藻体海水培养液中铜的化学存在形式     

于圣睿 《中国海洋大学学报(自然科学版)》1990,(4)

采用金属络合物通式模型,在IBM-PC计算机上计算了不同pH(7.5～9.5)、碱度(2.3～2.5mmol dm~(-3))和加入不同浓度的铜离子(1.0×10~(-4)～1.0mg dm~(-3))条件下,海水培养液中铜的主要化学存在形式分配的百分数。还给出了计算机程序框图和主要化学存在形式含量的百分数随pH、碱度和铜浓度变化图。  相似文献   

Driving forces and their interactions of built-up land expansion based on the geographical detector – a case study of Beijing,China     

Hongrun Ju  Lijun Zuo  Jinfeng Wang  Shengrui Zhang  Xiao Wang 《International journal of geographical information science》2016,30(11):2188-2207

Scientific interpretation of the driving forces of built-up land expansion is essential to urban planning and policy-making. In general, built-up land expansion results from the interactions of different factors, and thus, understanding the combined impacts of built-up land expansion is beneficial. However, previous studies have primarily been concerned with the separate effect of each driver, rather than the interactions between the drivers. Using the built-up land expansion in Beijing from 2000 to 2010 as a study case, this research aims to fill this gap. A spatial statistical method, named the geographical detector, was used to investigate the effects of physical and socioeconomic factors. The effects of policy factors were also explored using physical and socioeconomic factors as proxies. The results showed that the modifiable areal unit problem existed in the geographical detector, and 4000 m might be the optimal scale for the classification performed in this study. At this scale, the interactions between most factors enhanced each other, which indicated that the interactions had greater effects on the built-up land expansion than any single factor. In addition, two pairs of nonlinear enhancement, the greatest enhancement type, were found between the distance to rivers and two socioeconomic factors: the total investment in fixed assets and GDP. Moreover, it was found that the urban plans, environmental protection policies and major events had a great impact on built-up land expansion. The findings of this study verify that the geographical detector is applicable in analysing the driving forces of built-up land expansion. This study also offers a new perspective in researching the interactions between different drivers.  相似文献   

Mixing of Enriched Lithospheric Mantle-Derived and Crustal Magmas: Evidence from the Habo Cenozoic Porphyry in Western Yunnan     

XIA Bin  LU Ye  YUAN Yajuan  CHEN Weiyan  ZHANG Xiao  XU Chi  YU Shengrui  WAN Zhifeng 《《地质学报》英文版》2018,92(5):1753-1768

New zircon U–Pb ages, whole-rock geochemistry and zircon Hf isotopes from the Habo porphyry Western Yunnan, China, were determined to provide constraints on the timing of uplift of the Eastern Tibetan Plateau. The intrusive rocks consist of shoshonitic porphyry (syenite porphyry and monzonite porphyry). Zircon laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) U–Pb dating indicates coeval emplacement ages of ~35 Ma. The porphyries have alkaline affinities, enrichment in large ion lithophile elements (LILEs) and light rare earth elements (LREEs) (e.g., Rb, Th, U, Pb), with depletion of high field strength elements (HFSEs) (e.g., Nb, Ti, Ta) and weak Eu anomalies. They display uniform Lu–Hf isotopic compositions with negative zircon εHf(t) values ranging from -3.9 to -0.6. The chemical characteristics of the syenite porphyries indicated that they most likely originated from the lower crust, with mantle-derived material involved in their generation. Geochemically, the monzonite porphyries are similar to the syenite porphyries; however, the lower MgO contents suggest that they were produced by different degrees of partial melting of the same lower crust source. Combined with the geochemical and isotopic data in this paper, imply that the alkali-rich porphyries of the Habo polymetallic deposit were derived from the partial melting of lower crust, enriched by mantle magma, formed in a conversion stage from stress extrusion (a strike-slip shear process) to local stress relaxation (a strike-slip pull-apart process) at the Ailaoshao tectonic zone.  相似文献   

四川稻城海子山方枝柏树轮宽度与气候因子的响应关系研究     

邹莉丽  徐姗姗  郑超刚  李生芮  连婉婧  商志远  张志刚  孔兴功  赵志军 《冰川冻土》2021,43(3):917-927

对四川稻城县海子山高原上的方枝柏进行树芯采集,经交叉定年后建立林线上限位置的方枝柏树轮宽度年表。标准化年表与气象资料的响应分析结果揭示了该地区树木生长主要受当年生长季前期温度条件的控制。轮宽指数与前一年9月到当年2月的平均气温呈显著正相关（R=0.56,P<0.01）。由此重建了该地区1850—2019年这170 a的前一年9月到当年2月平均气温的变化,转换函数方差解释量31.7%。重建结果与邻近地区树轮记录的温度变化具有较好的一致性。重建序列显示工业革命以来,研究区经历较冷的时期有：1870—1890年和1960—1980年;较暖的时期有：1884—1892年、1919—1925年、1940—1960年以及1980—2019年。1940—1960年是20世纪最暖的时期,20世纪60年代后温度呈现下降趋势,1980年开始气温保持持续升高,2010年之后气温有小幅下降。重建气温序列与太阳黑子数变化和北大西洋多年代际涛动AMO有较强的响应,揭示了太阳活动、海温等因子可能对该区温度变化产生重要影响。  相似文献   

东天山康古尔塔格金矿带成矿条件分析   总被引：4，自引：0，他引：4       下载免费PDF全文

姬金生  杨兴科  苏生瑞 《地质找矿论丛》1994,9(4):49-56

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Pollen assemblages and their environmental implications in the Qaidam Basin,NW China     

Shengrui Zhang  Qinghai Xu  Anne Birgitte Nielsen  Hui Chen  Yuecong Li  Manyue Li  Lingyun Hun  Jianyong Li 《Boreas: An International Journal of Quaternary Research》2012,41(4):602-613

The Qaidam Basin is one of the most sensitive areas to climate change in China, owing to its unique geographical position and ecological condition. In this study, 32 surface‐soil pollen samples were collected to reveal the relationship between modern pollen assemblages, vegetation and precipitation in the eastern region of the Qaidam Basin. The results show that Chenopodiaceae (3.8–87%, average 48%), Artemisia (1.7–64.2%, average 17.5%) and Ephedra (0–90%, average 16.3%) are the dominant pollen types in all samples, and that different pollen assemblages correspond to different vegetation types. DCA and CCA of major pollen types demonstrate that precipitation is an important factor in the control of the distribution of vegetation in the study area. The content and concentration of the three major pollen types (Artemisia, Chenopodiaceae and Ephedra) change with the mean annual precipitation, and the optimum mean annual precipitation for Ephedra, Chenopodiaceae and Artemisia is <80, 80–200 and >160 mm, respectively. Correlation analysis between the variation in grain size of the three major pollen types and the main environmental variables shows that the grain size of the three pollen types is positively correlated with precipitation in the Qaidam Basin. The results confirm that precipitation is the most important environmental factor in the Qaidam Basin, and that it has an important effect on pollen grain size in the study area.  相似文献   

渭河盆地的水系与现代构造运动     

苏生瑞 《地球科学与环境学报》1991,(1)

通过卫星象片解释、实地调查测量和查阅历史文献,本文较全面地研究了渭河盆地的水系及其所反映的现代构造运动特征。水系平面组合形态、渭河河型、水系转折及冲沟错位、河流密度、渭河河床的迁移、历史水涝灾害都一致地反映本区现代构造运动继承了第四纪以来的特点。水系历史演变又表明现代构造运动具有周期性。据水系错位和河流流向的统计分析确定本区现代构造应力场主压应力方向为N50°～60°E。本文最后还讨论了根据水系研究现代构造运动的意义以及应注意的问题。  相似文献   

对二郎坪群火神庙组物质组成的质疑与再认识     

姜常义  苏生瑞  张振飞  杨志华  赵太平 《地球科学与环境学报》1995,(2)

经研究证明，前人建立的二郎坪群火神庙组确有少量的亚碱性双峰式火山岩。这些火山岩零星地分布在几个地区，走向不连续，出露宽度一般为数百米。构成该组主体的是一条规模宏伟的侵入岩带，其岩石组合为辉长岩－闪长岩－石英闪长岩－斜长花岗岩－花岗岩，总体上表现为正序岩浆演化序列。这些侵入岩普遍经历了三个阶段的变形变质作用，即第一阶段为韧性变形；第二阶段为静态重结晶；第三阶段为带状褶劈理，表现了复杂而漫长的构造演化史。  相似文献   

甘肃桦树沟铁铜矿床地球化学及成因     

张连昌  姬金生  薛春纪  卢登蓉  苏生瑞 《地球科学与环境学报》1997,(4)

甘肃桦树为铁铜矿床地质、同位素地球化学、包裹体地球化学、同位素年代学研究表明，该矿床形成于震旦纪裂陷海盆环境，矿床成因属典型的热水沉积成矿。  相似文献   

Spatial distribution and influencing factors of interprovincial terrestrial physical geographical names in China     

Shengrui ZHANG  Yingjie WANG  Hongrun JU  Daichao LI  Lei FANG  Junhui QI  Yingying WANG  Tongyan ZHANG 《地理学报(英文版)》2018,28(12):1845-1859

The interprovincial terrestrial physical geographical entities are the key areas of regional integrated management. In this paper, we analyzed the spatial patterns of the interprovincial terrestrial physical geographical names (ITPGN) from three aspects: numerical features, spatial variance and spatial agglomeration. The influencing factors of the distribution of ITPGN and the implications for the regional management were further discussed. GIS technology was used to visualize the distribution of ITPGN, analyze the spatial agglomeration and the influencing factors of ITPGN. A total of 11,325 ITPGN, including 4243 water ITPGN and 7082 terrain ITPGN, were extracted from the database of “China’s Second National Survey of Geographical Names (2014-2018)”, and the mountain geographical names were the largest type in ITPGN. Hunan Province had the largest number of the names in China, and Shanghai had the smallest number of the names. The spatial variance of the terrain ITPGN was larger than that of the water ITPGN, and the ITPGN showed a significant agglomeration phenomenon in the southern part of China. In addition, the relative elevation and the population had an impact on the distribution of the ITPGN. The largest number of the geographical names occurred in the regions where the relative elevation was between 1000-2000 meters, and where the population was between 40-50 million. Based on the analysis, it was suggested that the government should take the ITPGN as management units, optimize management strategies based on the characteristics of different types of ITPGN, strengthen the naming of unnamed interprovincial terrestrial physical geographical entities and balance the interests in the controversial ITPGN. This study demonstrated that GIS and spatial analysis techniques were useful for the research of ITPGN and the results could provide targeted management suggestions to realize coordinated development in the interprovincial regions.  相似文献