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2.
嘉定城区河流水质现状评价及污染防治对策 总被引:1,自引:0,他引:1
通过对嘉定中心城区河流的水质现状调查和评价,提出了引清排污、加强市政措施等污染防治对策。 相似文献
3.
Gaverick?Matheny Kai?M.?A.?ChanEmail author 《Journal of Agricultural and Environmental Ethics》2005,18(6):579-594
Few moral arguments have been made against vegetarian diets. One exception is the “Logic of the Larder:” We do animals a favor
by purchasing their meat, eggs, and milk, for if we did not purchase these products, fewer animals would exist. This argument
fails because many farm animals have lives that are probably not worth living, while others prevent a significant number of
wild animals from existing. Even if this were not so, the purchase of animal products uses resources that could otherwise
be used to bring a much greater number of animals into existence. 相似文献
4.
在野外原位围隔模拟条件下,研究了鱼类、底栖动物和水生植物的不同组合对富营养化水体的净化效果。研究结果表明:鲢鳙鱼比例对水质有较大影响,当鲢鱼(Hypophthalmichthys molitix)与鳙鱼(Aristichthys nobilis)的比例为3:1时,TN和NH3-N的去除率分别为69.26%和66.39%,4:1时,NO3-N的去除率可达73.65%;当鲢鱼与鳙鱼的比例为5:1时,TP和PO43-的去除率可达66.73%;鲴鱼(Plagiognathops Microlepis Bleeker)对水体中磷元素的去除效果显著,TP和PO43-的去除率可分别提高13.89%和7.91%,但不利于氮的去除;150 g·m-2密度螺(Bellamya aeruginosa)和蚌(Hyriopsis cumingii)的投加对TN的去除率可达72.60%,但对其他营养盐的削减效果不佳;水生植物蕹菜实验组与无植物组相比TN去除率提升6.83%,NH3-N提升6.44%,NO3-N提升12.14%,效果优于菱,但却不利于磷的去除。实验结果可为水生生态系统调控和修复提供科学依据。 相似文献
5.
凤眼莲在净化废水方面的应用 总被引:3,自引:0,他引:3
本文初步探讨了凤眼莲在净化废水方面的应用效果。结果表明,凤眼莲对生活废水具有较强的适应能力和净化效果。同时,其经特殊的处理后钻井废水中也能较正常生长、繁殖,并起一定的净化作用。文中就废水pH对凤眼莲的影响作了初步实验探讨,对凤眼莲净化废水机理也作了简述。 相似文献
6.
珠江口水、沉积物及水生动物中氯苯类有机物的含量及分布 总被引:13,自引:0,他引:13
对珠江口水、沉积物及水生动物体内氯苯类有机物(CBs)的污染现状进行了调查,并对该类污染物在水体多介质体系中的转移分配规律进行了初步研究1.结果表明,珠江口表层水中CBs的总浓度为16.44~963.20ng·L-,DCBs(二氯苯)对污染的贡献较为突出,占74.4%;表层沉积物(干重)中CBs总含量为7.83~40.09 ng·g-1,DCBs、TCBs(三氯苯)、TeCBs(四氯苯)、PeCB(五氯苯)和HCB(六氯苯)分别占总量的71.4%、11.1%、13.0%、1.2%、3.6%;水生动物中贝类的CBs平均含量是38873.0ng·g-1、鱼类为2360.3ng·g-1、虾类则为565.0ng·g-1,DCBs和TeCBs是水生动物体内的主要污染物.CBs在水、沉积物及生物体之间存在明显的富集和放大作用. 相似文献
7.
Kimberly K. Smith 《Journal of Agricultural and Environmental Ethics》2009,22(3):241-256
Elizabeth Anderson’s “pluralist–expressivist” value theory, an alternative to the understanding of value and rationality underlying
the “rational actor” model of human behavior, provides rich resources for addressing questions of environmental and animal
ethics. It is particularly well-suited to help us think about the ethics of commodification, as I demonstrate in this critique
of the pet trade. I argue that Anderson’s approach identifies the proper grounds for criticizing the commodification of animals,
and directs our attention to the importance of maintaining social practices and institutions that respect the social meanings of animals. Her theory alone, however, does not adequately address the role of the state in this project. Drawing on social
contract theory to fill this gap, I conclude that the state’s role in regulating the pet trade should be limited to ensuring
the welfare of animals in the stream of commerce, not prohibiting their mass marketing altogether. 相似文献
8.
ANNA M. PIDGEON CURTIS H. FLATHER VOLKER C. RADELOFF CHRISTOPHER A. LEPCZYK NICHOLAS S. KEULER ERIC M. WOOD SUSAN I. STEWART ROGER B. HAMMER 《Conservation biology》2014,28(5):1291-1301
As people encroach increasingly on natural areas, one question is how this affects avian biodiversity. The answer to this is partly scale‐dependent. At broad scales, human populations and biodiversity concentrate in the same areas and are positively associated, but at local scales people and biodiversity are negatively associated with biodiversity. We investigated whether there is also a systematic temporal trend in the relationship between bird biodiversity and housing development. We used linear regression to examine associations between forest bird species richness and housing growth in the conterminous United States over 30 years. Our data sources were the North American Breeding Bird Survey and the 2000 decennial U.S. Census. In the 9 largest forested ecoregions, housing density increased continually over time. Across the conterminous United States, the association between bird species richness and housing density was positive for virtually all guilds except ground nesting birds. We found a systematic trajectory of declining bird species richness as housing increased through time. In more recently developed ecoregions, where housing density was still low, the association with bird species richness was neutral or positive. In ecoregions that were developed earlier and where housing density was highest, the association of housing density with bird species richness for most guilds was negative and grew stronger with advancing decades. We propose that in general the relationship between human settlement and biodiversity over time unfolds as a 2‐phase process. The first phase is apparently innocuous; associations are positive due to coincidence of low‐density housing with high biodiversity. The second phase is highly detrimental to biodiversity, and increases in housing density are associated with biodiversity losses. The long‐term effect on biodiversity depends on the final housing density. This general pattern can help unify our understanding of the relationship of human encroachment and biodiversity response. Patrones Sistemáticos Temporales en la Relación entre Desarrollos Urbanos y la Biodiversidad de Aves de Bosque 相似文献
9.
刘久祥 《辽宁城乡环境科技》2012,(3):66-68,75
通过对大凌河朝阳段5个采样点9个样本的底栖动物监测分析,检出底栖动物59种,采用BI指数进行水质评价。调查结果表明,大凌河南大桥及上游河段为清洁,市区段下游为轻污染至中污染。 相似文献
10.