Geoderma最新文献

{"title":"Plateau zokor disturbances transform the stability and functional characteristics of soil fungal communities","authors":"Xiaojuan Zhang ,&nbsp;Zhuangsheng Tang ,&nbsp;Jie Yang ,&nbsp;Saman Herath ,&nbsp;Zhiwen Wang ,&nbsp;Yiming Wang ,&nbsp;Guangjun Chen ,&nbsp;Lei Yue","doi":"10.1016/j.geoderma.2025.117232","DOIUrl":"10.1016/j.geoderma.2025.117232","url":null,"abstract":"<div><div>As crucial regulators of the ecosystem functions, soil microbes are facing a range of challenges including ecological degradation caused by small mammal disturbances. These disturbances not only threaten biodiversity but also affect the healthy functioning of ecosystems. Effects of plateau zokor (<em>Eospalax baileyi</em>) disturbances on the complexity, stability and assembly processes of belowground microbial networks remain unclear. In this study, we employed ITS rRNA gene amplicon sequencing to systematically investigate fungal network properties, assembly mechanisms, functional potential, and the links to plant-soil functions in soil fungal communities through various stages of zokor mound succession: (i) new mounds (NM), (ii) semi-new mounds (SM), (iii) old mounds (OM) and (iv) pristine grassland (CK), as a control. The results demonstrated that zokor disturbances significantly altered plant species diversity and soil properties, simultaneously affecting the composition and structure of soil fungal communities. Disturbances increased the complexity of fungal community networks but decreased their stability. Moreover, dispersal limitation and homogeneous selection were identified as the primary mechanisms that shape fungal community structure. Functional potential analysis revealed that zokor disturbances led to a decline in the relative abundance of lichenized fungi and plant saprotrophs. Multiple environmental factors, including soil pH, soil organic carbon (SOC), and total phosphorus (TP) were identified as pivotal in driving changes in soil fungal communities. These results deepen our comprehension of the impacts of small mammal disturbances on fungal community characteristics in the Tibetan Plateau grassland ecosystem and provide valuable insights into the potential mechanisms sustaining fungal diversity in extreme environments.</div></div>","PeriodicalId":12511,"journal":{"name":"Geoderma","volume":"455 ","pages":"Article 117232"},"PeriodicalIF":5.6,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143508462","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 role of pyrogenic carbon addition after wildfires in the boreal forest of China: Impact on plant–soil–microbial ecological stoichiometry","authors":"Xu Dou ,&nbsp;Jianyu Wang ,&nbsp;Kajar Köster ,&nbsp;Cheng Yu ,&nbsp;Yuexiao Ren ,&nbsp;Long Sun ,&nbsp;Tongxin Hu","doi":"10.1016/j.geoderma.2025.117237","DOIUrl":"10.1016/j.geoderma.2025.117237","url":null,"abstract":"<div><div>Pyrogenic carbon (PyC) is a common byproduct of wildfires in terrestrial systems; however, its role in fire-prone forest ecosystems, particularly cold boreal forests, remains unclear. Ecological stoichiometry is a valuable tool for studying interactions within plant–soil–microbial continuum systems, which could help us understand post-fire changes in boreal forest ecosystems. In this study, we manipulated different additions of PyC in a forest of Dahurian larch (<em>Larix gmelinii</em>) after a wildfire to investigate the effects of PyC on plant–soil–microbial ecological stoichiometry. We engineered PyC under controlled conditions to simulate that produced by wildfires. The experimental design included no PyC addition (C0), 0.5 kg m⁻² PyC addition (C1), 1.0 kg m⁻² PyC addition (C2), and no fire as a control (CK). One year after PyC manipulation, understory vegetation and soil samples (0–10 cm depth) were collected to investigate how PyC addition affects plant–soil–microbial carbon (C), nitrogen (N), and phosphorus (P) stoichiometry. Our results showed that PyC addition (C1, and C2) increased plant biomass, particularly in the green tissues (35–53 % higher than that in the CK and 59–80 % higher than that in the C0 treatment). The C2 treatment also increased the plant C and N contents but did not significantly affect plant P content. PyC addition led to an increase in soil microbial biomass N (MBN) and P (MBP), altered the microbial biomass C:N:P ratio (to 27:1:1), and disrupted the microbial dynamic balance, indicating a possible shift towards a bacterial-dominated community. In boreal forest soils, post-fire PyC manipulation elevated soil organic C (SOC) and total P (STP). As there were no changes in soil total N (STN), the addition of PyC also increased the soil C:N and C:P ratios. Our findings highlight the potential of PyC as a soil conditioner that enhances plant biomass and alters nutrient cycling in boreal forests. However, PyC effects are modulated by soil resource availability and the nutrient environment. Further studies are required to elucidate the mechanisms underlying these differential nutrient responses.</div></div>","PeriodicalId":12511,"journal":{"name":"Geoderma","volume":"455 ","pages":"Article 117237"},"PeriodicalIF":5.6,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143526584","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":"Soil quality improvement on Qinghai-Tibet Plateau induced by soil hydrothermal changes from 1980s to 2020s","authors":"Kuan Chen ,&nbsp;Jingyao Suo ,&nbsp;Xiaodong Song ,&nbsp;Yiyao Liu ,&nbsp;Xiang Xiang ,&nbsp;Yingping Pan ,&nbsp;Jiarui Wang ,&nbsp;Liang Ren ,&nbsp;Xiaodong Ge ,&nbsp;Xia Xu ,&nbsp;Xiuchen Wu ,&nbsp;Lei Duan ,&nbsp;Yongmei Huang","doi":"10.1016/j.geoderma.2025.117235","DOIUrl":"10.1016/j.geoderma.2025.117235","url":null,"abstract":"<div><div>The Qinghai-Tibet Plateau (QTP), as the world’s Third Pole, has experienced a sharp trend of warming and humidifying in recent decades within the context of global climate change. Under these circumstances, the soil nutrient cycling has been significantly modified. However, whether the soil quality had changed over recent decades on QTP remains unclear. In this study, we calculated, and drew high-resolution maps of the soil quality index (SQI) on QTP using soil property data in 1980s and 2020s. Results showed significantly an increasing trend of soil quality over the past four decades. The variation in trends of four typical ecosystems, more specifically, alpine cushion vegetation showing the most notable increase, followed by alpine meadow and alpine steppe, while forest &amp; shrub exhibiting the smallest increase in soil quality. This implied that regions with more significant SQI changes correspond to stronger climate change. Through attribution analysis of 10 factors affecting the variation in SQI, including climate, soil hydrothermal, vegetation, and human activities, we found that the improvement in soil quality were predominantly driven by soil hydrothermal conditions. Additionally, we observed a pronounced increase in nitrogen limitation, with the factors contributing to this trend varying across different ecosystems. Our study emphasizes the warning of intensified nitrogen limitation, and, under the context of climate change, this phenomenon is likely to become increasingly severe in the future.</div></div>","PeriodicalId":12511,"journal":{"name":"Geoderma","volume":"455 ","pages":"Article 117235"},"PeriodicalIF":5.6,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143528735","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":"A meta-analysis reveals earthworms as mutualists rather than predators of soil microorganisms","authors":"Manuel Blouin ,&nbsp;Aïssa Robin ,&nbsp;Lysandre Amans ,&nbsp;Frédérique Reverchon ,&nbsp;Isabelle Barois ,&nbsp;Patrick Lavelle","doi":"10.1016/j.geoderma.2025.117238","DOIUrl":"10.1016/j.geoderma.2025.117238","url":null,"abstract":"<div><div>Microorganisms constitute the largest biomass on Earth after plants, and earthworms are one of the main components of animal biomass. Both are critical drivers of soil functions and ecosystem services. Studies report either positive or negative effects of earthworms on soil microbial communities, leading to contrasting views on whether microorganisms serve as prey or mutualists for earthworms. This <em>meta</em>-analysis aimed to settle this debate, and examines how biotic and abiotic factors affect earthworm impacts on microbial abundance and diversity. Based on a selective search retaining only genuinely quantitative approaches, we kept 169 observations, showing that, on average, earthworms increased bacterial abundance by 16.5 % and fungal abundance by 31.4 %. Bacterial species richness rose by 8.5 % in the presence of earthworms, but fungal richness was not significantly affected. Epigeic and anecic earthworms had more notable effects than endogeics. Plant presence in experimental designs strongly amplified earthworms’ effects on bacterial (+30 %) and fungal (+97 %) abundances. The largest earthworm-induced effects were observed in carbon- and nitrogen-rich soils and at low pH, while the addition of organic matter reduced these effects. Comparing microbial abundance in earthworm casts to control units without earthworms revealed effect sizes two- to three-fold greater (for bacteria and fungi, respectively) than when using the soil surrounding earthworm casts as a control. Our <em>meta</em>-analysis demonstrates that, despite ingesting some microorganisms, earthworms have a net positive effect on their abundance, positioning them as mutualists rather than predators of bacteria and fungi.</div></div>","PeriodicalId":12511,"journal":{"name":"Geoderma","volume":"455 ","pages":"Article 117238"},"PeriodicalIF":5.6,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143526583","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":"Long-term regulation of maize crop residue carbon accumulation in soil and aggregates by epigeic and endogeic earthworms is tillage regime-specific","authors":"Xinyu Zhu ,&nbsp;Yunchuan Hu ,&nbsp;Zhen He ,&nbsp;Donghui Wu ,&nbsp;Andrey S. Zaitsev","doi":"10.1016/j.geoderma.2025.117231","DOIUrl":"10.1016/j.geoderma.2025.117231","url":null,"abstract":"<div><div>Earthworms influence soil carbon (C) sequestration by modulating the balance between plant residue C incorporation and soil C mineralization below ground. The knowledge of the prolonged effects and backstaging mechanisms of C sequestration by earthworms belonging to different ecological groups in no-tillage (NT) and conventional tillage (CT) agroecosystems is still surprisingly sketchy. Therefore, we analyzed the contribution of the epigeic species <em>Eisenia nordenskioldi</em> (Eisen) and the endogeic species <em>Metaphire tschiliensis</em> (Michaelsen) to the distribution of C in soil and soil aggregates of different sizes from the ¹³C-labeled maize residue. For this, we ran a 337-day-long mesocosm experiment with simulated NT and CT systems. At the end of the experiment, epigeic and endogeic earthworm treatments in NT soil significantly increased SOC concentration by 16.61% and 17.31%, respectively if compared with the situation on day 40. However, no significant effects were observed in CT soil. In NT soil, the presence of <em>M. tschiliensis</em> significantly increased residue-derived C in SOC, whereas this effect was not significant in CT soil. The presence of <em>M. tschiliensis</em> increased the ¹³C content in all soil aggregate size classes in both NT and CT soils at the end of the experiment. The interaction between the two earthworm species treatments significantly positively affected the ¹³C content across all soil aggregate size classes in NT soil. This means that in NT soil, earthworms can aid the accumulation of larger amounts of ¹³C via enriching soil aggregates with C derived from crop residues. Our study further demonstrated that compared to epigeic earthworms, endogeics are more likely to promote the retention of maize residue-derived C in soil. Such differential contribution of the two ecological groups of earthworms explored to the stabilization of C in aggregates highlights the need for functionally diverse soil macrofauna in agroecosystems to achieve synergies in the delivery of essential ecological services in low input agriculture.</div></div>","PeriodicalId":12511,"journal":{"name":"Geoderma","volume":"455 ","pages":"Article 117231"},"PeriodicalIF":5.6,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143547101","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 problematic case of data leakage: A case for leave-profile-out cross-validation in 3-dimensional digital soil mapping","authors":"Kingsley John ,&nbsp;Daniel D. Saurette ,&nbsp;Brandon Heung","doi":"10.1016/j.geoderma.2025.117223","DOIUrl":"10.1016/j.geoderma.2025.117223","url":null,"abstract":"<div><div>Data leakage occurs when there is an overlap between the data used for model fitting and hyperparameter tuning, and those used for testing. This overlap biases the model performance, making it uninformative regarding the model’s ability to generalize. This is a significant issue in machine learning and predictive soil mapping, compromising model reliability. To demonstrate this issue, the 3-dimensional (3D) digital soil mapping (DSM) approach, whereby depth is used as a predictor of soil properties, was investigated. We compare two common approaches from the literature: leave-sample-out cross-validation (LSOCV) versus leave-profile-out cross-validation (LPOCV). Here, we argue that LSOCV results in contamination of the test dataset due to the potential vertical autocorrelation of soil properties from different samples within the same profile, and a more appropriate approach for testing 3D DSM models should be to fully partition all soil samples from the same profile to either the training or test dataset (i.e., LPOCV). Using the Ottawa region of Ontario, Canada, as a case study, cation exchange capacity (CEC), clay content, pH, and total organic carbon (TOC) were predicted using machine learning, and the discrepancy in accuracy metrics was reported. Furthermore, we evaluated the effects of data augmentation (i.e., the creation of additional synthetic data points from the original data) on accuracy metrics, a common practice in 3D DSM. Here, it was shown that with the augmented dataset, LSOCV generated overly optimistic accuracy metrics (e.g., CCC) that were 29–62% higher than LPOCV, while for the non-augmented data, the accuracy metrics were 8–18% higher, suggesting that vertical autocorrelation had a strong influence on inflating model accuracy through data leakage. As such, we strongly urge DSM practitioners to provide greater clarity when describing how model accuracy metrics were ascertained and to consider the use of LPOCV when applied to 3D DSM. This brings about broader concerns that policymakers and stakeholders may use map products with the false impression that the maps are more accurate than they are. Future research should focus on refining DSM methods and considering data structure to prevent data leakage in modelling soil properties.</div></div>","PeriodicalId":12511,"journal":{"name":"Geoderma","volume":"455 ","pages":"Article 117223"},"PeriodicalIF":5.6,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143526591","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":"Nitrogen addition promotes the coupling of deep soil carbon and nitrogen under different vegetation restoration types in the Chinese Loess Plateau","authors":"Shihao Gong ,&nbsp;Xiaoxia Zhang ,&nbsp;Hengshuo Zhang ,&nbsp;Lianwei Gao ,&nbsp;Tonggang Zha","doi":"10.1016/j.geoderma.2025.117236","DOIUrl":"10.1016/j.geoderma.2025.117236","url":null,"abstract":"<div><div>Carbon-nitrogen coupling is important to maintain various functions in forest ecosystems and is thus, an important indicator of forest ecosystem health. However, the magnitude of this indicator’s importance to environmental changes remains virtually unknown, especially for deep soils across vegetation types. In this study, four representative sites, namely <em>Pinus tabulaeformis</em> forest, <em>Robinia pseudoacacia</em> forest, <em>Pinus tabulaeformis</em> x <em>Robinia pseudoacacia</em> mixed forest, and <em>Populus davidiana</em> x <em>Quercus wutaishanica</em> natural secondary forest, were selected as representatives of typical artificial and natural forests. A one-year N addition experiment was conducted to analyze C-N coupling conditions of different vegetation restoration types, and soil properties in the 0 – 100 cm layer, litter traits, and rainfall distribution characteristics were measured and compared during the growing season. (1) Soil C and N in artificial forests decoupled with increasing soil depth, while soil C and N were highly coupled among all soil depths in natural forest. (2) N addition had a greater effect on deep soil nutrient accumulation compared to topsoil. (3) N addition decreases the rates of change of deep soil N, which, in turn, enhanced the C and N coupling. (4) Moreover, further analyses with a structural equation model showed that summer precipitation is the key regulator of soil C:N ratio in topsoil. Soil pH, litter C:N ratio, and N deposition were primarily responsible for controlling deep soil C and N coupling. These results indicate that N addition and vegetation restoration types affect soil C and N coupling and should be taken into consideration when assessing deep soil C and N biogeochemical cycles. The importance of deep soil should be considered as much as possible during afforestation on the Loess Plateau. Afforestation should be conducted in a way of natural restoration. This study provides novel insights into the regulatory mechanisms of C and N biogeochemistry and the afforestation patterns of vegetation restoration in arid and semi-arid regions.</div></div>","PeriodicalId":12511,"journal":{"name":"Geoderma","volume":"455 ","pages":"Article 117236"},"PeriodicalIF":5.6,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143547103","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":"More persistent precipitation regimes induce soil degradation","authors":"Olga Vindušková ,&nbsp;Gaby Deckmyn ,&nbsp;Simon Reynaert ,&nbsp;Karen Vancampenhout ,&nbsp;Steffen Schlüter ,&nbsp;Jan Frouz ,&nbsp;Hans De Boeck ,&nbsp;Miguel Portillo-Estrada ,&nbsp;Erik Verbruggen ,&nbsp;Han Asard ,&nbsp;Gerrit T.S. Beemster ,&nbsp;Ivan Nijs","doi":"10.1016/j.geoderma.2025.117230","DOIUrl":"10.1016/j.geoderma.2025.117230","url":null,"abstract":"<div><div>In the mid-latitudes, precipitation regimes are becoming more persistent, with longer consistently dry and rainy periods. Such a rise in precipitation regime persistence (PRP) – defined as the length of consecutive dry or wet periods – could significantly affect soil properties and their role in soil–plant-water relationships. To investigate these effects, we conducted a 16-month outdoor grassland mesocosm experiment. We simulated four levels of PRP by varying the duration of alternating dry and rainy periods: 1, 6, 15, or 60 days. The regimes started with either a dry or a wet period, resulting in two levels of timing and eight different treatments altogether, all of which received the same total amount of water across the entire experiment.</div><div>Higher PRP (longer alternation periods) decreased soil aggregate stability, without a similar trend in total soil carbon. PRP also affected potential soil water repellency (SWR) in interaction with timing. Higher PRP decreased potential SWR when the timing of the dry periods coincided with summer heatwaves and plant productivity was overall hindered. However, when the dry periods coincided with less warm months and the overall plant productivity was maintained, PRP increased potential SWR. PRP enhanced actual soil water repellency measured in the field which reduced infiltration rates. Water retention was also affected, with lower field capacity and available water capacity in the more persistent treatments, and wilting point following a convex relationship across the PRP range. Furthermore, bulk density increased with PRP. Structural equation modeling revealed that these soil degradation patterns often but not always correspond with plant productivity, which in general declined with PRP. However, some soil properties proved to be more sensitive to PRP than plant productivity. Overall, more persistent precipitation regimes induced soil degradation especially by reducing aggregate stability, water retention, and infiltration, and this soil legacy may exacerbate the effects of future climate change on temperate grasslands.</div></div>","PeriodicalId":12511,"journal":{"name":"Geoderma","volume":"455 ","pages":"Article 117230"},"PeriodicalIF":5.6,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143547102","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":"Update and expansion of the soil and landscape grid of Australia","authors":"Brendan P. Malone ,&nbsp;Ross Searle ,&nbsp;Matthew Stenson ,&nbsp;David McJannet ,&nbsp;Peter Zund ,&nbsp;Mercedes Román Dobarco ,&nbsp;Alexandre M.J.-C. Wadoux ,&nbsp;Budiman Minasny ,&nbsp;Alex McBratney ,&nbsp;Mike Grundy","doi":"10.1016/j.geoderma.2025.117226","DOIUrl":"10.1016/j.geoderma.2025.117226","url":null,"abstract":"<div><div>The Soil and Landscape Grid of Australia (SLGA) has been significantly updated and expanded. The initial version, released in 2015, provided the first continental-scale characterization of soil resources adhering to GlobalSoilMap specifications. It featured digital maps for 11 key soil attributes (including bulk density, organic carbon, soil texture, pH, available water capacity, total nitrogen, total phosphorus, effective cation exchange capacity, and soil thickness) at a 90 m × 90 m spatial resolution and served as a widely accessed national resource with substantial global influence.</div><div>The updated version, developed between 2018 and 2023, includes enhancements to the original 11 soil attributes and introduces 13 additional products. These additions improve the representation of key soil characteristics, such as soil carbon composition, soil microbial distribution, and soil moisture fluxes, contributing to a more comprehensive understanding of Australia’s soil and landscape resources.</div><div>The updated data and methodologies offer a robust foundation for developing a national soil monitoring program and other applications. The advancements in the SLGA and its associated data systems are detailed, and all products are freely available for public use.</div></div>","PeriodicalId":12511,"journal":{"name":"Geoderma","volume":"455 ","pages":"Article 117226"},"PeriodicalIF":5.6,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143547104","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":"Soil water, salt, and microplastics interact during migration: Performance and mechanism","authors":"Xuguang Xing ,&nbsp;Haoxuan Feng ,&nbsp;Sihan Jiao ,&nbsp;Tianjiao Xia ,&nbsp;Dongwei Li ,&nbsp;Fengyue Zhao ,&nbsp;Weihua Wang","doi":"10.1016/j.geoderma.2025.117229","DOIUrl":"10.1016/j.geoderma.2025.117229","url":null,"abstract":"<div><div>Farmland salinization and microplastics (MPs) pollution are important environmental issues that threaten soil ecosystems. However, the interactions among soil water, salt, and MPs during migration in MPs-contaminated saline soils remain unexplored. To address this, we conducted an infiltration test using loam soils with four different salinity levels and polyethylene MPs concentrations. Experimental results showed that both MPs and salts inhibited water infiltration and that the inhibitory effect of MPs weakened with increasing soil salinity. After infiltration, MPs increased the water content in the shallow soil layer (0–15 cm) and decreased that in the deep layer (15–30 cm). Furthermore, total salt content of MPs-containing soils was higher than that of MP-free soils in the deep layer. Notably, MPs hindered the leaching of Na⁺ and SO₄^2-, and a larger obstruction was observed for Na⁺ compared to SO₄^2- leaching. In addition, MPs migrated more easily in non-saline soils, and higher salinity had a stronger inhibitory effect on MPs migration than lower salinity. Mechanism analysis indicated that MPs influence water movement through their water-repellent properties, changing the soil pore size distribution, and degradation of soil structure. Moreover, salts affect water movement by reducing the mobility of soil water and blocking soil macropores. Additionally, the surface of MPs is negatively charged and can adsorb Na⁺ in soil through electrostatic forces, further influencing salt migration. Furthermore, the presence of salt ions affects the migration ability of MPs by reducing their electrostatic repulsion and increasing the mean hydrodynamic diameter of MPs particles. These findings provide valuable insights for developing healthy soil–crop systems for croplands rich in MPs and salts.</div></div>","PeriodicalId":12511,"journal":{"name":"Geoderma","volume":"455 ","pages":"Article 117229"},"PeriodicalIF":5.6,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143480682","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}