近江牡蛎作为重金属污染生物指示种的初步研究   总被引：17，自引：2，他引：17  

陆超华 《台湾海峡》1994,13(1):14-20

对近江牡砺作为监测广东岸海域Ｃｕ，Ｚｎ，Ｃｄ，Ｐｂ污染的生物指示种的可能性进行了初步研究和评价，应用ＰＯＬＹＤＩＶ统计技术对采自广东沿岩海域１４个站点的近江牡盛的重金属含量进行了统计分析，结果表明近江牡蛎受Ｃｕ，Ｚｎ，Ｃｄ污染的地理分布类型与广东沿海排放的工业废水的分布以及潮间带生物和表层沉积物的Ｃｕ，Ｚｎ，Ｃｄ含量分布相一致，因此，近江牡蛎可作为监测研究Ｃｕ，Ｚｎ，Ｃｄ污染的可靠生物指示种，但能  相似文献   

Viability theory for an ecosystem approach to fisheries   总被引：1，自引：1，他引：1  

Cury  Philippe M.; Mullon  Christian; Garcia  Serge M.; Shannon  Lynne J. 《ICES Journal of Marine Science》2005,62(3):577-584

  相似文献   

海水甲壳类人工育苗过程中的水质控制     

朱明  茅云翔  张学成  阎斌伦  藤亚娟 《海洋湖沼通报》2002,(4):72-75

水质控制是海水甲壳类人工育苗中的关键技术之一，但是囿于设备条件的限制而难以有效进行，本文总结出两种简便的水质检测指标；pH值和水质指示生物，并对水质控制的一般原理方法进行了初步的探讨。  相似文献   

Impact of urban stormwater runoff on estuarine environmental quality     

Hueiwang Anna C. Jeng  Andrew J. Englande  Reda M. Bakeer  Henry B. Bradford 《Estuarine, Coastal and Shelf Science》2005,63(4):513-526

Urban stormwater runoff could contribute to the deterioration of water quality of a receiving water body. In this research, field studies and laboratory experiments were conducted to assess the microbial contamination resulting from urban stormwater runoff into the Lake Pontchartrain estuary. Fecal coliform, Escherichia coli and enterococci were used as indicator organisms. The specific objectives of the research were to examine the distribution of the indicator organisms in different environmental elements (water column, suspended particles and sediment) and to further investigate the mechanisms related to their fate. Results of the research indicated satisfactory water quality at the study sites during dry weather periods. However, a significant increase was observed in the concentrations of the indicator organisms in the water columns and sediment at specific study sites following a given stormwater event. Three to seven days were needed for the elevated indicator organisms to return back to their background levels in the water column and sediment, respectively. The mechanism of sedimentation contributed to a reduction in the microbial concentration in the water column, as the indicator organisms were found to attach to the suspended particles in the stormwater. The percentage of fecal coliform, E. coli and enterococci attached to the suspended particles was found to be within the range of 9.8–27.5%, 21.8–30.4%, and 8.4–11.5% of the total indicator organisms in the stormwater loaded into the estuary, respectively. About 75–80% of the total indicator organisms remained free-floating for some distance in the water column before dying off.  相似文献   

Rare-earth elements as source indicators of Pan-African granites from Obudu Plateau,Southeastern Nigeria   总被引：1，自引：1，他引：0  

V. U. Ukaegbu  F. T. Beka 《中国地球化学学报》2008,27(2):130-134

The rare-earth element （REE） concentrations of representative granite samples from the southeast of the Obudu Plateau, Nigeria, were analyzed with an attempt to determine the signatures of their source, evolutionary history and tectonic setting. Results indicated that the granites have high absolute REE concentrations （190×10^-6-1191×10^-6; av.=549×10^-6） with the chondrite-normalized REE patterns characterized by steep negative slopes and prominent to slight or no negative Eu anomalies. All the samples are also characterized by high and variable concentrations of the LREE （151×10^-6-1169×10^-6; av.= 466×10^-6）, while the HREE show low abundance （4×10^-6-107×10^-6; av.=28×10^-6）. These are consistent with the variable levels of REE fractionation, and differentiation of the granites. This is further supported by the range of REE contents, the chondrite-normalized patterns and the ratios of LaN/YbN （2.30-343.37）, CeN/YbN （5.94-716.87）, LaN/SmN （3.14-11.68） and TbN/YbN （0.58-1.65）. The general parallelism of the REE patterns, suggest that all the granites were comagmatic in origin, while the high Eu/Eu＊ ratios （0.085-2.807; av.=0.9398） indicate high fo2 at the source. Similarly, irregular variations in LaN/YbN, CeN/YbN and Eu/Eu＊ ratios and REE abundances among the samples suggest behaviors that are related to mantle and crustal sources.  相似文献   

Early Uplift History of the Tibetan Plateau:Records from Paleocurrents and Paleodrainage in the Hoh Xil Basin     

YI Haisheng  WANG Chengshan  SHI Zhiqiang  LIN Jinhui  ZHU Lidong 《《地质学报》英文版》2008,82(1):206-213

Paleocurrent indicator data collected in field work were used to study the early Cenozoic regional paleodrainage patterns in the Hob Xil basin in northern Tibetan plateau. The paleocurrent directions of the Eocene Fenghuoshan Group obviously show that the flows were northward with a unidirectional dispersal pattern. This probably reflects the uplift of the Qiangtang terrain during the initial basin deposition period and indicates that the Tanggula Moutains occurred as topographic highlands at least in the Eocene. Paleoflows of the Oligocene Yaxicuo Group were dominantly oriented to the north and then flowed eastwards during its late deposition. This regional variability of paleodrainage patterns of the Yaxicuo Group is interpreted to record the dispersal style of sediments from transverse rivers to longitudinal river systems. It is inferred that the Oligocene uplift of the Kunlun Mountains obstructed by northward paleoflows and created longitudinal river systems parallel to the orogenic belts. The temporal and spatial changes of the paleodrainage patterns suggest that the northern boundary of the Tibetan plateau during the early Cenozoic was situated in the Hoh Xil area and its uplift has progressed northwards through time.  相似文献   

上扬子区(四川盆地)寒武系的含盐性与地质背景          下载免费PDF全文

黄建国 《沉积与特提斯地质》1993,(5):44-56

据记载,分布于上扬子区寒武系的石膏岩仅有零星资料。如今,大量蒸发岩如溶蚀角砾岩、硬石膏、石盐岩及富钾卤水等已被发现。沉积相经历了从盆地相、台地相到蒸发岩相的演化过程。在中、下寒武统中找到海退沉积序列。古构造-古地理背景是蒸发岩沉积的重要控矿条件之一。周边板块运动及塑性基底的褶皱,导致台缘隆起及台内坳陷的形成。岩相古地理图展示从碳酸盐、硫酸盐到氯化物盐类的“泪滴式”沉积相带。蒸发岩沉积于台缘隆起及礁生长进入堰塞潟湖至盐湖阶段。在稳定坳陷区沉积盆地中蒸发岩系发育;石盐岩较厚,其溴氯比值为0.2—0.4;古气候炎热、干燥;在蒸发岩体周围有沉积(封层)水及溶滤水,其含钾(K~+)量为0.10—4.76g/L;水文地球化学比值(如钾氯比值、钾盐比值及钾溴比值等)指示含钾异常;盐湖浓缩卤水达到氯化物盐类沉积阶段及相应的构造封闭程度;含盐地质标志广泛分布等等。鉴于上述,估计该区可能具备钾盐成矿条件。然而目的层埋藏太深,因此笔者建议,应在浅埋部位进行有效的成矿预测,为普查指出远景区。  相似文献   

可持续发展评估指标、方法及应用研究   总被引：31，自引：1，他引：31  

张志强  程国栋  徐中民 《冰川冻土》2002,24(4):344-360

可持续发展评估指标及方法研究是可持续发展定量评估研究的基础,是实施可持续发展管理的依据,是生态经济学与可持续发展研究的前沿领域和热点问题之一. 在概括介绍可持续发展评估的工具--指标/指数的概念和功能、国际上代表性可持续发展研究机构指标选取的原则的基础上,全面分析归纳了可持续发展指标(体系)的类型及其框架模式. 详细介绍了联合国可持续发展委员会(UNCSD)、经济合作与发展组织(OECD)、世界保护同盟(IUCN)、世界银行等国际上代表性机构的可持续发展系统性指标体系的最新研究进展,并分析了这些系统性指标体系的优缺点. 深入分析了国际上典型的社会发展类、经济发展类、生态环境类可持续发展指标(指数)的研究、开发与实际评估应用的情况. 最后,总结了当前可持续发展指标(体系)研究的特点与趋势.  相似文献   

成都市生态环境地球化学特点   总被引：10，自引：0，他引：10  

赵琦  李萍  周平 《四川地质学报》2002,22(4):231-235

成都平原多目标地球化学调查表明，成都市区土壤Hg、Ag、Pb、Cu、Zn、Sb、P、S、Se、C、Sr、Mo、Na2O等13种元素和河流水系沉积物P、Hg、S、Zn、Pb、Cu、Mo等有机质、N、Cd、Cr等11种高含量元素，土壤中主要污染元素Hg、Pb、Zn、Cu的含量，在浅层样中较高，其污染状况市区内及工厂区比城郊严重，府河，南河的污染比沙河严重，但其污泥可以综合利用，研究表明，东部龙泉山区深层样丰富的农业有益元素为水果生长提供了有利条件。  相似文献   

锡铁山铅锌矿地质特征、矿床成因及找矿标志   总被引：4，自引：1，他引：4  

李如满  汪树栋 《矿产与地质》2003,17(3):218-221

通过找矿工作的实践，认为锡铁山铅锌矿床是由火山喷流沉积—后期热液叠加改造富集的块状硫化物多金属矿床。区域上NW—SE向早古生代形成的裂谷带，三级盆地内沉积的晚奥陶世滩间山群的大理岩与绿片岩系是表区找矿的最佳区段。而绢云绿泥斜长片岩、含碳质绢云绿泥片岩、白色大理岩、条带状大理岩是铅锌矿的最重要的找矿标志。  相似文献