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。     

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。     

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。     

沈阳铁西区社区弹性特征与成因分析

基于问卷数据,运用统计分析、地理探测器,分析沈阳铁西区不同社区弹性差异、影响因素及其成因。研究发现：① 商品房社区社会弹性、制度弹性、社区资本分值高于单位社区;单位社区的经济弹性、物质弹性分值高于商品房社区。② 物质弹性、制度弹性对社区资本影响作用较为显著,社会弹性、经济弹性影响作用较小。③ 从制度转型、地方政府、经济发展、社区服务和社会与个人5方面探讨了沈阳铁西区社区弹性成因。沈阳铁西区在搬迁改造、产业转型等冲击下,城市更新过程表现出较强的适应能力和较弱的学习能力,这是社会弹性、经济弹性、制度弹性、物质弹性共同作用的结果。     

大连城市绿地可达性对房价影响的差异性分析

研究房价、遥感影像等多源数据,采用邻域分析法和地理加权回归模型分析大连市中山区绿地可达性及其与房价之间的空间相关性。结果表明：① 房价均价14 745.35元/m²,呈环状分布,由沿海向内陆衰减、桂林街道起中心向外围递减;② 研究区内可达性最好的绿地类型是街旁绿地,绿地可达性总体水平最高街道是桂林街道;公园绿地可达性最好的住宅区分布在昆明街道和桃源街道,街旁绿地可达性最好的住宅区分布在桂林街道,附属绿地可达性最好的分布在老虎滩街道,其他绿地可达性最好的分布在桃源街道。③ 不同类型绿地可达性对房价影响作用程度递减排序为：附属绿地、街旁绿地、公园绿地和其他绿地;附属绿地、街旁绿地和其他绿地与房价呈现空间正相关,随着到达绿地距离降低,房价呈现增长趋势;公园绿地与房价呈现负相关,随着到达公园绿地的距离降低,房价呈现衰减趋势。     

Waterpoint management system in central district with ArcView GIS

1StudyAreaCentralDistrictisthelargestdialectinBotSWana.Itcoversanareaof146531kin',whichisroughlyonequarterofBotswana.ThedistrictborderstheRepublicofSouthcocainthesouthandeast,andZimbabweinthenorth-east.ItalsobordersNorthEastDistricttotheeast.ThenorthernboundalofthedistrictissharedfaiththeChobeDistrictandNgdrilandDistrict.Inthet"estandthesouth-u'estaledistrictbordersNgndland.Ghanzi.KwenengandKgahengDistrictS.ThedistlictisdiyridedintofiveadlnjnistrahvesubdistrictsfBobirwa.Serowemalapy…