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https://www.readbyqxmd.com/read/29761238/cadmium-sorption-and-extractability-in-tropical-soils-with-variable-charge
#1
Marina Colzato, Luís Reynaldo Ferracciú Alleoni, Marcos Yassuo Kamogawa
The availability of cadmium (Cd) for plants and its impact in the environment depends on Cd sorption in soil colloids. The study of Cd sorption in soil and its fractionation is an interesting tool for the evaluation of Cd affinity with soil pools. The objective with this study was to evaluate Cd sorption and desorption in tropical soils with variable charge (three Oxisols), in a Mollisol and in two Entisols with diverse physical, chemical, and mineralogical attributes. We used a thermodynamic approach to evaluate Cd sorption and performed a chemical fractionation of Cd in the six soils...
May 14, 2018: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/29734589/population-and-community-structure-shifts-of-ammonia-oxidizers-after-four-year-successive-biochar-application-to-agricultural-acidic-and-alkaline-soils
#2
Lili He, Yucui Bi, Jin Zhao, Cameron M Pittelkow, Xu Zhao, Shenqiang Wang, Guangxi Xing
Long-term studies that advance our mechanistic understanding of biochar (BC)‑nitrogen (N) interactions in agricultural soils are lacking. In this study, soil potential nitrification rates (PNR), the abundance and composition of ammonia-oxidizing archaea (AOA) and ammonia-oxidizing bacteria (AOB) communities following 4-year of BC application were investigated using the shaken-slurry procedure and molecular sequencing techniques for an acidic Oxisol (QU) and an alkaline Cambisol (YU). Soils were obtained from an outdoor soil column experiment with straw-BC application rates of 0 (BC0), 2...
April 1, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29727960/occurrence-and-removal-of-pharmaceutical-compounds-and-steroids-at-four-wastewater-treatment-plants-in-hawai-i-and-their-environmental-fate
#3
Matteo D'Alessio, Sathaporn Onanong, Daniel D Snow, Chittaranjan Ray
The occurrence of pharmaceutical and steroid compounds in groundwater due to wastewater reuse has been reported and is of concern in tropical islands which primarily rely on groundwater. The objective of this study was to investigate the occurrence and removal of 43 pharmaceutical and steroid compounds detected in wastewater at four different wastewater treatment plants (WWTPs) in Hawai'i and to understand their environmental behavior through tropical soils as the treated effluents are used in landscapes for irrigation...
August 1, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29723915/causes-of-reduced-leaf-level-photosynthesis-during-strong-el-ni%C3%A3-o-drought-in-a-central-amazon-forest
#4
Victor Alexandre Hardt Ferreira Dos Santos, Marciel José Ferreira, João Victor Figueiredo Cardoso Rodrigues, Maquelle Neves Garcia, João Vitor Barbosa Ceron, Bruce Walker Nelson, Scott Reid Saleska
Sustained drought and concomitant high temperature may reduce photosynthesis and cause tree mortality. Possible causes of reduced photosynthesis include stomatal closure and biochemical inhibition, but their relative roles are unknown in Amazon trees during strong drought events. We assessed the effects of the recent (2015) strong El Niño drought on leaf-level photosynthesis of Central Amazon trees via these two mechanisms. Through four seasons of 2015, we measured leaf gas exchange, chlorophyll a fluorescence parameters, chlorophyll concentration and nutrient content in leaves of 57 upper canopy and understory trees of a lowland terra firme forest on well-drained infertile oxisol...
May 3, 2018: Global Change Biology
https://www.readbyqxmd.com/read/29660881/differences-in-transport-behavior-of-natural-soil-colloids-of-contrasting-sizes-from-nanometer-to-micron-and-the-environmental-implications
#5
Fei Liu, Baile Xu, Yan He, Philip C Brookes, Caixian Tang, Jianming Xu
Transport behaviors of nanoparticles (<100nm) and clay fractions (clay particles, <2μm; coarse clay particles, 1-2μm and fine clay particles, 0.1-1μm) extracted from two natural soils (Inceptisol from Jilin and Oxisol from Hainan, China) were investigated in saturated sand columns at 1-30mM NaCl and pH5-9. Increasing NaCl concentrations decreased the mobility, while increasing pH increased the mobility of soil particles of various sizes. At pH5 and 30mM NaCl, nanoparticles and clay fractions exhibited the different transport behaviors, and ripening was observed for Inceptisol nanoparticles while blocking for Oxisol nanoparticles in breakthrough curves (BTCs)...
April 11, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29554769/phosphorus-saturation-and-superficial-fertilizer-application-as-key-parameters-to-assess-the-risk-of-diffuse-phosphorus-losses-from-agricultural-soils-in-brazil
#6
P Fischer, R Pöthig, B Gücker, M Venohr
In Brazil, a steady increase in phosphorus (P) fertilizer application and agricultural intensification has been reported for recent decades. The concomitant P accumulation in soils potentially threatens surface water bodies with eutrophication through diffuse P losses. Here, we demonstrated the applicability of a soil type-independent approach for estimating the degree of P saturation (DPS; a risk parameter of P loss) by a standard method of water-soluble phosphorus (WSP) for two major soil types (Oxisols, Entisols) of the São Francisco catchment in Brazil...
March 5, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29526265/soil-forensics-how-far-can-soil-clay-analysis-distinguish-between-soil-vestiges
#7
R S Corrêa, V F Melo, G G F Abreu, M H Sousa, J A Chaker, J A Gomes
Soil traces are useful as forensic evidences because they frequently adhere to individuals and objects associated with crimes and can place or discard a suspect at/from a crime scene. Soil is a mixture of organic and inorganic components and among them soil clay contains signatures that make it reliable as forensic evidence. In this study, we hypothesized that soils can be forensically distinguished through the analysis of their clay fraction alone, and that samples of the same soil type can be consistently distinguished according to the distance they were collected from each other...
March 2018: Science & Justice: Journal of the Forensic Science Society
https://www.readbyqxmd.com/read/29372330/pre-incubation-in-soil-improves-the-nitrogen-fertiliser-value-of-hair-waste
#8
N M Malepfane, P Muchaonyerwa
Global generation of human hair waste and its disposal at landfills could contribute to the leaching of nitrates into ground water. High concentrations of nitrogen (N) and other elements suggest that the waste could be a source of plant nutrients and differences in ethnic hair types could affect nutrient release and fertiliser value. The objective of this study was to determine the effects of hair type, as an N source, and pre-incubation time on dry-matter yield, nutrient uptake by spinach (Spinacia oleracea L...
January 25, 2018: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/29363035/incorporation-of-corn-straw-biochar-inhibited-the-re-acidification-of-four-acidic-soils-derived-from-different-parent-materials
#9
Ren-Yong Shi, Jiu-Yu Li, Jun Jiang, Muhammad Aqeel Kamran, Ren-Kou Xu, Wei Qian
The effect of corn straw biochar on inhibiting the re-acidification of acid soils derived from different parent materials due to increased soil pH buffering capacity (pHBC) was investigated using indoor incubation and simulated acidification experiments. The incorporation of the biochar increased the pHBC of all four soils due to the increase in soil cation exchange capacity (CEC). When 5% biochar was incorporated, the pHBC was increased by 62, 27, 32, and 24% for the Ultisols derived from Tertiary red sandstone, Quaternary red earth, granite, and the Oxisol derived from basalt, respectively...
April 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29223900/driving-factors-of-soil-carbon-accumulation-in-oxisols-in-long-term-no-till-systems-of-south-brazil
#10
Ademir de Oliveira Ferreira, Telmo Jorge Carneiro Amado, Charles W Rice, Dorivar A Ruiz Diaz, Clever Briedis, Thiago Massao Inagaki, Daniel Ruiz Potma Gonçalves
In a climate change scenario, it is important to understand the factors that lead to changes in a soil carbon (C) sink. It is recognized that such process is highly dependent on climate, soil properties, topography, and vegetation. However, few studies demonstrate how these mechanisms operate in highly weathered Oxisols. Therefore, this study evaluated the driving factors for C recovery and accumulation and its relations with fertility attributes in the soil profile (0 to 1m depth) in no-till (NT) croplands of south Brazil...
May 1, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29216516/atr-ftir-investigation-of-mechanisms-of-bacillus-subtilis-adhesion-onto-variable-and-constant-charge-soil-colloids
#11
Li-Ying Ren, Zhi-Neng Hong, Zhao-Dong Liu, Ren-Kou Xu
The primary objective of this study was to determine the capacity and the mechanisms of adhesion of Bacillus subtilis onto variable- and constant-charge soil colloids. The adhesion process was investigated using in situ attenuated total reflectance (ATR)-Fourier transform infrared spectroscopy (FTIR), zeta potential, and batch adhesion experiments. The maximum adhesion capacity of B. subtilis on the colloids of Oxisol, Ultisol, and Alfisol reached 699.17, 462.56, and 258.82mgg-1 , respectively. B. subtilis adhesion to all three soil colloids decreased as the suspension pH increased from 3 to 8...
February 1, 2018: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29122351/macroaggregation-and-soil-organic-carbon-restoration-in-a-highly-weathered-brazilian-oxisol-after-two-decades-under-no-till
#12
Ademir de Oliveira Ferreira, João Carlos de Moraes Sá, Rattan Lal, Florent Tivet, Clever Briedis, Thiago Massao Inagaki, Daniel Ruiz Potma Gonçalves, Jucimare Romaniw
Conclusions based on studies of the impacts of soil organic carbon (SOC) fractions and soil texture on macroaggregation and SOC stabilization in long-term (>20years) no-till (NT) fields remain debatable. This study was based on the hypothesis that the amount and frequency of biomass-C input associated with NT can be a pathway to formation of macroaggregates and to SOC buildup. The objectives were to: 1) assess the macroaggregate distribution (proportional mass, class mass) and the SOC and particulate organic carbon (POC) stocks of extra-large (8-19mm), large (2-8mm) and small (0...
April 15, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29100125/ion-leaching-and-soil-solution-acidification-in-a-vadose-zone-under-soil-treated-with-sewage-sludge-for-agriculture
#13
Ricardo Perobelli Borba, Victor Sanches Ribeirinho, Otávio Antonio de Camargo, Cristiano Alberto de Andrade, Carmen Silvia Kira, Aline Reneé Coscione
In this study, we performed monitoring of the soil solution (SS) over 10 years on a loamy/clayey-textured Dark Red Dystroferric Oxisol that received sewage sludge for agricultural purposes. The SS was obtained by lysimeters installed along the walls of a well at 1 m, 2 m, 3 m, 4 m and 5 m in depth. The major ions found in the SS were NO3 - , SO4 2- , Cl- , Ca2+ , Mg2+ , Al3+ , Pb2+ , Cd2+ and Zn2+ , and the pH level ranged from 4 to 6.5 along the profile. Throughout the first three years of monitoring, the pH to a 3-m depth became more acidic, and in the last year, this trend reached 5 m...
February 2018: Chemosphere
https://www.readbyqxmd.com/read/29066202/phosphorous-fractions-in-soils-of-rubber-based-agroforestry-systems-influence-of-season-management-and-stand-age
#14
Chenggang Liu, Yanqiang Jin, Changan Liu, Jianwei Tang, Qingwei Wang, Mingxi Xu
Rubber-based agroforestry system is a vital management practice and its productivity is often controlled by soil phosphorus (P) nutrient, but little information is available on P fractions dynamics in such system. The aim of this study was to examine the seasonal, management and stand age effects on P fractions, acid phosphatase activity, microbial biomass P, other physical-chemical properties and litter and roots in four systems: 10-year-old rubber mono- (YM) and intercropping (YI) with N-fixing species (NFS), 22-year-old mono- (MM) and intercropping (MI) in Xishuangbanna, Southwestern China...
March 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29048038/fluorescence-lifetime-evaluation-of-whole-soils-from-the-amazon-rainforest
#15
Gustavo Nicolodelli, Amanda Maria Tadini, Marcelo Saito Nogueira, Sebastião Pratavieira, Stephane Mounier, Jose Luis Clabel Huaman, Cléber Hilário Dos Santos, Célia Regina Montes, Débora Marcondes Bastos Pereira Milori
Time-resolved fluorescence spectroscopy (TRFS) is a new tool that can be used to investigate processes of interaction between metal ions and organic matter (OM) in soils, providing a specific analysis of the structure and dynamics of macromolecules. To the best of our knowledge, there are no studies in the literature reporting the use of this technique applied to whole/non-fractionated soil samples, making it a potential method for use in future studies. This work describes the use of TRFS to evaluate the fluorescence lifetimes of OM of whole soils from the Amazon region...
August 20, 2017: Applied Optics
https://www.readbyqxmd.com/read/28898750/assessment-of-the-effectiveness-of-onsite-exsitu-remediation-by-enhanced-natural-attenuation-in-the-niger-delta-region-nigeria
#16
Reuben N Okparanma, Ikeabiama Azuazu, Josiah M Ayotamuno
This study was conducted to quantify and rank the effectiveness of onsite exsitu remediation by enhanced natural attenuation using soil quality index. The investigation was conducted at three oil spill sites in the Niger Delta (5.317°N, 6.467°E), Nigeria with a predominance of Oxisols. Baseline assessment and a two-step post-remediation monitoring of the sites were conducted. Target contaminants including total petroleum hydrocarbon (TPH) and BTEX (benzene, toluene, ethylbenzene, and xylene) were analyzed by gas chromatography-mass spectrometry...
December 15, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28740177/physical-access-for-residue-mineral-interactions-controls-organic-carbon-retention-in-an-oxisol-soil
#17
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
#18
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...
October 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28709039/agricultural-management-of-an-oxisol-affects-accumulation-of-heavy-metals
#19
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
#20
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
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