皖南南陵地区砷菱铅矾的发现及初步研究     

王传田  方云如  杨晓勇  杨学明 《安徽地质》1999,(3)

皖南南陵地区首次发现砷菱铅矾, 砷菱铅矾主要产于交代石英岩的含金氧化带中, 多与石英连生。主要伴生矿物是自然金、辰砂。Ｘ 射线粉晶衍射、化学分析和光学测定手段对该矿物进行了初步的矿物学研究。  相似文献   

与火山—潜火山作用有关的浅成热液金(铜银)矿床流体成矿系统   总被引：3，自引：0，他引：3  

范宏瑞  谢奕汉  王英兰  杨学明  杨晓勇 《地质论评》1999,45(7):154-159

与火山—潜火山作用有关的浅成热液金(铜银)矿床可以分为低硫型和高硫型两个亚类,所对应的流体成矿系统分别为贵金属(地热)成矿系统和火山热液成矿系统。由于成矿位置和流体成矿过程不同,形成了各具特色的成矿元素组合、围岩蚀变特征和成矿类型。  相似文献   

秋茄缺绿和正常植株叶片的叶绿素含量和叶绿体结构     

陈小勇  林鹏 《台湾海峡》1999,18(1):113-116,T004

本文研究了秋茄正常和缺绿幼苗叶片的叶绿素含量和叶绿体结构,结果表明,缺绿植株叶片中叶绿素a,b及总量均远低于正常植株叶片,它们的含量均不到正常植株叶片的10％,缺绿叶片的叶绿体结构也与正常叶片存在着较大的差异,缺绿片叶绿体中没有基粒堆,几乎没有淀粉体,嗜锇体数目也比较少,但存在着类囊体。  相似文献   

仪器标定格值变化对钻孔应变观测数据的影响     

黄世源  唐小勇  贺曼秋  张涛 《地震地磁观测与研究》2017,38(3):122-127

以巴南地震台钻孔应变某一时段观测资料异常变化为例,指出观测仪器元件标定格值是影响钻孔应变观测数据的重要参数,与固体潮汐幅度成反比例关系,且格值变化也可能是改变钻孔应变趋势形态的一种因素。文中分析格值与应变观测数据之间的物理机制,校正恢复异常时段观测曲线,为钻孔应变异常干扰识别工作提供参考。  相似文献   

山东地磁台网受宁东高压直流输电干扰预处理质量分析   总被引：2，自引：0，他引：2  

林秀娜  曲保安  贾立国  陈传华  范晓勇  邢伟伟  袁倩  池国民 《中国地震》2018,34(1):141-149

为进一步提高山东地磁台网受高压直流输电干扰的预处理质量,通过中国地震前兆数据处理系统中相对差值检测和预处理检测功能,对山东地磁台网多年来受宁东高压直流输电干扰预处理情况进行了总结分析。结果表明,经过数据预处理,宁东高压直流输电干扰基本被去除,但仍然存在高压直流输电干扰误判、起止时间错判、干扰幅度计量不精确等问题。针对上述问题,对数据进行复核和校对,应用"缓变台阶"功能重新处理,并加强对H、D分量干扰特征的研究。  相似文献   

Hyperspectral estimation model of soil Pb content and its applicability in different soil types     

Tian  Shiqi  Wang  Shijie  Bai  Xiaoyong  Zhou  Dequan  Lu  Qian  Wang  Mingming  Wang  Jinfeng 《中国地球化学学报》2020,39(3):423-433

Acta Geochimica - In order to obtain Pb content in soil quickly and efficiently, a multivariate linear regression (MLR) and a principal component regression (PCR) Pb content estimation model were...  相似文献   

基于无人船测量系统的水下地形测量研究与应用     

许成义  孙栋  张金营  陈建忠  孙如瑶  沈孝永 《山东国土资源》2023,39(2):50-55

随着测深技术、GNSS技术、高精密传感器集成化的发展,无人船测量系统为水下地形测量提供了新的思路。结合山东省高密市王吴水库,探讨了无人船水下地形测量的作业流程,通过对比分析,选择最优测线间距获取数据,通过差值分析进行精度评价,数据处理后对成果进行展示。研究区结果表明,无人船测量系统基于单波束测深在中型水库中的应用是十分理想的,测深数据质量较好,能够很好地反映库区的水下地形情况,无人船测量系统在水下地形测量中起着重要作用。  相似文献   

Characteristics of Vegetation Carbon,Nitrogen, and C/N Ratio in a Tamarix chinensis Coastal Wetland of China     

Linping Xie  Baodong Wang  Ming Xin  Min Wang  Xiuping He  Qinsheng Wei  Xiaoyong Shi  Xia Sun 《洁净——土壤、空气、水》2019,47(9)

Variations in carbon (C) and nitrogen (N) of the vegetation in a Tamarix chinensis coastal wetland located in Laizhou Bay, China, are analyzed. It is found that T. chinensis accumulates more C and N than the surrounding herbs, and it allocates more C and N in the aboveground parts but less in the roots. Branches store more C, whereas leaves and flowers accumulate more N than other tissues. The C and N contents in the aboveground parts of T. chinensis are mainly influenced by pH, electrical conductivity (EC), water content, and clay content in the top 100 cm of soil as well as the distance from the sea. For the herbs, their C contents vary little in the supratidal zone, but they are higher than those in the intertidal zone. However, N contents in the herbs are higher in the aboveground parts and varied among different communities. The contents of C and N in the herbs are affected by EC, water content as well as the contents of organic C and total nitrogen (TN) in the top 10 cm of soil. The findings confirm that increasing the biomass of T. chinensis is an effective way to increase C sequestration in temperate coastal wetland.  相似文献   

典型喀斯特峡谷区碳储量空间分配格局、演变过程及其贡献率   总被引：1，自引：0，他引：1  

张斯屿  白晓永  王世杰  秦罗义  李盼龙  罗光杰  李月 《资源与生态学报(英文版)》2015,(4)

采用样方法和土地利用转移矩阵,以贵州省西南部的晴隆县为研究区域,研究了典型喀斯特峡谷区不同土地利用类型在1988、1999和2009年的碳储量空间格局和演变过程,并由此估算了贵州省喀斯特峡谷区的碳储量及贡献率。结果表明：晴隆县喀斯特区域的碳储量和平均碳密度呈先减少后增加的趋势。由晴隆县不同情况下的碳储量比例关系,估算出贵州省喀斯特峡谷区碳储量的实际值为42.55 Tg。同时,研究结果表明人类活动对碳储量的空间格局和演变有很大的影响。此外,估算的贵州省喀斯特峡谷区生态系统的平均碳密度远高于中国陆地生态系统的平均值,土壤平均碳密度则接近全国陆地生态系统平均值,但其植被平均碳密度却远高于全国陆地生态系统平均值,与全国森林系统的植被平均碳密度持平。这说明喀斯特峡谷区具有极大的固碳潜力,对其进行石漠化防治,是极其必要的。  相似文献   

Characterization of Chromophoric Dissolved Organic Matter (CDOM) in the Bohai Sea and the Yellow Sea Using Excitation-Emission Matrix Spectroscopy (EEMs) and Parallel Factor Analysis (PARAFAC)     

Ying Bai  Rongguo Su  Qingzhen Yao  Chuansong Zhang  Xiaoyong Shi 《Estuaries and Coasts》2017,40(5):1325-1345

Compositions and concentrations of chromophoric dissolved organic matter (CDOM) have been determined in the Bohai Sea (BS) and the Yellow Sea (YS) in the summer and autumn in 2013 by excitation and emission matrix spectroscopy (EEMs) and parallel factor analysis (PARAFAC). The PARAFAC model identified three humic-like components (C1, C2, and C3) and one protein-like component (C4). CDOM exhibited higher fluorescence intensities in the coastal areas in both the summer and autumn. However, its distribution patterns were different in the two seasons. Based on spatial and seasonal distributions of four components, as well as correlations with salinity, chlorophyll a (Chl-a), and apparent oxygen utilization (AOU), the following assignments were made. The C1, C2, and C3 components were mainly dominated by terrestrial inputs and influenced by the primary productivity of phytoplankton in the summer as well. C4 was assigned to terrestrial and autochthonous origins and most likely represented a biologically labile component. Terrestrial inputs were the dominant source of CDOM in the BS and YS. The humification index (HIX) and biological index (BIX) suggested that CDOM in the BS was more stable than that in the YS, which had an increase in autochthonous production, and in the summer, CDOM was less stable with a higher CDOM autochthonous production compared with that in the autumn.  相似文献