Chemical contamination of a coral reef by the grounding of a cruise ship in Bermuda   总被引：1，自引：0，他引：1  

Jones RJ 《Marine pollution bulletin》2007,54(7):905-911

Bulk metal analyses of surficial sediments collected around the Norwegian Crown cruise ship grounding site in Bermuda indicated significant but localized contamination of reef sediments by copper and zinc, caused by the stripping of the tri-butyltin (TBT)-free antifouling (AF) paint (Intersmooth 460) from the underside of the hull. Highest copper and zinc values were found in heavily compacted and red-pigmented sediments inside the impact scar and were comparable to levels found close to slip ways of local boat yards where AF paints from hull stripping and cleaning processes are washed into the sea. The re-distribution of AF contaminated sediments by storms and deposition on nearby reefs constitutes a significant ecological risk that could delay recovery processes and reduce the effectiveness of remediation efforts. Whilst the ecotoxicological effects of AF paint particles interspersed with sediment is unknown, and in need of further study, it is argued that the significance of AF paint contamination of grounding sites has been overlooked.  相似文献   

青海三色沟铅锌矿地质特征及矿床成因分析?     

宋泽友  赖健清  陶斤金  郭志军 《矿床地质》2010,29(Z5):271-272

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甘肃马泉金矿地质特征及找矿标志     

鲁挑建  姜启明 《华东地质学院学报》2010,33(2):154-158

马泉金矿床定位于礼县—白云—山阳深断裂西段膨大、分支锐角夹持区,受印支期中川花岗岩体南外接触带中近EW向脆韧性剪切带和叠加于该带上的脆性断裂构造控制。通过对矿体空间展布、矿石特征、载金矿物特征等的论述,对矿床成矿地质特征进行总结。今后在该地区找矿因应以花岗岩体的外接触带为找矿的重点部位,地表以褐铁矿为主要找矿标志,深部以黄铁矿和毒砂为找矿标志。  相似文献   

基于集成学习的高光谱遥感影像分类综述     

虞瑶高涵陶旸王圣尧 《测绘与空间地理信息》2023,(4):49-52

高光谱遥感影像光谱维度高、数据量大且波段间冗余信息量大,利用集成学习算法可有效地提升高光谱遥感影像的识别精度。本文首先概述了高光谱遥感影像的分类任务和目前存在的问题,其次介绍了集成学习分类算法的原理,系统性阐述了高光谱遥感影像分类中动态集成和静态集成算法的研究现状,并提出了有待进一步研究的问题。  相似文献   

1990年以来中国小麦农业气象灾害时空变化特征(英文)     

张朝  王品  陈一  张帅  陶福禄  刘晓菲 《地理学报(英文版)》2014,24(3):387-396

Agro-meteorological disasters(AMD) have become more frequent with climate warming. In this study, the temporal and spatial changes in the occurrence frequency of major meteorological disasters on wheat production were firstly explored by analyzing the observed records at national agro-meteorological stations(AMS) of China from 1991 to 2009. Furthermore, impact of climate change on AMD was discussed by comparing the warmer decade(2000–2009) with another decade(1991–2000). It was found that drought was the most frequent disaster during the last two decades, with a highest proportion of 79%. And the frequency of AMD increased significantly with climate change. Specifically, the main disasters occurred more frequently in the reproductive period than in the vegetative period. Besides, the spatial changes in the AMD frequency were characterized by region-specific. For example, the wheat cultivation areas located on the Loess Plateau and the middle-lower reaches of the Yellow River suffered mainly from drought. All these results were strongly linked to climate change in China. Therefore, sound adaptation options should be taken based on the latest changes of AMD under global warming to reduce agricultural damages.  相似文献   

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王乐洋  鲁铁定 《大地测量与地球动力学》2014,34(2):55-59

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准确把握工作定位开创国土资源工作新局面——2014年广西国土资源工作会议综述     

陶琦 《南方国土资源》2014,(3):15-16

2014年广西国土资源工作会议于2月17日以视频方式召开。此次视频会,主会场设在广西国土资源厅,广西地理信息测绘局及各市、县（区、市）国土资源局设分会场。广西国土资源厅领导肖建刚、梁兵、唐善茂、谢瑾瑜、田凤鸣、陈仲怀、张创智、祝林林、吴锡熹、李清洋、李水明、周兆东、唐解凤等出席会议。  相似文献   

基于RSEI的大熊猫国家公园生态环境评价     

颜科  刘瑞  杨远陶 《地理空间信息》2022,20(4):26-30,73

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甘肃礼县中川地区金矿成岩和成矿年龄的SHRIMP厘定   总被引：1，自引：0，他引：1       下载免费PDF全文

姜启明  鲁挑建 《地质科学》2014,49(4):1184-1200

甘肃省礼县中川地区属于礼（县）岷（县）金矿带的东段,成矿作用与中川花岗杂岩体有密切的关系。运用高分辨率和高灵敏度离子探针（SHRIMP）测试技术,获得了中川花岗杂岩体形成的精确年龄,主侵入时代为210～160 Ma（可信度95%,MSWD=1.4）,该花岗岩体属于燕山早期-印支期造山运动的产物;3颗锆石（4个测点）的SHRIMP测试结果表明,中川地区金成矿的年龄为197～162 Ma,证实礼县中川地区金成矿于中川花岗岩体形成及稍后的时间段。年龄测试和地质剖面测量资料都证实,中川花岗岩体南部地层应该划在中石炭统地层中。与中川花岗杂岩体地质情况类似的碌础坝、 柏家庄、 闾井、 教场坝、 温泉等岩体外接触带仍然有很大的找矿前景。  相似文献   

安徽独山富硒区土壤硒元素迁移转化规律及开发研究     

陶春军  贾十军  邢润华 《江苏地质》2014,38(1):83-87

选取广德独山地区作为研究对象,利用安徽省富硒土壤分级标准,相对系统地研究独山地区农业可耕地土壤及其植物中的硒含量。研究表明:土壤中硒含量与有效硒、镉、铬、氮、钼、有机质等具有显著的正相关关系,土壤中磷、锰、pH值等含量或指标越高,硒的生物有效性越低。这些为独山地区富硒产品开发的定位提供了一定的理论依据,并对当地的富硒产品的开发提出了一系列的可行性建议。  相似文献