山东黄河下游地区局部生态地球化学评价方法与技术   总被引：3，自引：0，他引：3       下载免费PDF全文

庞绪贵  战金成  宋海林  藤兆令  李秀章  王增辉  代杰瑞 《山东国土资源》2006,22(5):28-33

山东黄河下游地区局部生态地球化学评价是在多目标区域地球化学调查和区域生态地球化学评价基础上,选特色农产品产地,绿色无公害蔬菜生产基地,地方病分布区及小清河沿岸、东营油气开采污染区等局部生态地球化学环境区。按一定的方法和采样密度采集土壤、浅层地下水、土壤溶液、植物根系土、籽实、土壤生物、微生物和种子库样品,分析As,Cd等重金属元素、N,B等有益营养元素、六六六、DDT等有机物和土壤微生物类群、功能、结构多样性,研究有益营养元素、重金属元素、有毒有机污染物的分布规律、赋存状态、来源及它们在土壤、水体及生物体中的迁移、转化、累积规律与生态效应,探讨对重金属元素污染的生物修复。提出特色农产品基地布局规划建议和地方病防治、重金属污染的治理措施。  相似文献   

Late quaternary chronology of the Taitao Peninsula,southern Chile     

Susie H. Lumley  Roy Switsur 《第四纪科学杂志》1993,8(2):161-165

Six new radiocarbon ages and a pollen sequence are provided for Laguna Stibnite, a small lake on the Taitao Peninsula, Chile (latitude 46°25'S, longitude 74°24'W). The sediments record a late-glacial to present sequence, with a basal age of 14 335 ± 145 yr BP (Q-2840). The radiocarbon ages provide the basis for a sound chronology in a region of Chile where few palynological studies have been made and where previous radiocarbon ages are ambiguous. The chronology from Laguna Stibnite supports the acceptance of a radiocarbon chronology based on wood fragments (rather than bulk analysis) at a site near Puerto Edén further south in the Chilean Channels (49°08'S). These data from Laguna Stibnite provide evidence for an early deglaciation (before 14 000 yr BP) in this region of southern Chile. The sequence provides no evidence for a climatic reversal between 11 000 yr BP and 10 000 yr BP, the so-called Younger Dryas chron.  相似文献   

山东省宁阳县东谷堆贫铁矿床地质特征     

李宗成  李先波  刘建生  杜英泉  亓西强  赵雪松  张峰 《山东国土资源》2005,(Z1)

宁阳县东谷堆铁矿化属晚期岩浆液态分异的熔离矿化,铁矿化体赋存于麻塔单元粗粒变角闪石岩内,矿床由3个矿化体组成,各矿化体相间分布,总体走向均为NW向。矿石自然类型有磁铁阳起角闪石岩、磁铁黑云角闪石岩。矿石矿物以磁铁矿为主,脉石矿物主要为角闪石。矿石具柱粒状变晶结构、鳞片变晶结构、包含结构,浸染状构造、块状构造。矿石品位低,全铁含量一般13.5%~16.5%,最高达19.76%。矿床平均品位TFe15.15%,SFe8.26%。矿化体裸露地表,适宜露天开采。矿石加工技术性能良好,采用二次精选,一次扫选半闭路式选矿工艺流程。选石结果为:精矿全铁含量62.10%,精矿率11%~12%,回收率31.40%。  相似文献   

山东省城市土地集约利用的对策研究     

闫整  高申 《山东国土资源》2006,22(9):44-47

“人多地少”的省情及对建设用地调控力度的不足,使国家对土地实行严控管理,使城市土地集约利用成为必然。为此,提出建立城市土地集约利用状况的评价制度与监控机制、实行项目控制和实施管理的规划对策,以保证城市建设用地集约利用的实现,使城市土地利用达到良好的经济、社会和环境效应。  相似文献   

汶上县兴化寺金矿地质特征     

李振峰  王自具 《山东国土资源》2001,(Z1)

对兴化寺金矿床地质特征、矿物组合、金的赋存状态、金的矿源层进行了研究 ,探讨了变质作用、岩浆作用及构造作用对金的活化、迁移、富集的影响。其矿化与绿岩带、韧性剪切带及燕山期岩浆活动关系密切。属多期次热液充填蚀变成因。  相似文献   

Geomorphic effectiveness of extraordinary floods on three large rivers of the Indian Peninsula     

Vishwas S. Kale   《Geomorphology》2007,85(3-4):306

The efficacy of extreme events is directly linked to the flood power and the total energy expended. The geomorphic effectiveness of floods is evaluated in terms of the distribution of stream power per unit boundary area (ω) over time, for three very large floods of the 20th Century in the Indian Peninsula. These floods stand out as outliers when compared with the peak floods per unit drainage area recorded elsewhere in the world. We used flood hydrographs and at-a-station hydraulic geometry equations, computed for the same gauging site or a nearby site, to construct approximately stream-power curves and to estimate the total energy expended by each flood. Critical unit stream power values necessary to entrain cobbles and boulders were estimated on the basis of empirical relationships for coarse sediment transport developed by Williams [Williams, G.P., 1983. Paleohydrological methods and some examples from Swedish fluvial environments. I. Cobble and boulder deposits. Geografiska Annaler 65A, 227–243.] in order to determine the geomorphological effectiveness of the floods. The estimates indicate that the minimum power per unit area values for all three floods were sufficiently high, and stream energy was above the threshold of boulder movement (90 W m^− 2) for several tens of hours. The peak unit stream power values and the total energy expended during each flood were in the range of 290–325 W m^− 2 and 65–160 × 10⁶ J respectively. The average and peak flood powers were found to be higher or comparable to those estimated for extreme palaeo or modern floods on low-gradient, alluvial rivers.  相似文献   

Environmental change and cultural response around 4200 cal. yr BP in the Yishu River Basin, Shandong     

GAO Huazhong  ZHU Cheng  XU Weifeng 《地理学报》2007,17(3):285-292

Neolithic culture series in the Yishu River Basin developed in the order of Beixin culture–Dawenkou culture–Longshan culture–Yueshi culture. During the early and middle stage of Longshan culture (4600–4300 cal. yr BP), the climate in the Yishu River Basin was warm and wet. Paddy-oriented agriculture planted paddy was very developed. The society was flourishing with great amount of archaeological sites. The cooling starting in 4200 cal. yr BP made the paddies shortfall in output or even no seeds were gathered. This situation in-tensified the discrepancy between population and resource. The scarcity in natural resource led to substantial decrease in population and subsequent drop in archaeological sites. About 4000 cal. yr BP Longshan culture was displaced by Yueshi culture which was relatively un-derdeveloped, simple and unsophisticated.  相似文献   

山东沂沭河流域2000BC前后古文化兴衰的环境考古(英文)     

高华中  朱诚  徐伟峰 《地理学报(英文版)》2007,(3)

Neolithic culture series in the Yishu River Basin developed in the order of Beixin culture-Dawenkou culture-Longshan culture-Yueshi culture. During the early and middle stage of Longshan culture (4600-4300 cal. yr BP),the climate in the Yishu River Basin was warm and wet. Paddy-oriented agriculture planted paddy was very developed. The society was flourishing with great amount of archaeological sites. The cooling starting in 4200 cal. yr BP made the paddies shortfall in output or even no seeds were gathered. This situation in-tensified the discrepancy between population and resource. The scarcity in natural resource led to substantial decrease in population and subsequent drop in archaeological sites. About 4000 cal. yr BP Longshan culture was displaced by Yueshi culture which was relatively un-derdeveloped,simple and unsophisticated.  相似文献   

潍北凹陷压力体系分布特征及成因分析     

李建军  朱天高  李政  朱日房 《沉积与特提斯地质》2007,27(1):92-96

潍北凹陷分为两个压力体系,北部洼陷带发育异常低压体系,实测的地层压力梯度为0.005~0.009MPa/m;南部地区为常压体系,压力梯度为0.0094~0.011MPa/m。研究结果表明,潍北凹陷异常低压力体系的形成既与古近纪的地层抬升和剥蚀作用有关,又与地温梯度的降低有关。地层水的浓差作用和流体的供排不平衡是形成潍北凹陷南北地区压力体系差异的主要原因。潍北凹陷地层压力系统演化经历了从异常高压至异常低压,再至压力分异的演化过程。  相似文献   

鲁南新元古代一个地震活跃期的地震幕次组合序列     

王炳山张宪依  梁兴泉李金波 庞成宝 《地质通报》2007,26(9):1198-1205

地震灾变事件的直接证据是地层中留下的特殊的沉积记录——震积岩。鲁南地区新元古界石旺庄组底部发育的一套碳酸盐岩泥晶脉、液化卷曲变形构造、丘状层理、砾屑层等典型的地震-海啸震积岩序列,表明本区新元古代曾有过一个持续很长时间的地震活跃期。依据其沉积组合规律,可以识别出7个地震幕,30余次地震。造成这一地震灾变事件的主要原因是古郯庐断裂带的早期裂陷作用。  相似文献