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41.
企业环境监测工作的现状及发展初探 总被引:1,自引:0,他引:1
剖析了企业环境监测工作的现状,明确了企业环境监测工作的工基本立足点,在面临大中型国有企业主业副业剥离的情况下,对企业环境监测机构在市场经济条件下如何面对自己的生存进行了探讨,并提出企业环境监测工作的发展设想。 相似文献
42.
锦州地区地下水饮用水源污染因素及防治对策研究 总被引:1,自引:0,他引:1
通过对锦州地区地下水饮用水源水质监测数据分析,评价地下水饮用水源水质现状;针对部分水源水质超标现象,分析其成因,并在实地考察的基础上从工矿企业污染源、生活污染源、养殖业污染源、农业污染源和不合理开采等几方面进一步阐述水源地潜在污染因素;在此基础上从预防、治理、生态修复及加强监管等方面提出地下水饮用水源污染防治对策。 相似文献
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Veronika Bókony László Zsolt Garamszegi Katharina Hirschenhauser András Liker 《Behavioral ecology and sociobiology》2008,62(8):1229-1238
Despite the functional significance of melanin-based plumage coloration in social and sexual signaling, the mechanisms controlling
its information content are poorly understood. The T-regulation hypothesis proposes that melanin ornaments signal competitive
abilities via the effects of testosterone (T) mediating both melanization and sexual/aggressive behaviors. Using the phylogenetic
comparative approach, we tested whether frontal black melanization is associated with elevated T around the time of breeding
plumage development across all bird species with available T-data. We found a context-dependent relationship between melanization
and T, varying with the type of ornamentation (patchy or full-black) and with the presumed taxonomic distribution of the hormonal
control of plumage dichromatism. Within two taxa in which male plumage development is assumed androgen-dependent (Charadriiformes,
Corvida), evolutionary increases in male melanization, and melanin dichromatism correlated with increases in T in most analyses
but not within the basal lineage (ratites, Galloanseriformes) with androgen-independent male plumage. Among Passeroidea with
presumably genetically or luteinizing-hormone-based male plumage, melanization and its dichromatism correlated with T only
in species with <100% frontal melanization. These results were robust as we controlled for several confounding variables such
as mating and parental behaviors. This study is the first to test and support the T-regulation hypothesis interspecifically,
suggesting that among-species differences in melanization may have evolved in response to differences in circulating T in
certain avian taxa. Our results imply that the extent of black ornamentation may serve as an honest indicator of male competitiveness
in those species that evolved an appropriate hormonal basis (T dependence) for color production.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. 相似文献
45.
劳动河水质的模糊综合评价及分析 总被引:5,自引:0,他引:5
利用劳动河8个点位的水质监测数据,以地面水环境质量为标准,运用模糊数学方法,分析劳动河各点位污染状况,综合评价劳动河水质污染程度,确定主要污染点位及主要污染因子,为劳动河污染控制提供科学依据。 相似文献
46.
随着农村经济的不断发展,农村环境污染日趋严重。虽然吉林省在农村环境污染防治和生态保护方面取得了一些成效,但农村环保工作仍然十分薄弱。农村环境连片整治示范项目以饮用水水源保护和人居环境质量改善为主要目标,重点支持农村饮用水水源地保护、生活污水和生活垃圾污染治理、畜禽养殖污染治理与综合利用等项目。基于吉林省农村环境存在的共性问题和污染成因分析,有关人士提出了“切实保护农村饮用水源地,加强村庄生活污染治理力度,畜禽养殖污染治理,工矿企业污染治理,农业面源污染治理”等五方面治理措施,有利于促进全省农村环境的有效改善。 相似文献
47.
In this study five design dimensions are varied systematically investigating context-induced status quo effects in choice experiments. Additionally, two structural complexity measures, entropy and the number of attribute level changes, are used to capture status quo effects from the similarity between alternatives and the number of trade-offs. A crucial finding is that the frequency of status quo choices is negatively associated with the number of alternatives indicating preference matching effects. By contrast, the probability of choosing the status quo increases with a higher number of choice tasks, a wider level range, and the similarity between alternatives. Status quo choices are further affected by the current environmental situation perceived by respondents. We also find that marginal and non-marginal welfare estimates are significantly affected by the choice design. One key finding is that the most used choice task format in environmental economics, i.e., two hypothetical and a status quo alternative, is likely to increase the propensity to choose the status quo option. 相似文献
48.
介绍和分析了农药对我国生态环境污染与危害的现状。指出造成我国农药环境污染严重的重要原因是缺乏必要的环境监督管理 ,研究制定出符合我国国情的农药污染控制政策与措施已经刻不容缓 相似文献
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东辽县畜禽养殖污染现状及对策研究 总被引:1,自引:0,他引:1
根据第一次全国污染源普查成果,对东辽县畜禽养殖业污染现状进行了介绍,指出了畜禽养殖污染主要是专业化畜禽养殖造成的,专业化畜禽养殖污染是农村面源污染的主要来源,已成为影响环境质量的重要因素。据此,提出了防治畜禽养殖污染的对策。 相似文献