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141.
Sánchez-Arcilla Agustín Sierra Joan Pau Brown Sally Casas-Prat Mercè Nicholls Robert James Lionello Piero Conte Dario 《Regional Environmental Change》2016,16(8):2471-2484
Regional Environmental Change - The potential impact of climate change on port operations and infrastructures has received much less attention than the corresponding impact for beach systems.... 相似文献
142.
Agnes M. L. Karlson Jon Duberg Nisha H. Motwani Hedvig Hogfors Isabell Klawonn Helle Ploug Jennie Barthel Svedén Andrius Garbaras Brita Sundelin Susanna Hajdu Ulf Larsson Ragnar Elmgren Elena Gorokhova 《Ambio》2015,44(3):413-426
Filamentous, nitrogen-fixing cyanobacteria form extensive summer blooms in the Baltic Sea. Their ability to fix dissolved N2 allows cyanobacteria to circumvent the general summer nitrogen limitation, while also generating a supply of novel bioavailable nitrogen for the food web. However, the fate of the nitrogen fixed by cyanobacteria remains unresolved, as does its importance for secondary production in the Baltic Sea. Here, we synthesize recent experimental and field studies providing strong empirical evidence that cyanobacterial nitrogen is efficiently assimilated and transferred in Baltic food webs via two major pathways: directly by grazing on fresh or decaying cyanobacteria and indirectly through the uptake by other phytoplankton and microbes of bioavailable nitrogen exuded from cyanobacterial cells. This information is an essential step toward guiding nutrient management to minimize noxious blooms without overly reducing secondary production, and ultimately most probably fish production in the Baltic Sea. 相似文献
143.
A method to estimate the impact of clear-cutting on nutrient concentrations in boreal headwater streams 总被引:1,自引:0,他引:1
Large-scale forestry operations, like clear-cutting, may impair surface water quality if not done with environmental considerations in mind. Catchment and country level estimates of nutrient loads from forestry are generally based on specific export values, i.e., changes in annual exports due to the implemented forestry operations expressed in kg ha−1. We introduce here a specific concentration approach as a method to estimate the impact of clear-cutting on nutrient concentrations and export in headwater streams. This new method is potentially a more dynamic and flexible tool to estimate nutrient loads caused by forestry, because variation in annual runoff can be taken into account in load assessments. We combined water quality data from eight boreal headwater catchment pairs located in Finland and Sweden, where the effect of clear-cutting on stream water quality has been studied experimentally. Statistically significant specific concentration values could be produced for total nitrogen, nitrate, ammonium, and phosphate. The significant increases in the concentrations of these nutrients occurred between 2 and 6 years after clear-cutting. Significant specific concentration values could not be produced for total phosphorus and total organic carbon with the whole dataset, although in some single studies significant increases in their concentrations after clear-cutting were observed. The presented method enables taking into account variation in runoff, temporal dynamics of effects, and the proportional size of the treated area in load calculations. The number of existing studies considering large site-specific variation in responses to clear-cutting is small, and therefore further empirical studies are needed to improve predictive capabilities of the specific concentration values. 相似文献
144.
Mari Luz García-Lorenzo María José Martínez-Sánchez Carmen Pérez-Sirvent Joaquín López-Sánchez José Molina-Ruiz Mari Luz Tudela 《Environmental Forensics》2015,16(1):88-95
The objective of this study was to determine the As and Sb contents in soils from the Murcia Region of Spain and the possible relationship between the mineralogical composition, soil properties, and As and Sb concentrations. In this study, 490 samples were selected from areas with different characteristics in order to study As and Sb variability. Results show that As and Sb concentrations are positively correlated with the phyllosilicate and quartz content but negatively correlated with the calcite content. The generic reference level (GRL) for these elements was determined according to the Spanish legislation. Established GRL values vary according to the established mineralogical groups, suggesting that GRL has to be determined considering the lithological characteristics of the study area. 相似文献
145.
Bilgili Levent Çetinkaya Afşın Yusuf 《Journal of Material Cycles and Waste Management》2023,25(1):324-336
Journal of Material Cycles and Waste Management - In this study, an average waste composition was determined using the Provincial Environmental Status Reports of 81 provinces in Turkey for 2019,... 相似文献
146.
Cebeci Havva Hande Açıkalın Korkut Figen Aysel Kantürk 《Journal of Material Cycles and Waste Management》2023,25(4):2205-2221
Journal of Material Cycles and Waste Management - The current study aimed to determine the characteristics and kinetic parameters for the pyrolysis of printed circuit board (PCB) wastes including... 相似文献
147.
The residual pollution after the Aznalcóllar (southwestern Spain) pyrite mine spill is still a threat due to the continuing oxidation of sulfuric minerals. The objective of this paper was to analyze the combined effect of pyrite oxidation, sugar beet foam applications, and meteorological conditions on the spatiotemporal evolution of the pH and EDTA-extractable Zn concentration, using non co-located data from 11 sampling dates between June 1999 and March 2002. Median pH values ranged from 4.4 at the beginning of the monitoring period to 7.6 at the end, although values near 2.5 were observed throughout the entire period, despite of two sugar beet foam (SBF) applications. Zinc distributions were positively skewed and median concentrations ranged from 17 to 94 mg kg(-1). The inverse relationship between pH and Zn became weaker toward the end of the monitoring period as a consequence of the precipitation and posterior dissolution of newly formed minerals from the reaction products of the pyrite oxidation. Normal score maps showed that after the SBF applications only 0.5% of the monitored area was below the pH = 4 threshold, while on other dates up to one-third of the area remained below this value. The better performance of the second SBF application could be explained in terms of pyrite oxidation pathways and environmental conditions. From this analysis, with data obtained under uncontrolled field conditions, it is concluded that SBF should be applied before or during the wet and cold season to alleviate acidification, caused by the oxidation of pyrite or other sulfuric minerals. 相似文献
148.
Soil pollution with Cd is an environmental problem common in the world, and it is necessary to establish what Cd concentrations
in soil could be dangerous to its fertility from toxicity effects and the risk of transference of this element to plants and
other organisms of the food chain. In this study, we assessed Cd toxicity on soil microorganisms and plants in two semiarid
soils (uncultivated and cultivated). Soil ATP content, dehydrogenase activity, and plant growth were measured in the two soils
spiked with concentrations ranging from 3 to 8000 mg Cd/kg soil and incubated for 3 h, 20 days, and 60 days. The Cd concentrations
that produced 5%; 10%;, and 50%; inhibition of each of the two soil microbiological parameter studied (ecological dose, ED,
values) were calculated using two different mathematical models. Also, the effect of Cd concentration on plant growth of ryegrass
(Lolium perenne, L.) was studied in the two soils. The Cd ED values calculated for soil dehydrogenase activity and ATP content were higher
in the agricultural soils than in the bare soil. For ATP inhibition, higher ED values were calculated than for dehydrogenase
activity inhibition. The average yields of ryegrass were reduced from 5.03 to 3.56 g in abandoned soil and from 4.21 to 1.15
g in agricultural soil with increasing concentrations of Cd in the soil. Plant growth was totally inhibited in abandoned and
agricultural soils at Cd concentrations above 2000 and 5000 mg/kg soil, respectively. There was a positive correlation between
the concentration of Cd in the plants and the total or DTPA-extractable concentrations of Cd in the soil. 相似文献
149.
Hewitt Richard J. Pera Florencia A. Garca-Martn Mara Gaudry-Sada Karl-Heinz Hernndez-Jimnez Vernica Bieling Claudia 《Environmental management》2020,65(3):334-354
Environmental Management - Landscapes are changing, with rural areas becoming increasingly urbanized. Children and adolescents are underrepresented in the sense-of-place literature. Our study aimed... 相似文献
150.
Felton Adam Petersson Lisa Nilsson Oscar Witzell Johanna Cleary Michelle Felton Annika M. Björkman Christer Sang Åsa Ode Jonsell Mats Holmström Emma Nilsson Urban Rönnberg Jonas Kalén Christer Lindbladh Matts 《Ambio》2020,49(5):1035-1049
Ambio - The choice of tree species used in production forests matters for biodiversity and ecosystem services. In Sweden, damage to young production forests by large browsing herbivores is helping... 相似文献