Distribution of Arsenic in Sewage Irrigation Area of Pearl River Delta,China     

黄冠星  孙继朝  张英  荆继红  张玉玺  刘景涛 《中国地质大学学报(英文版)》2011,(3)

The aim of the present work is to investigate the distribution of arsenic(As) in sewage ir-rigation area,to deduce the migration and transformation mechanism of As in soil and groundwater,and to infer the source of As in soil and groundwater.This study is carried out in a sewage irrigation area of the Pearl River Delta,China.Surface water samples,soil samples,and groundwater samples from sewage irrigation area were analyzed for As and other elements.As contents in water samples were analyzed by hydride gene...  相似文献   

河岸带潜流层动态过程与生态修复   总被引：5，自引：0，他引：5       下载免费PDF全文

夏继红  陈永明  王为木  韩玉玲  刘海洋  胡玲 《水科学进展》2013,24(4):589-597

河岸带潜流层是河岸带内地表水与地下水相互作用的生态交错带,在水文地理学、生态学、环境学上含义不尽相同。河岸带潜流层具有复杂的垂向、横向、纵向结构特征,其边缘效应显著,表现为泥沙、水流、生物、环境化学因子之间的复杂动态过程,主要包括水动力动态过程、生态学过程、溶质循环与化学过程等。水动力动态过程是驱动条件,氧气浓度是生态过程、溶质循环和化学过程的决定性因素。在各动态过程的驱动下,河岸带潜流层具有调蓄洪水、削减污染、净化缓冲环境和提供适宜栖息地等功能。针对河岸带潜流层功能退化的问题,需开展健康诊断,明确致病机理,实施适宜的生态修复。未来中国在开展河岸带潜流层研究时,应根据中国河岸带特点,采用示踪试验、数值模拟等方法,集成GIS等现代技术手段,研究多尺度下,水文条件、地形变化、土壤渗透系数、河岸带建设方式、植被分布等对河岸带潜流层水文、热传导、生化、生态等的影响机制,准确界定河岸带潜流层区域范围,制定适宜的生态修复策略。  相似文献   

我国科学数据共享现状的调查     

路鹏  苗良田  莫纪宏  李志雄  李学良  孙仕宏  王松 《国际地震动态》2008,(9)

本文是科学数据共享政策法规体系研究系列文章的收笔之作.撰写本文的目的,就是为说明科学数据共享政策法规体系的研究是建立在大量的基础调研之上.调查研究是谋事之基、成事之道.从实践中寻求解决现实问题的方法,才能制定出切实可行的政策、法规,调查研究是制定政策、法规的客观依据.为使制订政策、 规章制度适应社会经济发展和变化的新情况,就深入开展调查研究,认真听取各方面的意见,深入研究相应的管理规律和运行机制.本文详述了调查过程、调查方法,以佐证政策法规研究不能脱离实际.  相似文献   

GPS网起始数据的误差分析   总被引：1，自引：0，他引：1  

邢继红 《地理空间信息》2006,4(4):13-15

应用5种GPS控制网起算点坐标误差的分析方法,分析了某地铁二号线西延伸线工程GPS控制网的起算点坐标误差,成功地剔除了误差超限的起算点。  相似文献   

青城子小佟家堡子、林家金矿成矿流体特征及成矿机制     

代军治王可勇  杨言辰李基宏 《地质论评》2006,52(6):836-842

小佟家堡子、林家金矿是青城子铅锌、金、银矿集区的中-大型金矿床,金矿床与沉积-变质期硅化岩关系密切。通过与矿区尖山岩体、新岭岩体中流体包裹体对比研究表明,金矿床与尖山岩体中主要发育水溶液包裹体,极少量的CO2包裹体、含CO2三相包裹体,而新岭岩体除发育以上包裹体外,还发育含子矿物多相包裹体。测温结果显示金矿床成矿流体温度为110～335℃,盐度3．9％～16．2％NaClrq拉曼光谱分析表明金矿床流体成分以H2O为主,少量的CO2、CH4等气体,表明成矿流体属NaCl-H2O体系。金矿床与尖山岩体中流体包裹体温度、盐度及成分相近,推断成矿流体主要来自沉积-变质期。  相似文献   

面向地理信息大数据的时空事件关系可视化分析框架     

李金磊  慈谕瑶  郑坤  郭绍龙  燕继红  陈宇萍  吴艳民  李仕漪 《测绘通报》2019,(12):101-104

不同类型的地理信息大数据蕴含了丰富的时空关系，反映个体或者群体时空事件之间的变化模式，在资源、环境、交通等领域的智慧应用中起到关键性作用。然而，地理信息大数据拥有的多尺度和多语义特性，在挖掘地理信息大数据的时空关系时会存在许多困难。如何有效地构建多尺度多语义时空关系，并直观地表达这些时空关系是一个重大挑战。本文设计了一种时空事件关系可视化分析框架，通过定义事件间时空关系的描述，设计了一种多视图协同的可视化分析方法，结合时空关系的可视化协同交互，实现地理信息大数据时空事件可视分析。基于时空轨迹数据，通过试验说明该方法可以探寻时空事件及背景间的时空关系，实现时空事件的交互可视分析。  相似文献   

Temporal variation in biodeposit organic content and sinking velocity in long-line shellfish culture     

任黎华  张继红 《中国海洋湖沼学报》2016,34(5):985-991

We measured the organic content and sinking velocities of biodeposits from two scallop species (Chlamys farreri, Patinopecten yessoensis) and abalone (Haliotis discus hannai) that were cultured on suspended long-lines. Measurements were conducted every two months from April 2010 to February 2011. The shellfish were divided into three size groups (small, middle, and big sizes). At each sample point, we assessed biodeposit organic content, average sinking velocity, the frequency distribution of sinking velocities, and the correlation between organic content and sinking velocity. The organic content of biodeposits varied significantly among months (P<0.05) and the pattern of change varied among species. Sinking velocities varied significantly, ranging from <0.5 cm/s to >1.9 cm/s. The sinking velocities of biodeposits from C. farreri and P. yessoensis were 0.5–1.5 cm/s and from H. discus hannai were <0.7 cm/s. The organic content was significantly negatively correlated to the sinking velocity of biodeposits in C. farreri (P<0.001) and P. yessoensis (P<0.05).  相似文献   

雄安新区某金属冶炼区土壤重金属污染程度及风险评价          下载免费PDF全文

王昌宇  张素荣  刘继红  邢怡  李名则  刘庆学 《中国地质》2021,48(6):1697-1709

为支撑雄安新区土地资源科学管理,完善中国土壤污染评价体系,文章以雄安新区某废旧金属冶炼区为研究区开展地质调查,采集541件表层土壤样品,测定了土壤中的Cd、Hg、Pb、As、Cu、Zn、Cr、Ni八种重金属元素的含量和pH,采用主成分分析法研究重金属元素的组合及分布特征,通过单因子指数法、内梅罗综合指数法、地质累积指数法、潜在生态风险评价法和人体健康风险评价法对土壤重金属的污染程度及风险进行评价。结果显示：研究区土壤中Cu、Zn、Cd、Pb元素超标主要受冶炼活动影响,As、Hg元素高值异常主要由受唐河污染的地下水灌溉引起;单因子污染指数超标比例大小顺序为Cd>As>Cu>Zn>Pb>Hg>Cr=Ni;内梅罗综合指数评价结果显示54%的样品达到了污染水平;地质累积指数超标比例大小为Cd>Cu>Pb>As>Zn>Hg>Ni>Cr,Cu、Cd、Zn、Pb、As极重污染比例分别为13.5%、10.2%、9.1%、10.9%、17.2%;Cd和Hg是主要的生态危害元素,Cd中等-强生态危害比例为65.2%,Hg中等-强生态危害比例为71.3%;非致癌风险因子主要为As、Cr、Pb,95.2%样品对儿童的非致癌风险超过了1,29件样品中As对儿童的致癌风险超过10^-4,研究区土壤重金属对儿童具有较高的健康风险。  相似文献   

Tolerance,oxygen consumption and ammonia excretion of Ophiopholis sarsii vadicola in different temperatures and salinities     

Fang  Jinghui  Zhang  Jihong  Jiang  Zengjie  Zhao  Xuewei  Jiang  Xu  Du  Meirong  Gao  Yaping  Fang  Jianguang 《中国海洋大学学报(英文版)》2015,14(3):549-556

There are more than 2000 species of brittle stars in the world. For most of them, many scientific questions including basic characteristics of eco-physiology are still unknown. In the present study, Ophiopholis sarsii vadicola acclimated at 15℃, salinity 31, were assessed for temperature and salinity tolerance. Its oxygen consumption and ammonia excretion were studied at different temperatures(5, 10, 15, 20, 25℃) and salinities(25, 30, 35). O. sarsii vadicola could tolerate 0–24℃ and no brittle star was dead in the salinity range of 19–48 in the experimental situation. Two-way ANOVA showed that the oxygen consumption and ammonia excretion normalized with both dry mass and wet mass, Q10, which is used to describe the temperature sensitivity of respiration, and moisture content were significantly affected by temperature and salinity, and the combined effects of the two factors were significant. Stepwise multiple regression analysis revealed that logarithmic oxygen consumption and ammonia excretion showed a significant positive relationship with logarithmic temperature and salinity. The logarithmic moisture content of the brittle stars showed an inverse relationship with logarithmic salinity, but a positive relationship with logarithmic temperature. This suggests that the tolerance of temperature and salinity of brittle stars is closely related to their living environment, and that the effects of temperature on oxygen consumption are more significant at higher salinity, and that the ammonia excretion is less affected by salinity at lower temperatures.  相似文献   

冰雹云雷达识别方法及防雹作业经验   总被引：7，自引：4，他引：3  

周德平  杨洋  王吉宏  宫福久  李子华 《气象科技》2007,35(2):258-263

总结了辽宁省40余年人工防雹工作积累的成果和经验,归纳了3种类型冰雹云的雷达回波特征以及利用回波形态、回波参量和综合指标对其进行雷达识别的方法,并结合冰雹云数值模拟结果,总结了对具有液态水累积区的雹云、对超级单体冰雹云和对多单体冰雹云实施人工防雹作业的一些经验,对于各地的科学防雹作业具有参考作用。  相似文献