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71.
Richarde Marques da Silva Celso Augusto Guimarães Santos Valeriano Carneiro de Lima Silva Leonardo Pereira e Silva 《Environmental monitoring and assessment》2013,185(11):8977-8990
This study evaluates erosivity, surface runoff generation, and soil erosion rates for Mamuaba catchment, sub-catchment of Gramame River basin (Brazil) by using the ArcView Soil and Water Assessment Tool (AvSWAT) model. Calibration and validation of the model was performed on monthly basis, and it could simulate surface runoff and soil erosion to a good level of accuracy. Daily rainfall data between 1969 and 1989 from six rain gauges were used, and the monthly rainfall erosivity of each station was computed for all the studied years. In order to evaluate the calibration and validation of the model, monthly runoff data between January 1978 and April 1982 from one runoff gauge were used as well. The estimated soil loss rates were also realistic when compared to what can be observed in the field and to results from previous studies around of catchment. The long-term average soil loss was estimated at 9.4 t ha?1 year?1; most of the area of the catchment (60 %) was predicted to suffer from a low- to moderate-erosion risk (<6 t ha?1 year?1) and, in 20 % of the catchment, the soil erosion was estimated to exceed >?12 t ha?1 year?1. Expectedly, estimated soil loss was significantly correlated with measured rainfall and simulated surface runoff. Based on the estimated soil loss rates, the catchment was divided into four priority categories (low, moderate, high and very high) for conservation intervention. The study demonstrates that the AvSWAT model provides a useful tool for soil erosion assessment from catchments and facilitates the planning for a sustainable land management in northeastern Brazil. 相似文献
72.
Luiz Fernando Mendes Cassius Vinicius Stevani Leonardo Zambotti-Villela Nair Sumie Yokoya Pio Colepicolo 《Environmental science and pollution research international》2014,21(13):8216-8223
The macroalga Gracilaria domingensis is an important resource for the food, pharmaceutical, cosmetic, and biotechnology industries. G. domingensis is at a part of the food web foundation, providing nutrients and microelements to upper levels. As seaweed storage metals in the vacuoles, they are considered the main vectors to magnify these toxic elements. This work describes the evaluation of the toxicity of binary mixtures of available metal cations based on the growth rates of G. domingensis over a 48-h exposure. The interactive effects of each binary mixture were determined using a toxic unit (TU) concept that was the sum of the relative contribution of each toxicant and calculated using the ratio between the toxicant concentration and its endpoint. Mixtures of Cd(II)/Cu(II) and Zn(II)/Ca(II) demonstrated to be additive; Cu(II)/Zn(II), Cu(II)/Mg(II), Cu(II)/Ca(II), Zn(II)/Mg(II), and Ca(II)/Mg(II) mixtures were synergistic, and all interactions studied with Cd(II) were antagonistic. Hypotheses that explain the toxicity of binary mixtures at the molecular level are also suggested. These results represent the first effort to characterize the combined effect of available metal cations, based on the TU concept on seaweed in a total controlled medium. The results presented here are invaluable to the understanding of seaweed metal cation toxicity in the marine environment, the mechanism of toxicity action and how the tolerance of the organism. 相似文献
73.
Characterization of Atrazine-Loaded Biodegradable Poly(Hydroxybutyrate-Co-Hydroxyvalerate) Microspheres 总被引:2,自引:0,他引:2
Renato Grillo Nathalie F. S. de Melo Renata de Lima Roberto Wagner Lourenço André Henrique Rosa Leonardo Fernandes Fraceto 《Journal of Polymers and the Environment》2010,18(1):26-32
Polyhydroxybutyrate-co-hydroxyvalerate microspheres (PHBV-MS) were prepared as a delivery system for the herbicide atrazine
(ATZ). Characterization of the system included investigation of in vitro release properties and genotoxicity. ATZ − PHBV-MS
particle diameters showed a size distribution range of 1–13 μm. Differential scanning calorimetry analyses indicated that
ATZ was associated with the PHBV microparticles. The release profiles showed a different release behavior for the pure herbicide
in solution, as compared with that containing ATZ-loaded PHBV-MS. Korsmeyer–Peppas model analyses showed that atrazine release
from the microparticles occurred by a combination of diffusion through the matrix and partial diffusion through water-filled
pores of the PHBV microparticles. A Lactuca sativa test result showed that the genotoxicity of ATZ-loaded PHBV-MP was decreased in relation to ATZ alone. The results demonstrate
a viable biodegradable herbicide release system using atrazine for agrochemical purposes. 相似文献
74.
75.
Cleber Broietti Leonardo Flach Suliani Rover João Antônio Salvador de Souza 《国际发展与全球生态学杂志》2018,25(7):630-641
Environmental expenditure can be classified as an indicator to measure the efforts of public agents with the environment. Cities and countries seek to understand the determinants of environmental spending over time. This research aims to analyze the variables that influence the environmental spending of Brazilian municipalities between the years 2012 and 2016. Thus, this research helps fill the gap on lack of longitudinal research that involves local contexts in relation to public municipal expenditures on the environment. The research method consists of the panel data model. Data were collected on the environmental expenditures of the municipalities and other variables of 4269 Brazilian municipalities, the collection generated 21,329 observations. The results showed that the municipalities of the state of Amapá had better relative expenditure averages, it was also observed that the municipalities in the Northeast region show the worst results. The municipality of Itamaracá, located in the state of Pernambuco, presented the best percentage of the country, 9.47% of the environmental expenditure in relation to total expenditure. Regarding the results of panel data, the variables revenue, population, density, GDP, and HDI presented significance in all models; the models estimated by fixed effects ensure the consistency of the parameters. 相似文献
76.
Torresan Filippo Piccinini Leonardo Cacace Mauro Pola Marco Zampieri Dario Fabbri Paolo 《Environmental geochemistry and health》2022,44(7):2135-2162
Environmental Geochemistry and Health - Renewable natural resources are strategic for reducing greenhouse gas emissions and the human footprint. The renewability of these resources is a crucial... 相似文献
77.
Nascimento Leonardo Kuramochi Takeshi Höhne Niklas 《Mitigation and Adaptation Strategies for Global Change》2022,27(6):1-19
Mitigation and Adaptation Strategies for Global Change - Climate adaptation is seen by many as increasingly important and as deeply political, leading some to argue for its democratization. Social... 相似文献
78.
79.
Boyero L Pearson RG Dudgeon D Graça MA Gessner MO Albariño RJ Ferreira V Yule CM Boulton AJ Arunachalam M Callisto M Chauvet E Ramírez A Chará J Moretti MS Gonçalves JF Helson JE Chará-Serna AM Encalada AC Davies JN Lamothe S Cornejo A Li AO Buria LM Villanueva VD Zúñiga MC Pringle CM 《Ecology》2011,92(9):1839-1848
Most hypotheses explaining the general gradient of higher diversity toward the equator are implicit or explicit about greater species packing in the tropics. However, global patterns of diversity within guilds, including trophic guilds (i.e., groups of organisms that use similar food resources), are poorly known. We explored global diversity patterns of a key trophic guild in stream ecosystems, the detritivore shredders. This was motivated by the fundamental ecological role of shredders as decomposers of leaf litter and by some records pointing to low shredder diversity and abundance in the tropics, which contrasts with diversity patterns of most major taxa for which broad-scale latitudinal patterns haven been examined. Given this evidence, we hypothesized that shredders are more abundant and diverse in temperate than in tropical streams, and that this pattern is related to the higher temperatures and lower availability of high-quality leaf litter in the tropics. Our comprehensive global survey (129 stream sites from 14 regions on six continents) corroborated the expected latitudinal pattern and showed that shredder distribution (abundance, diversity and assemblage composition) was explained by a combination of factors, including water temperature (some taxa were restricted to cool waters) and biogeography (some taxa were more diverse in particular biogeographic realms). In contrast to our hypothesis, shredder diversity was unrelated to leaf toughness, but it was inversely related to litter diversity. Our findings markedly contrast with global trends of diversity for most taxa, and with the general rule of higher consumer diversity at higher levels of resource diversity. Moreover, they highlight the emerging role of temperature in understanding global patterns of diversity, which is of great relevance in the face of projected global warming. 相似文献
80.
Leonardo Marotta Luigi Ceccaroni Gabriele Matteucci Paolo Rossini Stefano Guerzoni 《Journal of Coastal Conservation》2011,15(3):393-405
This paper describes a decision-support system based on landscape ecology and focused on the study of ecosystems’ health.
System capabilities are illustrated with three cases of integrated coastal zone management (ICZM), in the Adriatic Sea (Italy):
the lagoon of Venice and the Rimini and Ancona coastal areas. Indicators and indices are developed with a focus on sub-regional
and local problems in coastal management, with a multi-scale approach based on landscape and seascape ecology. Land-use changes
of the coastal areas were detected by analyzing two sets of satellite images. Indices combining satellite imagery, socio-economic
and environmental indicators, and landscape and seascape maps were created, showing ecological changes, habitat loss and gaps
in conservation policy. The approach used provides means for the identification of conflicts and for the assessment of sustainability.
Results show that the lagoon of Venice plays an important role in mitigating and compensating the impacts of human activities,
and needs to be protected and restored. The Rimini area shows high ecological footprint and development-intensity and low
biocapacity. The Ancona area needs the protection of its natural coastal space from potential sources of anthropogenic impacts
to maintain its sustainability. A model of environment changes is critical for formulating effective environmental policies
and management strategies. The developed decision-support system provides a suitability map per each area analyzed, which
can be used in order to maximize different policy objectives and reduce coastal conflicts. 相似文献