对澳大利亚南极地带安德拜极地早前寒武系的地壳演化和地质年龄评论

安德拜(Enderby)极地的早期前寒武系克拉通(纳皮尔杂岩),如同其他太古宙克拉通一样,也被较年轻的活动带包围。但是它与众所熟知的花岗岩—绿岩克拉通被高级麻粒岩相片麻岩包围为特征的区域情况不同。安德拜极地克拉通的热力构造特征和复杂类型与编录良好的西格陵兰太古宙地层具有明显的相似性。在安德拜极地,发育良好的水平层理和平行强烈压扁及伸长的LS组构是称之为伏     

The Effect of Temperature on Growth and Energy Budget of the Polychaete,Neanthes japonica Izuka

Growth and energy budget of the polychaete, Neanthesjaponica, at various temperatures (17, 20, 23, 26 and 29 ℃) were investigated in this study. The growth, as indicated by final dry weight and specific growth rate (SGR), increased with increasing temperature, with the maximum level at 26℃, and then decreased significantly at 29℃. A similar trend was observed in feeding rate, food conversion efficiency (FCE) and apparent digestive rate (ADR). However, no significant differences were detected in ADR among all the temperature treatments. In the pattern of energy allocation, faeces energy was only a small component of energy budget and had little influence on the proportion of food energy allocated to growth. The metabolic energy accounted for a large portion of energy intake for each temperature treatment. The nitrogen excretion was appreciable with changing temperature. The two expendi-ture terms (respiration energy and excretion energy) in energy budget were the major factors influencing the proportion of food en-ergy allocated to growth. These results revealed that temperature affected the growth of N. japonica mainly by influencing feeding rate and FCE. In addition, regression equations describing the relationship between feeding rate, faecal production, SGR, FCE and temperature were obtained. The optimum temperatures for feeding rate, FCE and SGR were estimated at 25.01 ℃, 24.24℃ and 24.73 ℃, respectively, from the regression equations.     

MapGIS下空间数据库的建立及其典型问题研究

以云南省地质图、水文地质图空间数据库的建立为例,通过对空间数据库建设中资料准备、图形矢量化、空间数据处理及文件转换四个过程的分析,总结了在进行回溯型空间数据库建库过程中需要注意的一些典型问题,并提出了解决的办法。论述了在MapGIS下空间数据库建立过程中的一些技巧及经验。     

中国西部山地发展的一般模式——以天山巴音布鲁克地区为例

中国西部山区是我国的水源地及生态屏障，它们的合理开发与保护是西部大开发的基本内容。研究归纳出山地发展的“巴音布鲁克模式”：（1）天鹅及其生境的绝对保护（核心）；（2）建立可持续牧业（主体）；（3）规范和发展旅游业（突破口）；（4）西蒙古土尔扈特传统文化的保护（文化多样性）。中国西部山区的发展模式都可以概括为一个核心（自然保护）三个圈层（与当地主要土地资源相适应的主导产业，与当地特有资源相联系的新兴产业，当地民族文化保护）。这种模式能够充分体现生态优先的思想，同时考虑到促进地区新老经济及文化的发展与保护，符合西部大开发的方针。     

THE EFFECT OF DRAINAGE ON CHEMICALELEMENTS CONTENT OF MARSH

I INTRODUCTIONWetland has very important effect on retainingwater and against drought, regUlating climate, controlling soil erosion and so on ac. Today men often attachimportance to economic effect of wetland reclamation,but neglect and destroy other functions and effectswhich result in blind wetland development, a lot ofwetland degeneration. The area of freshwater wetland inthe 1950s was 134 x 10'ha, but in the 1970s 70% hadchanged into farmland (MITSCH, 1993). The area ofwetland in d…     

AN OVERVIEW ON THE URBAN-RURAL INTERACTION IN THE PAST 50 YEARS IN CHINA

１ＩＮＴＲＯＤＵＣＴＩＯＮＢｙｄｅｆｉｎｉｔｉｏｎｕｒｂａｎｉｚａｔｉｏｎｉｓｔｈｅｐｒｏｃｅｓｓｏｆｒｕｒａｌａｒｅａｓｃｈａｎｇｉｎｇｉｎｔｏｕｒｂａｎａｒｅａｓｉｎｎａｔｕｒｅｆｏｒａｓｏｃｉ-ｅｔｙｉｔｉｓａｎａｔｕｒａｌｌｙｈｉｓｔｏｒｉｃａｌｐｒｏｃｅｓｓｏｆｔｈｅｔｒａｎｓｉｔｉｏｎｆｒｏｍａｔｒａｄｉｔｉｏｎａｌｒｕｒａｌｏｒａｇｒｉｃｕｌｔｕｒａｌｓｏｃｉｅｔｙｔｏａｍｏｄｅｒｎｉｚｅｄｕｒｂａｎｓｏｃｉｅｔｙＧＡＯ１９９１．Ｉｎｂｒｉｅｆｉｔｒｅｐｒｅｓｅｎｔｓａ…     

高能波控陆架的风暴沉积和风暴层序——以澳大利亚东南部陆架为例

根据浅层地震和钻孔资科,将澳大利亚东南部研究地区高能波控陆架风暴沉积分为直立风暴层、叠瓦状风暴层、无序风暴层、水平风暴层和纹层状风暴层等五类.各类风暴层及风暴层与非风暴层组合而成悬移风暴层序、悬移-推移混合风暴层序和推移风暴层序三大类.中陆架风暴沉积与现今近岸和水下岸坡相似,岩性、岩相和古生物属海岸带,风暴沉积厚,底板埋深大,组成物质粗.推断中陆架风暴沉积当形成于冰后期海侵、该地带处在近岸带和水下岸坡环境时,此时海面上升速度可能减缓,或趋近于零,甚至可能有短时间的下降.     

Release into the environment of metals by two vascular salt marsh plants

Metals in contaminated salt marshes are mainly locked in the anaerobic layer of sediments, where they are tightly bound as sulfides and organic complexes. Vascular plants survive in saturated soils in part by pumping O2 into their root zones, changing their microenvironment to an oxic one. This, along with chelating exudates, mobilizes metals, allowing uptake by the roots. We compared the common reed Phragmites australis and cordgrass Spartina alterniflora in lab and field studies for ways in which they handle trace metals. Both plants store most of their metal burden in their roots, but some is transported to aboveground tissues. Spartina leaves contain approximately 2-3 x more Cr, Pb, and Hg than Phragmites leaves, but equivalent Cu and Zn. Furthermore, Spartina leaves have salt glands, so leaf excretion of all metals is twice that of Phragmites. In-depth studies with Hg indicate that Hg excretion correlates with Na release but not with transpiration, which is 2.2 x higher in Phragmites; and that more Hg accumulates in early-appearing leaves than in upper (i.e. later) leaves in both species. Spartina thus makes more metals available to salt marsh ecosystems than Phragmites by direct excretion and via dead leaves which will enter the food web as detritus.     

STUDY ON BEIJING''''S EMERGING MOBILE COMMUNICATION INDUSTRIAL CLUSTER AND ITS POLICY IMPLICATIONS

1INTRODUCTIONClusters,definedasgeographicallyproximategroupsofinterconnectedcompaniesandassociatedinstitutionsinparticularfields,linkedbycommonalitiesandcomple-mentarities(PORTER,2000),havearousedanintenseinterestofurbanandregionalplanningresearchersandpolicymakersoverthepastdecades.Itiswidelyrecog-nizedthatclusterscanpromoteproductivityandinno-vation,developlocalcompetitiveadvantages.Popular-izedbyMichaelPORTERinhisbook“TheCompetitiveAdvantageofNationsin1990,theclusterisnotanewcon…     

用于环境地质填图的组合遥感图像——在西班牙CdGN自然公园的应用

西班牙的Cabo de Gata Nijar天然公园提供了某些使其具有重要地质生态和环境意义的独特特征。作为该公园环境和采矿活动（直到十几年前才停下来）产生影响研究的优先步骤,确定了矿山和废物遗弃场地的位置,对岩性作了鉴定。为了达到这个目的,采用了不同的遥感技术来建立高分辨率的图像文件,图像文件将成为该区地质和环境填图的根据：因为从前的采矿活动牵涉到当地的环境,所以特别注意这些区域。由于具有不同空间／频谱分辨率的遥感图像日益加大的可用性,因此它们已成为很有用的工具。上述的是SPOT全色和陆地卫星专题成像仪多频图像的情形,它们是地质和环境研究中最常使用的基于遥感的两种图像。在为数众多阐述组合遥感图像资料的技术中,本文利用SPOT全色和陆地卫星TM资料研究那些基于亮度一色相一彰度（饱和度）、主要成分分析、高通滤波器和颜色正规化的变换。该研究的目标是：分析和对比一些最常使用的方法;选择最适合用于详细地质．环境研究的方法;将该方法用于Cabo de Gata Nijar地区一国家最具特色的一个天然公园场地。