黄河干流有机碳的时空分布特征   总被引：4，自引：0，他引：4  

刘冬梅  张龙军 《中国海洋大学学报(自然科学版)》2010,40(12)

通过2003-2009年多个航次对黄河干流DOC(溶解有机碳)和POC(颗粒有机碳))及相关参数的调查研究,结果表明:TSS(颗粒悬浮物)为91.42～8188 mg/L,POC为0.65～24.20 mg/L,POC%(POC/TSS×100%)为0.44%～2.21%,DOC为1.57～4.77 mg/L,有机碳沿程分布具有明显的空间特征.花园口水文年调查中有机碳含量与流量的季节变化密切相关.POC主要受冲刷影响,而DOC在不同季节分别体现出冲刷、稀释或浓缩效应.修建水库和调水调沙这2个显著的人为干扰活动对黄河有机碳的性质及输运产生了截然不同的影响:库区自生源对有机碳的贡献明显大于干流,DOC/POC为6.64～12.00,DOC是有机碳的主要形式,同时水库截流,颗粒物沉降降低了颗粒有机碳的输运量,而调水调沙却加强了有机碳的输运,该时期DOC/POC为0.01～0.47,POC是有机碳输运的主导形态.  相似文献   

浅谈铟、镉在大厂矿田的分布及综合回收前景     

卜国基 《南方国土资源》2000,13(1):37-40

大厂矿田锡石硫化物矿床中产出的富铟铁闪锌矿为世界所罕见,文章探讨该类型矿床铟、镉的分布规律,分析计算该金属保有地质储量及年产量,简介当前回收情况及展望综合回收前景.  相似文献   

油源对比常规方法的使用误区     

卢鸿  冯小杰 《地球科学与环境学报》2000,22(2):56-59

通过采用不同方法得出不同认识的三个实例 ,说明油气地球化学研究中较常采用的正相关系数法、分布指纹对比法以及碳同位素类型曲线法存在误区与使用不当之处 ,应该提倡采用多参数、多指标的散点图法以及多元统计分析等来进行油源综合对比  相似文献   

具有硅酸盐尘埃特征碳星的新的候选者   总被引：1，自引：1，他引：0  

陈培生  高衡 《天文学报》1994,35(4):443-447

本文根据红外天文卫星的宽波段测光及低分辨率光谱资料，给出了两颗新的可能具有硅酸尘埃特征的碳星及４颗可能的候选者。  相似文献   

TRANSFERABLE PHOSPHORUS IN SEDIMENTS OF THE HUANGHE RIVER ESTUARY ＇S ADJACENT WATERS   总被引：1，自引：0，他引：1  

宋金明 《中国海洋湖沼学报》2001,19(1):81-86

Based on a new idea for research on cycling of marine biogenic elements, this study showed that only the leachable form phosphorus in natural grain sizes manne sediments constitutes the transferable phosphorous in the sediments. The transferable phosphorus content in the natural grain sizes surface sediments in the Huanghe River estuary adjacent waters ranges from 58.5-69.8 μg/g, accounting for only 9.1%-11.0% of the total phosphorus content, whereas the leachable form (“transferable” )phosphorus content in the sediment after it was totally ground into powder was found to be 454.8-529.2μg/g, accounting for 73.4%-89.1% of the total phosphorus. Analysis of the correlation between thebill,ass of benthos and the leachable form (“transferable” ) phosphorus showed that most of the leachableform (“transferable”) phosphorus in the totally ground sediment did not participate in the marine biogeo chemical cycling. Furthermore, a synchronous survey on benthos showed that the biornass of meio-and maero-benthos exhibited good positive correlation with the leachable form of phosphorus in the naturalgrain sizes sediment, but peorer correlation with the leachable form (“transferable”) phosphorus in the totally ground sediment, indicating that transferable phosphorus in marine sediment is the leachable form of phosphorus in the natural grain sizes sediments, and is not the previously known leachable form(“transferable”) phosphorus obtained from the totally ground sediment.  相似文献   

中下扬子地区的壳幔结构及其与地震相关性的研究     

周国藩 《大地测量与地球动力学》1994,(4)

针对中下扬子地区人口稠密、经济建设蓬勃发展、而其地壳构造十分复杂、天然地震比较活跃的现实情况，以实测的地球物理资料与卫星重力异常等相结合，分析了该地区地壳构造和上地幔深部构造的基本特征，指出该地区中强震的形成和发生既有可能与地壳层中存在的低速带和高导层有关，还可能与更深部上地幔内部构造的背景因素有关。文中还提出了一些值得进一步探讨的问题。  相似文献   

农业生态的化学元素分类及其与作物优质高产的关系     

曾昭华 《国土资源导刊(湖南)》2001,20(4):277-283

利用国家科学技术成果,并根据国内外研究现状,将103个化学元素分成对作物生长发育、增产起显著作用、起一定作用、起有害作用和起未知作用4个农业生态元素类型,进而论述了它们与作物优质高产的关系.  相似文献   

DISSOLVED AND PARTICULATE ORGANIC CARBON IN YANTAI SISHILI BAY AQUICULTURE WATERS   总被引：2，自引：0，他引：2  

赵卫红王江涛  焦念志赵增霞 《中国海洋湖沼学报》2001,19(2):178-185

Investigation of dissolved organic carbon (DOC) and particulate organic carbon (POC) at 12 stations in Yantal Sishili Bay in May, August, and November of 1997 and March and May of 1998 showed that DOC concentrations varied from 1.14 mg/L to 5.35 mg/L; that the average values at all staticrLs ineach entise varied from 1.52 mg/L to 2.12 mg/L; that POC concentrafions varied from 0.049 mg/L to 1.411mg/L; and averaged 0.159 mg/L to 0.631 mg/L in each cruise. Horizontal distribution of DOC was influ-enced by factors such as continental input, organism activity, temperature, aquieulture environment, etc. The higher POC concentration occurred along the coast. The vertical distribution of DOC and POC changed obviously in spring and summer, but not obviously in autumn and winter. DOC concentration was highest in summer and POC in spring; both were lowest in winter. The seasonal change of DOC was con-sistent with primary productivity seasonal variation, and that of POC was consistent with ehlorophyll-a sea-sanal variation. The seasonal change trend of the C/N ratio of dissolved organic matter was obvious, but the C/N ratio of particulate organic matter had no such trend.  相似文献   

太古代碳库及其与金矿床流体源的关系     

Grov.  DL 严平兴 《国外铀金地质》1990,(2):34-37

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山西省挖金湾煤矿成煤特征     

刘雪梅 《华北国土资源》2006,(3)

煤的形成温暖湿润是必需的气候条件,由于各个成煤期植物遗体堆积的速度与地壳下沉的速度配合得非常好,加上成煤期后地质构造稳定,含煤地层受破坏不大,使大同形成了今日特有的双纪煤田.  相似文献