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https://www.readbyqxmd.com/read/28813695/risk-based-remediation-of-polluted-sites-a-critical-perspective
#1
REVIEW
Saranya Kuppusamy, Kadiyala Venkateswarlu, Mallavarapu Megharaj, Srinithi Mayilswami, Yong Bok Lee
Sites contaminated with chemical pollutants represent a growing challenge, and remediation of such lands is of international concern. Risk-based land management (RBLM) is an emerging approach that integrates risk assessment practices with more traditional site-specific investigations and remediation activities. Developing countries are yet to adopt RBLM strategies for remediation. RBLM is considered to be practical, scientifically defensible and cost-efficient. However, it is inherently limited by: firstly, the accuracy of risk assessment models used; secondly, ramifications of the fact that they are more likely to leave contamination in place; and thirdly, uncertainties involved and having to consider the total concentrations of all contaminants in soils that overestimate the potential risks from exposure to the contaminants...
August 9, 2017: Chemosphere
https://www.readbyqxmd.com/read/28813532/nitrogen-and-carbon-isotopic-dynamics-of-subarctic-soils-and-plants-in-southern-yukon-territory-and-its-implications-for-paleoecological-and-paleodietary-studies
#2
Farnoush Tahmasebi, Fred J Longstaffe, Grant Zazula, Bruce Bennett
We examine here the carbon and nitrogen isotopic compositions of bulk soils (8 topsoil and 7 subsoils, including two soil profiles) and five different plant parts of 79 C3 plants from two main functional groups: herbs and shrubs/subshrubs, from 18 different locations in grasslands of southern Yukon Territory, Canada (eastern shoreline of Kluane Lake and Whitehorse area). The Kluane Lake region in particular has been identified previously as an analogue for Late Pleistocene eastern Beringia. All topsoils have higher average total nitrogen δ15N and organic carbon δ13C than plants from the same sites with a positive shift occurring with depth in two soil profiles analyzed...
2017: PloS One
https://www.readbyqxmd.com/read/28813440/invasive-australian-acacia-seed-banks-size-and-relationship-with-stem-diameter-in-the-presence-of-gall-forming-biological-control-agents
#3
Matthys Strydom, Ruan Veldtman, Mzabalazo Z Ngwenya, Karen J Esler
Australian Acacia are invasive in many parts of the world. Despite significant mechanical and biological efforts to control their invasion and spread, soil-stored seed banks prevent their effective and sustained removal. In response South Africa has had a strong focus on employing seed reducing biological control agents to deal with Australian Acacia invasion, a programme that is considered as being successful. To provide a predictive understanding for their management, seed banks of four invasive Australian acacia species (Acacia longifolia, A...
2017: PloS One
https://www.readbyqxmd.com/read/28813428/soil-features-in-rookeries-of-antarctic-penguins-reveal-sea-to-land-biotransport-of-chemical-pollutants
#4
Anna C Santamans, Rafael Boluda, Antonio Picazo, Carlos Gil, Joaquín Ramos-Miras, Pablo Tejedo, Luis R Pertierra, Javier Benayas, Antonio Camacho
The main soil physical-chemical features, the concentrations of a set of pollutants, and the soil microbiota linked to penguin rookeries have been studied in 10 selected sites located at the South Shetland Islands and the Antarctic Peninsula (Maritime Antarctica). This study aims to test the hypothesis that biotransport by penguins increases the concentration of pollutants, especially heavy metals, in Antarctic soils, and alters its microbiota. Our results show that penguins do transport certain chemical elements and thus cause accumulation in land areas through their excreta...
2017: PloS One
https://www.readbyqxmd.com/read/28813155/research-on-controllable-degradation-of-novel-sulfonylurea-herbicides-in-acidic-and-alkaline-soils
#5
Shaa Zhou, Xue-Wen Hua, Wei Wei, Yu-Cheng Gu, Xiaoqing Liu, Jinghuo Chen, Minggui Chen, Yong-Tao Xie, Sha Zhou, Xiang-De Meng, Yan Zhang, Yong-Hong Li, Baolei Wang, Haibin Song, Zheng-Ming Li
The degradation issue of sulfonylurea (SU) has become one of the biggest challenges that hamper the development and application of this class of herbicides, especially in alkaline soils of Northern China. On the basis of previous discovery that some substituents on the 5th position of the benzene ring in Chlorsulfuron could hasten its degradation rate apparently in acidic soil, this work on Metsulfuron-methyl showed more convincing results. Two novel compounds (I-1 and I-2) were designed and synthesized, at the same time, they still retained potent herbicidal activity against both tested dicotyledon and monocotyledon...
August 16, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28813099/leaf-area-estimation-of-cassava-from-linear-dimensions
#6
Samara Zanetti, Laís F M Pereira, Maria Márcia P Sartori, Marcelo A Silva
The objective of this study was to determine predictor models of leaf area of ​​cassava from linear leaf measurements. The experiment was carried out in greenhouse in the municipality of Botucatu, São Paulo state, Brazil. The stem cuttings with 5-7 nodes of the cultivar IAC 576-70 were planted in boxes filled with about 320 liters of soil, keeping soil moisture at field capacity, monitored by puncturing tensiometers. At 80 days after planting, 140 leaves were randomly collected from the top, middle third and base of cassava plants...
August 14, 2017: Anais da Academia Brasileira de Ciências
https://www.readbyqxmd.com/read/28813097/avian-communities-in-the-amazonian-cangas-vegetation-biogeographic-affinities-components-of-beta-diversity-and-conservation
#7
Sérgio H Borges, Marcos P D Santos, Leonardo M S Soares, Antonita S DA Silva
The Amazonian cangas is a vegetation type distributed as patches of open vegetation embedded in a matrix of tropical forest and that grows over iron-rich soils in the Serra dos Carajás region. To characterize cangas avifauna, we surveyed birds in eight patches varying from 43 to 1,366 hectares. Cangas avifauna has compositional affinities with savannas widespread throughout the Amazon and other biomes, and we estimate that more than 200 bird species occurs in this habitat. Species composition was relatively homogeneous, and the similarity among cangas patches was the dominant component of the beta-diversity...
August 14, 2017: Anais da Academia Brasileira de Ciências
https://www.readbyqxmd.com/read/28812698/urbanization-erodes-ectomycorrhizal-fungal-diversity-and-may-cause-microbial-communities-to-converge
#8
Dietrich J Epp Schmidt, Richard Pouyat, Katalin Szlavecz, Heikki Setälä, D Johan Kotze, Ian Yesilonis, Sarel Cilliers, Erzsébet Hornung, Miklós Dombos, Stephanie A Yarwood
Urbanization alters the physicochemical environment, introduces non-native species and causes ecosystem characteristics to converge. It has been speculated that these alterations contribute to loss of regional and global biodiversity, but so far most urban studies have assessed macro-organisms and reported mixed evidence for biodiversity loss. We studied five cities on three continents to assess the global convergence of urban soil microbial communities. We determined the extent to which communities of bacteria, archaea and fungi are geographically distributed, and to what extent urbanization acts as a filter on species diversity...
April 10, 2017: Nature ecology & evolution
https://www.readbyqxmd.com/read/28812687/community-structure-follows-simple-assembly-rules-in-microbial-microcosms
#9
Jonathan Friedman, Logan M Higgins, Jeff Gore
Microorganisms typically form diverse communities of interacting species, whose activities have tremendous impact on the plants, animals and humans they associate with. The ability to predict the structure of these complex communities is crucial to understanding and managing them. Here, we propose a simple, qualitative assembly rule that predicts community structure from the outcomes of competitions between small sets of species, and experimentally assess its predictive power using synthetic microbial communities composed of up to eight soil bacterial species...
March 27, 2017: Nature ecology & evolution
https://www.readbyqxmd.com/read/28812666/unknown-risks-to-soil-biodiversity-from-commercial-fungal-inoculants
#10
Miranda M Hart, Pedro M Antunes, Lynette K Abbott
No abstract text is available yet for this article.
March 23, 2017: Nature ecology & evolution
https://www.readbyqxmd.com/read/28812652/parasites-dominate-hyperdiverse-soil-protist-communities-in-neotropical-rainforests
#11
Frédéric Mahé, Colomban de Vargas, David Bass, Lucas Czech, Alexandros Stamatakis, Enrique Lara, David Singer, Jordan Mayor, John Bunge, Sarah Sernaker, Tobias Siemensmeyer, Isabelle Trautmann, Sarah Romac, Cédric Berney, Alexey Kozlov, Edward A D Mitchell, Christophe V W Seppey, Elianne Egge, Guillaume Lentendu, Rainer Wirth, Gabriel Trueba, Micah Dunthorn
High animal and plant richness in tropical rainforest communities has long intrigued naturalists. It is unknown if similar hyperdiversity patterns are reflected at the microbial scale with unicellular eukaryotes (protists). Here we show, using environmental metabarcoding of soil samples and a phylogeny-aware cleaning step, that protist communities in Neotropical rainforests are hyperdiverse and dominated by the parasitic Apicomplexa, which infect arthropods and other animals. These host-specific parasites potentially contribute to the high animal diversity in the forests by reducing population growth in a density-dependent manner...
March 20, 2017: Nature ecology & evolution
https://www.readbyqxmd.com/read/28812635/divergent-plant-soil-feedbacks-could-alter-future-elevation-ranges-and-ecosystem-dynamics
#12
Michael E Van Nuland, Joseph K Bailey, Jennifer A Schweitzer
Plant-soil feedbacks (PSF) are important interactions that may influence range dynamics in a changing world. What remains largely unknown is the generality of plant-soil biotic interactions across populations and the potential role of specific soil biota, both of which are key for understanding how PSF might change future communities and ecosystems. We combined landscape-level field observations and experimental soil treatments to test whether a dominant tree alters soil environments to impact its own performance and range shifts towards higher elevations...
April 28, 2017: Nature ecology & evolution
https://www.readbyqxmd.com/read/28812604/stand-age-and-species-richness-dampen-interannual-variation-of-ecosystem-level-photosynthetic-capacity
#13
Talie Musavi, Mirco Migliavacca, Markus Reichstein, Jens Kattge, Christian Wirth, T Andrew Black, Ivan Janssens, Alexander Knohl, Denis Loustau, Olivier Roupsard, Andrej Varlagin, Serge Rambal, Alessandro Cescatti, Damiano Gianelle, Hiroaki Kondo, Rijan Tamrakar, Miguel D Mahecha
The total uptake of carbon dioxide by ecosystems via photosynthesis (gross primary productivity, GPP) is the largest flux in the global carbon cycle. A key ecosystem functional property determining GPP is the photosynthetic capacity at light saturation (GPPsat), and its interannual variability (IAV) is propagated to the net land-atmosphere exchange of CO2. Given the importance of understanding the IAV in CO2 fluxes for improving the predictability of the global carbon cycle, we have tested a range of alternative hypotheses to identify potential drivers of the magnitude of IAV in GPPsat in forest ecosystems...
January 23, 2017: Nature ecology & evolution
https://www.readbyqxmd.com/read/28812040/effect-of-changes-in-artificial-turf-on-sports-injuries-in-male-university-soccer-players
#14
Kohei Fujitaka, Akira Taniguchi, Tsukasa Kumai, Shingo Otuki, Mamoru Okubo, Yasuhito Tanaka
BACKGROUND: Studies comparing the types and severity of trauma and injuries caused by different types of field surfaces have been conducted. However, there have been no studies on sports injuries caused by temporal deterioration of long-pile artificial turf fields and related decreases in the rubber chip and silica sand infill. PURPOSE: To investigate the influence of an artificial turf field on sports injuries in a university soccer team. STUDY DESIGN: Descriptive epidemiological study...
August 2017: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/28811758/pathological-interrelations-of-soil-borne-diseases-in-cucurbits-caused-by-fusarium-species-and-meloidogyne-incognita
#15
Yunhee Seo, Young Ho Kim
Pathological interrelations of two soil-borne diseases in cucurbits (watermelon, oriental melon, shintosa and cucumber) caused by Fusarium isolates (FI) and the root-knot nematode (RKN), Meloidogyne incognita were characterized by the fusarium disease severity index (DI), RKN gall index (GI) and eggmass index (EI) in inoculation tests using FI and RKN. Virulence of FI as determined by DI at 4 weeks after inoculation was mostly in the higher order of Fusarium proliferatum F6, F5 and Fusarium oxysporum f. sp...
August 2017: Plant Pathology Journal
https://www.readbyqxmd.com/read/28811756/pseudomonas-oleovorans-strain-kbpf-004-culture-supernatants-reduced-seed-transmission-of-cucumber-green-mottle-mosaic-virus-and-pepper-mild-mottle-virus-and-remodeled-aggregation-of-126-kda-and-subcellular-localization-of-movement-protein-of-pepper-mild-mottle
#16
Nam-Gyu Kim, Eun-Young Seo, Sang-Hyuk Han, Jun-Su Gong, Cheol-Nam Park, Ho-Seop Park, Leslie L Domier, John Hammond, Hyoun-Sub Lim
Efforts to control viral diseases in crop production include several types of physical or chemical treatments; antiviral extracts of a number of plants have also been examined to inhibit plant viral infection. However, treatments utilizing naturally selected microorganisms with activity against plant viruses are poorly documented. Here we report isolation of a soil inhabiting bacterium, Pseudomonas oleovorans strain KBPF-004 (developmental code KNF2016) which showed antiviral activity against mechanical transmission of tobamoviruses...
August 2017: Plant Pathology Journal
https://www.readbyqxmd.com/read/28811557/separating-vegetation-greening-and-climate-change-controls-on-evapotranspiration-trend-over-the-loess-plateau
#17
Zhao Jin, Wei Liang, Yuting Yang, Weibin Zhang, Jianwu Yan, Xuejuan Chen, Sha Li, Xingguo Mo
Evapotranspiration (ET) is a key ecological process connecting the soil-vegetation-atmosphere system, and its changes seriously affects the regional distribution of available water resources, especially in the arid and semiarid regions. With the Grain-for-Green project implemented in the Loess Plateau (LP) since 1999, water and heat distribution across the region have experienced great changes. Here, we investigate the changes and associated driving forces of ET in the LP from 2000 to 2012 using a remote sensing-based evapotranspiration model...
August 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28811535/delimiting-species-of-protaphorura-collembola-onychiuridae-integrative-evidence-based-on-morphology-dna-sequences-and-geography
#18
Xin Sun, Feng Zhang, Yinhuan Ding, Thomas W Davies, Yu Li, Donghui Wu
Species delimitation remains a significant challenge when the diagnostic morphological characters are limited. Integrative taxonomy was applied to the genus Protaphorura (Collembola: Onychiuridae), which is one of most difficult soil animals to distinguish taxonomically. Three delimitation approaches (morphology, molecular markers and geography) were applied providing rigorous species validation criteria with an acceptably low error rate. Multiple molecular approaches, including distance- and evolutionary model-based methods, were used to determine species boundaries based on 144 standard barcode sequences...
August 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28811512/projected-climate-change-impacts-in-rainfall-erosivity-over-brazil
#19
André Almagro, Paulo Tarso S Oliveira, Mark A Nearing, Stefan Hagemann
The impacts of climate change on soil erosion may bring serious economic, social and environmental problems. However, few studies have investigated these impacts on continental scales. Here we assessed the influence of climate change on rainfall erosivity across Brazil. We used observed rainfall data and downscaled climate model output based on Hadley Center Global Environment Model version 2 (HadGEM2-ES) and Model for Interdisciplinary Research On Climate version 5 (MIROC5), forced by Representative Concentration Pathway 4...
August 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28811510/temporal-changes-in-the-radiocesium-distribution-in-forests-over-the-five-years-after-the-fukushima-daiichi-nuclear-power-plant-accident
#20
Naohiro Imamura, Masabumi Komatsu, Shinta Ohashi, Shoji Hashimoto, Takuya Kajimoto, Shinji Kaneko, Tsutomu Takano
To elucidate the temporal changes in the radiocesium distribution in forests contaminated by the Fukushima Daiichi Nuclear Power Plant accident, we monitored the (137)Cs concentration and inventory within forests from 2011 to 2015 across nine plots containing variable tree species and different contamination levels. The (137)Cs concentrations in needles and branches decreased exponentially at all coniferous plots, with effective ecological half-lives of 0.45-1.55 yr for needles and 0.83-1.69 yr for branches...
August 15, 2017: Scientific Reports
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