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711.
上海北部郊区土壤多环芳烃含量及来源分析 总被引:18,自引:4,他引:14
为研究上海北部郊区农田土壤的多环芳烃(PAHs)含量特征,野外采集表层土壤样品,通过室内分析方法测定了土壤中16种PAHs的含量.结果表明,在研究区土壤中16种优控PAHs总含量(w(PAH16))为203.8~6 753.9 ng/g, 平均值为1 172.7 ng/g. 相对于荷兰的土壤修复目标值而言,上海北部郊区部分地块农田表层土壤PAHs含量偏高.说明研究区农田土壤已经受到了一定程度的PAHs污染.根据不同环数PAHs的相对丰度法和PAHs组分的浓度比值法判断,上海北部郊区表层土壤中的PAHs主要来源于石油和煤等化石燃料的高温燃烧及汽车尾气排放等燃烧源. 相似文献
712.
Habitat loss and increasing landscape fragmentation are known to be key forces driving the ongoing loss of plant species diversity. While the combined effects of increasing isolation and decreasing population size have been studied intensively; it is less understood how plant population performance in heterogeneous landscapes is affected by changes in fragmentation alone. 相似文献
713.
Hannes Böttcher Annette Freibauer Michael Obersteiner Ernst-Detlef Schulze 《Ecological modelling》2008
Industrialized countries agreed on a reduction of greenhouse gas emissions under the Kyoto Protocol. Many countries elected forest management activities and the resulting net balance of carbon emissions and removals of non-CO2 greenhouse gases by forest management in their climate change mitigation measures. In this paper a generic dynamic forestry model (FORMICA) is presented. It has an empirical basis. Several modules trace C pools relevant for the Kyoto Protocol and beyond: biomass, litter, deadwood and soil, and harvested wood products. The model also accounts for the substitution of fossil fuels by wood products and bioenergy. 相似文献
714.
区域尾水控制初探--以昆山市为例 总被引:1,自引:0,他引:1
该文提出了“三级控制、三级标准”的区域水污染控制模式 ,分析了区域尾水控制的定位及意义。对区域尾水控制的三种主要方式做了较为详细的对比分析 ,并针对昆山市实际情况 ,初步构建了昆山市尾水导流方案。 相似文献
715.
王旭辉 《中国特种设备安全》2020,(2):32-36
本文通过综合比较现行安全技术规范、标准对叉车“安全保护与防护装置”的要求,分析叉车“安全保护与防护装置”的检验范围及内容,对其中争议较大项目的检验要求和方法提出建议. 相似文献
716.
本文调查了新疆某集中式饮用水不同水源类型总α、总β放射性水平,对不同的水源类型进行了数据对比,以为测量分析中出现的异常数据提供一个有效的鉴别依据。采集了新疆集中式饮用水不同类型水源经放化分析及测量总α、总β数值,得到新疆集中式饮用水不同水源类型放射性水平,并对不同类型的水源进行了对比分析。研究发现,总体上新疆某集中式饮用水不同水源类型的放射性水平基本处于正常环境本底范围,天然放射性核素水平未见异常;总α、总β的放射性浓度的高低是相依而存的,总α放射性浓度高的,其β的放射性浓度也高,总α放射性浓度低的,其β的放射性浓度也低;湖库型、河流型、地下水三种水源地的总α、总β的放射性浓度的高低的起因,主要包括其地理位置、水源类型等。 相似文献
717.
Bruno Takahashi Kanni Huang Frederick Fico David Poulson 《Environmental Communication: A Journal of Nature and Culture》2017,11(1):106-121
This study focuses on the use of science sources as experts in news stories about climate change coverage in the Great Lakes region of the US and Canada. We examine, using the hierarchy of influences model, whether the use of scientific sources in climate change coverage may be related to factors such as geographic location, reporting frequency, and authorship, in the prestige press as well as regional and local media. The study found that as many or more non-scientists than scientists are selected as sources regardless of geographic location, reporting frequency, or authorship. However, the study also found that the more stories reporters produce on this topic, the more likely their stories are to use and give prominence to science sources. In addition, the articles included few denier sources, but denier views are more likely to appear in a more prominent location in the articles than supporters when stories are framed as conflict over global warming. These results highlight the need for additional research examining the expertise of climate scientists in news stories to better understand news decision-making in the context of complex scientific reporting. 相似文献
718.
719.
Solid waste management (SWM) is at the forefront of environmental concerns in the Lower Rio Grande Valley (LRGV), South Texas.
The complexity in SWM drives area decision makers to look for innovative and forward-looking solutions to address various
waste management options. In decision analysis, it is not uncommon for decision makers to go by an option that may minimize
the maximum regret when some determinant factors are vague, ambiguous, or unclear. This article presents an innovative optimization
model using the grey mini-max regret (GMMR) integer programming algorithm to outline an optimal regional coordination of solid
waste routing and possible landfill/incinerator construction under an uncertain environment. The LRGV is an ideal location
to apply the GMMR model for SWM planning because of its constant urban expansion, dwindling landfill space, and insufficient
data availability signifying the planning uncertainty combined with vagueness in decision-making. The results give local decision
makers hedged sets of options that consider various forms of systematic and event-based uncertainty. By extending the dimension
of decision-making, this may lead to identifying a variety of beneficial solutions with efficient waste routing and facility
siting for the time frame of 2005 through 2010 in LRGV. The results show the ability of the GMMR model to open insightful
scenario planning that can handle situational and data-driven uncertainty in a way that was previously unavailable. Research
findings also indicate that the large capital investment of incineration facilities makes such an option less competitive
among municipal options for landfills. It is evident that the investment from a municipal standpoint is out of the question,
but possible public–private partnerships may alleviate this obstacle. 相似文献
720.
涪陵页岩气田一期工程环境影响调查 总被引:1,自引:0,他引:1
采用现场调研与实地监测相结合的方法对涪陵页岩气田一期工程污染源和区域环境质量现状进行深入调查研究,剖析涪陵页岩气开发对环境产生的影响。结果表明,涪陵页岩气田开发过程中废水实行循环利用,钻屑固体废物固化填埋,企业环保措施基本落实,短期内页岩气开发未对区域环境产生明显不良影响。指出修建井场、池体、道路等设施对生态环境具有一定影响,且随着时间推移,钻屑固化填埋对周围土壤及水环境也具有潜在影响。 相似文献