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排序方式: 共有394条查询结果,搜索用时 171 毫秒
91.
天南星(Arisaema erubescens Schott)及其与链霉菌配伍灭螺效果 总被引:8,自引:0,他引:8
天南星水浸液及其与链霉菌稀释液配伍,用于灭螺实验,结果显示,天南星具有很强的灭螺效果,不同部位的灭螺效果为:根>叶>茎。其中根的灭螺效果与夹竹桃相当。天南星与链霉菌配伍使用,具有明显的协同作用,是单一成分的4~5倍,比夹竹桃与链霉菌复合使用的协同作用更明显,且能有效地抑制钉螺上爬。因此,天南星为灭螺植物和构建高效的群落生态工程灭螺提供新的物种资源;这种植物和微生物的复合灭螺的协同效应,为灭螺工作提供新的思路。 相似文献
92.
Der Beitrag umfa?t eine übersicht über die Entwicklung wesentlicher Segmente des in Deutschland und international zug?nglichen
Angebots an Umweltdatenbanken. Anschlie?end werden wichtige Umweltdatenbanken im Angebot von STN International dargestellt.
Anhand ausgew?hlter Beispiele aus der Recherchepraxis werden schlie?lich Ablauf (Stufen der Vorbereitung, Durchführung und
Nachbereitung) sowie Ergebnisse der Online-Recherche in wichtigen STN-Umweltdatenbanken dargestellt. 相似文献
93.
Burkhard O. Wagner 《Umweltwissenschaften und Schadstoff-Forschung》1998,10(4):245-253
Zusammenfassung UNEP International Register of Potentially Toxic Chemicals (IRPTC) wurde von der ersten VN-Umweltkonferenz 1972 geschaffen.
Sein Einfu? und Zusammenwirken in den 80ziger Jahren mit anderen internationalen Programmen der WHO, FAO, OECD und EG in der
Chemikalienkontrolle wird beschrieben. Nach dem Erdgipfel von Rio 1992 werden im VN-Rahmen drei neue Gremien gebildet, die
das Fachprogramm des Kapitels 19 der Agenda 21 (umweltfreundliches Chemikalienmanagement) umsetzen sollen: die United nations
Commission of Sustainable Development, das Intergovernmental Forum on Chemical Safety und das Interorganization Programme
for the Sound Management of Chemicals. Der Erdgipfel brachte auch für IRPTC eine Neuorientierung. Seit 1996 hat UNEP Chemicals,
wie sich IRPTC nunmehr nennt, drei Aufgaben in sein Arbeitsprogramm aufgenommen, die beschrieben werden: das internationale
übereinkommen zum Prior Informed Consent, das internationale übereinkommen zur Kontrolle der Persistent Organic Pollutants,
und schlie?lich sein traditionelles Arbeitsgebiet des Informations-austausches über Stoffe wird weitergeführt.
Die Aussagen dieses Beitrages sind die Meinung des Autors. Sie müssen nicht mit der Auffassung des Umweitbundesamtes oder von UNEP Chemicals übereinstimmen. 相似文献
Die Aussagen dieses Beitrages sind die Meinung des Autors. Sie müssen nicht mit der Auffassung des Umweitbundesamtes oder von UNEP Chemicals übereinstimmen. 相似文献
94.
Kevin Siqueira 《Journal of Environmental Economics and Management》2003,45(3):674-691
Domestic politics can sometimes play an influential role when externalities have strategic and international implications. If voters delegate the choice to policymakers and if individual countries independently determine their environmental policy using a consumption tax on the emissions generating good, the result could be an outcome that is inferior to the one preferred by the median voter in the absence of delegation. On the other hand, if the international externality is unilateral in nature, rather than reciprocal, we find that delegation is largely irrelevant, since voters’ choice of policymaker is no longer strategic in character. Similarly, if voters anticipate policymakers successfully coordinating their policies at a later stage, there also will be no difference between the policymakers’ and the median voters’ aggregate weighting of environmental emissions. 相似文献
95.
How Kentish plovers,<Emphasis Type="Italic"> Charadrius alexandrinus</Emphasis>, cope with heat stress during incubation 总被引:2,自引:0,他引:2
Biparental incubation is frequent among shorebirds and is expected when the survival prospects of offspring increase relative to uniparental incubation. To understand why this occurs, it is important to identify the factors that constrain uniparental incubation. It is assumed that birds choose nesting sites that provide an appropriate microclimate for incubation. Many shorebirds nest in sites with no or little cover, where ambient temperatures at ground level might be >50°C during very hot days. Shorebirds nest in exposed sites because predation risk on incubating adults is higher in covered sites. In hot environments, incubating shorebirds might experience heat stress in exposed sites, and this may compromise nesting success if adults are unable to attend their nests continuously, limiting the possibilities of uniparental incubation and thus the expression of a sexual conflict over incubation. The operative temperatures of Kentish plovers (Charadrius alexandrinus) were recorded in exposed and covered sites, and the thermal behaviour and incubating tactics of pair members were studied in a hot environment. During the hottest part of the day, there was a difference of 10–15°C in the operative temperatures of plovers between covered and exposed sites. Plovers in covered sites did not exhibit any thermoregulatory behaviour indicative of thermal stress, probably because the thermal range encountered by them in such places during most of the daytime was close to the thermo-neutral zone. The frequency with which plovers in exposed sites exhibited thermoregulatory behaviour was related to ambient temperature. Under very hot conditions, incubating birds were probably unable to maintain homeostasis for long periods and pair members resorted to shortening incubation bouts. Female Kentish plovers mainly incubate in the daytime and males during the night. However, the probability of diurnal incubation by males increased with ambient temperature in exposed nests, but not in covered ones. In fact, the frequency of participation in diurnal incubation by males was greater in exposed than in covered sites, suggesting that the participation of males in diurnal incubation may be related to the inability of females to stay at the nest during long periods when the ambient temperature is high. Even after resorting to shortened incubation bouts, the plovers may be unable to attend their nests continuously during heat waves, and the nests may be deserted. The propensity of plovers to desert their nests was affected by proximity to water, with nests located close to water being deserted less frequently. It seems likely that susceptibility to thermal stress changed in relation to proximity to water because in sites close to water it was possible to belly-soak, which would allow a more continuous nest attendance. Therefore, despite the adoption of behavioural solutions to face heavy heat loads, nesting success was vulnerable to these solutions because heat stress during extended periods may constrain parental nest attendance, and this may limit the opportunities for sexual conflicts over incubation.Communicated by J. Graves 相似文献
96.
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99.
改善环境规划管理 促进沈阳的可持续发展 总被引:2,自引:0,他引:2
结合正在实施之中的“沈阳可持续发展项目”,论述了通过消除沈阳环境规划管理方面的制约因素 ,加强发展过程中的跨部门协调合作、民主决策和公众广泛参与的机制 ,促进沈阳市社会、经济和环境全面的持续发展 相似文献
100.
《组织行为杂志》2017,38(3):372-390
Music as an environmental aspect of professional workplaces has been closely studied with respect to consumer behavior while sparse attention has been given to its relevance for employee behavior. In this article, we focus on the influence of music upon cooperative behavior within decision‐making groups. Based on results from two extended 20‐round public goods experiments, we find that happy music significantly and positively influences cooperative behavior. We also find a significant positive association between mood and cooperative behavior. Consequently, while our studies provide partial support for the relevance of affect in relation to cooperation within groups, we also show an independently important function of happy music that fits with a theory of synchronous and rhythmic activity as a social lubricant. More generally, our findings indicate that music and perhaps other atmospheric variables that are designed to prime consumer behavior might have comparably important effects for employees and consequently warrant closer investigation. Copyright © 2016 The Authors Journal of Organizational Behavior Published by John Wiley & Sons Ltd. 相似文献