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811.
Yong Jiang Henglong Xu Xiaozhong Hu Alan Warren Weibo Song 《Environmental science and pollution research international》2013,20(8):5272-5280
Ciliated protozoa (ciliates) play important ecological roles in coastal waters, especially regarding their interaction with environmental parameters. In order to increase our knowledge and understanding on the functional structure of ciliate communities and their relationships to environmental conditions in marine ecosystems, a 12-month study was carried out in a semi-enclosed bay in northern China. Samples were collected biweekly at five sampling stations with differing levels of pollution/eutrophication, giving a total of 120 samples. Thirteen functional groups of ciliates (A–M) were defined based on their specific spatio-temporal distribution and relationships to physico-chemical parameters. Six of these groups (H–M) were the primary contributors to the ciliate communities in the polluted/eutrophic areas, whereas the other seven groups (A–G) dominated the communities in less polluted areas. Six groups (A, D, G, H, I and K) dominated during the warm seasons (summer and autumn), with the other seven (B, C, E, F, J, L and M) dominating in the cold seasons (spring and winter). Of these, groups B (mainly aloricate ciliates), I (aloricate ciliates) and L (mainly loricate tintinnids) were the primary contributors to the communities. It was also shown that aloricate ciliates and tintinnids represented different roles in structuring and functioning of the communities. The results suggest that the ciliate communities may be constructed by several functional groups in response to the environmental conditions. Thus, we conclude that these functional groups might be potentially useful bioindicators for bioassessment and conservation in marine habitats. 相似文献
812.
Distribution and temporal trend of polybrominated diphenyl ethers in one Shanghai municipal landfill, China 总被引:1,自引:0,他引:1
Kai Huang Jie Guo Kuang-fei Lin Xiao-yu Zhou Jun-xia Wang Peng Zhou Feng Xu Mei-Lan Zhang 《Environmental science and pollution research international》2013,20(8):5299-5308
The scarcity of information on polybrominated diphenyl ethers’ (PBDEs) flow in landfill restricts the life cycle analysis of PBDEs. In this study, eight PBDE congeners (BDEs 28, 47, 99, 100, 153, 154, 183, and 209) in topsoil, vegetation leaves, leachate, and municipal aged refuse collected from Shanghai Laogang Municipal Landfill (SLML) were investigated. The present study revealed elevated PBDE concentrations in topsoil and proved PBDE leakage from SLML and vegetation uptake. BDE-209 was the predominant congener, and this could be due to massive usage of deca-BDE mixture in Shanghai. ΣPBDE concentrations in leachates treated by reed wetland and A2/O process fell in the low end of the worldwide range. ΣPBDE concentrations in aged refuse samples rose from under 50 ng/g dw in 1989 to the range of 5,150–5,718 ng/g dw in 2002. PBDE concentrations increase in aged refuse samples throughout the 1990s into the 2000s paralleled municipal solid waste output from 1991 to 2002 in Shanghai. Exponential increase in BDE-209 concentration in aged refuse suggested the increasing market demands for deca-BDE mixture after 1990 in China. Notably, the inventory of PBDEs in SLML was 28.7 MT, and the doubling time of BDE-209 in aged refuse was calculated to be 1.6 year. SLML can be considered as a source of PBDE and one main recipient of PBDE as well, receiving inputs predominantly from the PBDE-containing waste. Priority should be given to formulate regulation on PBDEs and sorting work before landfill disposal. 相似文献
813.
H(+)/phenanthrene symporter and aquaglyceroporin are implicated in phenanthrene uptake by wheat (Triticum aestivum L.) roots 总被引:1,自引:0,他引:1
Zhan X Zhang X Yin X Ma H Liang J Zhou L Jiang T Xu G 《Journal of environmental quality》2012,41(1):188-196
Polycyclic aromatic hydrocarbons (PAHs) are ubiquitous organic pollutants that are toxic to human and nonhuman organisms. Dietary intake of PAHs is a dominant route of exposure for the general population because food crops are a major source of dietary PAHs. The mechanism for crop root uptake of PAHs remains unclear. Here we reveal that wheat root uptake of PAHs involves active and passive processes. The passive uptake is mercury and glycerol dependent. Mercury and glycerol inhibit uptake, indicating that aquaglyceroporins sensitive to mercury contribute to passive uptake. Active uptake is mediated by a phenanthrene/H symporter. The electrical response of wheat roots triggered by phenanthrene consists of two sequential phases: depolarization followed by repolarization. The depolarization is phenanthrene concentration dependent, with saturation kinetics that have an apparent of K(m) 10.8 μmol L(-1). As uptake proceeds, external solution pH increase is noticed. Lower pH favors the uptake. Vanadate and 2,4-dinitrophenol suppress the electrical response to phenanthrene and phenanthrene uptake, suggesting that plasma membrane H(+)-ATPase is involved in the establishment of an electrochemical proton gradient acting as a driving force for active uptake. Therefore, it is suggested that aquaglyceroporin and phenanthrene/H symporter are implicated in phenanthrene uptake. Our results provide insight into PAH uptake mechanism in wheat roots that is relevant to strategies for reducing PAH accumulation in wheat for food safety, improving phytoremediation of PAH-contaminated soils or water by agronomic practices and genetic modification to target remedial plants for higher PAH uptake capacity. 相似文献
814.
815.
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817.
水利旅游是水利经济的新兴增长点,吸引力评价是旅游开发的基础性研究。借鉴引力理论,构建了由25个指标组成的水利旅游吸引力评价指标体系,运用AHP—PCA—Borda主客观组合评价法,对我国水利旅游吸引力进行了实证评价。结果表明,水利旅游吸引力地区不平衡,江苏、广东、山东、湖北、河南、浙江、湖南、北京和江西等省水利旅游吸引力较强,西部省份和处于我国版图中轴线附近的省份水利旅游吸引力较弱。 相似文献
818.
819.
近年来,随着经济的发展,高压输变电工程和移动通信基站越来越多地落户于大型居民小区,由此引发的环境投诉和纠纷呈快速上涨趋势。电磁辐射污染投诉产生的原因主要是:电磁辐射环境管理法制不健全,思想上不重视,项目环保审批环节脱节,环保与规划部门信息交流不畅,公众维权意识增强,寻求其他经济利益;针对原因提出的预防和解决办法为:加强法制建设、强化现场监管,理顺项目审批和监管程序,建立与规划部门的联动机制,加强宣传,引导司法解决。 相似文献
820.
Release of domestic sewage leads to accumulation of xenoestrogens in holding waters, especially in closed or semi-enclosed waters such as lakes. In the study, the occurrence, distribution, estrogenic activity and risk of eight xenoestreogens were evaluated in Lake Donghu, China. Nonylphenol (NP), octylphenol (OP), and bisphenol A (BPA) were identified as the main xenoestrogens ranging from tens of ng L−1 (in the surface water) or ng g−1 dw (in the suspended particles and sediment) to tens of μg L−1 or μg g−1 dw. The sum of 17β-estradiol equivalents (∑EEQs) ranged from 0.32 to 45.02 ng L−1 in the surface water, 0.53 to 71.86 ng g−1 dw in the suspended particles, and 0.09 to 24.73 ng g−1 dw in the sediment. Diethylstilbestrol (DES) was determined as the main contributor to ∑EEQs followed by NP. The risk assessment showed a higher risk in the surface water than in the suspended particles and sediment in such domestic sewage-holding lake. 相似文献