Soil & Tillage Research最新文献

{"title":"Moderate pasture intensification enhances soil organic carbon stocks in a degraded Brazilian Ferralsol","authors":"Lucas Raimundo Bento ,&nbsp;João Vitor dos Santos ,&nbsp;Steffen A. Schweizer ,&nbsp;Carla Pereira de Morais ,&nbsp;Milene Corso Mitsuyuki ,&nbsp;Patrícia Perondi Anchão Oliveira ,&nbsp;José Ricardo Macedo Pezzopane ,&nbsp;Alberto Carlos de Campos Bernardi ,&nbsp;Ladislau Martin-Neto","doi":"10.1016/j.still.2025.106534","DOIUrl":"10.1016/j.still.2025.106534","url":null,"abstract":"<div><div>Sustainable intensification presents a unique opportunity to enhance carbon stocks in degraded pastures by optimizing forage production and consumption, thereby increasing soil organic matter (SOM) inputs. This study aimed to (i) compare soil carbon stocks to a depth of 1 m across various intensively managed pastures subjected to nitrogen fertilization, adjustments in animal stocking rates, and rotational grazing on a previously degraded pasture (DP) in a long-term field experiment in Brazilian Ferralsols; and (ii) evaluate changes in SOM composition. We compared irrigated pastures with a high animal stocking rate (IHS), a rainfed pasture with a high animal stocking rate (RHS), and a rainfed pasture with a moderate animal stocking rate (RMS) to improve DP. The origin of SOM was assessed using the natural abundance of ¹³C and its composition through the H/C atomic ratio and the aromaticity index (H_LIFS) obtained by laser-induced fluorescence spectroscopy. A comparison between the degraded pasture and the adjacent native vegetation showed that unmanaged pasture reduced carbon stocks by 45 Mg C ha⁻¹. However, intensification in degraded pasture enhanced the organic carbon stocks from 102 to 139 Mg C ha⁻¹ for RHS and 162 Mg C ha⁻¹ for RMS in the top 1 m. These values were comparable to those of the adjacent native forest (148 Mg C ha⁻¹). In contrast, high intensification in IHS with irrigation and high nitrogen fertilization did not increase organic carbon stocks compared to unmanaged DP, which remained at 111 Mg C ha⁻¹. Both RHS and RMS promoted the accumulation of aliphatic compounds, as evidenced by the high H/C atomic ratio and low H_LIFS index. When comparing RHS and RMS, we observed that a moderate animal stocking rate resulted in a greater accumulation of pasture-derived carbon (52 Mg C ha⁻¹) than a high animal stocking rate (37 Mg C ha⁻¹) in the top 30 cm. This difference is likely due to faster pasture regrowth under moderate stocking rates, leading to increased incorporation of pasture-derived SOM. Overall, moderate pasture intensification promoted carbon sequestration (2 Mg C ha⁻¹ year⁻¹) compared to DP by introducing carbon derived from forage, reducing nitrogen fertilizer use, and preserving carbon from native vegetation.</div></div>","PeriodicalId":49503,"journal":{"name":"Soil & Tillage Research","volume":"251 ","pages":"Article 106534"},"PeriodicalIF":6.1,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143591904","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":"Clay-to-carbon ratio: An overlooked but pivotal mediator of soil nitrogen mineralization and availability","authors":"Ahmed S. Elrys ,&nbsp;Jinbo Zhang ,&nbsp;Lei Meng ,&nbsp;Pierfrancesco Nardi ,&nbsp;Christoph Müller","doi":"10.1016/j.still.2025.106533","DOIUrl":"10.1016/j.still.2025.106533","url":null,"abstract":"<div><div>The supply of nitrogen (N) to plants depends largely on soil organic matter content, but clay has a stabilizing effect on organic matter, protecting it from microbial attack, which may ultimately affect soil N mineralization rate. The clay-to-carbon ratio has recently been selected as an indicator of soil organic matter status. However, whether the clay-to-carbon ratio is relevant for assessing soil gross N mineralization rate (GNM) remains uncertain. By analyzing 1851 observations from 420 ¹⁵N-labelled studies, we found a significant and negative relationship between the clay-to-carbon ratio and both GNM and NH₄⁺-N concentration globally and across soil layers, land uses and climatic regions. Decreased clay-to-carbon ratio accelerated GNM via increasing soil microbial biomass, total N, and fungal abundance. The effect of soil pH, aridity and temperature on GNM is mediated through the clay-to-carbon ratio. Higher soil pH, aridity and temperature inhibited GNM by increasing the clay-to-carbon ratio. Thus, the higher the clay content, the more organic matter is required to ensure a high N supply to plants, especially in arid soils with high pH. Overall, incorporating the clay-to-carbon ratio into next-generation conceptual models as a pivotal mediator of GNM improves predictions of soil N supply globally.</div></div>","PeriodicalId":49503,"journal":{"name":"Soil & Tillage Research","volume":"251 ","pages":"Article 106533"},"PeriodicalIF":6.1,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143591905","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":"Linking measurable and conceptual phosphorus pools (in APSIM) enables quantitative model initialisation","authors":"Yunru Lai ,&nbsp;Jonathan J. Ojeda ,&nbsp;Simon Clarendon ,&nbsp;Nathan Robinson ,&nbsp;Enli Wang ,&nbsp;Keith G. Pembleton","doi":"10.1016/j.still.2025.106532","DOIUrl":"10.1016/j.still.2025.106532","url":null,"abstract":"<div><div>Phosphorus (P) is an essential plant macro-nutrient, yet it is deficient in 65 % of agricultural soils worldwide. Agricultural systems models enable the integration of plant-soil-climate-management interactions to investigate crop responses to P fertilisation and improve P use efficiency. However, current models cannot align their modellable P pools with values obtained from soil tests. This limits their applicability since soil testing is the most widely used tool to assess soil P status, which is then used to predict fertiliser P requirements based on assumed crop P demand for optimal growth in the field. Our study introduces a modelling framework akin to inversely modelling in the Agricultural Production Systems sIMulator (APSIM) to quantitatively derive the most likely P modelling parameters for different soils and empirically link them to common soil P test values. The methodology was first tested using data from an 8-year alfalfa (syn. lucerne) experiment (1997–2004) on two soil types in the mid-west of the United States to establish the adequacy of the P modelling framework in APSIM. We then extended this approach to eight Australian soil types using a simulation study based on known wheat yield response curves to soil P tests to derive empirical relationships between the labile P values in APSIM and common soil test P values (Bray-2 P and Colwell P) for the soils studied. Cross-validation yielded an average <em>R</em>² of 0.98 and an average Lin’s Concordance Correlation Coefficient (CCC) of 0.92. Our work thus enables the initialisation of the labile P pool in APSIM using Bray-2 P and Colwell P data, enhancing the usability and accuracy of agricultural systems models in predicting crop P requirements and optimising P fertiliser use across diverse soil types in different agro-climatic regions.</div></div>","PeriodicalId":49503,"journal":{"name":"Soil & Tillage Research","volume":"251 ","pages":"Article 106532"},"PeriodicalIF":6.1,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143591903","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":"Predicting the spatial distribution of organic carbon in soil by combining machine learning algorithms and spline depth function in a part of Golestan Province, Iran","authors":"Maryam Emami ,&nbsp;Farhad Khormali ,&nbsp;Mohammad Reza Pahlavan-Rad ,&nbsp;Soheila Ebrahimi","doi":"10.1016/j.still.2025.106530","DOIUrl":"10.1016/j.still.2025.106530","url":null,"abstract":"<div><div>As a critical element of soil quality, soil organic carbon (SOC) constitutes nearly 75 % of the active carbon content in terrestrial ecosystems and is essential for agricultural productivity. Estimation of soil organic carbon is one of the requirements of effective soil management planning. The present paper aimed to test the performance of Cubist (Cu), Quantile Regression Forest (QRF), and Random Forest (RF) methods in predicting the distribution of SOC content at four soil depths of 0–15, 15–30, 30–60 and 60–100 cm in Golestan Province of Iran. To achieve this goal, the mentioned models were trained with 105 soil profiles across the study area using environmental covariates which had been obtained from DEM, rain and piezometric maps, and remote sensing data extracted from Landsat 7 ETM⁺. Results revealed that the mean SOC values varied between 0.39 % and 1.24 %. All three predictive models had the highest performance in predicting SOC at 15–30 cm depth (R² = 0.45, RMSE = 0.34, and MAE = 0.25). Although the predictive models were similar in terms of validation metrics criteria (R², RMSE, and MAE), the QRF predictions based on the Taylor diagram had a higher agreement with the measured SOC distribution, resulting in the identification of QRF as the leading model in performance. Results of the present paper indicate the high potential of rainfall, piezometric, MRVBF, MRRTF, and valley depth to predict SOC concentration distributions. These findings will contribute to further research on SOC prediction models.</div></div>","PeriodicalId":49503,"journal":{"name":"Soil & Tillage Research","volume":"251 ","pages":"Article 106530"},"PeriodicalIF":6.1,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143591901","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":"Phosphorus fractions and their transformation in coupling with organic carbon cycling after seven-year manure application in subtropical soil","authors":"Jingjing Zhang ,&nbsp;Jiaqing Huang ,&nbsp;Jiong Wen ,&nbsp;Zhi Peng ,&nbsp;Nan Zhang ,&nbsp;Yanan Wang ,&nbsp;Yang Zhang ,&nbsp;Shiming Su ,&nbsp;Xibai Zeng","doi":"10.1016/j.still.2025.106535","DOIUrl":"10.1016/j.still.2025.106535","url":null,"abstract":"<div><div>Phosphorus (P) is a crucial macronutrient for crop yield. Repeated swine manure application can provide considerable amounts of P and organic carbon (C) for agricultural soils. However, a deeper understanding of the transformation of soil P fractions and their coupling with organic C cycling through chemical and biological processes is urgently needed to enhance P utilization efficiency and C sequestration. A seven-year swine manure application (SSMA) experiment was conducted at varying rates (0, 7.5, 15, 30, and 45 t·ha⁻¹ per year) to investigate the changes in P fractions, the coupling of P and C transformation, and the driving factors in acidic soils. The results revealed that SSMA significantly increased soil total P, predominantly as inorganic P (P_i), whereas organic P (P_o) exhibited a limited increase and plateaued at 15 t·ha⁻¹ manure application. The 15–45 t·ha⁻¹ manure treatments dramatically enhanced the nonstable P fractions, particularly pH- and Ca-induced Ca₈-P; moreover, Ca₈-P had a greater impact on Olsen-P than Fe-P and Al-P. SSMA promoted P mobilization by increasing alkaline phosphatase activity and the abundance of P-cycling functional genes. However, the primary factors directly affecting nonstable P fractions were the elevated soil pH and soil organic carbon (SOC). Additionally, nonstable P fractions were positively correlated with O-aryl-C and ketone-C components. Swine manure applications altered organic C components by stimulating SOC-driven enzyme activities involved in organic C degradation. Organic C components were also influenced by available P and N, primarily through the abundance of genes involved in organic C fixation rather than C degradation. Furthermore, 45 t·ha⁻¹ SSMA treatment restricted the increase in the abundance of P-cycling genes, most C-cycling genes, and dominant bacteria harboring P-cycling genes. This study provides critical insights into the coupling transformation mechanisms of P and C and highlights that excessive swine manure application impairs functional bacterial growth and organic C storage in addition to increasing the risk of P loss in agricultural soils.</div></div>","PeriodicalId":49503,"journal":{"name":"Soil & Tillage Research","volume":"251 ","pages":"Article 106535"},"PeriodicalIF":6.1,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143591902","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":"Design and evaluation of bio-inspired electro-osmosis system for reducing soil adhesion on agricultural equipment","authors":"Le Yang ,&nbsp;Zhihong Zhang ,&nbsp;Baoping Yan ,&nbsp;Shuo Yuan ,&nbsp;Fu Zhang","doi":"10.1016/j.still.2025.106521","DOIUrl":"10.1016/j.still.2025.106521","url":null,"abstract":"<div><div>Enhancing the efficiency of agricultural field operations is crucial, but soil adhesion to soil-engaging tools poses a major obstacle, causing energy waste and reduced productivity. This research investigates a novel solution inspired by the anti-adhesion properties of earthworms, aiming to reduce soil adherence to agricultural equipment using a bio-inspired electro-osmosis system. The study details the design, optimization, and experimental testing of this system. The initial phase involved single-factor experiments to investigate the correlation between soil moisture content and adhesion force. The effects of variables such as the ratio of positive to negative surface areas, operating voltage, and voltage waveform on soil adhesion were thoroughly examined. A central composite design was employed to set up an experimental model, and regression analysis was performed using Design-Expert software. Results indicated that soil adhesion force increases with rising soil moisture content. Optimal conditions for maximum adhesion reduction were found to be a 1:2 <em>area ratio</em> for positive and negative surfaces, 12 V operating voltage, and alternating current. The regression model showed a strong correlation (<em>R</em>^<em>2</em>=0.981) between predicted and experimental data, with response surface plots revealing significant interactions between operating variables and adhesion force. The practical application of the electro-osmosis system was evaluated through field tests using a bio-inspired shovel blade designed with optimized parameters. Field tests confirmed that the bio-inspired shovel blade reduced horizontal traction force by 6.55 % and reduced soil adhesion by 52.84 % compared to a conventional shovel blade. This study presents a novel approach to reducing soil adhesion on agricultural tools by developing a bio-inspired electro-osmosis system that effectively replicates earthworm surface structures and electro-osmosis properties. These findings have profound implications for improving the sustainability and efficiency of agricultural operations.</div></div>","PeriodicalId":49503,"journal":{"name":"Soil & Tillage Research","volume":"251 ","pages":"Article 106521"},"PeriodicalIF":6.1,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143547854","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":"Effects of grazing on soil spatial heterogeneity depend on herbivore assemblages and components of heterogeneity","authors":"Yue Bai ,&nbsp;Tongtong Xu ,&nbsp;Yue Huang ,&nbsp;Mingrui Song ,&nbsp;Beilong Xie ,&nbsp;Lei Zhang ,&nbsp;Jiaru Wu ,&nbsp;Chen Liu","doi":"10.1016/j.still.2025.106520","DOIUrl":"10.1016/j.still.2025.106520","url":null,"abstract":"<div><div>The spatial heterogeneity of soil limiting resources, particularly nitrogen (N) and phosphorus (P), are vital for maintaining grassland productivity, biodiversity, and ecosystem functions. Grazing by large herbivores is a prevalent land use in grasslands, significantly modifying nutrient cycling and spatial heterogeneity. However, the differential impacts of various herbivore assemblages on the spatial heterogeneity of soil N and P, and their association with heterogeneity components (compositional and configurational heterogeneity), remain inadequately understood. Here, we conducted a 7-year field experiment in the Horqin sandy grassland of northeast China to assess the effects of different herbivore assemblages (no grazing, cattle grazing, sheep grazing, and mixed grazing of cattle and sheep) on the spatial heterogeneity of soil N and P. Our findings indicate that the effects of herbivore grazing on spatial heterogeneity of soil limiting resources are strongly dependent on herbivore assemblages and the components of heterogeneity. All herbivore species impacted soil configurational heterogeneity, while their impact on compositional heterogeneity was negligible. This suggests that grazing primarily modifies the spatial distribution patterns of limiting resources rather than altering nutrient content variability. Variation partitioning analysis revealed that herbivore grazing increased the spatial heterogeneity of soil N and P mainly by changing the plant community characteristics, such as diversity and composition, with a lesser contribution from the direct return of animal excreta. Cattle grazing significantly increased plant community heterogeneity and legume abundance, leading to increased configurational heterogeneity of all soil limiting resources, especially inorganic N. In contrast, mixed grazing and sheep grazing exhibited inconsistent effects on soil configurational heterogeneity, ranging from weak to strong spatial dependence. Our results suggest cattle grazing plays a significant role in promoting the spatial heterogeneity of both plant community and soil limiting resources in intensively managed grasslands. We emphasize that configurational heterogeneity is highly sensitive and critical for evaluating the responses of grazing on soil nutrient heterogeneity, providing valuable evidence for the spatial impacts of large herbivores on grassland ecosystems.</div></div>","PeriodicalId":49503,"journal":{"name":"Soil & Tillage Research","volume":"251 ","pages":"Article 106520"},"PeriodicalIF":6.1,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143563818","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":"Is the topsoil carbon sequestration potential underestimated of agricultural soils under best management?","authors":"Zheng Zhao ,&nbsp;Tong Li ,&nbsp;Kun Cheng ,&nbsp;Genxing Pan","doi":"10.1016/j.still.2025.106528","DOIUrl":"10.1016/j.still.2025.106528","url":null,"abstract":"<div><div>Enhancing soil carbon (C) sequestration has been globally advocated as a nature-based solution for climate change mitigation. Best management practices (BMPs) can increase soil organic carbon (SOC) content and improve soil structure in the topsoil. However, when estimating changes in SOC stock under BMPs, a default soil depth is often used without considering that BMPs may alter the topsoil depth (through volume expansion in line with the changes in bulk density), potentially leading to an underestimation of C sequestration. To achieve a more robust estimate of SOC stock change, it is necessary to rectify soil depth. In this study, our findings indicate that using a fixed-depth approach to estimate SOC stock may result in a 25.2 % underestimation of SOC stock increase under BMPs. This suggests that under BMPs, using the calibrated-depth approach based on equivalent soil mass can estimate SOC stock more accurately by considering soil depth changes. Additionally, we propose further validation of the calibrated-depth approach's applicability and emphasize that robust soil depth and precise bulk density measurements should be followed to assist more accurately monitoring SOC stock changes.</div></div>","PeriodicalId":49503,"journal":{"name":"Soil & Tillage Research","volume":"250 ","pages":"Article 106528"},"PeriodicalIF":6.1,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143534266","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":"Microbial inoculants addition increases microbial necromass but decreases plant lignin contribution to soil organic carbon in rice paddies","authors":"Quanyi Hu ,&nbsp;Xuelin Zhang ,&nbsp;Ziwei Zhang ,&nbsp;Ruofei Wang ,&nbsp;Cheng Feng ,&nbsp;Yingxin Xie ,&nbsp;Shaojie Chen ,&nbsp;Tianqi Liu","doi":"10.1016/j.still.2025.106529","DOIUrl":"10.1016/j.still.2025.106529","url":null,"abstract":"<div><div>Microbial inoculants have the potential to facilitate the degradation of crop straw, thereby significantly affecting soil carbon (C) cycling and storage in agricultural ecosystems. However, the specific mechanisms by which microbial inoculants affect the accumulation of microbial- and plant -derived C in agricultural soils remain inadequately understood. To address this knowledge gap, field trials involving microbial inoculants were conducted at two experimental sites located in the Jianghan Plain and Songnen Plain. The objective was to investigate changes in soil microbial communities, extracellular enzyme activities, microbial biomarkers, plant biomarkers, as well as mineral-associated organic carbon (MAOC) and particulate organic carbon (POC). The addition of microbial inoculants increased substantially the soil bacterial abundance and associated extracellular enzyme activities. Additionally, the addition of microbial inoculants accelerated the degradation of lignin phenols in the soil while reducing the contribution of plant lignin to soil organic carbon (SOC). Moreover, they elevated both microbial necromass C content and its contribution to SOC. Although the addition of microbial inoculants had no significant effect on POC content, it increased the MAOC content. Notably, at the Songnen Plain, the addition of microbial inoculants led to a significant increase in SOC content. In contrast, no comparable effect on SOC was observed at the Jianghan Plain. Furthermore, the contribution of microbial necromass C to SOC was greater at the Jianghan Plain compared to the Songnen Plain, which was attributable to the higher mean annual temperature at the Jianghan Plain. Overall, the addition of microbial inoculants facilitated the degradation of plant lignin by enhancing soil microbial biomass and extracellular enzyme activities while concurrently increasing microbial necromass C and driving dynamic alterations in SOC. These findings underscore the potential implications of microbial inoculants for sustainable agricultural practices aimed at improving soil health.</div></div>","PeriodicalId":49503,"journal":{"name":"Soil & Tillage Research","volume":"250 ","pages":"Article 106529"},"PeriodicalIF":6.1,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143548190","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":"Characteristics and quantifications of soil acidification under different land uses and depths in northern subtropical China","authors":"Yue Dong ,&nbsp;Samuel Adingo ,&nbsp;Xiaodong Song ,&nbsp;Shuai Liu ,&nbsp;Yiting Hu ,&nbsp;Jianwei Zhang ,&nbsp;Lei Wang ,&nbsp;Cheng Ji ,&nbsp;Jidong Wang","doi":"10.1016/j.still.2025.106527","DOIUrl":"10.1016/j.still.2025.106527","url":null,"abstract":"<div><div>Extensive nitrogen (N) fertilization and intensified agriculture have greatly accelerated soil acidification in China. However, research has focused more on non-calcareous soils with pH &lt; 6.5. Until now, knowledge concerning the characteristics and rate of acidification of calcareous soils in northern China is still lacking. In this study, soil samples (n = 139) under different land uses (upland, paddy fields, and forests) and at different soil depths (0–20 cm, 20–40 cm) were collected from a typical northern subtropical agricultural region. The characteristics and drivers of soil acidification were evaluated based on the measurable results and quantification of the proton (H⁺) budget. Compared to historical data (n = 143) from the 1980s, the pH of the topsoil was decreased by 2.88 and 1.88 units in upland and paddy fields, respectively. Meanwhile, due to the selective uptake of cations over anions by crops, subsoil pH in upland and paddy fields also reduced significantly by 1.30 and 1.12 units, respectively. In contrast, no significant change in the soil pH was observed in the forests. In the study area, the soil acidification rates were 17.7 ± 3.2 and 13.5 ± 2.7 kmol ha⁻¹ yr⁻¹ for upland and paddy fields, respectively. N transformation was the dominant driver of soil acidification (63–77 %), followed by excess uptake of cations by crops (23–37 %), whereas the contribution of H⁺ deposition and HCO₃^- process was negligible (&lt;1 %). Quantitative results showed that soil acidification was more severe in upland than in paddy fields, with a faster decline in soil pH, a higher soil exchangeable acidity, a greater proportion of strongly acidic soils, and a 30 % higher soil acidification rate. This might be interpreted by the differences in N fertilization rate, water management, topographical distribution, and crop yields. Thus, our data suggest that strategies such as reducing the N fertilization rate, implementing appropriate water management strategies, practicing crop rotation, and adequate straw return could effectively mitigate soil acidification in northern subtropical China.</div></div>","PeriodicalId":49503,"journal":{"name":"Soil & Tillage Research","volume":"250 ","pages":"Article 106527"},"PeriodicalIF":6.1,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143529326","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}