检索结果-南通市图书馆

土壤通报 2000年第2期31卷 91-95页

作者：徐文彬中国科学院地球化学研究所环境地球化学国家重点实验室贵州贵阳550002

土壤是N2.O的最主要释放源 .本文综述了根据局部地区土壤N2.O释放观察结果 ,推算和预测宏观尺度土壤甚至全球土壤N2.O释放通量变化和年释放量的方法 ,评述了各类方法的优缺点 ;并着重讨论了释放过程机理模型的应用 .

关键词： N2. 宏马尺度土壤释放量释放过程机理模型

7~Be: A Geochemical Tracer for Seasonal Erosion of Surface Soil in Watershed of Lake Hongfeng, guizhou, china

在线全文

学校读者我要写书评

暂无评论

Pedosphere 1996年第1期6卷 23-28页

作者： BAI ZHANGUO WAN GUOJIANG WANG CHANGSHENG WAN XI HUANGRONGGUI P.H. SANTSCHIZ and M. BASKARANZ(1￣State Key Lab. Of environmental Geochemistry, institute of Geochemistry, Chinese Academy of Sciences,{2. 550002.(china))(2.Department Of Marine Scien State Key Lab. of environmental Geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang 550005 China Department of Marine Sciences Texas a K M University Galveston TX 77551 United States

e penetrative depth in undisturbed surface soil is within 4 mm.7￣Be activity shows exponential decrease with soil depth, which is expressed as a diffusion process.7￣Be penetrative depth in undisturbed surface soil is apparently deeper in the fall (0.2.-0.37 g cm￣(-2. than in the spring (0.11-0.2. g cm￣(-2. at the same site; Whereas, ￣7Be apparent activity at the top of surface soil is higher in the spring (0.3-2.2.Bq g￣(-1_) than in the fall (0.2.0.5 Bq g￣(-1) at the same site. The ￣7Be inventory (189-544 Bq m￣(-2. changes with both locations and seasons. Although the ￣7Be flux to the earth's surface increases with amount of precipitation, its maximum inventory in the soil profiles decreases to 30%-40% after the rainy period. Calculated by the diffusion equation, the erosion and accumulation rates of soil particles are agreeable with the observation in situ., which shows that the rates in fall are 1.5 times those in spring. The eroded soil particles almost all have been removed on the tablelands rather than transported into the drainage system. This indicstes that the soil erosion process in the karst region is only partial transportation within a short distance.

关键词： e erosion trace Lake Hongfeng watershed surface soil

Fallout radionuclides (~7Be and ^(137)Cs) in surface soils and lake sediments in west Yunnan and central guizhou, china

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 1999年第S2期44卷 125-126页

作者： BAI Zhanguo~(1,2. and WAN Guojiang~1 1. State Key Laboratory of environmental Geochemistry, institute of Geochemistry, Chinese Academy of Sciences,{2. 2. State Key Laboratory of Plant Nutrition Research of Chinese Ministry of Agriculture institute of Soil and Fertilizer, Chinese Academy of Agricultural Sciences, Beijing 100081, china

WEST Yunnan and central guizhou with variable altitudes and similar latitudes, located in the Yunnan-guizhou Plateau of the eastern slope uplifting Himalayas, were selected as study areas in this note. Thetwo areas consist mainly of carbonate rocks discontinuously covered by similar soil types with severe soiland water loss except Lugu Lake catchment. Climate of the study areas is subtropical monsoon, apparently influenced by mingled southeastern monsoon and southwestern monsoon with abundant *** study is to comparatively describe distribution and inventory of 7Be and 137Cs in the sediments of Erhai Lake, Lugu Lake and Hongfeng Lake as well as in 2. surface soil profiles of their *** results have shown that: （i） In all the soil profiles, 7Be activities decrease exponentially with soil depth. 7Be apparent ac-

关键词： radionuclides soils sediments china.

Geochemical records of carbon in recent sediments of Erhai Lake, china: Implication of effects of the Himalayas uplift on global environmental changes

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 1999年第S2期44卷 123-124页

作者： WAN Guojiang~1, BAI Zhanguo~(1,2., WANG Haoran~1 and HUANG Ronggui~1 1. State Key Laboratory of environmental Geochemistry, institute of Geochemistry, Chinese Academy of Sciences,{2. 2. State Key Laboratory of Plant Nutrition Research of Chinese Ministry of Agriculture, institute of Soil and Fertilizer, Chinese Academy of Agricultural Sciences, Beijing 100081, china

THE formation and uplift of the Himalayas and the Tibetan Plateau may have been responsible for the past150 Ma global environmental changes, resulting in the development of a three-tiered landform in southernchina. The Yunnan-{2. Plateau, as the middle tier in eastern slope of the Himalayas, has beencomplex environmental unit with great altitude gradients and plateau landform characters. Both monsoonsfrom the Pacific and the Indian resulting in apparent environmental changes on variable time scales influence it. environmental geochemical effect of low latitude-high altitude could be yielded, and well recorded in the geological bodies in this region. To build and verify a quantitative model of environmental evolution it is necessary to obtain high-resolution data of elemental cycles and mass equilibrium.

关键词： records sediments Erhai Lake Himalayas uplift global environmental changes.

Non-point source pollution of Wujiang River watershed in guizhou Province, SW china

在线全文

学校读者我要写书评

暂无评论

Acta Geochimica 2006年第S1期 141-142页

作者： Congguo TANG1,2. Congqiang LIU1 1 State Key Laboratory of environmental Geochemistry, institute of Geochemistry, Chinese Academy of Sciences,{2. 2.Graduate School, Chinese Academy of Sciences, Beijing 100049, china

Distribution of mercury species in water and sediments in Caohai Lake, guizhou Province

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Acta Geochimica 2006年第S1期 153-154页

作者： Xiaoli QIAN1,2. Xinbin FENG1, Xiangyang BI1,3 1 State Key Laboratory of environmental Geochemistry, institute of Geochemistry Chinese Academy of Sciences,{2. 2.Guizou University, guiyang 55002., china 3 Graduate School of the Chinese Academy Sciences, Beijing 100039,china

Total gaseous mercury emissions from mercury-enriched soil in guizhou, china

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Acta Geochimica 2006年第S1期 243-244页

作者： Xinbin FENG, Shaofeng WANG, Guangle QIU, Yamin HOU, Shunlin TANG State Key Laboratory of environmental Geochemistry, institute of Geochemistry, Chinese Academy of Sciences,{2.

Water geochemistry of the Xijiang basin rivers,South china:Chemical weathering and CO2.consumption

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Water geochemistry of the Xijiang basin rivers,South China:C...

137Cs技术定量侵蚀速率常用模型及其讨论

中国科学院地质与地球物理研究所第十届(2.10年度)学术年会

作者： Zhifang Xu~(a,*),Cong-Qiang Liu~b a Key Laboratory of Engineering Geomechanics,institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 10002.,china b State Key Laboratory of {2. Geochemistry,institute of Geochemistry,Chinese Academy of Sciences,guiyang,guizhou 550002.china

The Xijiang River,the mainstream of the Zhujiang(Pearl)River,which is the second largest river in china in terms of discharge,flows through a large carbonate rock region in South *** chemical and Sr isotopic compositions of the Xijiang waters were determined during the high-flow season in order to understand the chemical weathering processes,associated CO consumption and anthropogenic influences within the carbonate-dominated *** major ion compositions of the river waters are characterized by the dominance of Ca,Mg,HCOand are significantly rich in *** SOis mainly derived from the oxidation of sulfide minerals and acid precipitation caused by coal *** and Sr isotopic compositions of the river waters indicate that four reservoirs(carbonates,silicates, evaporites and anthropogenic inputs)contribute to the total dissolved *** chemical weathering rates of carbonates and silicates for the Xijiang basin are estimated to be approximately 78.5 and 7.45 ton km a,*** total chemical weathering rate of rocks for the Xijiang basin is approximately 86.1 ton kma or 42.mm ka which is much higher than global mean *** budgets of CO consumption by carbonate and silicate weathering are estimated to be 2.4×10 and 54.3×10 mol a,*** would appear that HSO is involved as a proton donor in weathering reactions in the Xijiang basin;calculated results show that the contribution of cations from rock weathering induced by HSO accounts for approximately 11.2..Results from this study show that the flux of CO released into the atmosphere is approximately 0.1×10 mol C km a or 0.41×10g Ca produced by HSO-induced carbonate weathering in the *** extrapolated to the entire surface area of carbonate in SW china,the flux of CO released to the atmosphere by HSO-induced carbonate weathering is about 1.41×10gCa.

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

山地学报 2002年第5期20卷 600-605页

作者：郑永春王世杰中国科学院地球化学研究所环境地球化学国家重点实验室中国科学院地球化学研究所环境地球化学国家重点实验室贵州贵阳550002.国科学院研究生院北京100039

土壤侵蚀将导致严重的土地退化和其它环境危害 ,侵蚀危害的评估需要关于侵蚀速率和侵蚀的时空分布模式的大量信息。1 37Cs具有独特的输入来源和地球化学性质 ,使其成为研究自1 37Cs首次沉降以来约 30年的平均土壤侵蚀速率的最优示踪剂... 详细信息

土壤侵蚀将导致严重的土地退化和其它环境危害 ,侵蚀危害的评估需要关于侵蚀速率和侵蚀的时空分布模式的大量信息。1 37Cs具有独特的输入来源和地球化学性质 ,使其成为研究自1 37Cs首次沉降以来约 30年的平均土壤侵蚀速率的最优示踪剂。比例模型、简化的质量平衡模型、基于1 37Cs地表富集的质量平衡模型、剖面分布模型是近年来常用的几种模型 ,各有其优势和局限性。这些模型都是在一些假设的基础上推导出来的 ,这些假设是否成立需要理论论证和实验验证 ,文章对多数定量模型所含的假设条件进行讨论

关键词： 137Cs 侵蚀速率定量模型假设条件耕作稀释

胶质芽胞杆菌对磷矿石风化作用时细菌蛋白质的双向电泳分析

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

微生物学通报 2009年第3期36卷 334-338页

作者：谌书刘从强连宾中国科学院地球化学研究所环境地球化学国家重点实验室贵州贵阳550002 西南科技大学固体废物处理与资源化省部共建教育部重点实验室四川绵阳621010

本文研究对磷矿石有风化作用的胶质芽胞杆菌(Bacillus muscilaginosus)在风化磷矿石过程中菌体蛋白质组的变化及差异,以此了解该风化作用的分子生物学机制。将该菌接入液体培养基中,加磷矿粉为处理组,不加磷矿粉为对照组,静置培养。培养... 详细信息

本文研究对磷矿石有风化作用的胶质芽胞杆菌(Bacillus muscilaginosus)在风化磷矿石过程中菌体蛋白质组的变化及差异,以此了解该风化作用的分子生物学机制。将该菌接入液体培养基中,加磷矿粉为处理组,不加磷矿粉为对照组,静置培养。培养10d后,取上清液离心后的固体物和部分上清液中的外分泌蛋白用作菌体蛋白质组学分析。菌体蛋白质组二维电泳图谱进行比较和软件分析后,处理组可见蛋白点数为(1134±98)个,对照组可见蛋白点数为(72.±53)个,两者比较具有统计学差异(P2.4个蛋白点表达上调,75个蛋白点表达下调,2.7个蛋白质点为新合成。细菌对磷矿石风化作用时激活了某些蛋白的表达,新合成、表达量增加和表达量下降的蛋白质点与细胞的代谢调控、细胞激活、增生、分化和信号转导通路等有关;揭示了该菌受矿粉的影响及其适应环境的分子生物学机制。

关键词：胶质芽胞杆菌磷矿石微生物风化蛋白质组