生态地球化学预测预警若干问题探讨   总被引：6，自引：0，他引：6  

周国华  田黔宁  孙彬彬  魏华玲  刘占元 《地质通报》2009,28(1):118-123

回顾了生态地球化学危害效应的作用机理,提出了区域地球化学调查-地球化学环境监测-机理研究相结合的生态地球化学预测预警基本思路。根据当前中国多目标区域地球化学调查和生态地球化学评价工作的现状,举例说明了土壤重金属元素累积、土壤环境变化、生态效应机理的若干研究方法,提出了预测预警成果体现的若干建议。  相似文献   

Temporal and spatial evolution of surface sediments characteristics in the Dagu River estuary and their dynamic response mechanism     

《China Geology》2019,2(3):325-332

Based on the 39 surface sediment samples collected in the flood season and the dry season in 2012 respectively and the measured hydrological data in October 2012, the sediment grain size characteristics has been analyzed and the response mechanism of surface sediments to estuarine hydrodynamics was revealed by calculating the range of waves and tidal currents. The results show that: (1) The grain size of the surface sediment samples decreased gradually from land to sea in the flood season. The fine sediment was redistributed under marine hydrodynamics in the dry season and the sediments showed coarser tendency ingeneral; (2) tidal current stirring sediment was very obvious in Dagu River estuary area, and wave stirring sediments mainly occurred in the tidal flat area and estuary sand bar area; (3) in the flood season, surface sediment sat the estuary were transported towards south and southeast. In the dry season, surface sediments were transported towards southwest at the north area of Jiaozhou Bay Bridge, and sediments were transported towards northeast area at the south of Jiaozhou Bay Bridge.  相似文献   

中国环境考古学的兴起、发展和展望          下载免费PDF全文

夏正楷  张俊娜 《古地理学报》2019,21(1):175-188

环境考古学是一门介于考古学与第四纪环境学(或古地理学)之间的边缘学科。它出现于20世纪之初,经过近1个世纪的摸索和实践,在理论和方法上日趋成熟。中国环境考古学出现较晚,但发展迅速,已经形成以人类生态系统理论为依据,以聚落和遗址古环境分析为主要手段,以探讨古代人类行为及其文化的形成、发展和演变的环境背景为目标的新型交叉学科。目前,它已经逐渐得到了中国考古学家的广泛认同,并成为考古学研究的重要组成部分,在涉及人类起源、MIS3阶段旧石器晚期文化革命、旧—新石器文化过渡以及农业起源、文明起源等一系列关键问题的研究中发挥着重要作用。  相似文献   

新疆和田普阳煤矿开采技术条件分析     

鲁艳平  祁斌 《中国煤炭地质》2019,(2):56-59

和田属南疆严重缺煤地区,布雅煤矿区是和田地区的主要煤产地。普阳煤矿含煤地层为侏罗系下统康苏组和侏罗系中统杨叶组。井田水文地质类型属孔隙、裂隙类简单型;工程地质类型属层状岩类复杂型;环境地质质量中等。  相似文献   

矿山环境治理过程中资金运作模式探索与实践     

田招龙  张雄邦  陈仕涛  何钰 《中国煤炭地质》2019,(2):77-81

矿山环境治理恢复基金制度之所以取代矿山地质环境治理恢复保证金制度,目的之一是通过基金的合理运营,为矿山环境治理提供长效稳定的资金保障。通过对矿山地质环境治理恢复保证金制度中的资金问题进行剖析,从基金来源、基金运营、基金投入三个方面提出矿山环境治理过程中新的商业运作模式,并从市场化角度对社会资本进入矿山复绿和综合利用进行了探索,以期对矿山环境治理恢复基金制度的建立提供一定的指导和参考。  相似文献   

宿南矿区不同时期塌陷塘水环境质量评价     

夏玉婷  桂和荣  李俊 《中国煤炭地质》2019,(3):45-52

以宿南矿区不同时期形成的采煤塌陷塘(芦岭塘、朱仙庄#1塘和#2塘)为研究对象,于2017年先后采集夏季和冬季水样,运用piper三线图、相关性分析、改进模糊综合评价法等,对其水环境质量进行分析评价与比较,得到以下结论:①芦岭塘、朱仙庄#1塘夏、冬两季水化学类型均为HCO_3―Na·Mg型,朱仙庄#2塘为SO_4―Na·Mg·Ca型。②三个塌陷塘水的TDS、pH、EC变化趋势为朱仙庄#1塘>朱仙庄#2塘>芦岭塘,其季节变化趋势均为夏季>冬季; ORP变化趋势为朱仙庄#2塘>芦岭塘>朱仙庄#1塘,其季节性变化趋势为冬季>夏季。③改进的模糊综合评价结果表明,三个塌陷塘夏季水质较差,主要受人为污染影响;冬季芦岭塘、朱仙庄#1塘水质良好,受污染小;朱仙庄#2塘冬季水质与夏季相近,均较差,主要受投加鱼食料的影响。  相似文献   

乌兰布和沙漠晚第四纪以来环境演化研究进展     

王娜  春喜 《中国沙漠》2022,42(1):175-183

乌兰布和沙漠晚第四纪以来环境演化呈现湖泊与沙漠多次反复的更替模式,湖相层与松散风成砂层迭覆出现.湖泊发育时间段为120-90 ka、60-50 ka、40-20 ka和8-5.5 ka;沙漠扩展时间段为150-130 ka、90-60 ka、50-40 ka、20-10 ka和5.5 ka--近现代时期.由于时空尺度差...  相似文献   

中国环境经济地理的研究主题展望     

贺灿飞  毛熙彦 《地理科学》2021,41(9):1497-1504

全球环境变化与技术经济范式变革对“经济-环境”关系产生深刻影响,但资源环境议题自20世纪80年代以来逐渐淡出全球经济地理研究的视野。2000年以来,环境经济地理逐渐兴起并对此进行反思,但其发展仍处于混沌状态。中国经济地理学科自身的人地关系传统和国家发展的探索与实践,为环境经济地理理论与实践创造了理想条件。环境经济地理并非全新的领域,其可从经济地理理论出发拓展对“经济-环境”关系的认识,据此提出3组研究主题：① 重新认识经济活动的区位,理解变化中的资源环境如何作用于传统与新兴经济活动;② 建立对不同地理尺度下要素流动和主体互动的认知,理解资源环境风险如何在各类关系网络中传递,又将如何重塑各类关系网络;③ 考察多主体在多区域之间、多层级制度背景下的相互作用,理解绿色创新与转型的过程,实现对“经济-环境”关系在不同发展场景下协同演化的认识。  相似文献   

The history of environmental change and adaptation in eastern Saloum–Senegal—Driving forces and perceptions     

Cheikh Mbow  Ole Mertz  Awa Diouf  Kjeld Rasmussen  AnetteReenberg   《Global and Planetary Change》2008,64(3-4):210

Environmental change in the Sahel–Sudan zone of West Africa has been a major issue in development debates over the last decades. Using remote sensing based land cover change analysis, archival data, national and international statistical data, and household interviews, we analyze the drivers of environmental change in Eastern Saloum in Central East Senegal as well as the local perceptions of these changes and adaptation. Being part of the ground nut basin, Eastern Saloum has witnessed rapid environmental degradation caused by the conversion of forest and savanna areas to agricultural land during the last 20–30 years and by a combination of decline in precipitation, soil degradation, a diversity of policies with little concern for the environment, fluctuating markets and population pressure. Farmers perceive the environmental change mainly as land degradation and poor soil fertility, though recent extensification of agriculture counters this effect and has led to increased vegetation cover in marginal areas. They identified erratic climate, agricultural policies, insufficient food production and desire to increase income as the main drivers of change in the area. We conclude that while climate variability has influenced environmental change in the area, various types of State interventions in agriculture and global market fluctuations appear to have been the main underlying causes of environmental degradation.  相似文献   

Variability Study of the SX Phoenicis Star BL Camelopardalis     

Jian-Ning Fu  Chao Zhang  Kanokwan Marak  Chayan Boonyarak  Pongsak Khokhuntod  Shi-Yang Jiang 《中国天文和天体物理学报》2008,8(2):237-244

New time-series photometric observations of BL Cam in the V band and white light were made during 2005 to 2007 at the Xinglong Station of China. The frequency analysis confirms two closely separated frequencies, 25.181 d-1 and 25.571 d-1, but the frequency of 31-32 d-1 reported in the literature was not detected in the new data. New times of maximum light were determined from both our light curves and those available on Internet, allowing a more comprehensive study of the O - C diagram, together with the times of maximum light in the literature. A new interpretation, including the period increasing before 1988 and decreasing since 1992 of BL Cam and the light-time effect in a binary system, looks plausible.  相似文献