oalib

OALib Journal期刊

ISSN: 2333-9721

费用：99美元

投稿

时间不限

( 2026 )

( 2025 )

( 2024 )

( 2023 )

自定义范围…

匹配条件： “Degraded Bauxite Soils” ，找到相关结果约1000条。
列表显示的所有文章，均可免费获取
第1页/共1000条
每页显示 条
Integrated Approach for the Agroecological Rehabilitation of Bauxitic Soils: Maize-Groundnut Intercropping for Rural and Economic Food Resilience  [PDF]
Rachel Honorine Camara, Oumar Dolo, Saa Gabriel Kondiano, Lonseny Traore
Agricultural Sciences (AS) , 2026, DOI: 10.4236/as.2026.174019
Abstract: This study assesses the agronomic, social, and environmental feasibility of rehabilitating a former bauxite mining site into agricultural land in Sangarédi, Guinea. The experiment was based on maize-groundnut intercropping, supported by an integrated organomineral amendment plan. This plan combined agricultural lime, composted poultry manure, superphosphate (P2O5), and NPK (17-17-17) to restore degraded soil fertility and sustainably improve yields. Results—7.88 tons of maize, of which 6.56 were marketed, 1.20 consumed locally, and only 0.12 lost—reflect an encouraging dynamic of progress, despite yield gaps of 13.50% for maize and 17.33% for groundnut compared to regional averages. The agroecological approach adopted contributes to biodiversity regeneration, restoration of soil ecological functions, and food and economic resilience for local communities. This reproducible model, adapted to Guinean agroclimatic conditions, offers perspectives for extension to other mining zones facing similar challenges.
Blue Carbon Sequestration Potential of Soils in Degraded Mangroves of Sundarban, India: A Geochemical Approach  [PDF]
Anubhav Das, Pratap Bhattacharyya, Somnath Khaoash, Sujit Kumar Nayak, Shiva Prasad Parida, Soumya Ranjan Padhy, Sarada Prasad Pradhan
American Journal of Climate Change (AJCC) , 2025, DOI: 10.4236/ajcc.2025.142013
Abstract: Mangrove ecosystems are important for global carbon sequestration, with their soils storing approximately 1.71 ± 0.17 Mg C ha？1 yr？1 of organic carbon. However, these ecosystems face challenge of degradation at a rate of nearly 42% as observed in the past decade in India. Moreover, degraded mangroves have become an integral part of the wetland ecosystems in Sundarbans. In this study, we investigate the geochemical interactions influencing soil carbon sequestration potential in degraded mangrove soils of the Indian Sundarbans. Soil samples were collected from three major estuaries: Bidyadhari, Hooghly and Matla up to 5 metre depths (at 1 m interval) with replications. Samples were analysed for total carbon (TC), soil organic carbon (SOC), major oxide compositions, trace element concentrations, and clay minerals. TC (0.67 - 0.94%) and SOC (0.58 - 0.73%) showed highest concentrations at 0 - 1 m soil depth due to greater organic inputs and declined with depth across all sites. Silicon dioxide (46% - 51%) and aluminium oxide (18% - 23%) were observed in higher concentrations across all sites which may contribute to clay-humus complexes with the potential to stabilize organic carbon. Trace elements showed stratified distributions influenced by redox cycling, tidal inputs, and anthropogenic inputs, particularly in Hooghly and Bidyadhari estuaries. Presence of Chromium (Cr), manganese (Mn) and zinc (Zn) indicated the potential to form insoluble oxides and hydroxides that could act as adsorption sites for organic carbon, thereby enhancing its stability. Secondary clay minerals like glauconite and argentopyrite indicated stable soil matrices that further supported carbon stabilization. This study emphasizes the geochemical characteristics of Sundarban degraded mangrove system in relation to carbon sequestration potential and factors influencing the soil carbon dynamics.
STRUCTURAL REMEDIATION OF AN ALFISOL BY MEANS OF SEWAGE SLUDGE AMENDMENTS IN ASSOCIATION WITH YELLOW SERRADELA (Ornithopus compressus L.)
Sandoval,M.A; Celis,J.E; Morales,P;
Journal of soil science and plant nutrition , 2011, DOI: 10.4067/S0718-95162011000100006
Abstract: wastewater treatment generates large amounts of sewage sludge, which when are disposed in highly degraded soils (with a complete loss of the a horizon and a great part of the b horizon), represent an interesting alternative to recover the aggregate level into soil. within the hierarchy of soil systems, the aggregate level is the one that integrates soil properties that are directly related to soil sustainability. the aim of this study was to determine the effect of different dose of sewage sludge and an annual legume on the structural recovery of a degraded alfisol. sludge was added to soil at 0, 15, 30 and 60 t ha-1 in treatments with and without yellow serradela (ornithopus compressus l.). after 6 months, the following structural indicators were identified: aggregate distribution, water aggregate stability and bulk density (da). results showed that the higher the sludge dose the higher the proportion of macroaggregates and their stability, whereas da decreased. in spite of the short-term study, data showed that there was a positive effect when amendments were combined with o. compressus l. it demonstrated that degradation is likely to be reversed, thus giving to soil more physical support.
Recupera？？o de solos degradados na explora？？o mineral de cassiterita: biomassa microbiana e atividade da desidrogenase
Longo, Regina M.;Ribeiro, Admilson írio;Melo, Wanderley José de;
Bragantia , 2011, DOI: 10.1590/S0006-87052011000100019
Abstract: the evaluation of the environmental quality assumes great importance in recovery programs of degraded areas, which makes necessary the development of quantitative systems based on combinations of indicators that best represent the degradation or the ongoing recovery conditions. this work uses soil biological parameters, such as microbian biomass and dehydrogenase activity, in addition to the analysis of the plant material to verify the influence of the successive planting of legumes in a mined soil undergoing recovery. the microbian activity was determined through the quantification of the microbian biomass' carbon and nitrogen (bmc e bmn), the dehydrogenase activity and fda hydrolysis, evaluated in a mine pit area after one, two and three years of consecutive planting of legumes, and in a tailing area after one year of planting a mixture of legumes (pigeon peas, velvet beans and sunn hemp). those areas were compared to forest soil and areas with no planting. the use of biological indicators (microbian biomass and dehydrogenase activity) and the analysis of plant material in the evaluation of the adopted techniques and strategies revealed that the planting of legumes and its further incorporation promoted positive and gradual modifications in the degraded soil, mainly in the bmc in areas after the consecutive planting of legumes over the course of three years.
Biological Activity in a Degraded Alfisol Amended with Sewage Sludge and Cropped with Yellow Serradela (Ornithopus compressus L.)
Celis H,José; Machuca H,Angela; Sandoval E,Marco; Morales C,Patricia;
Chilean journal of agricultural research , 2011, DOI: 10.4067/S0718-58392011000100020
Abstract: there are few studies about the impact of sewage sludge on the biological properties in alfisols of the chilean coastal range drylands. hence, the objective of this study was to evaluate its effect on the microbial respiration and enzymatic activities of a degraded alfisol located in the bío bío region (chile) that was cropped with yellow serradela (ornithopus compressus l.). sludge was added to the soil at rates of 15, 30, and 60 t ha-1; he following treatments were defined: l15-p = 15 t ha-1 sludge + o. compressus; l30-p = 30 t ha-1 sludge + o. compressus; l60-p = 60 t ha-1 sludge + o. compressus; l15 = 15 t ha-1 sludge; l30 = 30 t ha-1 sludge; l60 = 60 t ha-1 sludge; cp = non-amended soil, cropped; and c = non-amended soil, no crop. soil microorganism activity was evaluated by respirometry. hydrolytic enzyme activity representative of soil c, n, and p cycles was determined. crop phytomass development was also evaluated. the amount of c-co2 produced by soil microorganisms was directly proportional to the dose of amended sludge (p ≤ 0.05). similarly, greater β-glucosidase, urease, and acid phosphatase were more active at 60 t sludge ha-1. however, both respiratory and enzymatic activities were greater (p ≤ 0.05) in treatments with sludge-amended soil cropped with o. compressus. this greater activity was notorious when the legumes achieved greater phytomass development, thus highlighting the root？s stimulating effect on soil biological activity.
Soil classification of the Piauitinga river basin spring areas, Sergipe, Brazil
Leila Thais Soares Magalh？es,Jo？o Bosco Vasconcelos Gomes,Anderson Nascimento do Vasco,Antenor de Oliveira Aguiar Netto
Ambiente e água : An Interdisciplinary Journal of Applied Science , 2012,
Abstract: The study of regeneration and maintenance of spring areas is fundamentally important for the conservation of water resources. Considering the need for restoration of the surrounding areas of the springs of the sub-basin of the Piauitinga River, in Lagarto-Sergipe, this study aimed to characterize the soils in their local environment which will serve as a benchmark for future comparisons between areas of springs already degraded and in the recovering process. The springs were classified according to their origin and their stage of preservation. For the study of the local soil, reforested areas of each spring were selected and grouped according to their position in the landscape. The soil classification of the study sites was performed based on local landscape observation, description of opened micro-trenches and analyses of soil samples. The soils were described and classified morphologically. It was observed that from 22 analyzed spring areas, only two (9%) were considered according to their origin as diffuse and the remaining twenty (91%) as punctual. Considering the preservation stage five spring areas (22%) were identified as disturbed and the other ones as degraded (88%). The sites around the springs’ headwaters of the upper course of the Piauitinga river basin are located in erosion spots, depressions and a single case in the foothills coastal tablelands. The most striking characteristics of local soils are the strong hydromorphic (Gleissolos and gleic Cambisols) and, or, the low level of development (Cambisols and Plinthosols, both with much skeletal material, many of them in eroded phase).
STRUCTURAL REMEDIATION OF AN ALFISOL BY MEANS OF SEWAGE SLUDGE AMENDMENTS IN ASSOCIATION WITH YELLOW SERRADELA (Ornithopus compressus L.)
M.A Sandoval,J.E Celis,P Morales
Journal of Soil Science and Plant Nutrition , 2011,
Abstract: Wastewater treatment generates large amounts of sewage sludge, which when are disposed in highly degraded soils (with a complete loss of the A horizon and a great part of the B horizon), represent an interesting alternative to recover the aggregate level into soil. Within the hierarchy of soil systems, the aggregate level is the one that integrates soil properties that are directly related to soil sustainability. The aim of this study was to determine the effect of different dose of sewage sludge and an annual legume on the structural recovery of a degraded Alfisol. Sludge was added to soil at 0, 15, 30 and 60 t ha-1 in treatments with and without yellow serradela (Ornithopus compressus L.). After 6 months, the following structural indicators were identified: aggregate distribution, water aggregate stability and bulk density (Da). Results showed that the higher the sludge dose the higher the proportion of macroaggregates and their stability, whereas Da decreased. In spite of the short-term study, data showed that there was a positive effect when amendments were combined with O. compressus L. It demonstrated that degradation is likely to be reversed, thus giving to soil more physical support.
DIVERSIDAD DE HONGOS MICORRIZóGENOS ARBUSCULARES DE UNA CRONO-SECUENCIA DE SUELOS ALUVIALES DEGRADADOS POR ACTIVIDAD MINERA EN EL BAJO CAUCA ANTIOQUE？O, COLOMBIA
Medina Sierra,Marisol; Orozco Pati？o,Francisco Hernando; Márquez Fernández,María Elena;
Revista Facultad Nacional de Agronomía, Medellín , 2009,
Abstract: arbuscular mycorrhizal fungi (amf) presence and diversity were evaluated in undisturbed and disturbed soils form alluvial mining processes. the soils belong to the tropic fluvaquent, typic dystropept, and typic paleudult sub-groups which corresponded to low, middle and high terraces, respectively, of the cauca river at taraza town. amf propagules were multiplied in leonard jars under glasshouse conditions using sterile substrate, modified hoagland's solution and different fractions of soil used as sources of inoculum, which corresponded to the size of the spores. a first assay was made in maize (zea mays) which allowed mycorrhizal colonization in roots but not spore production. in a second assay, in kudzú (pueraria phaseoloides) amf spores and colonized roots were obtained with the treatments corresponding to propagules obtained from high terrace and disturbed soil. these treatments presented a significant effect on kudzu yield (p≤0,001) respect to the other treatments. the amf spores of undisturbed and disturbed soils showed low infective capacity. nevertheless, propagules of amf were multiplied in trap cultures, which produced spores of four morphotypes. one of these was identified as g. microagregatum. the polymorphism obtained by rapd's made possible the differentiation of these morphotypes with the primer opa2. similitude above 38% was achieved using upgma system. the results indicated that four morphotypes belong to the genus glomus, but they possibly belong to different species. our results are promissory in the differentiation of native strains of amf with low number of spores collected from soil samples in rehabilitation processes, which normally is unknown.
APLICACIóN DE LODOS DE PLANTA DE TRATAMIENTO DE CELULOSA: EFECTO EN ALGUNAS PROPIEDADES FíSICAS Y QUíMICAS DE SUELOS VOLCáNICOS
Aravena R,Claudia; Valentin C,Cristian; Diez J,M. Cristina; Mora G,M de la Luz; Gallardo A,Felipe;
Revista de la ciencia del suelo y nutrición vegetal , 2007, DOI: 10.4067/S0718-27912007000100001
Abstract: the sludge from cellulose treatment plant is rich in organic matter (mo) and can be used to improve the chemical and physical properties of the soil. the aim of this study was to evaluate the effect of the application of sludge from cellulose wastewater treatment plant on the physical and chemical properties of volcanic soils (series gorbea and collipulli). there was added sludge (0, 10, 20, 30 and 50 mg ha-1) to the soils and were incubated for 75 days at 22 ± 2oc. at 15 and 75 days the content of organic matter (mo), available nitrogen (n), ph, extractable al, field capacity, bulk density and aggregate stability was determinated. the application of sludge improved significantly (p ≤ 0.05) the levels of nitrogen and organic matter in both soils, as well as the ph, with the consistent decrease of al level. on the other hand, the different doses of sludge did not improve significantly the physical properties of the soils, with the exception of the stability of the aggregates in the soil series gorbea. the minor effect in the physical properties could happen due to the fact that the period of incubation (75 days) was not sufficient to provoke significant changes in the physical properties of the soils
Uncovering the Footprints of Erosion by On-Farm Maize Cultivation in a Hilly Tropical Landscape
Chaminda Egodawatta,Peter Stamp,Ravi Sangakkara
Agriculture , 2013, DOI: 10.3390/agriculture3030556
Abstract: A hilly region in Sri Lanka was considered to be degraded by erosion driven by intensive tobacco production, but what are reliable indicators of erosion? In addition to determining soil chemical and physical traits, maize was cropped with Nitrogen, Phosphorus and Potassium (NPK, PK) recommended mineral fertilization and without fertilizer (ZERO) in two major seasons(October–January in 2007/2008 and 2008/2009—Seasons 1 and 2 respectively) on 92 farms at inclinations ranging from 0% to 65%. In a subset of steep farms ( n = 21) an A horizon of 6 cm rather than of 26 cm was strong proof of erosion above 30% inclination. Below the A level, the thickness of the horizon was unaffected by inclination. Soil organic matter contents (SOM) were generally low, more so at higher inclinations, probably due to greater erosion than at lower inclination. Maize yields decreased gradually with increasing inclination; at ZERO, effects of climate and soil moisture on yield were easier determined and were probably due to long-term erosion. However, despite an initial set of 119 farms, an exact metric classification of erosion was impossible. NPK strongly boosted yield. This was a positive sign that the deficits in chemical soil fertility were overriding physical soil weaknesses. The study illustrated that chemical soil fertility in these soils is easily amenable to modifications by mineral and organic manures.
第1页/共1000条
每页显示 条


Home
Copyright © 2008-2020 Open Access Library. All rights reserved.