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排序方式: 共有97条查询结果,搜索用时 15 毫秒
91.
Chiara Telloli Antonella Malaguti Mihaela Mirce Renzo Tassinari Carmela Vaccaro Massimo Berico 《环境科学学报(英文版)》2014,26(9):1903-1912
This study shows for the first time a chemical and morphological characterization of agricultural aerosols released during three important agricultural operations: threshing, plowing and sowing. The field campaigns were carried out in the eastern part of the Po Valley, Italy, in summer and autumn 2009. The aerosol particles were sampled on quartz fiber filters and polytetrafluoroethylene membranes in order to allow Inductively Coupled Plasma Mass Spectrometry (ICP-MS) analysis and Scanning Electron Microscopy equipped with an Energy Dispersive X-ray Spectrometer (SEM-EDS) investigations, respectively. The organic carbon mass concentrations were measured with a Sunset Laboratory Dual-Optical Organic Carbone/Elemental Carbon (OCEC) Aerosol analyzer. The morphological and chemical analyses by SEM-EDS allowed recognizing four main particle classes: organic, silica, calcite and clay minerals. The organic particles contribute to both fine and coarse aerosol fractions up to ca. 50% for all three agricultural activities. This was also confirmed by OCEC analysis for fine fraction. Most of the agricultural aerosols, about 60%, were single particles and the remaining 40% were agglomerations of particles. The ICP-MS results showed that threshing and plowing produce more aerosol particles than sowing, which was characterized by important amounts of clay minerals produced from land soils. 相似文献
92.
Over the past two decades, communication on environmental values, actions and performance has become an essential activity of organisations, because of the increased public concern and legislation related to the environment. Stakeholders put pressure on companies to take environmental responsibility. In this framework, an effective environmental communication can generate value-added on companies' environmental work, and consequently, their competitiveness and profitability can benefit from communicating their environmental responsibility. In 2006, the International Organization for Standardization (ISO) launched a standard for environmental communication, ISO 14063. ISO 14063 should not be used for third-party certification purposes. Instead, it is intended to be used as a guideline and support companies to ensure successful environmental communication. The aim of this paper is to prompt a discussion about the applicability of the standard ISO 14063 not only to single organisations but as a tool to plan the environmental communication strategy of a whole territorial area. This is achieved by performing a case study relating to the Interreg IVC-funded project “Progresland”. The project involved three Italian and one Spanish natural areas and demonstrated that ISO 14063 could be a valid support to define and implement an environmental communication plan for a territorial area. 相似文献
93.
The complexity of nectar: secretion and resorption dynamically regulate nectar features 总被引:2,自引:0,他引:2
In this paper, we review the phenomenon of nectar resorption, focusing on its physiological and ecological meaning. Nectar
resorption is a phenomenon that has long been known but was rarely reported until the1990s. It has more recently been demonstrated
in several species by various direct and indirect methodologies. It has generally been demonstrated in senescent flowers as
a phenomenon separate in time from, and independent of, nectar secretion. The significance of this type of resorption is generally
recognized as a resource-recovery strategy, recycling at least some materials invested in nectar production. Nevertheless,
nectar resorption can occur concomitantly with nectar secretion. Nectar production is therefore best considered as a unified
process comprising nectar secretion and resorption. The modulation of these two opposite phases allows nectar concentration
to be maintained in a range suitable for pollinators (nectar homeostasis). The mechanism of nectar resorption at the cell
level has received little attention, and its molecular basis can only be hypothesized on the basis of recent studies concerning
sugar sensing. 相似文献
94.
Mercury levels in sediments of central Mediterranean Sea: a 150+ year record from box-cores recovered in the Strait of Sicily 总被引:1,自引:0,他引:1
To evaluate the degree of anthropogenic mercury pollution, Hg contents have been measured for box-core sediments sampled along three nearshore–offshore transects in the Strait of Sicily and well constrained for their mineralogy, bulk geochemistry and TOC%. Hg values are generally low (from 15 to 70 μg kg−1); however, depth profiles clearly display upcore rising concentrations (up to 202 μg kg−1 near the SE Sicily coast) that are attributed to anthropogenic load. Based on 210Pb chronology, these trends are more dramatic across the last 20–30 years. Geogenic influence is thought to explain some anomalies related to volcanic emission and geothermal activity. Combined effects due to eastward flowing of the Modified Atlantic Water (MAW) and sea bottom morphology drove major anthropogenic accumulation. 相似文献
95.
Northern Latium (Italy) is an area where the Rn risk rate is potentially high because of the extensive outcropping of Neogene
U-rich volcanics and the presence of major active tectonic lineaments. The lack of data on Rn risk rates in that area, which
is undergoing major urban and industrial development, has prompted this study. It proposes a methodology to evaluate the maximum
potential diffusive Rn flux from soils based on the measurement of 226Ra, 232Th and 40K activities by γ-ray spectrometry, and the measurement of main soil parameters influencing the Rn emanation. This methodology
provides a simple, reliable and low-cost tool for drawing up radon flux maps useful to both public planners and private individuals,
who want to operate safely in the study area. The proposed methodology may also be applied to other geographic areas outside
the prescribed study area. 相似文献
96.
Tribaudino Mario Solzi Massimo Mantovani Luciana Zaccara Patrizia Groppi Elisa 《Environmental science and pollution research international》2022,29(42):63171-63181
Environmental Science and Pollution Research - Environmental monitoring in Northern Italy, one of the most polluted areas in Europe, is of paramount importance. Leaf monitoring throughout magnetic... 相似文献
97.
Environmental Economics and Policy Studies - Voluntary approaches to environmental policy can contribute to stemming environmental degradation in developing countries with weak institutions. We... 相似文献