Environmental investigation for causality and remediation of cadmium contaminated soils in Tak Province, Thailand

Highly elevated cadmium concentrations in paddy soil in the Mae Sod District, Tak Province, Thailand, was detected and widely reported in 2003. This emergence provoked public interest and demands for responsibility and remedial actions. As zinc mines and concentrator were located in the upstream area, mining activities were proclaimed a contamination source. Department of Primary Industries and Mines （DPIM）, a governmental organization responsible for mining and mineral processing, was thus challenged to verify the reliability of post monitoring data displaying consistently low heavy metal concentrations in compliance with the standard limits for over 15 years. Detailed survey and deep-going research on the causes, boundary and severity of cadmium contamination as well as the environmental impact alleviation were consequently conducted. Environmental samples were accumulated systematically for 2 years throughout the areas of upstream and downstream mining sites. A total of 259 soil samples from 53 spots at the depths of 0-20, 20-40, 40-60 and 60-200 cm were drilled with hand auger. Samples of water, stream sediment and mine tailing were also collected. Chemical analysis for cadmium （Cd）, zinc （Zn） and lead （Pb） concentrations with AAS and ICP were undertaken. The contaminated area was finally defined to spread over approximately 18 square kilometer mainly of mountainous mineralizing land and colluvium.     

天津市武清区地热资源分布特征与开发利用

武清区分布有丰富的地下热水资源,热储层具有双层结构,成因类型为传导型,热水矿化度低,赋存深度大多在可及深度范围之内,为热水资源的多重开发和利用提供了有利条件,在供暖、医疗、饮用、养殖等方面都具有良好的开发利用前景。     

南沙群岛珊瑚礁区仙掌藻的现代沉积特征

仙掌藻为温暖水体中钙化的绿藻,是南沙群岛珊瑚礁区重要的钙质沉积物源。对南沙群岛８座环礁现代沉积物样品的分析表明,仙掌藻碎屑在环礁各地貌沉积带沉积物中的含量,以泻湖盆底最高,平均为32.66％,最高可达75％,泻湖坡次之,平均9.22％,礁坪含量低,平均6.06％。南沙群岛仙掌藻以砂质基底上生长的直立类型为主,能生长于各个地貌沉积带,最适生态环境为封闭性好、泻湖面积大、水深较大（10～25m）、水动力弱的砂质泻湖盆底。仙掌藻的现代沉积特征反映了其生态特征,可作为中新世以来珊瑚礁沉积相划分的依据。     

神府东胜矿区煤中微量元素初步研究

采用神府东胜矿区廷安组５个可采煤层７３２个煤心煤样,应用光谱、原子荧光、原子吸收等分析方法,测定了煤中２３种微量元素。阐述了微量元素在煤中的含量分布和微量元素相对于地壳丰的富集系数,并对有害元素有用元素进行了初步评价。     

南沙群岛自然区划

本文综述了自然区划的一般原则和方法，以南沙群岛为例，论述了海陆兼备的区域自然区划，但这里存在深海区的垂直带谱问题。文中提出了南沙群岛地区自然区划方案，同中国科学院的全国自然区划的五级方案衔接，在三级区域下划分２个四级区域，再细分４个五级区域。     

Paleolimnological analysis of Ullswater using testate amoebae

Tests of testate amoebae extracted from samples of bottom sediments from 33 tarns in the English Lake District reveal a relationship between their distribution and physical-chemical parameters of the tarn waters.Nebela and several species ofDifflugia appear to prefer more acidic conditions, i.e., pH less than 6.2, while others such asCentropyxis, Lesquereusia and some species ofCyclopyxis andDifflugia are more common in lakes with pH's above that value.Using these data, and inferring rates of sedimentation from the densities of tests found in a 6-m core, a paleolimnological history for the past 11 000 years is presented for Ullswater (English Lake District). The record of testate amoebae, beginning shortly after deglaciation, depicts an uneven increase in acidity and a history of episodes of rapid and slow deposition that correlate reasonably well with paleoclimatological changes and anthropogenic alterations in the catchment.     

新世纪的广州市中心商务区建设

中心商务区的建设是城市经济水平的折影。中心商务区的3个发展演化阶段：前现代主义的中心商务区、现代主义的中心商务区、后现代主义的中心商务区。从发展战略角度出发，广州市以珠江新城为中心的中心商务区应致力于后现代主义的中心商务区建设，与传统中心商务区形成系列化、互补协调的中心商务区系统。根据广州市建设后现代主义中心商务区的条件并参照国内外中心商务区建设的经验，广州以珠江新城为中心的中心商务区建设应在增强自身吸引力的同时，导入后现代主义开发意识，以适合新世纪新经济、新文化等新形势的发展需要。     

Diversity of Plant Resources in Qunli National Urban Wetland Park in Harbin,China

Wetland parks play various ecological roles, including maintaining regional ecological balance, and connoting and compensating water sources. Taking Harbin Qunli National Urban Wetland Park as the research object, the diversity of plant resources in wetland parks is investigated and analyzed with the goal of providing a scientific basis for ecological restoration and the conservation and utilization of urban wetlands. Field survey, sampling and data collection methods were used to study the wetland plant resources and their life types (e.g., vines or shrubs), ecological types and distribution types. The study found 60 families, 129 genera and 160 species of wetland plants in Qunli National Urban Wetland Park, including 56 families, 123 genera and 151 species of angiosperms, which include 48 families, 101 genera and 127 species of dicotyledons and 8 families, 22 genera and 24 species of monocotyledons; 2 families, 2 genera and 3 species of ferns; and 2 families, 4 genera and 6 species of gymnosperms. The family composition is dominated by those families that included 10 or more species, and the dominant families are Compositae and Rosaceae. The genus composition is dominated by genera with four or more species present, and the dominant genera are Acer, Malus and Artemisia. Among the six life types, herbaceous plants are dominant, with a proportion of 62.50% of the species. The ecological types are divided into three categories: wet, mesophytic and aquatic plants, with wet plants accounting for the largest proportion, i.e., 56.25% of the total number of plant species. There are five distribution types of plant families and 10 types of the genera, with both families and genera dominated by the Northern Temperate types, so the flora has obvious temperate characteristics.     

基于熵权物元模型的土地生态安全评价——重庆市江津区实证

土地生态安全评价是区域生态文明建设以及维护区域生态安全与社会经济可持续发展的基础工作,近年来受到广泛关注。通过构建基于熵权物元模型的土地生态安全评价体系,并以重庆市江津区为案例开展实证研究。结果表明：（1） 江津区土地生态安全形式总体好转,但土地生态安全整体情况较差,还需要进行大力整治。（2） 江津区各乡镇土地生态安全等级具有明显的区域差异性。（3） 重点对土地生态安全状况差的区域进行整改,土地生态安全高的区域需继续保持生态优先的政策导向是下一步政府工作的重点。