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https://www.readbyqxmd.com/read/28740177/physical-access-for-residue-mineral-interactions-controls-organic-carbon-retention-in-an-oxisol-soil
#1
Chenglong Ye, Tongshuo Bai, Yi Yang, Hao Zhang, Hui Guo, Zhen Li, Huixin Li, Shuijin Hu
Oxisol soils are widely distributed in the humid tropical and subtropical regions and are generally characterized with high contents of metal oxides. High metal oxides are believed to facilitate organic carbon (C) accumulation via mineral-organic C interactions but Oxisols often have low organic C. Yet, the causes that constrain organic C accumulation in Oxisol soil are not exactly clear. Here we report results from a microcosm experiment that evaluated how the quantity and size of crop residue fragments affect soil C retention in a typical Oxisol soil in southeast China...
July 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28721625/key-indicator-tools-for-shallow-slope-failure-assessment-using-soil-chemical-property-signatures-and-soil-colour-variables
#2
Rashidi Othman, Shah Irani Hasni, Zainul Mukrim Baharuddin, Khairusy Syakirin Has-Yun Hashim, Lukman Hakim Mahamod
Slope failure has become a major concern in Malaysia due to the rapid development and urbanisation in the country. It poses severe threats to any highway construction industry, residential areas, natural resources and tourism activities. The extent of damages that resulted from this catastrophe can be lessened if a long-term early warning system to predict landslide prone areas is implemented. Thus, this study aims to characterise the relationship between Oxisols properties and soil colour variables to be manipulated as key indicators to forecast shallow slope failure...
July 18, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28709039/agricultural-management-of-an-oxisol-affects-accumulation-of-heavy-metals
#3
Guilherme Deomedesse Minari, David Luciano Rosalen, Mara Cristina Pessôa da Cruz, Wanderley José de Melo, Lucia Maria Carareto Alves, Luciana Maria Saran
Soil contamination may result from the inadequate disposal of substances with polluting potential or prolonged agricultural use. Therefore, cadmium (Cd), chromium (Cr) and nickel (Ni) concentrations were assessed in a Eutroferric Red Oxisol under a no-tillage farming system with mineral fertilizer applications, a conventional tillage system with mineral fertilizer application and a conventional tillage system with sewage sludge application in an area used for agriculture for more than 80 years. We evaluated the spatial distributions of these elements in the experimental area and the effect of the different management practices on the soil retention of these metals...
October 2017: Chemosphere
https://www.readbyqxmd.com/read/28611747/microbial-community-and-functional-structure-significantly-varied-among-distinct-types-of-paddy-soils-but-responded-differently-along-gradients-of-soil-depth-layers
#4
Ren Bai, Jun-Tao Wang, Ye Deng, Ji-Zheng He, Kai Feng, Li-Mei Zhang
Paddy rice fields occupy broad agricultural area in China and cover diverse soil types. Microbial community in paddy soils is of great interest since many microorganisms are involved in soil functional processes. In the present study, Illumina Mi-Seq sequencing and functional gene array (GeoChip 4.2) techniques were combined to investigate soil microbial communities and functional gene patterns across the three soil types including an Inceptisol (Binhai), an Oxisol (Leizhou), and an Ultisol (Taoyuan) along four profile depths (up to 70 cm in depth) in mesocosm incubation columns...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28482309/why-does-carbon-increase-in-highly-weathered-soil-under-no-till-upon-lime-and-gypsum-use
#5
Thiago Massao Inagaki, João Carlos de Moraes Sá, Eduardo Fávero Caires, Daniel Ruiz Potma Gonçalves
Field experiments have been used to explain how soil organic carbon (SOC) dynamics is affected by lime and gypsum applications, however, how SOC storage occurs is still debatable. We hypothesized that although many studies conclude that Ca-based soil amendments such as lime and gypsum may lead to SOC depletion due to the enhancement of microbial activity, the same does not occur under conservation agriculture conditions. Thus, the objective of this study was to elucidate the effects of lime and gypsum applications on soil microbial activity and SOC stocks in a no-till field and in a laboratory incubation study simulating no-till conditions...
December 1, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28399193/high-genetic-diversity-among-and-within-bitter-manioc-varieties-cultivated-in-different-soil-types-in-central-amazonia
#6
Alessandro Alves-Pereira, Nivaldo Peroni, Marcelo Mattos Cavallari, Maristerra R Lemes, Maria Imaculada Zucchi, Charles R Clement
Although manioc is well adapted to nutrient-poor Oxisols of Amazonia, ethnobotanical observations show that bitter manioc is also frequently cultivated in the highly fertile soils of the floodplains and Amazonian dark earths (ADE) along the middle Madeira River. Because different sets of varieties are grown in each soil type, and there are agronomic similarities between ADE and floodplain varieties, it was hypothesized that varieties grown in ADE and floodplain were more closely related to each other than either is to varieties grown in Oxisols...
April 2017: Genetics and Molecular Biology
https://www.readbyqxmd.com/read/28371707/evaluation-of-ferrolysis-in-arsenate-adsorption-on-the-paddy-soil-derived-from-an-oxisol
#7
Jun Jiang, Zhaoxia Dai, Rui Sun, Zhenjie Zhao, Ying Dong, Zhineng Hong, Renkou Xu
Iron oxides are dominant effective adsorbents for arsenate in iron oxide-rich variable charge soils. Oxisol-derived paddy soils undergo intensive ferrolysis, which results in high leaching and transformation of iron oxides. However, little information is available concerning the effect of ferrolysis on arsenate adsorption by paddy soil and parent Oxisol. In the present study, we examined the arsenate affinity of soils using arsenate adsorption/desorption isotherms, zeta potential, adsorption kinetics, pH effect and phosphate competition experiments...
July 2017: Chemosphere
https://www.readbyqxmd.com/read/27959897/impact-of-amendments-on-the-physical-properties-of-soil-under-tropical-long-term-no-till-conditions
#8
Antonio C A Carmeis Filho, Carlos A C Crusciol, Tiara M Guimarães, Juliano C Calonego, Sacha J Mooney
Tropical regions have been considered the world's primary agricultural frontier; however, some physico-chemical deficiencies, such as low soil organic matter content, poor soil structure, high erodibility, soil acidity, and aluminum toxicity, have affected their productive capacity. Lime and gypsum are commonly used to improve soil chemical fertility, but no information exists about the long-term effects of these products on the physical attributes and C protection mechanisms of highly weathered Oxisols. A field trial was conducted in a sandy clay loam (kaolinitic, thermic Typic Haplorthox) under a no-tillage system for 12 years...
2016: PloS One
https://www.readbyqxmd.com/read/27695752/biochar-properties-influencing-greenhouse-gas-emissions-in-tropical-soils-differing-in-texture-and-mineralogy
#9
Somchai Butnan, Jonathan L Deenik, Banyong Toomsan, Michael J Antal, Patma Vityakon
The ability of biochar applications to alter greenhouse gases (GHGs) (CO, CH, and NO) has been attracting research interest. However, inconsistent published results necessitate further exploration of potential influencing factors, including biochar properties, biochar rates, soil textures and mineralogy, and their interactions. Two short-term laboratory incubations were conducted to evaluate the effects of different biochars: a biochar with low ash (2.4%) and high-volatile matter (VM) (35.8%) contents produced under low-temperature (350°C) traditional kiln and a biochar with high ash (3...
September 2016: Journal of Environmental Quality
https://www.readbyqxmd.com/read/27508374/estimation-of-the-degree-of-soil-p-saturation-from-brazilian-mehlich-1-p-data-and-field-investigations-on-p-losses-from-agricultural-sites-in-minas-gerais
#10
P Fischer, R Pöthig, B Gücker, M Venohr
The degree of phosphorus saturation (DPS) of agricultural soils is studied worldwide for risk assessment of phosphorus (P) losses. In previous studies, DPS could be reliably estimated from water-soluble P (WSP) for European and Brazilian soils. In the present study, we correlated measured WSP and Mehlich-1 P (M1P) from soils of Minas Gerais (MG) and Pernambuco (PE) (R(2) = 0.94, n = 59) to create a DPS map from monitoring data. The resulting DPS map showed high spatial variability and low values of DPS (54 ± 22%, mean and standard deviation; n = 1,827)...
2016: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/27300567/assessment-of-carbon-storage-under-rainforests-in-humic-hapludox-along-a-climosequence-extending-from-the-atlantic-coast-to-the-highlands-of-northeastern-brazil
#11
Jane Kelly Silva Araujo, Valdomiro Severino de Souza Júnior, Flávio Adriano Marques, Paul Voroney, Regilene Angelica da Silva Souza
An understanding of the stock of soil organic carbon (SOC) in the umbric epipedon of Oxisols located in the tropical forests surrounded by a semi-arid region is limited but essential because of their importance in the global cycle of carbon (C). The purpose of this study was to assess the effects of climatic (temperature and rainfall), soil organic matter (SOM) composition and litter on the stability of C in surfaces and subsurfaces in five Humic Oxisols along a 475-km climosequence from 143 to 963ma.s.l. in a tropical environment in northeastern Brazil...
October 15, 2016: Science of the Total Environment
https://www.readbyqxmd.com/read/27178288/ecotoxicological-impact-of-arsenic-on-earthworms-and-collembolans-as-affected-by-attributes-of-a-highly-weathered-tropical-soil
#12
Paulo Roger Lopes Alves, Evandro Barbosa da Silva, Elke Jurandy Bran Nogueira Cardoso, Luís Reynaldo Ferracciú Alleoni
High levels of heavy metals in soils may impose serious impacts on terrestrial organisms. In Brazil, the prevention values for evaluating the ecological risk of these elements are based only on soil chemical analyses and/or on data from ecotoxicological assays performed in soils of temperate regions. However, the attributes of the Brazilian highly-weathered tropical soils can influence the availability of heavy metals for soil fauna, resulting in different toxic values. To provide more accurate ecotoxicological risk values for arsenic (As) in tropical soils, we assessed the impacts of sodium arsenate (Na2HAsO4·7H2O) on the reproduction of earthworms (Eisenia andrei) and collembolans (Folsomia candida), as well as on As bioaccumulation and growth (weight loss) of E...
May 13, 2016: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/27111424/ecotoxicological-effects-of-pig-manure-on-folsomia-candida-in-subtropical-brazilian-soils
#13
Ana Paula Maccari, Dilmar Baretta, Diovani Paiano, Sara Leston, Andreia Freitas, Fernando Ramos, Jose Paulo Sousa, Osmar Klauberg-Filho
The effects of pig manure, from diets incorporating veterinary pharmaceuticals, on survival and reproduction of Folsomia candida were evaluated. Manures derived from the following diets: corn and soymeal (CS); 85% CS diet+15% wheat meal (TR); CS diet+100ppm doxycycline+50ppm colistin+2500ppm Zn oxide (CSa); TR diet+100ppm doxycycline+50ppm colistin+2500ppm Zn oxide (TRa). Manures were tested in two subtropical soils representative of southern (Oxisol and Entisol). Despite the antibiotics no significant differences were found between the four manures within each soil...
August 15, 2016: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/27063014/effects-of-different-fertilizers-on-the-abundance-and-community-structure-of-ammonia-oxidizers-in-a-yellow-clay-soil
#14
Huaiying Yao, Sha Huang, Qiongfen Qiu, Yaying Li, Lianghuan Wu, Wenhai Mi, Feng Dai
Yellow clay paddy soil (Oxisols) is a typical soil with low productivity in southern China. Nitrification inhibitors and slow release fertilizers have been used to improve nitrogen fertilizer utilization and reduce environmental impaction of the paddy soil. However, their effects on ammonia-oxidizing archaea (AOA) and ammonia-oxidizing bacteria (AOB) in paddy soil have rarely been investigated. In the present work, we compared the influences of several slow release fertilizers and nitrification inhibitors on the community structure and activities of the ammonia oxidizers in yellow clay soil...
August 2016: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/26996909/adsorption-of-cd-ii-by-two-variable-charge-soils-in-the-presence-of-pectin
#15
Ru-Hai Wang, Xiao-Fang Zhu, Wei Qian, Min-Hua Zhao, Ren-Kou Xu, Yuan-Chun Yu
Batch experiments were conducted to investigate cadmium(II) (Cd(II)) adsorption by two variable-charge soils (an Oxisol and an Ultisol) as influenced by the presence of pectin. When pectin dosage was less than 30 g kg(-1), the increase in Cd(II) adsorption with the increasing dose of pectin was greater than that when the pectin dosage was >30 g kg(-1). Although both Langmuir and Freundlich equations fitted the adsorption isotherms of Cd(II) and electrostatic adsorption data of Cd(II) by the two soils well, the Langmuir equation showed a better fit...
July 2016: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/26797944/hydrogeochemistry-of-arsenic-pollution-in-watersheds-influenced-by-gold-mining-activities-in-paracatu-minas-gerais-state-brazil
#16
Edison Bidone, Zuleica Castilhos, Ricardo Cesar, Maria Carla Santos, Ricardo Sierpe, Marcos Ferreira
The aim of this study is to evaluate total arsenic (As) concentrations in drinking water (main pathway of human exposure) and its hydrogeochemical controls in the "Morro do Ouro" gold mine region, which is the largest gold mine in Brazil, characterized by gold-arsenopyrite association. Arsenic concentration was generally below the detection limit (LOD < 0.5 μg L(-1)). Thus, water ingestion may not be a significant exposure pathway to local population. Low groundwater As concentrations (<1 μg L(-1)) are likely due to ore body structural setting, which plunges from 10° to >20°, being readily covered by thick phyllites that are poor in As some hundreds of meters away from the mine...
May 2016: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/26697719/effect-of-soil-water-content-on-the-distribution-of-diuron-into-organomineral-aggregates-of-highly-weathered-tropical-soils
#17
Jussara B Regitano, Wadson S D Rocha, Eloana J Bonfleur, Debora Milori, Luís R F Alleoni
We evaluated the effects of soil water content on the retention of diuron and its residual distribution into organomineral aggregates in four Brazilian oxisols. (14)C-Diuron was incubated for days at 25, 50, and 75% of maximum water-holding capacity for each soil. After 42 days, the physical fractionation method was used to obtain >150, 53-150, 20-53, 2-20, and <2 μm aggregate sizes. Diuron retention increased with increasing soil water content for all soils. At lower soil water content, diuron's retention was higher in the sandier soil...
May 25, 2016: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/26628229/growth-of-tropical-tree-species-and-absorption-of-copper-in-soil-artificially-contaminated
#18
R F Silva, R Andreazza, C Da Ros, A Dellai, R J S Jacques, D Scheid
Reclamation of copper contaminated sites using forest species may be an efficient alternative to reduce the negative impact. The aim of this study was to quantify the growth and evaluate the quality of seedlings of native species at different doses of copper in the soil. The experimental design was completely randomized, with seven replications in a factorial arrangement (3×9), using three indigenous species of plants (Anadenanthera macrocarpa, Mimosa scabrella and Apuleia leiocarpa) and nine doses of copper in the soil (0, 60, 120, 180, 240, 300, 360, 420 and 480 mg kg-1)...
November 2015: Brazilian Journal of Biology, Revista Brasleira de Biologia
https://www.readbyqxmd.com/read/26351200/legacy-phosphorus-and-no-tillage-agriculture-in-tropical-oxisols-of-the-brazilian-savanna
#19
Marcos Rodrigues, Paulo Sergio Pavinato, Paul John Anthony Withers, Ana Paula Bettoni Teles, Wilfrand Ferney Bejarano Herrera
Crop production in the Brazilian Cerrado is limited by soil phosphorus (P) supply without large inputs of inorganic P fertilizer, which may become more costly and scarce in the future. Reducing dependency on fertilizer P requires a greater understanding of soil P supply in the highly weathered soils in this important agricultural region. We investigated the impact of no tillage (NT) and conventional tillage (CT) agriculture on accumulated (legacy) soil P and P forms in four long-term sites. Compared to the native savanna soils, tilled soils receiving regular annual P fertilizer inputs (30-50 kg P ha(-1)) increased all forms of inorganic and organic P, except highly recalcitrant P associated with the background lithology...
January 15, 2016: Science of the Total Environment
https://www.readbyqxmd.com/read/26342934/phosphorus-migration-analysis-using-synchrotron-radiation-in-soil-treated-with-brazilian-granular-fertilizers
#20
Robson C de Castro, Vinícius de Melo Benites, Paulo César Teixeira, Marcelino José dos Anjos, Luis Fernando de Oliveira
The aim of this study was to evaluate the phosphorus (P) mobility in a tropical Brazilian soil type red Oxisol treated with three different forms of granular fertilizer. Total Reflection X-Ray Fluorescence (TXRF) was applied to determine the concentration of P at different distances from granular fertilizer application point. The results showed that most of the P from fertilizers tends to concentrate in a region of up to 10mm around the place of the fertilizer deposition.
November 2015: Applied Radiation and Isotopes
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