Pearce型构造岩浆地球化学判别图评述——以玄武岩为例

自从六十年代板块构造的概念诞生以来,人们认识到有必要探讨古地理和古构造重建的方法.一段时期以来,很多学者(如Gilluly,1971)认为,岩浆作用与特定的大地构造环境紧密相关,不同的岩浆类型或火山岩系列产在一定的地壳环境,因而出现了许多运用主要或微量元素资料的分类体系或判别图.基于Irvine和Barager(1971)以及Miyashiro(1973)发表的主要元素图解能用来判别岩浆类型,而Pearce(1976)则介绍     

基于生态功能考虑的西北干旱地区生态需水研究

在当前生态需水研究的基础上,选取植被盖度作为衡量绿洲生态功能的主要指标,根据植被盖度和侵蚀率之间的关系,从生态系统的需水机理出发,提出了基于生态功能考虑的西北干旱地区生态需水量计算方法.以额济纳绿洲为例,计算了2000年额济纳绿洲生态需水,并与额济纳绿洲不同时期的生态需水进行了对比分析.     

Quantitative structure - activity study on the reductivedehalogenation potency of the halogenated aromatics

Ｑｕａｎｔｉｔａｔｉｖｅｓｔｒｕｃｔｕｒｅ－ａｃｔｉｖｉｔｙｓｔｕｄｙｏｎｔｈｅｒｅｄｕｃｔｉｖｅｄｅｈａｌｏｇｅｎａｔｉｏｎｐｏｔｅｎｃｙｏｆｔｈｅｈａｌｏｇｅｎａｔｅｄａｒｏｍａｔｉｃｓＨｕａｎｇＱｉｎｇｇｕｏ；ＷａｎｇＬｉａｎｓｈｅｎｇ；Ｈａｎ...     

PFU微型生物群落水质鉴别及群落参数变化模式的研究

基于ＰＦＵ微型生物群落参数调查数据，对湖北省汉江两条污染带１１个站 和湖南常德市水系１５个站点所属水质组别进行了综合分析研究。所得典型鉴别函数能够对水质组别作出有效的鉴别，分类函数对站点的水质组别分类正确率达到９６％；群落参数对化学综合污染指数的响应不呈简单的线性关系，群落的变化存在一定模式。     

淮河中游地区水环境功能区划研究

从地表水质现状出发，寻求有利经济结构调整、重大区域开发规划布局与水质目标管理的科学水环境功能区划方案，为实施水污染物排放总量控制，改善地表水质提供技术支持。     

云贵高原湖区湖泊营养物生态分区技术方法研究

提出一种基于主成分分析、聚类分析、判别分析和空间自相关的分区模型,用于对云贵高原湖区湖泊营养物生态分区的研究.首先运用主成分分析方法对众多指标进行了降维综合处理,产生彼此互补相关又能综合反映湖区情况的4个新指标,累计贡献率达到93.69%,具有充分的代表性,构建了云贵高原湖区湖泊营养物生态分区指标体系.在此基础上,根据各区域新指标值,结合聚类模型初步将湖泊流域分为5类,再利用判别分析完成非湖泊流域的类别判别,最后运用空间自相关分析方法,按聚类结果进行全局自相关分析,Moran’sI为0.320,且检验值Z值为68.2,远大于临界值(显著水平1%所对应的临界值2.58),表明聚类结果与空间位置具有显著相关性,之后运用局部自相关对区域各因素的主成分综合得分的空间分布格局进行了量化分析,揭示了零散分类区块在空间地域分布上的关联和差异,根据关联结果完成最终的分区.结果表明,利用此分区模型可以尽量避免人为因素,得到更为客观的分区结果,具有良好的适应性和可行性,可为探索适合我国湖泊营养物生态分区的指标体系和分区技术方法,完成全国湖泊营养物生态分区和科学地制定我国湖泊营养物基准和富营养化控制标准提供技术支持.     

Water Quality during Development and Apportionment of Pollution from Rivers in Tapeng Lagoon, Taiwan

This work investigated water samples collected from Tapeng Lagoon, Taiwan. Factor analysis was conducted to explain the characteristics and the variation in the quality of water during the disassembly of oyster frames and fishery boxes. The result shows that the most important latent factors in Tapeng Lagoon are the ocean factor, primary productivity factor, and the fishery pollution factor. Canonical discriminant analysis is applied to identify the source of pollution in neighboring rivers outside Tapeng Lagoon. The two constructed discriminant functions (CDFs) showed markedly contribution to all discriminant variables, and that total nitrogen, algae, dissolved oxygen and total phosphate, combined in the nutrient effect factor. The recognition capacities in these two CDFs were 95.6%, 4.4%, respectively. The water quality in the Kaoping river most strongly determined that in the Tapeng Lagoon the best is. And disassembling the oyster frames and fishery boxes improves the water quality markedly. However, environmental topographic conditions indicate that strengthening stream pollution prevention and to constructing another entrance to the ocean are the best approaches for improving the quality of water in Tapeng Lagoon, especially by reducing eutrophication. These approaches and results yield useful information concerning habitat recovery and water resource management.     

汉江堵河流域地表水质时空变化特征

对汉江堵河流域9个点位为期1年的地表水水质理化特性进行时空特征分析,应用〖WTBX〗t〖WTBZ〗检验进行水质季节性变化分析,聚类分析进行空间相似性分析以确定空间尺度的分类情况,判别分析识别显著性指标,并以此反映上述空间聚类分析结果的差异性。结果表明:①Cl-、总溶解性固体（TDS）及浊度（Turbidity） 3项指标没有表现出显著的时间差异性;②温度、pH、NO-3、TP表现为丰水季显著大于枯水季,而SO2-4、HCO-3、NH+4、 DO则表现出相反的变化趋势,即枯水季显著大于丰水季;③空间聚类分析将采样点分为4类;④判别分析体现出良好的指标降维能力,仅需4个指标（NO-3、TDS、SO2-4、HCO-3）即可反映整体水质的空间差异性。     

Ecogenetic features and functions of solods in transural forest-steppes (within Sverdlovsk Oblast)

Specific ecogenetic features of solods in the forest-steppe zone has been studied, and the role of biotic and abiotic factors of soil formation has been estimated. Differentiation of soil horizons with respect to the physical clay fraction accounts for specific features of their moistening, which is reflected in the ratio of strongly and weakly crystallized forms of iron. Periodic changes in redox conditions results in iron segregation, and a high content of fulvic acids accounts for its eluvial migration. These processes are controlled by soil geochemical barriers.