</em> suppression, and we currently investigating whether this relates to the facultative nematophagous lifestyle of most of these antagonists.","PeriodicalId":21888,"journal":{"name":"Soil Biology & Biochemistry","volume":"85 1","pages":""},"PeriodicalIF":9.7,"publicationDate":"2024-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142823366","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":"Depth-dependent regulations of soil priming effects along a 2000 km grassland transect","authors":"Yunlong Hu, Jiguang Feng, Shuai Zhang, Zhongkui Luo, Biao Zhu","doi":"10.1016/j.soilbio.2024.109696","DOIUrl":"https://doi.org/10.1016/j.soilbio.2024.109696","url":null,"abstract":"Global change may change plant carbon input, which may in turn accelerate or retard the mineralization of soil organic matter (SOM), a phenomenon known as priming effect. However, deep soil priming effect on large geographic scale is poorly understood, hindering a complete understanding of the response of whole-soil carbon dynamics to plant carbon input. Across a 2000 km grassland transect in Inner Mongolia, China, this study showed that soil priming effects at 0-200 cm depth varied systematically with climate and soil properties. The intensity of priming effect varied with depth. Averaged across 10 sites along the transect, glucose addition increased native SOM decomposition by 5.1% in surface soil (0-10 cm), while decreased it by 12.9% and 25.7% in middle (30-50 cm) and deep (150-200 cm) soils, respectively. Interestingly, the regulating factors of priming at different depths were significantly different. The priming effect in surface soil was primarily regulated by SOM stability represented by content of soil minerals and (clay+silt) %, whereas that in middle soil was mainly regulated by soil substrates, SOM stability and soil pH, and that in deep soil was mainly controlled by soil substrates. This study demonstrates distinct controls of the priming effect across soil depths at the regional scale, and contributes to improving our understanding of how whole-soil carbon dynamics respond to global change.","PeriodicalId":21888,"journal":{"name":"Soil Biology & Biochemistry","volume":"10 1","pages":""},"PeriodicalIF":9.7,"publicationDate":"2024-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142823364","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":"Evidence of the need for crop-specific N2O emission factors","authors":"Akeem T. Shorunke, Bobbi L. Helgason, Richard E. Farrell","doi":"10.1016/j.soilbio.2024.109694","DOIUrl":"https://doi.org/10.1016/j.soilbio.2024.109694","url":null,"abstract":"Crop residues are an important source of N for subsequent crops and contribute to cropping system nitrous oxide (N₂O) emissions. Oilseed residues, particularly canola (<em>Brassica napus</em> L.), can instigate higher N₂O emissions compared to pulse and wheat crop residues but the reason for this disproportionate emission response is unknown. To determine the quantity and source of N₂O emissions, we conducted an incubation experiment (84 d) using ¹⁵N and ¹³C labelled residues of canola, wheat ,flax, pea and investigated key N-cycling gene abundances, microbial abundance and community structure using PLFA and soil C and N dynamics. Residue addition of all types significantly increased microbial abundance and abundances of denitrification and nitrification genes. Canola residue resulted in significantly greater <em>nosZI</em> abundance. Lower incorporation of canola residue ¹³C into PLFA and higher ¹³CO₂ emissions suggests that canola residue C was used less efficiently (i.e., less for growth and more for respiration), depleting O₂ and stimulating denitrification. The magnitude of N₂O emission from residue-amended soils was significantly higher (<em>p &lt;</em> 0.05) than the unamended control soil and differed with residue type: canola &gt; pea = wheat &gt; flax &gt; control. The canola residue emission factor was 1.56% of residue N – significantly higher than that of wheat (0.99%), pea (0.95%) and flax (0.18%). This higher canola emission factor resulted from greater residue-derived (1.47%) N₂O as well as residue-induced (0.65%) soil emissions. The combined use of stable isotope tracing of ¹⁵N₂O and ¹³CO₂ and microbial characterization quantified differences in residue-derived N₂O emissions from common crops that were linked to differences in microbial abundance, community structure and activity.","PeriodicalId":21888,"journal":{"name":"Soil Biology & Biochemistry","volume":"14 1","pages":""},"PeriodicalIF":9.7,"publicationDate":"2024-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142823365","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":"Increase in mineral-associated organic carbon does not offset the decrease in particulate organic carbon under long-term nitrogen enrichment in a steppe ecosystem","authors":"Li Liu, Junjie Yang, Jing Wang, Qiang Yu, Cunzheng Wei, Liangchao Jiang, Jianhui Huang, Yunhai Zhang, Yong Jiang, Haiyang Zhang, Xingguo Han","doi":"10.1016/j.soilbio.2024.109695","DOIUrl":"https://doi.org/10.1016/j.soilbio.2024.109695","url":null,"abstract":"Nitrogen (N) deposition significantly impacts ecosystem carbon (C) cycling. However, most experimental N deposition studies applied N fertilizers in low-frequency, typically once or twice per year during the growing season. Few studies have been conducted to investigate the effects of high-frequency N deposition at varying rates on the formation and stability of soil organic carbon (SOC). Additionally, the effects of N addition on the two SOC fractions — particulate organic carbon (POC) and mineral-associated organic carbon (MAOC) — and the underlying mechanisms are not well understood. To address these gaps, we conducted a long-term N addition experiment in a typical steppe ecosystem in Inner Mongolia, China, beginning in 2008. The N addition rates ranged from 0 to 50 g N m^-2 yr^-1, with a high frequency of N additions (once a month, 12 additions per year). After a decade of N addition, we observed a consistent decrease in SOC (by 3.9 ± 0.51 %) and POC (by 17.5 ± 2.31 %) and an increase in MAOC (by 5.8 ± 1.68 %) compared to the control treatment (i.e., the treatment without N addition). The decline in POC was attributed to stimulated microbial decomposition due to improved quality of particulate organic matter and increased priming effect from SOC. The increase in MAOC was associated with enhanced mineral protection, resulting from increased solubility of iron/aluminum (Fe/Al) that are reactive in directly adsorbing SOC molecules to form stable metal-SOC complexes. However, this increase in MAOC does not offset the decrease in POC, leading to an overall decrease in SOC under N enrichment. This study reveals the crucial roles of microbial decomposition and mineral protection in determining SOC fractions in N-enriched steppe ecosystems.","PeriodicalId":21888,"journal":{"name":"Soil Biology & Biochemistry","volume":"35 1","pages":""},"PeriodicalIF":9.7,"publicationDate":"2024-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142823362","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":"First microscale data on depth profiles of microbial N₂O reduction, O2 availability, and pore networks inside contrasting single soil aggregates","authors":"S. Mitsunobu, R. Wagai, H. Shimada, H. Kato, K. Ito, S. Sato, M. Hayatsu, K. Minamisawa","doi":"10.1016/j.soilbio.2024.109684","DOIUrl":"https://doi.org/10.1016/j.soilbio.2024.109684","url":null,"abstract":"A major greenhouse gas, nitrous oxide (N₂O) significantly emitted from agricultural soils, is reduced to innocuous N₂ gas by the activity of two groups of N₂O-reducing microbes (typical clade I and more recently discovered atypical clade II) having different enzymatic efficiency. Yet, basic information such as the locations of N₂O reduction hotspots and soil factors regulating their formations is still lacking. In addition, oxygen availability, which is strongly constrained by soil pore property, likely dictates their ecology in soil as N₂O reductase enzyme (coded by <em>nosZ</em> genes) is inhibited by O₂. Accordingly, the aim of this study was to assess the mechanistic linkage among soil pore networks, chemical microenvironments (pH, Eh, and O₂ and N₂O abundances), ecology of N₂O-reducing microbes, and the occurrence of N₂O reduction hotspots in single soil aggregates. Using water-stable macroaggregates from two contrasting soil types (highly porous Andosol and less porous clay-rich Acrisol), we determined microscale depth profiles of N₂O and O₂ dynamics, three-dimensional pore properties, and the two N₂O reducer populations in the single aggregates after 48-hour lab incubation under a water-saturated condition. The N₂O and O₂ depth profiles showed the increase in N₂O production with O₂ depletion towards deeper part of the incubated aggregates, indicating denitrification N₂O production especially in Andosol aggregate where O₂ availability was higher. The gene distribution with depth clearly showed higher abundance of <em>nosZ</em> harboring microbes (including both clades I and II) in the Acrisol aggregate than Andosol aggregate especially towards the aggregate interior. In the Acrisol aggregate, the abundance of <em>nosZ</em> clade I harboring microbes was maximum at the middle depth corresponding to N₂O maxima, whereas the <em>nosZ</em> clade II harboring microbes had slightly different niche as their population monotonically increased towards the aggregate core, which were consistent with theoretical O₂ availability and pore connectivity. The current findings underscore the intimate connection between soil physical complexity and microbial ecology, which merits further investigation.","PeriodicalId":21888,"journal":{"name":"Soil Biology & Biochemistry","volume":"28 1","pages":""},"PeriodicalIF":9.7,"publicationDate":"2024-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142809591","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":"Coupling energy balance and carbon flux during cellulose degradation in arable soils","authors":"Johannes Wirsching, Martin-Georg Endress, Eliana Di Lodovico, Sergey Blagodatsky, Christian Fricke, Marcel Lorenz, Sven Marhan, Ellen Kandeler, Christian Poll","doi":"10.1016/j.soilbio.2024.109691","DOIUrl":"https://doi.org/10.1016/j.soilbio.2024.109691","url":null,"abstract":"Microbial carbon use efficiency (CUE) is an important metric for understanding the balance between anabolic and catabolic metabolism, while energy use efficiency (EUE) provides insight into microbial energy requirements. They are linked by the ratio between released heat and respiration (calorespirometric ratio, CR), which can be used to describe the efficiency of microbial growth. In this study, microbial C and energy use during the degradation of &lt;span&gt;&lt;span style=\"\"&gt;&lt;/span&gt;&lt;span data-mathml='&lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\" /&gt;' role=\"presentation\" style=\"font-size: 90%; display: inline-block; position: relative;\" tabindex=\"0\"&gt;&lt;svg aria-hidden=\"true\" focusable=\"false\" height=\"0.24ex\" role=\"img\" style=\"vertical-align: -0.12ex;\" viewbox=\"0 -51.7 0 103.4\" width=\"0\" xmlns:xlink=\"http://www.w3.org/1999/xlink\"&gt;&lt;g fill=\"currentColor\" stroke=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"&gt;&lt;/g&gt;&lt;/svg&gt;&lt;span role=\"presentation\"&gt;&lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;/math&gt;&lt;/span&gt;&lt;/span&gt;&lt;script type=\"math/mml\"&gt;&lt;math&gt;&lt;/math&gt;&lt;/script&gt;&lt;/span&gt;-labeled cellulose in eight different soils was investigated experimentally and simulated using a process-based model. Our results show close agreement between the cumulative C and energy balances during the incubations, with a total C and energy release equal to 30-50% of the amount added as cellulose. Both energy and C fluxes indicated that a positive priming effect of soil organic matter (SOM) increased the release of heat and CO&lt;sub&gt;2&lt;/sub&gt; by 10 - 32% relative to the added substrate. The CR-CUE relationship indicated that growth on cellulose was energy limited during the early but not the later stages of the incubation, especially in soils with high SOM content. We partly observed systematic differences between estimates for CUE based either on the &lt;span&gt;&lt;span style=\"\"&gt;&lt;/span&gt;&lt;span data-mathml='&lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\" /&gt;' role=\"presentation\" style=\"font-size: 90%; display: inline-block; position: relative;\" tabindex=\"0\"&gt;&lt;svg aria-hidden=\"true\" focusable=\"false\" height=\"0.24ex\" role=\"img\" style=\"vertical-align: -0.12ex;\" viewbox=\"0 -51.7 0 103.4\" width=\"0\" xmlns:xlink=\"http://www.w3.org/1999/xlink\"&gt;&lt;g fill=\"currentColor\" stroke=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"&gt;&lt;/g&gt;&lt;/svg&gt;&lt;span role=\"presentation\"&gt;&lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;/math&gt;&lt;/span&gt;&lt;/span&gt;&lt;script type=\"math/mml\"&gt;&lt;math&gt;&lt;/math&gt;&lt;/script&gt;&lt;/span&gt; label or on the calorespirometric ratio. Both approaches were constrained by technical and methodological limitations and agreed best during the phase of microbial growth in the SOM-rich soils, with CUE values between 0.4-0.75 indicating efficient aerobic growth. During early stages or after transition to a maintenance phase, both estimates were less meaningful for cellulose degradation, a substrate with a lower turnover rate than glucose. Still, the coupled heat and mass balances during cellulo","PeriodicalId":21888,"journal":{"name":"Soil Biology & Biochemistry","volume":"6 1","pages":""},"PeriodicalIF":9.7,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142804871","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":"Nitrogen input alleviates the priming effects of biochar addition on soil organic carbon decomposition","authors":"Xuhui Zhou, Zhiqiang Feng, Yixian Yao, Ruiqiang Liu, Junjiong Shao, Shuxian Jia, Yining Gao, Kui Xue, Hongyang Chen, Yuling Fu, Yanghui He","doi":"10.1016/j.soilbio.2024.109689","DOIUrl":"https://doi.org/10.1016/j.soilbio.2024.109689","url":null,"abstract":"The combination of biochar and nitrogen (N) addition has been proposed as a potential strategy to sustain crop productivity and mitigate climate change by increasing soil fertility, sequestering carbon (C), and reducing soil greenhouse gas emissions. However, our current knowledge about how biochar and N additions interactively alter mineralization of native soil organic C (SOC), which is referred to priming effects (PEs), is largely limited. To address this uncertainty, C₃ biochar (pyrolyzing rice straw at 300, 550, and 800 °C) and its combination with N fertilizer (urea) were incubated in a C₄-derived soils at 25 °C. All these 3 types of biochar with different addition rates caused positive priming of native soil organic matter decomposition (up to +58.4%). The maximum negative priming effects (up to −25.4%) occurred in soil treated with 1% of N-bound biochar pyrolyzed at 300 °C. In addition, a negative correlation was found between the priming intensity and soil inorganic N content across all treatments. The decrease in biochar-induced PEs was related with a shift in microbial community composition and reduction in microbial biomass determined by chloroform-fumigation. Such a reduction, however, was not confirmed by PLFA analysis. These findings advance our understanding on the microbial mechanisms mediating net soil C balance with the adequate biochar use for blending traditional mineral fertilizers.","PeriodicalId":21888,"journal":{"name":"Soil Biology & Biochemistry","volume":"48 1","pages":""},"PeriodicalIF":9.7,"publicationDate":"2024-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142793593","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}