太湖沉积物中的可培养细菌：Ⅰ.细菌多样性初步分析   总被引：1，自引：0，他引：1  

周丽华  陈士超  邓志瑞  陈沁  郑乐平  刘志学 《湖泊科学》2009,21(1)

采用牛肉膏培养基培养,从不同深度的太湖沉积物中共分离得到603个菌落形态不同的菌株,通过数值分析比较了40个形态表征性状,以不加权平均连锁聚类(UPGMA)的方式进行簇群归类,在0.75水平上可分成4个聚类群和51个亚群,从51个亚群中各随机选取一个菌株,测定其16SrDNA部分序列(约540bp)并据此进行分析,表明这些菌株分别属于Firmicutes、Actinobacteria、γ-Proteobacteria这三大类群,与数据库中已知的芽孢杆菌属(Bacillus)、类芽孢杆菌属(Paenibacillus)、微球菌属(Micrococcus)、节杆菌属(Arthrobacter)、迪茨菌属(Dietzia)和假单胞菌属(Pseudomonas)细菌具有很高的相似性,其中迪茨菌属在国内淡水湖泊沉积物中为首次报道.  相似文献   

吕梁山西麓吴家峁剖面红粘土的古地磁年代及构造意义     

徐永  唐亚明  潘峰  李建星  张睿  岳乐平 《第四纪研究》2019,39(2):328-338

新近纪中晚期以来吕梁山西麓堆积了一套厚层红粘土。由于红粘土堆积早期有水流作用的参与,导致红粘土中夹杂有数层砾石层,这些砾石层记录了吕梁山山体隆升的信息。文章对山西省吕梁市中阳县吴家峁剖面红粘土进行了沉积学和磁性地层学研究,探讨吕梁山西麓红粘土的堆积过程以及吕梁山新近纪的抬升事件。磁性地层结果显示吴家峁剖面的古地磁年龄大约为7.1~2.6 Ma。所含砾石层的古地磁年龄分别为6.2 Ma、5.9 Ma、5.8 Ma、5.5 Ma、4.9 Ma、4.0 Ma和3.7 Ma,其中6.2 Ma和4.9 Ma两层砾石层较厚,延伸较远,较稳定。结合吕梁山西麓中段卫家洼和复兴剖面的研究,得出红粘土中砾石层是吕梁山隆升剥蚀的产物,推断在大致8.1~3.7 Ma之间吕梁山有较为明显的隆升。目前在吕梁山西麓中段的研究不支持这些砾石层是古黄河或者古湖泊沉积物。  相似文献   

A New Model for Correlation between the Marine Benthic Oxygen Isotope and Red Clay Magnetic Susceptibility on the Chinese Loess Plateau     

GONG Hujun  ZHANG Rui  ZHANG Yunxiang  YUE Leping 《《地质学报》英文版》2017,91(3):1163-1164

<正>Objective Aeolian sediments on the Chinese Loess Plateau contain some of the best continental archives of palaeoclimate change in the Late Cenozoic.The consensus that alternating MS in loess-paleosols in China was due to the strengthening and weakening of the East Asian palaeomonsoon provides an excellent climate record when correlated with global ice volume.Significantly,new basal dates from the red clay underlying the loess-paleosol sequence indicate that wind-blown dust began to accumulate on the Chinese Loess Plateau at least 22  相似文献   

岩溶地区山地森林土壤CO2 的同位素组成研究   总被引：3，自引：0，他引：3  

郑乐平 《中国岩溶》1998,17(4):325-330

岩溶地区山地森林土壤中CO2 的δ13 C值较大气CO2 的δ13 C值低,自地表向下,随着土壤深度的增加,δ13 C值减小, CO2 含量增高,变化的拐点在土壤的表层;在拐点深度之上, CO2 含量略有升高,δ13 C值急剧降低;在拐点深度之下, CO2 含量呈线形上升,δ13 C值趋于定值;土壤CO2 的δ13 C端元值为- 21. 485‰。自地表以下,随着土壤深度的增大,δ18O值以近线形的关系减小。   相似文献   

陕西洛南龙牙洞遗址的特征和环境   总被引：1，自引：0，他引：1       下载免费PDF全文

薛祥煦  邓涛  李传令  岳乐平  张宏彦  陈民权  张学锋 《第四纪研究》1999,19(2):170-175

要本文第一作者曾在陕西洛南龙牙南洞中获得洛南直立人的上臼齿及少量哺乳类化石。近年作者等又在龙牙北洞中采集到大量石制品及哺乳动物化石。龙牙洞是黄河流域最南的一个旧石器遗址。由30多种哺乳类化石组成的龙牙洞动物群是一个兼具古北界和东洋界动物的过渡型动物群,可与蓝田公王岭动物群对比,时代为早更新世晚期,是温暖、湿润的森林、草原、多水体环境条件下的动物组合。石制品非常丰富,属华北旧石器文化系统,但又可见南方文化的影响。龙牙北洞遗址很可能是洛南直立人制作石器的场地。  相似文献   

中国北方陆相沉积5.30Ma磁性地层序列   总被引：8，自引：2，他引：6  

岳乐平  张云翔 《地质论评》1999,45(4):444-448

本文通过中国北方新第三纪晚期典型剖面的磁性地层研究,建立５．３０Ｍａ以来中国北方陆相沉积积磁性地层序列。中国黄土记录了Ｂｒｕｎｈｅｓ正极性带与Ｍａｔｕｙａｍａ负极性带,年龄约２．５０Ｍａ。静乐红土（包括静乐剖面,榆林剖面,蓝田剖面）对应于Ｇａｕｓｓ正极性带与Ｇｉｌｂｅｒｔ负极性带,年龄约２．５０￣５．３０Ｍａ。三门组记录了Ｍａｔｕｙａｍａ负极性带下段,年龄约１．２０￣２．５０Ｍａ。游河组记录了Ｇａ  相似文献   

GBInSAR在大坝变形监测中的应用     

郭乐萍  岳建平  岳顺  邱志伟  汪学琴 《测绘工程》2017,26(2)

评判水工建筑物的工作性态,需高精度的变形、应力等信息。根据大坝安全监测特点和要求,介绍GBSAR监测系统构成和测量基本原理,分析该系统测量误差来源及特征,探讨该技术在大坝变形监测中的可行性。以隔河岩大坝3d的实测数据为例,分析该技术实际测量精度,研究显示成果达亚毫米级,能够满足大坝变形监测的精度要求。  相似文献   

Environmental change since mid-Pleistocene re-corded in Shangshan achaeological site of Zhejiang     

MAO Longjiang  MO Duowen  JIANG Leping  JIA Yaofeng  LIU Xiaoyan  LI Minglin  ZHOU Kunshu  SHI Chenxi 《地理学报》2008,18(2):247-256

At about 173 ka BP of the late period of mid-Pleistocene, the second terrace of the river had been formed as a result of uplift happening in Shangshan area because of the cli-mate, sea level change and tectonic action. Between 173?75 ka BP, aeolian deposited on the terrace, a layer of reticulate red clayey soil about 80?100 cm thick deposited and developed under the warmer and higher temperature. In the last glacial period, the drop of the tem-perature and the decrease of the precipitation induced the dust-storms increased, A layer of Xiashu loess about 1.0?1.5 m thick accumulated on Shangshan terrace in the last glacial, which has the reticulate red clayey soil buried. At the beginning of the Holocene (11500 a BP?), temperature went higher gradually and precipitation got more, the pre-persons moved on the Shangshan terrace (11,400?8600 a BP), which is one of the most important archaeo-logical sites, and can connect the paleolithic culture with Neolithic culture. It could be as-sumed from the results that the lower reaches of the Yangtze River are the home of rice cul-tivation, too. The lower place to the west of the Shangshan site experienced the two cycles process of the fluvial facies and the lacustrine facies, indicating that the water source of the pre-historical Shangshan is the river water or lake water. Two AMS 14C age proved the water source disappeared more than 1000 years ago.  相似文献   

The study of land desertification in transitional zones between the MU US Desert and the Loess Plateau using RS and GIS—a case study of the Yulin region   总被引：1，自引：0，他引：1  

Li?ZhangEmail author  Leping?Yue  Bin?Xia 《Environmental Geology》2003,44(5):530-534

In this study, the land desertification of transitional zones of desert loess in the Yulin region (China) is studied from TM images in a geographical information system (GIS). It is found that the desertification in Yulin is still severe. The desertified land accounts for 67.7% of the total land areas. The distribution of desertified land shows obvious spatial imbalance, with severe desertification in northwestern regions and slight desertification in southeastern regions. This imbalance is related to the difference in physical factors and land-use pattern. The process of desertification in Yulin areas shows a steady and even reversed trend between 1987 and 1999, as a result of positive efforts. At the end of the paper the cause of desertification is discussed. It is believed that the interaction and confliction between the natural process and human activities may lead to the development of desertification.  相似文献   

中国北部新第三纪红层划分的岩石学标志及其意义   总被引：4，自引：0，他引：4  

张云翔  岳乐平  陈丹玲  薛祥煦 《地层学杂志》1997,(1)

广布于我国北方的新第三纪红层多由中新统保德组和上新统静乐组组成，这两个组岩性相似，一般情况下难以区分。地层结构详细研究显示，两组中钙质结核赋存方式相差很大，前者呈层状产出，后者为星散状，地层形成时古气候条件的差别是导致该现象的主要原因。由于大气状况具有区域性特点，因而这一地层划分标志具有特定的地质意义及在大面积内具实用的价值  相似文献