长白山区珍稀濒危植物毛毡杜鹃种群现状及保护

毛毡杜鹃(Rhododendron confertissimum)分布于长白山的亚高山地带,属长白山区珍稀特有种,观赏价值高.对毛毡杜鹃生长环境、土壤特点、伴生植物进行调查,分析其种群退化原因,指出物种入侵及游客破坏是导致种群衰退的主要原因.     

龙门山南段前陆冲断带内的古油气藏

通过对龙门山南段地表沥青发育特征及分布规律的研究,对比不同层位中流体充注特征,结合该地区构造演化史,证实了龙门山南段冲断带内曾经存在过古油(气)藏,重塑了古油(气)藏形成和破坏的过程。研究表明,沥青主要分布于观雾山组和灯影组次生溶孔、溶洞和裂缝中;以灯影组中沥青最为发育,侧向延伸稳定,垂向充填较厚,说明研究区曾存在过古油(气)藏。晚三叠世以前,来源于松潘-甘孜海盆的油藏流体,由西向东运移充注于现今前陆冲断带内的震旦系灯影组、泥盆系和二叠系储集空间中形成古油藏;晚三叠世盆山转换时期,古油藏随着前陆盆地的快速沉降而被深埋,油裂解成气而形成古气藏;随着冲断带向前陆盆地扩展,赋存于前陆盆地内的古气藏被破坏。     

天龙山植物群落优势种群生态位研究

对天龙山植被的17个优势种群生态位进行了研究，首先用TWINSPAN与传统群落的分析方法，把40个样方分为6个群落类型，用Levins和Shannon-wiener生态位宽度和Petraitis生态位特定重叠指数测定群落中优势种群生态位宽度和生态位重叠，并分析其生态学意义．结果表明，种群生态位宽度越大，对环境的适应能力就越强，对资源的利用能力也就越强；生态位重叠值越大，种群间的生态相似性越大，利用资源的相似性程度越高；生态位宽的种群对生态位窄的种群可能有较高的重叠值，反之则较低。     

一株高温菌所产酶的功能分析与菌株分类鉴定

从长白山温泉中分离出一株可产生淀粉降解酶的高温菌(CW₂), 用薄层层析法分析鉴定酶促淀粉降解的产物, 发现CW₂所产生的淀粉降解酶系胞外酶, 可催化淀粉降解产生异麦芽低聚糖(主要包括异麦芽糖、 异麦芽三糖和潘糖). 用PCR法扩增其16S rDNA, 测定其序列（873 bp）, 与GeneBank中已知菌的16S rDNA序列对 比, 该菌株与模式菌株Bacillus licheniformis ATCC 14580,Bacillus licheniformis  DSM 13,Bacillus subtilis strain JM4的16S rDNA序列同源性最高, 只分别相差9,9,13个碱基, 序列相似性分别为98.97％,98.97％,98.51％. 用Neighbor joining方法构建CW₂进化树, 并用Bootstraping法对其评估, 结果表明, CW₂与Bacillus licheniformis, Bacillus sonorensiss形成Bacillus属中的亲缘关系最近的一个进化种群.     

冀南太行山区野生保健饮料食品植物资源的研究

在冀南太行山区的植物资源中筛选出野生保健饮料食品植物１９种。较详细报道了其中９种重要资源植物的形态特点、利用价值及保健功能，其余种类作了列表介绍。文末对野生保健饮料食品植物资源的利用问题进行了讨论。     

中国大别山双子叶植物化石木材（Ⅰ）—樟科

描述了湖北省新州县大别山下（北纬３０°３１′；东径１１４°３５′）阳逻镇新近采到的一块木化石，其结构近似于现存樟科樟属植物。木化石的解剖学特征显示了大别山地区在第三纪时气候倾向更温暖湿润。     

陕西蓝田锡水洞哺乳动物群的意义

在分析了锡水洞化石哺乳动物群的性质及其所反映的古气候环境后，通过对该时期古人类分布及活动的推断，确定出该动物群的时代为中更新世，进而推算出了第四纪中期以来秦岭大约抬升了１１０ｍ。     

Zircon U-Pb SHRIMP ages of eclogites from the North Qilian Mountains in NW China and their tectonic implication

TheNorthQilianMountainsattheboundarybe-tweenGansuandQinghaiProvincesareafamousCaledo-nianplatesuturezoneinthenorthwesternChina.Thissuturezoneis80to100kmwideandextendsintheNWdirectionparalleltotheNorthQaidamUHPbeltinthesouth[1,2].Itconsistspredominantlyofophiolite,island-arccomplexandhigh-presuremetamorphicrocks[38],andshowstypicalfeaturesofPacific-type[9](orB-type)sub-ductionzone.Spatially,thehigh-pressurerockscanbesubdividedintohigh-gradeblueschistbeltandlow-gradeblueschistbelt[5,6].Th…     

The zircon SHRIMP chronology and trace element geochemistry of the Carboniferous volcanic rocks in western Tianshan Mountains

The genesis of the Carboniferous volcanic rocks in the Dahalajunshan group, mainly consisting of trachytes and trachy-andesites and distributing widely in western Tianshan Mountains, remains to be controversial. It has been proposed to be relevant to “rift” or “plume”. Detailed petrology and geochemical data presented in this paper show that these volcanic rocks represent typical continental arc magmatism. The volcanic rocks are mainly trachy-andesitic, and the magma source is enriched in LILE, Th and Pb, and depleted in HFSE and Ce. Trace element geochemical study suggests that the basalts could be modeled by 7% -11% partial melt of garnet Iherzolite. The volcanic rocks in the Dahalajunshan group are neither the products of “rift” nor so-called “plume”but represent the continental island arc of the Paleo-Southern Tianshan Ocean. The mantle wedge had been modified by the melt generating in subduction zone during a long evolution history of this island arc. The continental crust materials （i.e. mainly sediment on ocean floor） had been added into island arc through melt in subduction zone. Volcanic rocks occurring in different regions might represent magma eruption in different time. The zircon SHRIMP dating indicates that the ages of the basalt varies between 334.0 Ma and 394.9 Ma. The 13 analyses give an average age of 353.7±4.5 Ma （MSWD = 1.7）. The apparent ages of zircons in trachy-andesite vary between 293.0 Ma and 465.4 Ma. All analyses fall on the U-Pb concordant line and are divided into two groups. 8 analyses produce an average age of 312.8±4.2 Ma （MSWD = 1.7）, which represents the crystallizing age of zircon rims in trachy-andesite. The acquired two ages （i.e. 354 and 313 Ma） belong to the Early Carboniferous and Late Carboniferous epochs, respectively. Thus, the Dahalajunshan group would be separated into several groups with the accumulation of high-quality age dating and data of trace element and isotopic geochemistry, in our opinion.     

青藏高原东南缘四姑娘山地区末次冰期砾石沉积和冰楔特征

四姑娘山位于青藏高原东南缘,第四纪冰川可分为3期.末次冰期时长坪沟口属于冰缘地带,在前次冰期冰碛物上发育了冰楔构造,冰缘地带冰川融水形成黑色细砾堆积.根据新的证据,末次冰期时四姑娘山长坪沟口附近年平均气温比现在低14～20℃.末次冰川作用发生时恰好也是四姑娘山地区强烈抬升的时期,因此,这套粗碎屑堆积可能是推覆构造的沉积响应,表明末次冰期时可能存在气候与构造联动作用.四姑娘山地区末次冰川规模较倒数第二次冰期明显偏小.