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25 years of SUITMAs: Urban soils - a new research field in soil science. What makes these soils and the interest in these soils so special? 25 年的 SUITMAs:城市土壤--土壤科学的新研究领域。是什么让这些土壤和对这些土壤的兴趣变得如此特别?
IF 3.6 3区 农林科学 Q3 ENVIRONMENTAL SCIENCES Pub Date : 2024-08-01 DOI: 10.1007/s11368-024-03826-6
Wolfgang Burghardt

Purpose

Since the occurrence of humans, soil has been affected by them. Thus, rural areas have been modified. Currently, urban areas are increasing extensively. They are locations with a high population density that are impacted by settlements and industrial technologies. This paper shows how soils are further discriminated by urbanization.

Material and methods

A collection of observations and conclusions about the characteristics of natural and urban soils and the discrimination by interpretation of the particularities of discovered soils are presented. This view is enlarged by the specific features of the mode of human action and their effects on soil formation.

Results and discussion

The effects of humans on soils in rural areas are numerous. They concern effects from soil use, evolving soil fertility and raw material supply by mining. Changes in soil formation occur due to natural factors in the landscapes. Discussions about the nature of soils in urban areas stress the situation of a low soil age, that they become relicts, are highly disturbed, contain artifacts, and are mostly byproducts of human decisions. Based on the specific urban climate, there are zonal soils. Perceptions about what qualifies these soils to be separately designated as urban soils are presented. The new view of the differentiation of artifacts by their origin from heat-treated products allows a more precise definition of soils in urban areas. Soil formation can occur quickly.

Conclusion

Urban soil research is a wide field for discovering new modes of soil formation and the relationship between humans and soils.

目的自从有了人类,土壤就受到了影响。因此,农村地区发生了变化。目前,城市地区正在大量增加。它们是人口密度较高的地区,受到定居点和工业技术的影响。本文介绍了如何通过城市化进一步区分土壤。材料和方法本文收集了有关天然土壤和城市土壤特征的观察结果和结论,并通过对已发现土壤特殊性的解释进行了区分。结果与讨论人类对农村地区土壤的影响是多方面的。人类对农村地区土壤的影响是多方面的,包括对土壤的使用、土壤肥力的演变和采矿提供的原材料。土壤形成的变化是由于地貌中的自然因素造成的。关于城市地区土壤性质的讨论强调了土壤年龄较低的情况,即土壤成为遗迹,受到严重干扰,含有人工痕迹,并且大多是人类决策的副产品。根据特定的城市气候,土壤也有分区。本文介绍了对这些土壤被单独指定为城市土壤的认识。根据热处理产品的来源对人工制品进行区分的新观点可以更精确地定义城市地区的土壤。结论城市土壤研究是一个发现新的土壤形成模式以及人类与土壤关系的广阔领域。
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引用次数: 0
Prediction of soil moisture content using genetic algorithm-optimized backpropagation algorithm from spectral data 利用遗传算法优化的反向传播算法从光谱数据中预测土壤含水量
IF 3.6 3区 农林科学 Q3 ENVIRONMENTAL SCIENCES Pub Date : 2024-07-31 DOI: 10.1007/s11368-024-03868-w
Jiawei Wang, Dong Zhang, Yulu Zhang, Hu Liu, Linkang Zhou, Hua Jin

Purpose

Accurately assessing soil moisture content (SMC) is essential for applications in agriculture and ecological sustainability. However, the dynamic monitoring and assessment of SMC presents considerable challenges due to the intricate traditional methods and the ever-evolving environmental variables. Relevant research has indicated that visible and near-infrared (vis–NIR) spectra are a practical and cost-effective alternative for accurate and convenient estimation of SMC. Advances in technology and computer hardware have enabled spectral characteristics and computer vision algorithms to show enormous potential for rapid and non-destructive characterization of soil properties. The objective of this study was to evaluate the predicted ability of SMC using vis–NIR spectral data.

Materials and methods

A total of 60 topsoil samples (0–5 cm) from the maize test field at the Shanxi Central Irrigation Test station were used as the study object. A set of four spectral parameters was derived and filtered from spectral data, and C-W and W-W models were developed using Genetic Algorithm algorithm-optimized backpropagation (GA-BP) neural networks to predict SMC based on outdoor measurements.

Results and discussion

The results showed that: (1) SMC can be successfully predicted using the spectral data through the C-W and W-W models; (2) the C-W model outperformed the W-W model, particularly in the context of deep soil, with R2 ranging from 0.919 to 0.991 and corresponding RMSE values from 0.619% to 0.982%.

Conclusions

This study introduces two effective methodologies for accurate estimation of SMC at different depths using multispectral remote sensing, which showed a high degree of prediction accuracy. It further proves that GA-BP algorithm is still effective for predicting SMC in outdoor. The research result might be helpful for the further study of SMC measurement.

目的准确评估土壤含水量(SMC)对于农业应用和生态可持续性至关重要。然而,由于传统方法的复杂性和环境变量的不断变化,土壤含水量的动态监测和评估面临着相当大的挑战。相关研究表明,可见光和近红外(vis-NIR)光谱是准确、方便地估算 SMC 的一种实用且具有成本效益的替代方法。技术和计算机硬件的进步使得光谱特性和计算机视觉算法在快速、无损地表征土壤特性方面显示出巨大的潜力。本研究的目的是利用可见近红外光谱数据评估 SMC 的预测能力。利用遗传算法-优化反向传播(GA-BP)神经网络建立 C-W 和 W-W 模型,根据室外测量结果预测 SMC:(1) 通过 C-W 和 W-W 模型,可以利用光谱数据成功预测 SMC;(2) C-W 模型的性能优于 W-W 模型,尤其是在深层土壤方面,R2 为 0.919 至 0.991,相应的 RMSE 值为 0.619% 至 0.982%。它进一步证明了 GA-BP 算法在预测室外 SMC 方面仍然有效。该研究成果可能有助于对 SMC 测量的进一步研究。
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引用次数: 0
Variations in iron-bound organic carbon in soils along an altitude gradient and influencing factors in a subtropical mountain ecosystem of southern China 中国南方亚热带山地生态系统土壤中铁结合有机碳沿海拔梯度的变化及其影响因素
IF 3.6 3区 农林科学 Q3 ENVIRONMENTAL SCIENCES Pub Date : 2024-07-30 DOI: 10.1007/s11368-024-03873-z
Kai Xiong, Xinyu Jiang, Shaoqiang Huang, Jinshun Guan, Xiangbo Zou, Chuangting Chen, Tiancheng Zhou, Cao Kuang, Ji Ye, Shiqin Yu, Heng Jiang, Bin Huang

Purpose

The main factors governing iron-bound organic carbon (Fe-bound OC) formation under different environmental conditions have been less well identified. In this study, we investigated the distribution of Fe-bound OC and the influencing factors in soils of a typical subtropical mountain ecosystem.

Materials and methods

Soil samples at different altitudes (402–1653 m) and depths (0–20 cm, 20–40 cm, and 40–60 cm) in the Nanling Mountains of southern China were collected. The influence of soil property indicators and microbial diversity characteristics on the formation of Fe-bound OC was explored.

Results

The Fe-bound OC content in the soils ranged from 1.40 ± 1.32 g/kg to 15.09 ± 3.57 g/kg, accounting for an average of 23.49 ± 13.03% of the total organic carbon (TOC), and generally increased with altitude and exhibited significantly higher values at the soil depth of 0–20 cm, while its proportion to TOC (fFe-OC) gradually increased as soil depth increased. The more significant indicators in explaining the variation of Fe-bound OC include TOC, particulate organic carbon (POC), free iron oxides (Fed), amorphous iron oxides (Feo), complexed iron oxides (Fep), Feo/Fed, pH, Ca, sand and silt. Feo/Fed was strongly linearly correlated with Fe-bound OC, thus can be a good predictor of Fe-bound OC content. RDA analysis showed that Fe-bound OC/fFe-OC had a relatively closer correlation with bacterial phyla including Proteobacteria, Actinobacteriota, Chloroflexi and Firmicutes.

Conclusions

The attitude gradient and soil depth significantly influence the content of Fe-bound OC. The distribution of Fe-bound OC exhibited a certain correlation with both biotic and abiotic factors.

目的 在不同环境条件下,影响铁结合有机碳(Fe-bound OC)形成的主要因素尚不十分明确。材料与方法在中国南方南岭山区采集了不同海拔(402-1653 m)、不同深度(0-20 cm、20-40 cm、40-60 cm)的土壤样品。结果土壤中铁结合有机碳的含量从1.40±1.32 g/kg到15.09±3.57 g/kg不等,平均占总有机碳(TOC)的23.49±13.03%,且随海拔的升高而升高,在0-20 cm深度的土壤中铁结合有机碳的含量显著升高,其占TOC的比例(fFe-OC)随土壤深度的增加而逐渐升高。解释铁结合有机碳变化的重要指标包括 TOC、颗粒有机碳 (POC)、游离铁氧化物 (Fed)、无定形铁氧化物 (Feo)、络合铁氧化物 (Fep)、Feo/Fed、pH 值、Ca、砂和淤泥。Feo/Fed 与铁结合 OC 呈强线性相关,因此可以很好地预测铁结合 OC 的含量。RDA 分析表明,Fe-bound OC/Fe-OC 与细菌门(包括变形菌、放线菌、绿霉菌和腐生菌)的相关性较近。结合铁的有机碳的分布与生物和非生物因素有一定的相关性。
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引用次数: 0
The occurrence of selected organic pollutants in the soils of the Songnen Plain, China 中国松嫩平原土壤中部分有机污染物的出现
IF 3.6 3区 农林科学 Q3 ENVIRONMENTAL SCIENCES Pub Date : 2024-07-29 DOI: 10.1007/s11368-024-03876-w
Yanan Chen, Yichen Zhang, Jiquan Zhang, Chenyang Wu, Lili, Qiuling Lang, Huanan Liu

Purpose

To protect and improve the soil environment of the Songnen Plain, detailed identification of organic pollutant contamination features in the soil and the degree of contamination is required. The primary goals of this research are to measure the levels of organic pollutants detected in the soil of the Songnen Plain, to correlate the levels of organic pollutants with different land use practices, and to assess the environmental quality of the soil using various pollution indicators.

Material and methods

Contaminated soil was collected at three types of areas: residential (n = 26), agricultural (n = 22), and industrial (n = 12) in the Songnen Plain of Jilin Province, at 0–20 cm and 20–40 cm depths. The concentrations of dichlorodiphenyltrichloroethane, benzene hexachloride, toluene, ethylbenzene, xylene, benzo (a) pyrene (BaP), trichloromethane, tetrachloromethane, hexachlorobenzene, and atrazine in the soil samples were determined using gas chromatography (GC), gas chromatograph-mass spectrometer-mass spectrometer (GC-MS-MS), and high-performance liquid chromatography (HPLC).

Results and discussion

Soil BaP had the highest concentration with a mean value of 20.59 ng/kg, followed by atrazine, hexachlorobenzene, benzene hexachloride, dichlorodiphenyltrichloroethane (DDT), trichloromethane, toluene, ethylbenzene, xylene, and tetrachloromethane with mean concentrations of 0.46, 0.44, 0.34, 0.28, 0.21, 0.14, 0.06, 0.03, and 0.02 ng/kg, respectively. Soil organic pollutants at all sampling sites did not exceed the secondary environmental quality standard values. The most serious soil contamination was found in landfill sites, followed by urban areas, industrial areas and farmland areas.

Conclusions

Soil contamination is more severe in locations where human activity is more prevalent. The subsoil can better reflect the characteristics of soil pollution in the area compared to the upper layer of soil. Although contamination is low in the research region, the presence of these pollutants must be taken seriously in order to maintain the quality and safety of agricultural products and human health.

目的为了保护和改善松嫩平原的土壤环境,需要详细查明土壤中有机污染物的污染特征和污染程度。本研究的主要目标是测定松嫩平原土壤中有机污染物的含量,将有机污染物的含量与不同的土地利用方式相关联,并利用各种污染指标评估土壤的环境质量。采用气相色谱法(GC)、气相色谱-质谱-质谱联用仪(GC-MS-MS)和高效液相色谱法(HPLC)测定了土壤样品中二氯二苯三氯乙烷、六氯化苯、甲苯、乙苯、二甲苯、苯并(a)芘(BaP)、三氯甲烷、四氯甲烷、六氯苯和阿特拉津的浓度。结果与讨论土壤中的苯并[a]芘浓度最高,平均值为 20.59 纳克/千克,其次是阿特拉津、六氯苯、六氯化苯、二氯二苯基三氯乙烷(DDT)、三氯甲烷、甲苯、乙苯、二甲苯和四氯甲烷,平均浓度分别为 0.46、0.44、0.34、0.28、0.21、0.14、0.06、0.03 和 0.02 纳克/千克。所有采样点的土壤有机污染物均未超过二级环境质量标准值。垃圾填埋场的土壤污染最为严重,其次是城市地区、工业区和农田地区。与上层土壤相比,底层土壤更能反映该地区的土壤污染特征。虽然研究区域的污染程度较低,但必须重视这些污染物的存在,以维护农产品的质量安全和人类健康。
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引用次数: 0
Evaluation of hazardous element accumulation in urban soils of Cracow, Lublin and Torun (Poland): pollution and ecological risk indices 克拉科夫、卢布林和托伦(波兰)城市土壤中有害元素积累的评估:污染和生态风险指数
IF 3.6 3区 农林科学 Q3 ENVIRONMENTAL SCIENCES Pub Date : 2024-07-27 DOI: 10.1007/s11368-024-03864-0
Andrzej Plak, Małgorzata Telecka, Przemysław Charzyński, Agnieszka Hanaka

Purpose

This study assesses how urban soil transformation affects pollution levels and ecological risks in Cracow, Lublin, and Torun using specific geochemical indices.

Methods

The surveyed cities, namely Cracow, Lublin and Torun, are among the oldest in Poland, with origins dating back to the Middle Ages. Moreover, they did not experience significant destruction during World War II. A total of 135 sampling points were selected from three cities, and topsoil samples (0–20 cm) were collected from various areas, including industrial, residential, recreational areas, wastelands, traffic routes, allotments, cultivated fields, forests and cemeteries (45 topsoil samples in each city). The concentration of 8 elements (As, Cd, Cu, Cr, Ni, Pb, Sb, Zn) was measured to determine pollution and ecological risk indicators, such as geoaccumulation index (Igeo), pollution load index (PLI), cancer risk (CR), and ecological risk assessment (ERi).

Results

Findings reveal significant differences among the cities, with Cracow showing the highest pollution and ecological risk levels, influenced primarily by industrial activities. Igeo above 3 was found for Sb (4% of the sample population), Cr (33%), Ni (31%), Cd, Pb, Cu, Zn (11%). In the other two cities, high Igeo values occurred sporadically with most values ranging from 0 to 2. The concentrations of Cd, Pb, Sb, Cr and Ni were found to be highest in industrial areas, transportation areas and urban wastelands, and the lowest in the study plots located in forests. In Cracow, almost 58% of the surveyed areas are polluted. Almost the entire area of Torun (87%) shows high values of summed ecological risk assessment (PERk). Lublin is characterized by the lowest ecological risk, almost 32% of the surveyed areas are polluted (PERk—high and very high).

Conclusions

The application of pollution and ecological risk indicators allowed for the identification of elevated heavy metal and metalloid concentrations in the studied soils and evaluation of disease risk in people. The data were strongly correlated with the level of anthropogenic pressure, which varied depending on the different land use.

目的 本研究使用特定的地球化学指数,评估城市土壤的变化如何影响克拉科夫、卢布林和托伦的污染水平和生态风险。方法 被调查的城市,即克拉科夫、卢布林和托伦,是波兰最古老的城市之一,其起源可追溯到中世纪。此外,它们在第二次世界大战期间也没有遭受严重破坏。三个城市共选取了 135 个采样点,并从不同区域采集了表土样本(0-20 厘米),包括工业区、住宅区、娱乐区、荒地、交通线路、分配区、耕地、森林和墓地(每个城市采集 45 个表土样本)。测量了 8 种元素(砷、镉、铜、铬、镍、铅、锑、锌)的浓度,以确定污染和生态风险指标,如地质累积指数 (Igeo)、污染负荷指数 (PLI)、癌症风险 (CR) 和生态风险评估 (ERi)。锑(占样本人口的 4%)、铬(33%)、镍(31%)、镉、铅、铜、锌(11%)的 Igeo 超过 3。镉、铅、锑、铬和镍的浓度在工业区、交通区和城市荒地中最高,而在位于森林中的研究地块中最低。在克拉科夫,近 58% 的调查区域受到污染。托伦几乎整个地区(87%)的生态风险评估总和 (PERk) 值都很高。卢布林的生态风险最低,近 32% 的调查区域受到污染(PERk 高和非常高)。这些数据与人为压力水平密切相关,而人为压力水平因不同的土地用途而异。
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引用次数: 0
Soil nutrients, phosphatase activities and phosphorus species distribution in soils amended sheep manure biochar 羊粪生物炭改良土壤中的土壤养分、磷酸酶活性和磷的种类分布
IF 3.6 3区 农林科学 Q3 ENVIRONMENTAL SCIENCES Pub Date : 2024-07-24 DOI: 10.1007/s11368-024-03869-9
Seyed Hamid Hosseini, Xinqiang Liang, Christophe Niyungeko, Seyedeh Fatemeh Zakeritabar

Purpose

Sheep manure-derived biochar (SMB) is applied to enhance soil productivity, but its impacts on soil phosphorus (P) species distribution have not been thoroughly investigated. This research aimed to explore the effects of SMB amended soil on phosphatase activities, nutrients, P species distribution, and the underlying mechanisms in agricultural soil.

Materials and methods

The soils (collected from rice and tea cultivation) were incubated for a period of 92 days receiving different rates of biochars 0% (CK), 2% (T1) and 4% (T2) respectively. The SMB was manufactured at 500°C, and P species were tested via 31P NMR spectroscopy. Acid phosphomonoesterase (ACP) activities, CEC, NH4+–N, pH, NO3–N, Olsen‒ P and alkaline phosphomonoesterase (ALP) were determined.

Results and discussion

The findings suggested that the SMB addition enhanced the pH, NO3–N, Olsen‒ P, CEC, NH4+–N contents in both paddy and tea soils. Furthermore, compared with CK (control), application of SMB at T2 reduced the ACP activities by 85.9 and 74.8%, but promoted the ALP activities by 89.1 and 70.6% for paddy and tea soils, respectively. The findings showed that major forms of P were orthophosphate and orthophosphate monoesters.

Conclusions

The SMB application increased soil inorganic P, P availability and ALP activities as a result of increasing of P availability by decomposition of organic P. Our research showed that the SMB application is an alternative nutrient for plants instead of chemical fertilizers. Nevertheless, care should be taken with the long-term SMB application, consequently excessive nutrient utilization has the potential to induce eutrophication in aquatic environments.

目的应用羊粪衍生生物炭(SMB)可提高土壤生产力,但其对土壤磷(P)种类分布的影响尚未得到深入研究。本研究旨在探讨 SMB 改良土壤对农用土壤中磷酸酶活性、养分、磷种类分布的影响及其内在机制。在 500°C 的温度下制造 SMB,并通过 31P NMR 光谱检测 P 的种类。结果与讨论结果表明,添加 SMB 后,水稻土和茶叶土中的 pH 值、NO3-‾-N、Olsen- P、CEC、NH4+-N 含量均有所提高。此外,与 CK(对照)相比,在 T2 施用 SMB 会使水稻土和茶叶土的 ACP 活性分别降低 85.9% 和 74.8%,但会使 ALP 活性分别提高 89.1% 和 70.6%。我们的研究表明,施用 SMB 是替代化肥的一种植物养分。不过,长期施用 SMB 应谨慎小心,因为养分的过度利用有可能导致水生环境富营养化。
{"title":"Soil nutrients, phosphatase activities and phosphorus species distribution in soils amended sheep manure biochar","authors":"Seyed Hamid Hosseini, Xinqiang Liang, Christophe Niyungeko, Seyedeh Fatemeh Zakeritabar","doi":"10.1007/s11368-024-03869-9","DOIUrl":"https://doi.org/10.1007/s11368-024-03869-9","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Purpose</h3><p>Sheep manure-derived biochar (SMB) is applied to enhance soil productivity, but its impacts on soil phosphorus (P) species distribution have not been thoroughly investigated. This research aimed to explore the effects of SMB amended soil on phosphatase activities, nutrients, P species distribution, and the underlying mechanisms in agricultural soil.</p><h3 data-test=\"abstract-sub-heading\">Materials and methods</h3><p>The soils (collected from rice and tea cultivation) were incubated for a period of 92 days receiving different rates of biochars 0% (CK), 2% (T<sub>1</sub>) and 4% (T<sub>2</sub>) respectively. The SMB was manufactured at 500°C, and P species were tested via <sup>31</sup>P NMR spectroscopy. Acid phosphomonoesterase (ACP) activities, CEC, NH<sub>4</sub><sup>+</sup>–N, pH, NO<sub>3</sub><sup>‾</sup>–N, Olsen‒ P and alkaline phosphomonoesterase (ALP) were determined.</p><h3 data-test=\"abstract-sub-heading\">Results and discussion</h3><p>The findings suggested that the SMB addition enhanced the pH, NO<sub>3</sub><sup>‾</sup>–N, Olsen‒ P, CEC, NH<sub>4</sub><sup>+</sup>–N contents in both paddy and tea soils. Furthermore, compared with CK (control), application of SMB at T<sub>2</sub> reduced the ACP activities by 85.9 and 74.8%, but promoted the ALP activities by 89.1 and 70.6% for paddy and tea soils, respectively. The findings showed that major forms of P were orthophosphate and orthophosphate monoesters.</p><h3 data-test=\"abstract-sub-heading\">Conclusions</h3><p>The SMB application increased soil inorganic P, P availability and ALP activities as a result of increasing of P availability by decomposition of organic P. Our research showed that the SMB application is an alternative nutrient for plants instead of chemical fertilizers. Nevertheless, care should be taken with the long-term SMB application, consequently excessive nutrient utilization has the potential to induce eutrophication in aquatic environments.</p>","PeriodicalId":17139,"journal":{"name":"Journal of Soils and Sediments","volume":null,"pages":null},"PeriodicalIF":3.6,"publicationDate":"2024-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141774900","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Microstructural Analysis on Shear Behavior of New-fill and Silt Interface in Check Dam 拦河坝新填土与淤泥界面剪切行为的微结构分析
IF 3.6 3区 农林科学 Q3 ENVIRONMENTAL SCIENCES Pub Date : 2024-07-23 DOI: 10.1007/s11368-024-03856-0
Ya Wang, Hongyu Wang, Liping Guo

Purpose

The interface between newly-filled soil and silted soil in a check dam is commonly acknowledged as the most vulnerable plane in the upstream heightening technique, posing a significant threat to dam stability. The objective was to investigate the microscopic shear failure mechanism in " soft–soft (or soil-soil) " interlayers under different working conditions, aiming to establish a theoretical foundation for dam hazard mitigation and reinforcement.

Materials and methods

Direct shear tests were initially conducted on the interface between new-fill and silt soils, considering different water contents and compactness coefficients in the silt soil. Subsequently, scanning electron microscopy (SEM) technique and Image J software were employed to extract microscopic parameters from the sheared samples. By integrating macroscopic failure patterns with microscopic parameters, a qualitative analysis was established to investigate how water content and compaction degree influence the shear properties and deformations, ultimately revealing the failure mechanism of interface shearing.

Results and discussion

A typical triple-stage (fluctuation, climbing, stable) hardening phenomenon occurred in the stress-displacement curve during direct shear test. The shear strength showed a positive correlation with compaction coefficient but an inverse relationship with water content. Cohesion of the contact surface increased initially and decreased as water content raised, whereas it changed slightly with the increase of compaction. The internal friction angle increased with the development of compactness degree but decreased with increasing water content. SEM images illustrated a progressive morphology transformation in the contact surface, from granular to laminar to an aggregated pattern. Microscopic parameters such as pore morphology properties, pore size distribution as well as pore spatial distributions were directly bonded with macro properties.

Conclusions

The compaction of silt plays a crucial role in adhesive force and structure of particles at soil-soil interface, thereby leading to the occurrence of "optimal bonding" and the variation of shear strength. The shear failure of contact surface is characterized by progressive failure. Besides, the water content and compaction degree of soft soil has a significant influence on the progressive failure.

目的 拦河坝新填土与淤积土之间的界面被公认为是上游加高技术中最脆弱的平面,对大坝稳定性构成重大威胁。本研究旨在研究不同工况下 "软-软(或土-土)"夹层的微观剪切破坏机理,从而为大坝减险加固奠定理论基础。随后,利用扫描电子显微镜(SEM)技术和 Image J 软件提取剪切样品的微观参数。结果与讨论 在直接剪切试验中,应力-位移曲线出现了典型的三阶段(波动、爬升、稳定)硬化现象。剪切强度与压实系数呈正相关,但与含水量呈反比。接触面的内聚力最初增大,随着含水量的增加而减小,而随着压实度的增加,内聚力略有变化。内摩擦角随着压实度的增加而增大,但随着含水量的增加而减小。扫描电子显微镜图像显示了接触面的渐进形态变化,从颗粒状到层状再到聚集形态。淤泥的压实度对土土界面颗粒的粘附力和结构起着至关重要的作用,从而导致 "最佳粘结 "的发生和剪切强度的变化。接触面的剪切破坏具有渐进破坏的特点。此外,软土的含水量和压实度对渐进破坏也有显著影响。
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引用次数: 0
Trace metal contamination and bioaccessibility in two Ulster County Urban Community Gardens, New York State (USA) 美国纽约州阿尔斯特县两个城市社区花园的痕量金属污染和生物可及性
IF 2.8 3区 农林科学 Q3 ENVIRONMENTAL SCIENCES Pub Date : 2024-07-15 DOI: 10.1007/s11368-024-03865-z
Salvatore Engel-Di Mauro, Megan Ferguson, Jeffrey Kitchen, Alice Rojas, Taiyo Cannizzo
{"title":"Trace metal contamination and bioaccessibility in two Ulster County Urban Community Gardens, New York State (USA)","authors":"Salvatore Engel-Di Mauro, Megan Ferguson, Jeffrey Kitchen, Alice Rojas, Taiyo Cannizzo","doi":"10.1007/s11368-024-03865-z","DOIUrl":"https://doi.org/10.1007/s11368-024-03865-z","url":null,"abstract":"","PeriodicalId":17139,"journal":{"name":"Journal of Soils and Sediments","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141647839","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Reduced nitrogen fertilizer application mitigated CH4 fluxes from rice paddies under an elevated CO2 concentration 减少氮肥施用量可减轻二氧化碳浓度升高条件下稻田的甲烷通量
IF 2.8 3区 农林科学 Q3 ENVIRONMENTAL SCIENCES Pub Date : 2024-07-15 DOI: 10.1007/s11368-024-03863-1
Yuanyuan Wang, Zhenghua Hu, Botao Gu, Jingjing Xing, Xinying Hu, Yutong Xu
{"title":"Reduced nitrogen fertilizer application mitigated CH4 fluxes from rice paddies under an elevated CO2 concentration","authors":"Yuanyuan Wang, Zhenghua Hu, Botao Gu, Jingjing Xing, Xinying Hu, Yutong Xu","doi":"10.1007/s11368-024-03863-1","DOIUrl":"https://doi.org/10.1007/s11368-024-03863-1","url":null,"abstract":"","PeriodicalId":17139,"journal":{"name":"Journal of Soils and Sediments","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141646292","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Mapping legacy lead: socioeconomic and demographic connections in urban soil contamination in Lafayette, LA 绘制遗留铅地图:洛杉矶拉斐特城市土壤污染中的社会经济和人口联系
IF 2.8 3区 农林科学 Q3 ENVIRONMENTAL SCIENCES Pub Date : 2024-07-15 DOI: 10.1007/s11368-024-03861-3
Holly L. Heafner, Anna A. Paltseva
{"title":"Mapping legacy lead: socioeconomic and demographic connections in urban soil contamination in Lafayette, LA","authors":"Holly L. Heafner, Anna A. Paltseva","doi":"10.1007/s11368-024-03861-3","DOIUrl":"https://doi.org/10.1007/s11368-024-03861-3","url":null,"abstract":"","PeriodicalId":17139,"journal":{"name":"Journal of Soils and Sediments","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141644445","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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Journal of Soils and Sediments
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