兰州--民和盆地首次发现白垩纪恐龙足印化石     

其和日格  于庆文 《地质通报》1999,18(2)

兰州—民和盆地是我国西北地区的一个较大的中新生代盆地,广泛分布着巨厚的白垩纪—第三纪河湖相地层。其中,第三纪地层中的生物化石十分丰富,而白垩纪地层中十分稀少,除微体化石外,未发现任何具有地层意义的宏观生物化石。从而影响对该地区中生代生物演化、地层划分...  相似文献   

关于区调工作几个问题的思考     

程裕淇  其和日格 《中国地质》1996,(1):11-12

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查明不同岩溶危险区的三维工程地震勘探的基本方法     

波格.  MC  刘吉成 《国土资源信息化》1994,(1):31-33

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全球水量交换的变化     

P.K.克利格  马瑞俊 《地理科学进展》1985,4(3):25-30

近年来所进行的研究表明,全球水量交换经受了相当大波动。自上世纪以来,气候呈现明显变暖,並于本世纪30—40年代达到最高值,变暧将近1℃。然后,到60年代中期,气温出现某些下降,此后气温又略转升高。  相似文献   

内蒙古西山湾羊场火山岩型银多金属矿床地化异常特征及控矿因素   总被引：2，自引：0，他引：2  

康明  马祖飞  刘琛  斯琴毕力格 《矿物岩石地球化学通报》2014,(1):77-81

通过1∶5万水系沉积物测量,获得Ag、W、As、Au、Sb、Pb、Bi、Mo、Zn、Cu、Hg等多元素组合异常,这些异常具有明显的浓度分带和组分分带。运用岩石地球化学测量方法进行异常查证,进一步获得Ag、Au、As、Sb、W、Mo等多元素套合较好的岩石地球化学异常。通过地表槽探工程揭露,圈定出具一定规模的矿化体。深部钻探工程验证确定银多金属矿体的存在。矿体主要产于硅化较强的流纹岩、流纹斑岩、流纹质角砾岩中,以及火山岩与花岗岩的接触带部位,矿床受断裂构造控制明显,赋矿围岩为下白垩统白女羊盘组(K1bn)酸性火山岩。  相似文献   

兰州—民和盆地首次发现白垩纪恐龙足印化石     

其和日格  于庆文 《中国区域地质》1999,18(2):223-223

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The origin of the suspended particulate matter in the seagrass meadow of tropical waters, an evidence of the stable isotope signatures     

WAHYUDI A''an Johan  AFDAL null 《海洋学报(英文版)》2019,38(1):136-143

Suspended particulate matter (SPM) has been known as an important variable in the organic matter flow of coastal ecosystem. Half of burial carbon in seagrass meadows is contributed by allochthonous sources that compose the SPM such as phytoplankton, seagrass detritus, marine snow aggregates and terrestrially derived particles. Each composition of the SPM contributes different roles and is important to be identified, for instance, the exact contribution of seagrass detritus will be useful for determination of carbon export through the detritus form in seagrass meadows. Here, the SPM of seagrass meadows is studied in Bintan Island and the Selayar Archipelago. The aim of this research is to determine the source origin of the SPM using a stable isotope signature. In order to fulfill this aim, the objectives are defined as: (1) to specify the stable isotope signature (δ¹³C and δ¹⁵N) of the SPM, and (2) to determine the proportional distribution of the SPM''s prospectus sources. The result shows that the possibility of the source origin of the SPM includes a seagrass fraction (Enhalus acoroides and Thalassia hemprichii), terrestrial C4 plant, macroalgae, and terrestrial C3 plant. The SPM lies between the marine- and terrigenous-end members. However, it seems that the SPM is more to be terrigenous-end and allochthonous. According to a Bayesian mixing model, the terrestrial C4 has the highest contribution of the SPM at all sites except Barugaia and Pasi Island in Selayar (i.e., the highest contribution of the SPM is from the detritus of E. acoroides). The second contribution has been contributed by either seagrass detritus (E. acoroides or Th. hemprichii) or terrestrial C3 plant. The finding of this study indicates that there is a strong influence of the terrigenous sources in the SPM of the seagrass meadows.  相似文献   

Assessing temporal variation of coloured dissolved organic matter in the coastal waters of South Eastern Arabian Sea     

Minu P  Souda V P  Baliarsingh S K  Dwivedi R M  Y Ali null  Ashraf P M 《海洋学报(英文版)》2020,39(1):102-109

Coloured dissolved organic matter （CDOM） plays a major role in marine photochemical and biological processes and its optical properties are known to affect the underwater light penetration. This paper highlights in situ optical estimation and satellite retrieval of CDOM in deciphering its temporal variations in coastal waters of the South Eastern Arabian Sea. The study accentuated the source of CDOM as terrigenous origin during monsoon， of in situ productions during pre-monsoon and during post-monsoon of autochthonous-allocthonous origin. The matchup analysis for in situ and MODIS Aqua retrieved A_dg443 exhibited bias which decreased by incorporating the seasonal component. The study also identified degrading bloom of Noctiluca scintillans as the source for exceptionally high CDOM in the area during January and February. The study demands to incorporate seasonal components and phytoplankton abundance while assessing the performance of CDOM algorithms in optically complex coastal waters.  相似文献   

浑善达克沙地天然沙地榆种内竞争研究     

昭日格  李钢铁  岳永杰  邹受益 《中国沙漠》2011,31(2):451-455

采用逐步扩大范围的方法确定影响沙地榆对象木的最佳竞争范围,利用Hegyi提出的单木竞争指数模型,对浑善达克沙地天然沙地榆种内竞争强度进行定量分析。结果表明,在沙地榆群落中,对象木的最佳竞争距离为8 m,沙地榆种内竞争强度随着植株径级的增大而逐渐减小。竞争强度与对象木胸径服从幂函数关系,从模型预测结果可知,当沙地榆胸径在30 cm以内时,竞争强度变化显著;当沙地榆胸径达30 cm 以上时,竞争强度变化很小。采用逐步扩大范围的方法能有效地确定竞争木范围,较好地反应浑善达克沙地天然沙地榆种内竞争关系。应在沙地榆胸径达30 cm前采取适当的人工疏伐措施来促进植株生长和增强生态系统的稳定性。  相似文献   

多年生人工草地对沙质土壤呼吸作用的影响   总被引：2，自引：2，他引：0  

套格图  赵吉  孙启忠 《中国沙漠》2008,28(2):301-305

 在鄂尔多斯沙地改良试验站的撂荒地和退耕地,测定和分析了多年生人工草地对土壤呼吸速率的影响。结果表明,撂荒地上建植人工草地后土壤呼吸速率明显增高,人工建植草地土壤呼吸速率与撂荒地的土壤呼吸速率差异达到极显著水平(P<0.01);建植于退耕地上的无芒雀麦草地的土壤呼吸速率略高于玉米地土壤呼吸速率。撂荒地和退耕地上建植的无芒雀麦草地土壤呼吸速率高于冰草草地土壤呼吸速率。而施有机肥会提高人工草地的土壤呼吸。  相似文献