Pedosphere最新文献

{"title":"Unveiling root exudates: Composition, characterization, dynamics and collection strategies","authors":"Sonia MALIK ,&nbsp;Morteza YOUSEFZADI ,&nbsp;Oksana SYTAR ,&nbsp;Rambod ABIRI ,&nbsp;Pooja SHARMA ,&nbsp;Narges ATABAKI ,&nbsp;Aakanchha JAIN ,&nbsp;Siddheshwar CHAUTHE ,&nbsp;Mansour GHORBANPOUR","doi":"10.1016/j.pedsph.2025.09.017","DOIUrl":"10.1016/j.pedsph.2025.09.017","url":null,"abstract":"<div><div>Root exudates (REs) represent a promising yet under-explored source of bioactive compounds that could serve as valuable agents in various sectors, including food, medicine, and agriculture. These bioactive compounds, also known as specialized metabolites, vary in nature depending on plant species, environmental factors, and other conditions. They possess diverse biological characteristics and play a vital role in how plants respond to stress. This rapidly evolving area of research has explored a range of applications. However, significant challenges persist regarding practical implementation. These challenges include the collection, identification, and development of appropriate culture systems for REs. Understanding the mechanisms that govern the synthesis and release of REs is essential for utilizing them in a sustainable and environmentally friendly manner. This review examines the current state of knowledge on the composition of REs, their production mechanisms, separation methods, and hydroponic-based collection systems. Ultimately, the choice of methodology and system design is highly dependent on specific research objectives. Future research should focus on developing advanced, non-invasive techniques for monitoring REs, investigating the molecular mechanisms that regulate their production and scaling up controlled environments or soilless culture systems for industrial applications. To fully harness the potential of REs, an interdisciplinary approach that integrates plant physiology, analytical chemistry, microbiology, and genetics is crucial.</div></div>","PeriodicalId":49709,"journal":{"name":"Pedosphere","volume":"36 2","pages":"Pages 442-459"},"PeriodicalIF":7.3,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147652879","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Biochar and phosphogypsum in agricultural soils: Individual roles, combined potentials, and future prospects","authors":"Yiwen WANG ,&nbsp;Man QI ,&nbsp;Changfu YANG ,&nbsp;Ruyu SUN ,&nbsp;Hanbing LI ,&nbsp;Yawen ZHAO ,&nbsp;Li WANG","doi":"10.1016/j.pedsph.2025.09.009","DOIUrl":"10.1016/j.pedsph.2025.09.009","url":null,"abstract":"<div><div>Soil degradation has become a pressing global issue, posing a significant threat to the soil environment, agricultural productivity, and food security. Factors such as nutrient depletion, erosion, and contamination have contributed to the declining health of soils worldwide. Biochar (BC) and phosphogypsum (PG) have shown great promise in improving soil fertility and quality, but their combined application and the full extent of their potential benefits and limitations remain underexplored and demand comprehensive attention. This review thoroughly assesses the individual applications of BC and PG as soil amendments, focusing on their respective physicochemical properties and their effects on soil structure, fertility, and plant growth. It also explores the synergistic effects of BC and PG when used in combination, emphasizing their potential to improve soil water retention, nutrient availability, and overall plant performance, thereby offering a promising solution for sustainable agriculture. Finally, the key considerations associated with the combined use of BC and PG, such as application rate, impact on soil health, and variability in soil types are addressed, while outlining future research directions to enhance their efficacy. In conclusion, the combined application of BC and PG contributes to impoved soil health and enhanced crop yields and promotes the integrated management of biomass waste and industrial byproducts such as PG, transforming agricultural and industrial waste streams into valuable resources, thus presenting a low-cost, environmentally sustainable approach to addressing soil degradation.</div></div>","PeriodicalId":49709,"journal":{"name":"Pedosphere","volume":"36 2","pages":"Pages 416-429"},"PeriodicalIF":7.3,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147652870","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Unearthing potential of aluminum-modified biochar for saline-alkali soil rejuvenation and microbial diversity enhancement","authors":"Saba BABAR ,&nbsp;Amanullah BALOCH ,&nbsp;Muhammad QASIM ,&nbsp;Jiyuan WANG ,&nbsp;Xiangling WANG ,&nbsp;Rashid IQBAL ,&nbsp;Ali M. ABD-ELKADER ,&nbsp;Khurram SHEHZAD ,&nbsp;Xiaoyang XIA ,&nbsp;Cuncang JIANG","doi":"10.1016/j.pedsph.2025.01.003","DOIUrl":"10.1016/j.pedsph.2025.01.003","url":null,"abstract":"<div><div>Saline-alkali soils pose a serious challenge to the agricultural production system. Although ordinary biochar application has been found to be beneficial in mitigating salt stress, its effectiveness could be further enhanced through some modifications. In this study, a soil column leaching experiment was conducted to evaluate the potential roles of original rice straw biochar (OB) and aluminum-modified rice straw biochar (AB) in the reclamation of a saline-alkali soil. Five treatments were designed: treatments amended with 1% and 3% (weight:weight) OB and AB (1% OB, 3% OB, 1% AB, and 3% AB, respectively) and without biochar (control, CK), and each treatment was repeated four times under a completely randomized design. The results reflected that the 3% AB treatment was more effective than other treatments in reducing soil pH, electrical conductivity, sodium adsorption ratio, and exchangeable sodium ions (by 7.8%, 27.4%, 36.8%, and 30.2%, respectively, relative to CK). It was mainly due to the maximum replacement of sodium ions with aluminum ions on soil exchange sites. Additionally, irrigation practices further accelerated the salt removal from the soil column <em>via</em> leaching. With a reduction in salt content, soil β-1,4-glucosidase and β-cellobiohydrolase activities became enhanced, particularly in the 3% AB treatment. Notably, biochar application also altered soil microbial community composition. The relative abundance of salt-tolerant bacteria, such as Proteobacteria and Actinobacteriota, was greatly improved in the 3% AB-amended soil, thereby benefiting soil health. In conclusion, this study proves the multiple enhanced impacts of AB on overall soil properties and also provides new insight into the utilization of natural resources with slight modification for reclaiming saline-alkali soils.</div></div>","PeriodicalId":49709,"journal":{"name":"Pedosphere","volume":"36 2","pages":"Pages 511-526"},"PeriodicalIF":7.3,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147652877","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"In situ remediation of persistent organic pollutants in soil using retrievable sorbents composed of cotton fabrics decorated with UiO-66-NH3+ metal-organic frameworks","authors":"Vasiliki GOUMA ,&nbsp;Anastasia D. POURNARA ,&nbsp;Manolis J. MANOS ,&nbsp;Dimosthenis L. GIOKAS","doi":"10.1016/j.pedsph.2024.12.005","DOIUrl":"10.1016/j.pedsph.2024.12.005","url":null,"abstract":"<div><div>Sorbent amendment is a convenient method for the <em>in situ</em> remediation of soil, but it is limited by the difficulty in recovering the sorbent from soil. This work aimed to introduce a novel method for the remediation of contaminated soils that relies on the <em>in situ</em> removal of contaminants from soil by retrievable sorbents. The remediation process is based on adding cotton fabric sheets decorated with a metal-organic framework (MOF) in a contaminated soil matrix and mixing to sorb the contaminants. Then, the MOF-modified cotton fabric, carrying the sorbed pollutants, is easily retrieved from the soil. As a demonstration, a zirconium (Zr)-based MOF (UiO-66-NH₃⁺, MOR-1) was irreversibly immobilized on polydopamine (PDA)-decorated cotton fabrics (MOR-1@PDA-cotton fabric) and used to remediate a soil contaminated with organic ultraviolet (UV) filters, as model hydrophobic persistent organic pollutants, namely, 2-hydroxy-4-methoxybenzophenone, 2-ethylhexyl 4-methoxycinnamate, isoamyl 4-methoxycinnamate, 2-ethylhexyl 4-(dimethylamino)benzoate, 3-(4-methylbenzylidene)camphor, and 2-ethylhexyl 2-cyano-3,3-diphenylacrylate. The results showed that 1.88 cm² MOR-1@PDA-cotton fabric g⁻¹ soil can remove 43%–90% of the UV filters within 60 d of application in moist (&gt; 50% moisture) soil. Notably, by eluting the adsorbed UV filters from the MOR-1@PDA-cotton fabric with methanol, the sorbent could be reused up to 5 times. Not least, the sorbent exhibited good stability in aqueous and acidic media, which is an essential feature for its safe disposal. Overall, the developed method proposes a new approach to <em>in situ</em> soil remediation, paving the way for future applications exploring nanosorbent materials incorporated into bulk supports.</div></div>","PeriodicalId":49709,"journal":{"name":"Pedosphere","volume":"36 2","pages":"Pages 614-622"},"PeriodicalIF":7.3,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147652704","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Triple impact of biochar, no-tillage and cover crop: Enhancing soil carbon and climate resilience in soybean farming","authors":"Qiliang HUANG ,&nbsp;Ratih Kemala DEWI ,&nbsp;Yingting GONG ,&nbsp;Rahmatullah HASHIMI ,&nbsp;Peiran LI ,&nbsp;Masakazu KOMATSUZAKI","doi":"10.1016/j.pedsph.2024.10.002","DOIUrl":"10.1016/j.pedsph.2024.10.002","url":null,"abstract":"<div><div>With the dissemination of conservation agriculture, no-tillage (NT) and cover crops have been widely adopted globally. However, their effects on greenhouse gas (GHG) emissions are controversial. Biochar is posited to mitigate climate change by increasing carbon (C) sequestration and decreasing GHG emissions in soil. To investigate the comprehensive effect of NT, cover crop, and biochar on soil organic C (SOC) sequestration and net global warming potential (GWP), a split-split-plot experiment was conducted in the experimental field at the Center for International Field Agriculture Research and Education, Ibaraki University, Japan. The experiment involved various combinations of two tillage methods, NT and moldboard plowing (MP), two cover crop treatments, fallow (FA) and rye (RY), and two biochar treatments, biochar application (WB) and no biochar application (NB). The NT and RY treatments demonstrated a trend of increasing N₂O emission, while WB tended to reduce the N₂O emission in NT plots. Compared with the MP-FA-NB treatment, the NT-RY-WB treatment increased SOC stock (0–30 cm) by 23.2% in 2020 and 30.2% in 2021, indicating that this combination promoted C sequestration. Due to the heightened SOC stock, the net carbon dioxide (CO₂) retention effectively compensated for the GWP arising from non-CO₂ emissions. Consequently, the combination of NT, RY, and WB positively contributed to a decreased net GWP in the soybean field (-1 231 and -2 767 kg CO₂ equivalent ha⁻¹ year⁻¹ in 2020 and 2021, respectively). These findings highlight the considerable potential of the combination of NT, RY, and WB for SOC sequestration and net GWP decrease, positioning it as an environmentally beneficial agricultural system for mitigating climate change during long-term food production in Asia.</div></div>","PeriodicalId":49709,"journal":{"name":"Pedosphere","volume":"36 2","pages":"Pages 623-637"},"PeriodicalIF":7.3,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147652822","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mineral-associated organic carbon promotes phosphorus accumulation in a long-term fertilized black soil","authors":"Naiyu ZHANG ,&nbsp;Xiuzhi ZHANG ,&nbsp;Yanhua CHEN ,&nbsp;Lehlogonolo Abner MATELELE ,&nbsp;Ping ZHU ,&nbsp;Hongfang LIU ,&nbsp;Xianmei ZHANG ,&nbsp;Hongjun GAO ,&nbsp;Gu FENG ,&nbsp;Chang PENG ,&nbsp;Shuxiang ZHANG","doi":"10.1016/j.pedsph.2024.10.003","DOIUrl":"10.1016/j.pedsph.2024.10.003","url":null,"abstract":"<div><div>Soil phosphorus (P) pools are intimately connected to organic carbon (OC), especially mineral-associated OC (MAOC). However, the relationships between MAOC fractions and P fractions and their responses to fertilization remain unclear. In a long-term field experiment established on a black soil (Mollisol) in Gongzhuling, Jilin Province, Northeast China, in 1989, topsoils with no fertilizer (control, CK), conventional application of chemical fertilizer (CF), and chemical fertilizer combined with straw addition (CFS) were sampled in 2010 (21 years) and 2018 (29 years), and organo-mineral complexes (&lt; 20 μm) were separated and analyzed. Compared to CK, the CF treatment resulted in soil acidification, increasing the content of the MAOC fraction bound to minerals by weak linkages in complexes. The CFS treatment maintained soil pH at 7.84 in 2010 and 7.53 in 2018, with significantly higher contents of four MAOC fractions, remaining water-soluble OC, OC bound by cations, OC encapsulated by resistant carbonate, and insoluble OC (humin), than those in the CF treatment. Fertilization application increased total P content in the organo-mineral complexes, with similar total P content between the CF and CFS treatments. Chemical fertilizer mainly increased highly labile inorganic P (P_i) extracted by resin strips + deionized water, NaHCO₃, and NaOH, as well as organic P (P_o) extracted by NaHCO₃, and straw addition mainly increased moderately labile P_i extracted by dilute HCl. Correlation analysis showed that the dominant MAOC fractions had positive relationships with the increased P fractions. X-ray absorption near-edge structure spectroscopy further identified that the CF treatment increased the proportion of AlPO₄, suggesting that MAOC promoted the retention of labile P <em>via</em> association with aluminum (Al) under weakly acidic conditions. The CFS treatment increased the proportion of Ca₃(PO₄)₂ and Ca₅(PO₄)₃OH; moreover, it also increased the maximum P sorption capacity of the organo-mineral complexes, suggesting that MAOC enhanced P sorption <em>via</em> association with calcium (Ca) under weakly alkaline conditions and that adsorbed P would transform into more stable Ca-associated P. Our findings demonstrated that MAOC promoted P accumulation <em>via</em> association with different P fractions, and these processes were mineral- and pH-dependent.</div></div>","PeriodicalId":49709,"journal":{"name":"Pedosphere","volume":"36 2","pages":"Pages 484-496"},"PeriodicalIF":7.3,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147652875","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Amelioration of coastal saline soils of Chinese river deltas via soil amendments: A meta-analysis","authors":"Jianyu TAO ,&nbsp;Xiaoyuan LIU ,&nbsp;Sandra SPIELVOGEL","doi":"10.1016/j.pedsph.2025.09.014","DOIUrl":"10.1016/j.pedsph.2025.09.014","url":null,"abstract":"<div><div>The amelioration of coastal saline soils has the potential to deliver large areas of farmlands to meet the increasing global food demand. Although numerous studies have been conducted in recent years, a systematic evaluation of the efficacy of various amendments for saline soil amelioration remains absent. Hence, a meta-analysis was performed to compare the effects of various amendments on soil physicochemical properties and crop yield, based on data extracted from 97 peer-reviewed publications. <em>Our results indicate</em> that the application of organic amendments (<em>i.e</em>., biochar, compost, crop residues, and organic wastes) reduces soil salinity and bulk density, while simultaneously increasing the soil macroaggregate ratio and crop yield. Due to the purposive selection of raw materials, organic amendments generally exhibit positive effects on replenishing soil carbon, nitrogen, and phosphorus pools, which alleviates nutrient deficiencies in coastal saline soils. However, gypsum is unsuitable for ameliorating coastal saline soils, since there are no significant improvements observed in soil salinity and nutrient contents. <em>Our meta-regression results</em> indicate that the effects of amendments are either positively correlated or show no relationship with application amounts. Overall, <em>this meta-analysis reveals</em> that the application of organic amendments is an effective way for ameliorating coastal salt-affected soils. However, optimal application rates should be assessed to mitigate potential environmental risks in future studies.</div></div>","PeriodicalId":49709,"journal":{"name":"Pedosphere","volume":"36 2","pages":"Pages 387-401"},"PeriodicalIF":7.3,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147652955","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Decomposition characteristics of woody peat and its mixtures with liable organic materials in a newly reclaimed saline-alkali soil: A one-year incubation experiment","authors":"Yanyun ZHENG ,&nbsp;Zhenghong YU ,&nbsp;Jiabao ZHANG ,&nbsp;Congzhi ZHANG ,&nbsp;Donghao MA ,&nbsp;Lin CHEN ,&nbsp;Guixiang ZHOU","doi":"10.1016/j.pedsph.2024.11.001","DOIUrl":"10.1016/j.pedsph.2024.11.001","url":null,"abstract":"<div><div>The combined application of woody peat with labile organic materials is an effective strategy for rapidly improving soil organic matter (SOM) and soil fertility in newly reclaimed lands. However, their decomposition dynamics, which can be greatly influenced by the residue-mixing effect, are not well understood. Therefore, this study investigated the decomposition characteristics and residue-mixing effect of woody peat, corn straw, organic manure, and their binary mixtures in a newly reclaimed saline-sodic soil through a 360-d incubation experiment. The results revealed that both straw and organic manure contained large amounts of O-alkyl carbon (C), leading to rapid decreases in their weight and organic C (OC) content during incubation. In contrast, the woody peat was rich in alkyl C and aromatic C, exhibiting the highest alkyl C/O-alkyl C (A/O-A) ratio and aromaticity. As a result, the woody peat only lost less than 6.4% OC and showed minimal changes in weight and total nitrogen content after one-year incubation, indicating strong degradation resistance in the saline-sodic soil. The combination of woody peat with corn straw or organic manure induced significant non-additive synergistic effects on their weight and OC losses, aromatic C, carbonyl C, A/O-A ratio, and aromaticity. This suggests that the addition of woody peat significantly slowed down the degradation of the mixtures and prolonged the retention of OC in soil. On the contrary, the mixing of corn straw and organic manure led to significant non-additive antagonistic effects on their weight and OC losses, indicating that their combination accelerated their decomposition. Consequently, this study suggests that, in contrast to the single application of various labile organic materials, the combined application of recalcitrant woody peat with labile organic materials can extend the presence of organic matter in soil, thereby promoting a sustained increase in both active and passive SOM contents and soil fertility.</div></div>","PeriodicalId":49709,"journal":{"name":"Pedosphere","volume":"36 2","pages":"Pages 580-594"},"PeriodicalIF":7.3,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147652819","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impact of organic carbon composition on bacterial community assembly in organic and mineral soil layers under phosphorus addition in a Robinia pseudoacacia plantation","authors":"Ahejiang SAILIKE ,&nbsp;Yujie LIANG ,&nbsp;Rong FU ,&nbsp;Hongjian HAO ,&nbsp;Rong WANG ,&nbsp;Ning PENG ,&nbsp;Shicai LI ,&nbsp;Zhouchang YU ,&nbsp;Fangxin ZHENG ,&nbsp;Wei ZHANG ,&nbsp;Yangyang LIU ,&nbsp;Peizhi YANG ,&nbsp;Zhixin ZHANG","doi":"10.1016/j.pedsph.2024.11.004","DOIUrl":"10.1016/j.pedsph.2024.11.004","url":null,"abstract":"<div><div>Increasing phosphorus (P) inputs significantly affect the nutrient cycle of terrestrial ecosystems. The community structure and assembly processes of soil bacteria, which are the primary participants in nutrient cycling within terrestrial ecosystems, are affected by P inputs. However, the assembly processes and driving mechanisms of soil bacterial communities in artificial forest ecosystems in response to P inputs remain unclear. Therefore, in this study, an experiment was conducted in an artificial <em>Robinia pseudoacacia</em> forest on the Loess Plateau to investigate the effects of P additions (0, 0.5, 1, 2, and 4 g P m⁻² year⁻¹) on soil organic carbon (SOC) composition, bacterial community characteristics (total, abundant, and rare taxa), and assembly processes in the organic horizon (OH) and mineral horizon (MH). The results showed that P addition significantly changed soil physicochemical properties, such as available P (AP), SOC content, and SOC composition in terms of labile and recalcitrant SOC fractions. The proportion of labile SOC fraction increased in OH and decreased in MH, whereas the recalcitrant SOC fraction showed the opposite trend. In OH, the proportion of eutrophic bacteria increased, whereas the proportion of oligotrophic bacteria decreased. In contrast to those in OH, the changes in eutrophic and oligotrophic bacteria in MH exhibited the opposite trend. The diversity of bacterial communities in OH did not change significantly with increasing P levels. In MH, the diversity of total and rare taxa increased, while the diversity of abundant taxa decreased. Under P addition, the total and rare bacterial taxa showed stochastic assembly, whereas the assembly of abundant taxa shifted from stochastic to deterministic processes in OH and from deterministic to stochastic processes in MH. The partial-least squares path modeling revealed that under P addition, the assembly of total and rare bacterial communities in OH and MH was regulated by AP and labile SOC fraction, respectively. Meanwhile, the assembly of abundant taxa in OH and MH was influenced by labile and recalcitrant SOC fractions, respectively. Our findings highlight the critical role of SOC composition across different bacterial taxa, with abundant taxa exhibiting heightened sensitivity to environmental filtration and the availability of SOC resources. Our study provides new insights into the community assembly and driving mechanisms of soil bacteria in artificial forest soils under P addition.</div></div>","PeriodicalId":49709,"journal":{"name":"Pedosphere","volume":"36 2","pages":"Pages 554-567"},"PeriodicalIF":7.3,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147652820","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Artificial humic acid promotes carbon sequestration in the rice-soil system","authors":"Zeyu ZHANG ,&nbsp;Yu QIAO ,&nbsp;Dongxing XIE ,&nbsp;Jicheng HAN ,&nbsp;Zhuqing LIU ,&nbsp;Ying ZHAO ,&nbsp;Fan YANG","doi":"10.1016/j.pedsph.2024.11.002","DOIUrl":"10.1016/j.pedsph.2024.11.002","url":null,"abstract":"<div><div>Artificial humic acid (AHA) is a new exogenous organic material with enormous carbon (C) sequestration potential. However, the effects of applying AHA under different irrigation regimes on C sequestration in the rice-soil system and the underlying mechanisms still need to be clarified. This study employed C isotope labeling technology to analyze the photosynthetic C sequestration capacity, C transport capacity of rice roots, and greenhouse gas emission flux in the rice-soil system under different irrigation regimes and AHA application conditions. The results showed that as the amount of AHA application increased, the leaf area and chlorophyll concentration gradually increased, and the ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) activity first increased and then decreased under two irrigation regimes (conventional flooding and alternate wetting and drying irrigation). In the alternate wetting and drying irrigation with 300 mg kg⁻¹ AHA application treatment (DWI3), the photosynthetic C fixation was the highest, with the net photosynthetic rate increasing by 65.35% compared to the alternate wetting and drying irrigation without applying AHA treatment (DWI0). Meanwhile, the organic acid concentration in root exudates, biomass, length, surface area, and length density were also the highest in the DWI3 treatment. Besides, the content of ¹³C in soil was the highest in the DWI3 treatment, closely related to the strongest photosynthetic C fixation and root transport capacity, as well as the lowest greenhouse gas emission flux. Therefore, it is recommended to apply 300 mg kg⁻¹AHA with alternate wetting and drying irrigation for C sequestration, water conservation, and sustainable agricultural development.</div></div>","PeriodicalId":49709,"journal":{"name":"Pedosphere","volume":"36 2","pages":"Pages 497-510"},"PeriodicalIF":7.3,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147652876","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}