The O and H isotope characteristics of water from major rivers in China     

Si-Liang Li  Fu-Jun Yue  Cong-Qiang Liu  Hu Ding  Zhi-Qi Zhao  Xiaodong Li 《中国地球化学学报》2015,(1):28-37

Isotopic compositions of the water sources and evapotranspiration in large rivers of China are not well explored. In this investigation, d18 O and dD values of water from major large rivers of China are integrated to understand the spatial and temporal variations in the isotopes of water and d-excess. River water samples were collected from the channels and tributaries of the Changjiang, Yellow, Songhua and Liao Rivers in China. Water from upstream was generally enriched with light isotopes relative to that from downstream areas. Water from the Songhua River and upper reach of the Changjiang River has relatively negative isotopic values impacted by latitude and altitude effects, respectively. The spatial pattern showed that d18O-H2 O values in rivers mainly ranged from-9 to-7 % in most of China based on roughly mapped contours, and rivers enriched in light isotopes were primarily located in the Tibetan Plateau and northeast China The slopes of linear regression from the Yellow and Liao Rivers suggested that the loss of water by direct evaporation shifted the isotopes of water, especially in some small tributaries. Additionally, there was a narrow range of low d18OH2 O values from the main channel of rivers during the lowflow season relative to the high-flow season due to influence of the monsoon climate. No distinct spatial variation of d-excess values was found in the rivers of China. However, water samples in some rivers with low d-excess values had high d18 O values, indicating that evaporation in the tributaries has led to significant water loss, especially in tributaries of the Yellow and Liao Rivers.  相似文献   

The Application of Fracture Interpretation Technology Based on Ant Tracking in Sudeerte Oilfield     

ZHANG Xingxing  LI Tingting  SHI Yue  ZHAO Yanqi 《《地质学报》英文版》2015,89(Z1):437-438

  相似文献   

Spatial and temporal water quality characteristics of Poyang Lake Migratory Bird Sanctuary in China     

Yue Liang  Huayun Xiao  Xiaozhen Liu  Jian Xiong  Wenhua Li 《中国地球化学学报》2015,(1):38-46

Poyang Lake Migratory Bird Sanctuary includes Bang Lake, Sha Lake, Dahu Lake, and estuaries of the Xiu and Gan Rivers in the Migratory Bird Natural Reserve. Water samples were collected and analyzed to study spatial and temporal water quality variation. Strong seasonal variation of water quality was found. The water quality of Bang Lake was relatively poor compared to Sha and Dahu Lakes in the wet season, but better in the normal season. During the dry season, the water quality of Bang Lake is negatively affected by the activity of migratory birds. According to the correlation analysis of monthly concentrations of each parameter, the concentrations of COD, NH?-4–N, and NO3–N were highly correlated. The correlation index was 0.829 and significance index was0.042 \ 0.05. From north to south within Bang Lake, the concentration of TN decreased; however, the concentration of Chl-a increased. From east to west within Bang Lake,concentrations of COD, NH?4–N, NO-3–N, and Chl-a increased. The Xiu and Gan Rivers influence the water quality of Bang Lake, especially in the northeast area of the lake. The water quality of Bang Lake only reached Chinese water quality standard level IV or V according to a fuzzy comprehensive evaluation. The evaluation factors impacting Bang Lake are TN[TP[NH?4–N[COD, in order of decreasing importance. The waters of Poyang Lake Migratory Bird Sanctuary have been polluted; one of the important contributing factors was migratory birds’ disturbance and feces.  相似文献   

The Confirmation of the Neoproterozoic Langshan Group in Inner Mongolia and Its Significance   总被引：1，自引：0，他引：1  

HU Jianmin  GONG Wangbin  ZHAO Yue  ZHANG Shuanhong  WU Sujuan  QU Hongjie  LI Zhenhong  LIANG Xia 《《地质学报》英文版》2015,89(1):318-319

<正>There is a large Mesoproterozoic rift at the northern margin of North China Craton(NCC),and one of China’s most important metallogenic belts,the Langshan-Zhaertai Shan-Bayan Obo mesoproterozoic metallogenic belt is just located in this rift.This metallogenic belt contains some large or ultra-large ore deposits,such as the Bayan Obo iron deposits and ultra-large rare earth deposits,and the large Dongshengmiao Cu-Pb-Zn sulphide deposits.The Zhaertai Group is composed of a set of metamorphic rocks,interbedded with thin ferruginous  相似文献   

Evolution of the Ediacaran Doushantuoian Meta-Paleo-Community in Northeast Guizhou, South China     

WANG Yue  CHEN Hongde  WANG Xunlian  HUANG Yuming 《《地质学报》英文版》2011,85(3):533-543

Macroscopic organisms lived in the Yangtze Sea of South China during the Late Doushantuo period of the Ediacaran. The results of the specimen collections and statistics within each meter show that the macroscopic biota from the Ediacaran Doushantuo Formation in northeast Guizhou, South China, can be subdivided into Globusphyton, Cucullus, Sectoralga–Longifuniculum, Beltanelliformis, and Baculiphyca–Gesinella paleo-communities. The paleo-community evolution indicates the relationship not only between biota and environment, but also between metaphytes and metazoans. From the Globusphyton paleo-community, through to the Sectoralga–Longifuniculum paleo-community, to the Cucullus paleo-community, the increase in the abundance and diversity of metaphytes (especially the branching macroalgae) and metazoans implies that the oxygen content in the seawater increased gradually. Both the Beltanelliformis and Baculiphyca–Gesinella paleo-communities could be related to a deteriorated environment and fragile ecosystem. The emergence, abundance, and diversity of macroscopic metaphytes, which were closely connected with the environmental microchanges, accelerated the process, improving the environment and increasing oxygen, and established an important platform for the development of macroscopic metazoans.  相似文献   

A Study of the Energy Sources of Herbig—Haro Objects     

Jing－Wen  Yue－FangWu 《中国天文和天体物理学报》2002,2(1):33-42

1 INTRODUCTIONHerbig-Haro objects are a kind of semi-sta]c, semi-nebuIa objects associated with star fOrm-ing regions. Although such objects were noticed by Burnham as early as l890s, they did notattract much attention until the late 1940s until their independent rediscovery by Herbig andHaro in NGC 1999. A few years later, these objects were named Herbig-Haro objects fOr thefirst time by Ambartsumian (Reipurth 1997). In the fOllowing half century, the observationand theoretical res…  相似文献   

The Third Peak of the 1998 Leonid Meteor Shower   总被引：2，自引：0，他引：2  

Yue－HuaMa  You－WenHe 《中国天文和天体物理学报》2001,1(3):271-274

1 INTRODUCTIONThe Leonid meteor shower is a well-known periodic meteor shower. Its history is tied upwith the development of the theory of meteor stream astronomy itself. It was the very st.rongshowers of 1799 and 1833 that played a sghficant pat in the recoghtion of the ealstence ofmeteoroid streams. These evellts started the obse~ions of Leoaid meteor shower and broughtabout the birth of meteoritiCS. It is known that the Leould parent comet, 55P/Tempel-TUttle,has an orbital period a…  相似文献   

Global Axisymmetric Stability Analysis for a Composite System of Two Gravitationally Coupled Scale-Free Discs     

Yue Shen  Yu-Qing Lou Department of Physics & Center for Astrophysics  Tsinghua University  Beijing  National Astronomical Observatories  Chinese Academy of Sciences  Beijing Department of Astronomy  Astrophysics  The University of Chicago  South Ellis Avenue  Chicago  IL USA   《中国天文和天体物理学报》2004,4(6):541-552

For a composite system of gravitationally coupled stellar and gaseous discs, we have carried out a linear stability analysis for axisymmetric coplanar perturbations using the two-fluid formalism. The background stellar and gaseous discs are taken to be scale-free with all physical variables varying as powers of the cylindrical radius r with compatible exponents. The unstable modes set in as neutral modes or stationary perturbation configurations with angular frequency ω=0. The axisymmetric stable range is bounded by two marginal stability curves derived from stationary perturbation configurations. Because of the gravitational coupling between the stellar and the gaseous discs, one only needs to consider the parameter regime of the stellar disc. There exist two unstable regimes in general: a collapse regime corresponding to large-scale perturbations and a ring-fragmentation regime corresponding to short-wavelength perturbations. The composite system will collapse if it rotates too slowly and will succumb to ring-fragmentation instabilities if it rotates sufficiently fast. The overall stable range against axisymmetric perturbations is determined by a necossary D-criterion involving the effective Mach number squared Ds^2 (the squared ratio of the stellar disc rotation speed to the stellar velocity dispersion up to a numerical factor). Different mass ratio δ and sound speed ratio of the gaseous and stellar disc components will alter the overall stability. For spiral galaxies or circumnuclear discs, we further include the dynamical effect of a massive dark matter halo. Astrophysical applications to disc galaxies, proto-stellar discs and circumnuclear discs are given as examples.  相似文献   

Crustal Electrical Structure and its Constraints on Mineralization Revealed by Magnetotellurics     

Sheng Jin  Yue Sheng  Yaotian Yin 《《地质学报》英文版》2018,92(Z1):247-248

  相似文献   

The response of Caragana microphylla seedlings to water table changes in Horqin Sandy Land, China     

YunHua M  TongHui Zhang  XinPing Liu  Wei Mao  XiangFei Yue 《寒旱区科学》2015,7(1):0088-0093

This paper focuses on the growth response of Caragana microphylla seedlings to changes of artificially controlled water table in Horqin Sandy Land, China. Monitoring results of soil water content shows that soil moisture is closely correlated to groundwater depths. Soil volumetric water increased rapidly when close to water sources and finally stabilized in a saturated state. The soil moisture trend of CK(control) increased gradually at 0–50 cm of soil depth then decreased to 4% below 50 cm soil depth. C. microphylla can adapt to different soil environments by changes in ecological and physiological characteristics. By comparing the ecological characteristics of C. microphylla seedlings at various water tables, we found that a shallow water table of 40 cm depth inhibited seedling growth because of weak ecological characteristics. A groundwater depth of 120 cm was more advantageous for plant height and canopy growth of C. microphylla seedlings. During the first two years, the most suitable water depth for root biomass was 120 cm, and 180 cm for root length. The growth of vertical roots is positively correlated with groundwater depth, and root thickness is the determinate factor for root biomass while the fine root is the determinate factor for root length. A thick root would grow much more in a natural drought environment while access to ground water promotes the growth of fine roots.  相似文献