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排序方式: 共有256条查询结果,搜索用时 62 毫秒
121.
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In this study mechanical-biological pre-treated waste material (MBP) was tested for suitability to serve as an alternative surface layer in combination with fast-growing and water-consumptive trees for final covers at landfill sites. The aim was to quantify evapotranspiration and seepage losses by numerical model simulations for two sites in Germany. In addition, the leaf area index (LAI) of six tree species over the growing season as the driving parameter for transpiration calculations was determined experimentally. The maximum LAI varied between 3.8 and 6.1 m2 m(-2) for poplar and willow clones, respectively. The evapotranspiration calculations revealed that the use of MBP waste material for re-cultivation enhanced evapotranspiration by 40 mm year(-1) (10%) over an 11 year calculation period compared to a standard mineral soil. Between 82% (for LAI(max) = 3.8) and 87% (for LAI(max) = 6.1) of the average annual precipitation (506 mm) could be retained from the surface layer assuming eastern German climate conditions, compared with a retention efficiency between 79 and 82% for a mineral soil. Although a MBP layer in conjunction with water-consumptive trees can reduce vertical water losses as compared to mineral substrates, the effect is not sufficient to meet legal regulations. 相似文献
124.
Theresa M. Marteau Irma Nippert Sue Hall Caroline Limbert Margaret Reid Martin Bobrow Alan Cameron Martina Cornel Mariet van Diem Bernd Eiben Sixto García-Miñaur Janine Goujard Donna Kirwan Karen McIntosh Peter Soothill Corien Verschuuren-Bemelmans Catherine de Vigan Stephen Walkinshaw Lenore Abramsky Frank Louwen Peter Miny Jürgen Horst 《黑龙江环境通报》2002,22(7):562-566
125.
Bernd Lehmann 《Die Naturwissenschaften》1994,81(3):108-114
Professor Dr. Hans-Jochen Schneider zum 70. Geburtstag gewidmet 相似文献
126.
Thomas W. Bodey Elena Angulo Alok Bang Céline Bellard Jean Fantle-Lepczyk Bernd Lenzner Anna Turbelin Yuya Watari Franck Courchamp 《Conservation biology》2023,37(2):e14034
Biological invasions represent a key threat to insular systems and have pronounced impacts across environments and economies. The ecological impacts have received substantial focus, but the socioeconomic impacts are poorly synthesized across spatial and temporal scales. We used the InvaCost database, the most comprehensive assessment of published economic costs of invasive species, to assess economic impacts on islands worldwide. We analyzed socioeconomic costs across differing expenditure types and examined temporal trends across islands that differ in their political geography—island nation states, overseas territories, and islands of continental countries. Over US$36 billion in total costs (including damages and management) has occurred on islands from 1965 to 2020 due to invasive species’ impacts. Nation states incurred the greatest total and management costs, and islands of continental countries incurred costs of similar magnitude, both far higher than those in overseas territories. Damage-loss costs were significantly lower, but with qualitatively similar patterns across differing political geographies. The predominance of management spending differs from the pattern found for most countries examined and suggests important knowledge gaps in the extent of many damage-related socioeconomic impacts. Nation states spent the greatest proportion of their gross domestic products countering these costs, at least 1 order of magnitude higher than other locations. Most costs were borne by authorities and stakeholders, demonstrating the key role of governmental and nongovernmental bodies in addressing island invasions. Temporal trends revealed cost increases across all island types, potentially reflecting efforts to tackle invasive species at larger, more socially complex scales. Nevertheless, the already high total economic costs of island invasions substantiate the role of biosecurity in reducing and preventing invasive species arrivals to reduce strains on limited financial resources and avoid threats to sustainable development goals. 相似文献
127.
Regnery Julia Friesen Anton Geduhn Anke Göckener Bernd Kotthoff Matthias Parrhysius Pia Petersohn Eleonora Reifferscheid Georg Schmolz Erik Schulz Robert S. Schwarzbauer Jan Brinke Marvin 《Environmental Chemistry Letters》2019,17(1):215-240
Environmental Chemistry Letters - Anticoagulant rodenticides are used worldwide to control commensal rodents for hygienic and public health reasons. As anticoagulants act on all vertebrates, risk... 相似文献
128.
Cor Dijkstra Bernd Riedstra Arjan Dekker Vivian C. Goerlich Serge Daan Ton G. G. Groothuis 《Behavioral ecology and sociobiology》2010,64(9):1393-1402
When the reproductive value of male and female offspring varies differentially, parents are predicted to adjust the sex ratio
of their offspring to maximize their fitness (Trivers and Willard, Science 179:90–92, 1973). Two factors have been repeatedly linked to skews in avian offspring sex ratio. First, laying date can affect offspring
sex ratio when the sexes differ in age of first reproduction, such that the more slowly maturing sex is overproduced early
in the season. Second, position of the egg in the laying sequence of a clutch may affect sex ratio bias since manipulating
the sex of the first eggs may be least costly to the mother. We studied both factors in two non-domesticated pigeon species.
Both the Wood pigeon (Columba palumbus) and the Rock pigeon (Columba livia) have long breeding seasons and lay two-egg clutches. In the field, we determined the sex of Wood pigeon nestlings. In Rock
pigeons, housed in captivity outdoors, we determined embryo sex after 3 days of incubation. On the basis of their sex-specific
age of first reproduction, we predicted that males, maturing at older age than females, should be produced in majority early
and females later in the year. This was confirmed for both species. The bias was restricted to first eggs. Rock pigeons produced
clutches throughout the year and show that the sex of the first egg followed an annual cycle. To our knowledge, this study
presents the first evidence of a full annual rhythm in adaptive sex allocation in birds. We suggest that this reflects an
endogenous seasonal program in primary sex ratio controlled by a preovulatory mechanism. 相似文献
129.
Bernd Klauer 《国际发展与全球生态学杂志》2013,20(2):114-121
SUMMARY This paper analyses the fundamental problems of defining and achieving sustainable development. A common core of the various definitions of sustainability circulating is identified. Economic and scientific approaches to operationalize sustainability generally lead to management rules, which — if obeyed — should guarantee sustainability. Since it is not possible to precisely predict the future, this scientific—technical—economic route to sustainability may fail. A second, ethical way, to sustainability which interprets sustainability as an ideal for fair play is introduced. How the two different ways may complement one another with a three-step hierarchy of political goals is elucidated. 相似文献
130.
Bernd Freibott 《现代职业安全》2014,(2)
本文通过诠释EHS集成解决方案架构的路线图,告诉我们,EHS应被视为生产链和运营流程的一部分,而不仅仅是公司信息化建设中的一座孤岛。公司要想卓越地安全运营,其安全管理信息化就必须从全局去审视,它不仅应像神经元网络一样,具有灵活度和敏捷度,更要渗透到"个人",如此才能创建出公司整体的安全文化。 相似文献