Sources and transportation of suspended matter and sediment in the southern Yellow Sea: Evidence from stable carbon isotopes

The concentrations of total suspended matter (TSM) and the compositions of organic stable carbon iso- topes of TSM and bottom sediments were analyzed to study the sources of TSM and sediments and the transportation processes. For this study, 284 TSM samples and 64 sediment ones taken from 67 stations along 7 transects and in 5 layers were collected in the southern Yellow Sea on the cruise in May, 1998. The main sediment transportation pattern in the southern Yellow Sea was obtained by analyzing the distribu- tion characteristics of TSM concentration and particulate organic carbon δ~(13)C values. It was confirmed from the pat- tern that the bottom layer plays a more important role than the surface one in the transportation processes of terrigenous material to the central deep-water area of the southern Yel- low Sea. The Yellow Sea circulation is an important control factor in determining the sediment transportation pattern in the southern Yellow Sea, The carbon isotope signals of sedi- mentary organic matter confirmed that the main material in sediments with high sedimentation rate in the Shandong subaqueous delta originated from the modern Yellow River. The terrigenous sediments in the deep-water area of the southern Yellow Sea are mainly from the abandoned Yellow River and the modern Yellow River, and a small portion of them are from the modern Yangtze material. The amount of terrigenous material from Korean Peninsula and its influen- ce range are relatively limited. The conclusions derived from TSM and stable carbon isotopes were further confirmed by another independent material source tracer-PAHs.     

松辽盆地南部含片钠铝石砂岩储层岩石学特征及成因

 针对松辽盆地南部白垩系含片钠铝石砂岩储层,应用岩石学及同位素地球化学的原理和方法,对含片钠铝石砂岩储层的岩石类型、成岩共生序列和片钠铝石的产状及成因进行系统研究。研究结果显示,含片钠铝石砂岩储层的岩石类型以长石砂岩和长石岩屑砂岩为主,成岩共生序列依次为黏土矿物包壳-次生加大长石-次生加大石英、自生微晶石英、自生高岭石-方解石-油气充注-CO₂ 充注-片钠铝石-铁白云石。松辽盆地南部片钠铝石的δ¹³C_PDB 为-0.342%~0.329%,δ¹⁸O_PDB 变化范围为-1.922%~-0.954%,与已证实形成于无机CO₂背景、且同岩浆活动有成因联系的片钠铝石极为相近;而与片钠铝石平衡的CO₂气的碳同位素值为-0.992%~-0.423%,与松辽盆地南部CO₂气藏中CO₂的碳同位素一致,说明松辽盆地南部片钠铝石与气藏中的CO₂具有相同的碳来源,均为幔源-岩浆成因。     

中国南方80个地表水体的酸沉降临界负荷计算

研究了酸沉降对中国南方地表水体的影响。应用动态酸化模型 MAGIC,计算了中国南方 80个地表水体的酸沉降临界负荷。结果表明 :大部分水体的酸沉降临界负荷较高 ,大于 2 kmol.hm- 2 .a- 1 ,呈现地带性分布。西南地区的地表水酸沉降临界负荷高于华东和华南地区 ,这主要是因为南方土壤的酸化敏感性由东南向西北减弱。临界负荷较高 ,表明这些水体对酸化不敏感。地表水酸化不太可能成为中国严重的区域环境问题。但是少数山地水体的酸化趋势值得关注。     

近20年莱州湾南岸滨海湿地退化及其原因分析

以1987年和2002年的Landsat 5、Landsat 7卫星遥感影像空间属性数据为基本材料.结合实地调查,研究了近20年来莱州湾南岸滨海湿地的退化及原因.莱州湾南岸滨海湿地的退化包括物理退化、生物退化和化学退化3个方面.湿地的物理退化表现为自然湿地面积减小、景观多样性水平下降;湿地的生物退化表现为生物多样性水平下降、自然湿地净初级生产力降低:湿地的化学退化表现为湿地吸收CO2及释放O2的气体调节功能下降、吸收净化N功能的下降等.引起莱州湾南岸滨海湿地退化的自然因素有气候变暖和持续干旱、河流径流量减小、风暴潮、海岸侵蚀等.人为因素有围垦湿地、超量开采利用水资源、人类活动引起的地下咸卤水入侵、道路建设等.     

松辽盆地南部泉四段扶余油层致密砂岩储层微观孔喉结构特征

综合运用铸体薄片观察、扫描电镜、高压压汞、恒速压汞及图像分析等技术手段,对松辽盆地南部泉四段扶余油层致密砂岩储层储集空间、储集物性、微观孔喉分布及不同尺度孔喉对储层物性的贡献等特征进行精细表征,并分析不同微观孔喉参数与储层物性的相关关系。结果表明,研究区致密砂岩储层物性差、孔喉半径小;储集空间以粒内和粒间溶孔为主,含部分原生孔和黏土矿物晶间孔。储层孔隙半径分布差异不明显,而喉道半径与孔喉比分布差异较大;储层物性越好,喉道半径分布范围越宽,峰值喉道半径越大,并且右偏特征越明显;储层渗透率越高,对渗透率起主要贡献的孔喉半径越大;孔喉比分布与喉道半径分布呈现相反的特征。渗透率主要由岩石中少量的微米级孔喉贡献;纳米级孔喉所占体积很大,却只有较小的渗流能力,并且渗透率越低,纳米级孔喉所占的相对比例越大。微观孔喉结构参数对储层物性的影响主要体现在渗透率上,而对孔隙度的影响较小。     

苏南地区高校女大学生参与体育运动的影响因子分析

以苏南地区10所高校中的800名女大学生作为调查对象,采用问卷调查法、访谈法和数理统计法等研究方法,对苏南地区高校女大学生参与体育运动的影响因素进行研究和因子分析。经过统计分析得出,影响苏南地区高校女大学生参与体育运动主要有5大因素:胆怯自卑心理、体育兴趣、体育氛围、学校体育场地设施数量和体育教师思想道德素质,并据此提出针对建议。     

渝东北(南)三峡库区成人高等教育人本管理模式探究

渝东北(南)三峡库区是重庆市乃至于全国的连片贫困区,此地区成人高等教育资源不足,管理方式落后。针对上述问题笔者提出采用主体际的人本管理模式,可以充分发挥各主体的主观能动性,促进库区成人高等教育的发展。     

皖南地区村庄建设规划的策略研究

建设社会主义新农村是我国现代化建设进程中的重大历史任务,也是构建和谐社会的重要一环.结合长期村庄规划建设的工作经验,探讨皖南地区农村的风貌特征,提出皖南地区村庄建设规划的基本原则、途径与策略,从而推动皖南地区新农村建设取得实效.     

Influence of variation in precipitation on the δD values of terrestrial n-alkanes on the southern Tibetan Plateau

A short lake sedimentary core and ice core were recovered from Lake Chen Co and Noijingangsang Glacier,respectively,in the Lake Yamdrok watershed of the southern Tibetan Plateau.Hydrogen isotope ratios of the ice core(δDice) and δD values of terrestrial n-alkanes(δDwax) in the sediments showed a linear correlation(R2 = 0.41,P = 0.047) over the past 80 years,indicating the effect of hydrogen isotope ratios of precipitation(δDp) on δDwax.However,apparent fractionation(εwax-p) values of δDwax relative to δDice increased with decreasing ice core accumulation(amount of precipitation;R2 = 0.65,P = 0.0051),revealing that dry or wet climate variation had a significant impact on δDwax.Thus,precipitation amount and δDp are both important in determining δDwax.     

New species of Doliodrilus and other Limnodriloidinae (Oligochaeta,Tubificidae) from Hainan and other parts of the north-west Pacific Ocean

Thirteen species of Limnodriloidinae (Tubificidae) are recorded from marine and brackish-water habitats of Hainan Island, southern China, including 11 species of Doliodrilus and two species belonging to Limnodriloides. Eight species are new to science: D. bisaccus sp. n. (types from Japan), D. longidentatus sp. n. (types from Hong Kong), D. ciliatus sp. n., D. adiacens sp. n., D. fibrisaccus sp. n. (also from Fiji), D. brachyductus sp. n., D. bidolium sp. n. and D. chinensis sp. n. In addition, material of D. puertoricensis Erséus and Milligan, 1988, from New Caledonia, is briefly described. This study shows that Doliodrilus is unexpectedly species-rich in Asian seas, in particular, around Hainan. Including an unnamed species from this island, the known members of this genus increase from three to 12.