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61.
苏州河水环境污染现状分析 总被引:16,自引:2,他引:16
根据水文、水质和污染调查结果,分析了苏州河水质和污染现状和综合环境质量,提出了影响苏州河水的8项主要环境问题;严重的有机污染;底泥对水质的污染;支流对干流的污染;上游来水水质;合流污水系统的溢流;河道不利的水动力条件;航运影响;沿岸景观和陆域布局不合理等。根据这些分析,作者从苏州河的功能定位和治理目标出发,提出了苏州河水环境综合整治的原则设想。 相似文献
62.
Barbara Raffaelli Eija Leppälä Clément Chappuis Kristiina Wähälä 《Environmental Chemistry Letters》2006,4(1):1-9
Seven new dibenzylbutyrolactone and six new dibenzylbutanediol lignans were prepared to assist in the identification of a
number of potential mammalian metabolites of the endocrine disrupting plant lignans syringaresinol and medioresinol, present
in food. 相似文献
63.
博斯腾湖水质变化分析与对策研究 总被引:5,自引:0,他引:5
利用近10年的监测数据,对博斯腾湖水质进行评价。评价结果表明,近10年来博斯腾湖主要污染物浓度呈下降趋势,但仍然污染严重。造成博斯腾湖水污染的原因主要有3个方面,农田灌溉排水、工业废水和生活废水。针对污染成因,提出了相应的污染防止措施;(1)加大地下水开采力度;(2)加大博斯腾湖出水能力(3)加强湖滨湿地生态恢复(4)控制和治理污染源。 相似文献
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66.
几种聚电解质的合成及絮凝性能研究 总被引:3,自引:0,他引:3
合成了5种水溶性聚电解质:①丙烯酰胺-二甲基二烯丙基氯化铵共聚物(AM-DM);②丙烯酰胺-三甲基烯丙基氯化铵共聚物(AM-TM);③水解聚丙烯酰胺(HPAM);④阳离子化聚丙烯酰胺(CPAM)和⑤丙烯酰胺-二甲基二烯丙基氯化铵-丙烯酸(AM-DM-AC)共聚物。对它们的结构进行了红外表征,并就絮凝能力进行了研究。结果表明:5种聚合物均具有絮凝能力且出现两个聚沉点,絮凝能力与聚合物的链结构有关。 相似文献
67.
A Standard Lexicon for Biodiversity Conservation: Unified Classifications of Threats and Actions 总被引:3,自引:0,他引:3
NICK SALAFSKY††† DANIEL SALZER† ALISON J. STATTERSFIELD‡ CRAIG HILTON-TAYLOR§ RACHEL NEUGARTEN† STUART H. M. BUTCHART‡ BEN COLLEN NEIL COX†† LAWRENCE L. MASTER‡‡ SHEILA O'CONNOR§§ DAVID WILKIE 《Conservation biology》2008,22(4):897-911
Abstract: An essential foundation of any science is a standard lexicon. Any given conservation project can be described in terms of the biodiversity targets, direct threats, contributing factors at the project site, and the conservation actions that the project team is employing to change the situation. These common elements can be linked in a causal chain, which represents a theory of change about how the conservation actions are intended to bring about desired project outcomes. If project teams want to describe and share their work and learn from one another, they need a standard and precise lexicon to specifically describe each node along this chain. To date, there have been several independent efforts to develop standard classifications for the direct threats that affect biodiversity and the conservation actions required to counteract these threats. Recognizing that it is far more effective to have only one accepted global scheme, we merged these separate efforts into unified classifications of threats and actions, which we present here. Each classification is a hierarchical listing of terms and associated definitions. The classifications are comprehensive and exclusive at the upper levels of the hierarchy, expandable at the lower levels, and simple, consistent, and scalable at all levels. We tested these classifications by applying them post hoc to 1191 threatened bird species and 737 conservation projects. Almost all threats and actions could be assigned to the new classification systems, save for some cases lacking detailed information. Furthermore, the new classification systems provided an improved way of analyzing and comparing information across projects when compared with earlier systems. We believe that widespread adoption of these classifications will help practitioners more systematically identify threats and appropriate actions, managers to more efficiently set priorities and allocate resources, and most important, facilitate cross‐project learning and the development of a systematic science of conservation. 相似文献
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69.
Tina Heger Anna T. Pahl Zoltan Botta-Dukát Francesca Gherardi Christina Hoppe Ivan Hoste Kurt Jax Leena Lindström Pieter Boets Sylvia Haider Johannes Kollmann Meike J. Wittmann Jonathan M. Jeschke 《Ambio》2013,42(5):527-540
Invasion ecology has much advanced since its early beginnings. Nevertheless, explanation, prediction, and management of biological invasions remain difficult. We argue that progress in invasion research can be accelerated by, first, pointing out difficulties this field is currently facing and, second, looking for measures to overcome them. We see basic and applied research in invasion ecology confronted with difficulties arising from (A) societal issues, e.g., disparate perceptions of invasive species; (B) the peculiarity of the invasion process, e.g., its complexity and context dependency; and (C) the scientific methodology, e.g., imprecise hypotheses. To overcome these difficulties, we propose three key measures: (1) a checklist for definitions to encourage explicit definitions; (2) implementation of a hierarchy of hypotheses (HoH), where general hypotheses branch into specific and precisely testable hypotheses; and (3) platforms for improved communication. These measures may significantly increase conceptual clarity and enhance communication, thus advancing invasion ecology. 相似文献
70.
气候变化问题日益凸显。应对和适应气候变化刻不容缓。然而,短期内无法有效减缓气候变化产生的不利影响。因此,有必要针对不同领域制定相应的适应措施来提高人们对气候变化的适应能力。北京作为人口众多的大城市及我国的缺水城市之一,气候变化无疑将加剧水资源的供需矛盾。本文针对北京市水资源现状及气候变化对北京市水资源领域已经形成的影响,从自然、工程、政策制度三个角度探讨了北京市水资源领域适应气候变化可采取的对策及保障措施。 相似文献