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1.
The analysis of data of the ground-level ozone concentration and accumulated ozone exposure over a threshold of 40 ppb (AOT40)
in the rural areas of Lithuania is presented. Trends in the annual ozone mean, 95{th} and 25{th} percentiles were determined
as statistically not significant at Preila and Rugsteliskes sites during the 1994hbox{–}2004 period. Trends in the ozone concentration
and its percentiles in the air masses arriving to Preila station in “polluted” and “unpolluted” sectors have been examined.
Statistically significant changes in the ozone annual mean and 25th percentile were found in air masses in both “polluted”
and “unpolluted” sectors in the 1988hbox{–}2002 period. The trend analysis in the ozone monthly mean and percentiles for each
month of the year revealed the main changes in the ozone level in both sectors during January-May. Insignificant downward
trends in monthly 95th percentile in “unpolluted” sector and upward trends in “polluted” sector were found during summer months.
Values of AOT40 for the protection of forests as well as crops and semi-natural vegetation were determined during the 1994–2004
period. The estimated AOT40 values for the protection of forests were lower than the critical level at Lithuanian rural sites
but AOT40 values for the protection of crops and semi-natural vegetation were found to be higher than the critical level at
both sites. 相似文献
2.
This paper introduces a new portable intelligent electronic nose system developed especially for measuring and analysing livestock
and poultry farm odours. It can be used in both laboratory and field. The sensor array of the proposed electronic nose consists
of 14 gas sensors, a humidity sensor, and a temperature sensor. The gas sensors were especially selected for the main compounds
from the livestock farm odours. An expert system called “Odour Expert” was developed to support researchers’ and farmers’
decision making on odour control strategies for livestock and poultry operations. “Odour Expert” utilises several advanced
artificial intelligence technologies tailored to livestock and poultry farm odours. It can provide more advanced odour analysis
than existing commercially available products. In addition, a rank of odour generation factors is provided, which refines
the focus of odour control research. Field experiments were conducted downwind from the barns on 14 livestock and poultry
farms. Experimental results show that the predicted odour strengths by the electronic nose yield higher consistency in comparison
to the perceived odour intensity by human panel. The “Odour Expert” is a useful tool for assisting farmers’ odour management
practises.
Supported by Ontario Pork, Natural Sciences and Engineering Research Council (NSERC), and Ontario Ministry of Agriculture
and Food (OMAF) of Canada. 相似文献
3.
Driving Forces for the Marsh Wetland Degradation in the Honghe National Nature Reserve in Sanjiang Plain, Northeast China 总被引:7,自引:0,他引:7
Demin Zhou Huili Gong Yiyong Wang Shahbaz Khan Kuiyi Zhao 《Environmental Modeling and Assessment》2009,14(1):101-111
In the study, we analyze and assess quantitatively the spatial pattern of vegetation and its ecological degradation information
in the Honghe National Nature Reserve (HNNR), a Ramsar-designated site in Northeast China. Statistics from historical survey
data are used to measure the degradation of marshes over time and changes in the hydrological regime. Long-term statistical
data are also employed to analyze both natural and human impacts on these changes. Both the wetland degradation model and
its mechanisms are discussed in this paper. The research finds that the loss of water and other types of degradation in the
vegetation habitat caused by the rapid deterioration of the hydrological regime has threatened the status of HNNR as a “storage
area of natural genes.” Scientifically constructed strategies are urgently required to ensure sustainable economic benefits
that do not adversely affect this nature reserve. 相似文献
4.
Bioassays as well as biochemical responses (biomarkers) in ecosystems due to environmental stress provide us with signals (environmentally signalling) of potential damage in the environment. If these responses are perceived in this early stage in ecosystems, the eventual damage can be prevented. Once ecosystem damage has occurred, the remedial action processes for recovery could be expensive and pose certain logistical problems. Ideally, “early warning signals” in ecosystems using sensing systems of biochemical responses (biomarkers) would not only tell us the initial levels of damage, but these signals will also provide us with answers by the development of control strategies and precautionary measures in respect to the European Water Framework Directive (WFD). Clear technical guidelines or technical specifications on monitoring are necessary to establish and characterise reference conditions for use in an ecological status classification system for surface water bodies. For the Ecotoxicological Risk Assessment (ERA) of endocrine effects we used an approach of the exposure – dose – response concept. Based on the “Ecototoxicological Classification System of Sediments” that uses pT-values to classify effects in different river systems, we transferred the bio-monitoring data to the five-level ecological system of the WFD. To understand the complexity of the structure of populations and processes behind the health of populations, communities and ecosystems an ERA should establish links between natural factors, chemicals, and biological responses so as to assess causality. So, our ecological monitoring assessment has incorporated exposure & effects data. 相似文献
5.
Evaluation Score and Interpretation Index for the Ecological Quality of Running Waters in Central and Northern Hellas 总被引:3,自引:0,他引:3
The present study aims at creating an evaluation system for the quality of running waters, based on the analysis of benthic
macroinvertebrate records from Hellenic rivers (473 samples from 8 river basins). The proposed evaluation system (Hellenic
Evaluation Score and its Interpretation Index) may be used for waters sampled with the cost effective semi-quantitative sampling
method of “3 min kick-sweep” and requires benthic macroinvertebrates to be identified to the taxonomic level of family. Though
resulting from a modification of the Spanish score BMWP, it differs from it in the following characteristics: a) it includes
the relative abundance of benthic macroinvertebrates and b) it takes into consideration the habitat diversity of the studied
site, classifying it as “poor” or “rich”, based on some parameters of the System B of the Water Framework Directive (2000/60/EU).
Its interpretation is also based on a five-scaled classification system, consistent with the provisions of the same Directive. 相似文献
6.
Determination of landscape beauties through visual quality assessment method: a case study for Kemaliye (Erzincan/Turkey) 总被引:1,自引:0,他引:1
Kemaliye (Erzincan/Turkey) is the member of European Association of Historic Towns and Regions. The aim of this study was
to reveal the visual richness of the town; to identify the relationship between landscape spatial pattern and visual quality
of the landscape and to offer some suggestions for the future planning in regarding to these visual beauties. The visual quality
assessment method was used in this study. The results of the study revealed three landscape types that have the highest visual
quality. Among those, the highest one is urban scenery 3 (US3; VQP = 5.9400), the second is geological structure scenery 5
(GSS 5; VQP = 5.9200) and the third natural scenery 3 (NS3; VQP = 5.9133). Visual quality assessment showed that urban pattern,
geological structure and natural resources of the region also have visual value. The relationships between landscape spatial
pattern and visual quality of landscape indicated that certain characteristics of landscape affected the quality. For instance,
as the texture level decreased in natural landscapes and as the green areas increased in geological structure, visual preferences
ratio increased. Some suggestions were also made regarding the visual resources use in the region. 相似文献
7.
Green development is the fundamental way for high-quality development of marine economy. Achievement of green development goals of marine economy depends on the local government's decision-making preferences and reasonable marine-related environmental regulatory instruments. Based on 2007–2016 panel data of China's coastal provinces, this paper adopts the differential GMM(Gaussian Mixture Model) model to empirically analyze the impact of government preferences and environmental regulations on green development of marine economy. The results indicate that: lag exists in the promotion of environmental regulation on green development of marine economy.The impact of government preferences varies, in which, industrial preferences have a negative effect on green development of marine economy,while environmental preferences have a positive effect.The joint action of industrial preference and environmental preference inhibits green development of marine economy, while that of environmental preference and environmental regulation plays a promotion role. Different government preferences indicate different impacts in different regions. Environmental preference promotes the green development of marine economy in the Bohai Bay region, while industrial preference suppresses it. Both industrial preference and environmental preference in the Yangtze River Delta region have promotion effect, while only environmental preference in the Pan-Pearl River Delta region does so. Therefore, the government should establish a more complete official examination system, improve the marine environmental regulation system, and formulate differentiated green development policies for marine economy. 相似文献
8.
The concentrations of hexachlorocyclohexanes (HCHs) were investigated in urban soil samples collected from business area,
classical garden (CL), culture and educational area, large public green space (LA), residential area, and roadside area in
Beijing. HCH concentrations ranged from 0.32 to 136.43 ng/g, with a geometric mean of 3.46 ng/g. The HCH concentrations in
CL and LA were much higher than that in the other types of land use, which was due to the usage of HCHs to protect vegetation
in CL and LA. Source identification showed that contamination source of HCHs was derived from historical HCHs (including technical
HCHs and Lindane) as well as the long-range atmospheric transportation of HCHs. HCH concentrations showed a decreasing trend
from the city centre to the suburb, and it increased with the age of the urban area. HCHs were negatively correlated with
pH and positively correlated with total organic carbon and black carbon in soils. Health risk assessment with CalTOX and Monte
Carlo analysis showed that health risks mainly came from dermal uptake and inhalation exposure pathways, and the total risk
values were lower than the acceptable health risk value (10 − 6). The sensitivity analysis indicated that the reaction half-life of HCHs in soil, fraction dermal uptake from soil, exposure
duration, and organic carbon fraction in soil significantly contributed to the variance of the health risk. 相似文献
9.
Acadia National Park was one of the 14 sites included in the Park Research and Intensive Monitoring of Ecosystems network
(PRIMENet). For eight years the EPA monitored ultraviolet (UV) radiation at this site, with the National Park Service (NPS)
sponsoring a total climate and air monitoring station. Under the auspices of PRIMENet, research projects were initiated that
investigated the effects of UV on amphibians, determined watershed mass balances, and developed a model of deposition along
an elevational gradient. The monitoring data and research results have been used by park management to protect vegetation
and water resources from ozone and deposition. These data are now being used to develop a “vital signs” monitoring program
under the NPS’ Inventory and Monitoring Program. These data sets have been used in regional, national and international programs
to protect human health and resources from air pollution. Public outreach has been accomplished through web site resources
and via the Schoodic Education and Research Center. 相似文献
10.
Krupskaya LT Bubnova MB Zvereva VP Krupskiy AV 《Environmental monitoring and assessment》2012,184(5):2775-2781
The article considers the characteristics of mining–ecological monitoring of environmental objects changing under the influence
of toxic waste tailing dump (OAO “Solnechny GOK” Company). 相似文献