先秦时期海岱地区的麦作农业     

郭荣臻  靳桂云 《第四纪研究》2019,39(1):144-160

长期以来,学界对海岱地区先秦时期麦作农业的发展状况不甚明晰。得益于田野考古工作的开展,使用浮选、植硅体分析等植物考古方法收获了一批小麦、大麦遗存。通过对这些遗存的量化分析,发现龙山文化、岳石文化、商周时期皆有小麦存在;以龙山文化、周代所出小麦、大麦的遗址最多;龙山文化、商、周时期的小麦存在得到测年数据支持。进而得出结论:至迟在龙山文化时期,小麦作物进入海岱地区;岳石文化时期,先民对小麦的利用程度可能有小幅提高,但仍处在低水平利用阶段;商时期的植物考古工作尚少,麦类作物利用水平可能有所提高;两周时期麦作农业发展迅速,脱离了小麦种植的初级阶段,可能在一定程度上反证了商时期麦作的存在。大麦在周代的个别遗址的量化数值上升,并得到了测年数据支持,但大麦种植的相关问题有待进一步研究。麦作的发展,既与环境气候等自然条件相关,也是文化交流、技术发展、工具改良、政策支持的产物。小麦、大麦、马、牛和羊入华,促成了"史前食物全球化"的格局,海岱地区融入到"青铜时代全球化"的浪潮中,对本地农业、社会发展起到了重要作用,对后世历史产生了重要影响。  相似文献   

Provenance and tectonic setting transition as recorded in the Neoproterozoic strata,western Jiangnan Orogen:Implications for South China within Rodinia     

Jiawei Zhang  Taiping Ye  Yaran Dai  Jianshu Chen  Hui Zhang  Chuangu Dai  Guohua Yuan  Kaiyuan Jiang 《地学前缘(英文版)》2019,10(5):1823-1839

The Neoproterozoic Tonian strata(ca.870-725 Ma)in the western Jiangnan Orogen archive the records of sedimentary provenance and tectonic setting which can be used to understand the geological evolution of the South China Continent.These strata are separated into the basement and cover sequences by a regional angular unconformity.The basement sequence can be subdivided into the lower and the upper parts by the widespread interbedded ca.840 Ma basalt with pillow structure.In the present work,234 concordant detrital zircon analyses are obtained from three Tonian sandstone samples in the Fanjingshan district,Guizhou Province.Combined with previous results,a total of 1736 analyses of detrital zircon U-Pb ages derived from 12 formations of Tonian strata in the western Jiangnan Orogen are used to decipher the integrated sedimentary and tectonic histories.The zircons from the lowermost part of the basement sequence(the Yujiagou Formation)show oval morphology and display two Paleoproterozoic age peaks at 2325 Ma and 1845 Ma which are similar with the detrital zircon age peaks from the Late Paleoproterozoic to Early Mesoproterozoic Dongchuan/Dahongshan/Hekou groups,suggesting a passive margin basin in which the sediments were mainly sourced from the southwestern Yangtze Block.However,the zircon age population of the lower part of the basement sequence(the Xiaojiahe,Huixiangping formations and their equivalents)indicates the sedimentary derivation from bidirectional sources(the ca.870 Ma arc materials in the south and the old detritus from the southwestern Yangtze Block)which is consistent with a back arc setting for the deposition of the sediments.Zircons from the upper part of the basement sequence(the Duyantang Formation and its equivalent)show euhedral and subangular morphology and display a unimodal age peak at ca.835 Ma.This sequence was possibly deposited in a convergent setting and the detritus were came from the locally distributed syn-collisional igneous rocks.The lower part of the cover sequence(the Xinzhai and Wuye formations and their equivalents)shows a distinct zircon age peak at 815—809 Ma and two subordinate peaks at 2485 Ma and 2018 Ma,suggesting that the basin had gradually transformed into a continental rift basin and received the detritus from the ca.815 Ma post-collisional magmatic rocks as well as from different Paleoproterozoic source rocks in the northern Yangtze Block.We propose a tectonic evolution model that envisages eruption of ca.840 Ma basalt in a back arc basin that existed during ca.870-835 Ma,an angular unconformity was formed during amalgamation of the Yangtze Block and the Cathaysia Block at ca.835-820 Ma and the rifting of the South China Continent was initiated at ca.800 Ma.Our study concludes that the South China Continent was formed on the periphery of the Rodinia supercontinent.  相似文献   

秦巴山区自然条件与农业立体布局设计     

李锦秀 《山地学报》1991,(1)

本文从分析鄂境秦巴山区农业自然条件着手,着重论述光、热、水、土等农业自然条件对发展立体农业的有利因素和限制因素。在揭示自然结构分异特征的基础上,探讨划分山区农业自然资源地带,从而进行山区农业布局的宏观立体设计。  相似文献   

黄淮海地区乡村发展研究     

郭焕成  陆翔兴  卢丽君  杨柳 《地理研究》1990,9(2):130-137

黄淮海地区为我国重要的农业区。农村经济体制改革以来,本区乡村开始向现代化演进。本文分析了本区产业结构的演进过程和现状特征,乡村城镇化特点及前景,指出乡村发展面临的困境和出路。  相似文献   

我国地质勘查科技发展对策初探     

方先知 《湖南地质》2003,22(2):81-86

我国地质勘查正面临教从计划经济向社会主义市场经济、从传统地质勘查向以“地球系统科学”为核心的现代地质勘查、从以资源保障向资源环境保障并重、从“一种资源,一个市场”向“两种资源,两个市场”转变的重大变革时期,在此变革中,地质勘查科技水平的发展是至关重要的因素．为此,应从明确主攻方向,选准科技发展目标,加快矿业权市场建设,争取多渠道资金,加大对地勘方法技术研究的投资,加强科技创新人才培养,大力推进科研基地建设,制定和完善有利于推广先进技术的优惠政策,加强科研管理协作和加强国际交流合作等方面来推动我国地质勘查科技的发展．  相似文献   

民族植物学与新疆的经济发展和生态保护   总被引：4，自引：0，他引：4  

刘文江  潘伯荣  裴盛基 《干旱区地理》2003,26(3):223-226

1982年裴盛基教授首次将民族植物学的概念介绍给中国读者,建立了中国第一个专业研究机构,并率先在我国民族构成最多的云南省开展研究工作。过去20年间取得了惊人的发展和丰硕的成果。同时丰富和发展了民族植物学的概念。新疆作为中国最大的少数民族聚居区。具有独特的生态环境。同时民族文化又呈现特殊性和多样性;各少数民族在长期的生活、生产实践中在植物资源利用方面积累了丰富的经验和知识,如民族医药、引种栽培、园艺、畜牧、饲用等方面。因此,民族植物学研究在新疆这样一个少数民族地区具有重要的实践意义。将在新疆的经济发展和生态保护中发挥重要的作用。  相似文献   

东北区区域地层发育与地壳演化   总被引：2，自引：0，他引：2  

王友勤  苏养正 《吉林地质》1996,(Z1)

根据东北区地层发育总体特征，运用现代沉积学、大地构造学理论，对东北区的各个历史时期地层发育与地壳演化关系，进行了深入的讨论。  相似文献   

Application of AMD to the Determination of Crop Protection Agents in Drinking Water. Part IV: Fundamentals of a Confirmatory Test     

K. Burger  H. Jork  J. Khler 《洁净——土壤、空气、水》1996,24(1):6-15

A method is described for the determination of fifteen active ingredients of plant protecting products in ground-, raw, and drinking water. After extraction and enrichment of the pesticides from the water sample with solid-phase extraction, the extract is fractionated on silica-coated TLC plates, first in a so-called screening gradient by AMD (automated multiple development). The detection of the pesticides is performed by UV multidetection. Positive results from the first separation are confirmed by a second separation on silica in an AMD gradient of distinctly different selectivity, compared to the first separation. Following this strategy, it is possible to distinguish nearly all nonvolatile, from water extractable, active ingredients of plant protecting products in the market. UV spectra are taken for further confirmation of positive results. In most cases, this is possible even at the limit of determination. All chromatograms and spectra shown are raw data, resulting from the confirmatory test DIN 38407 part 11, in the laboratory of one participant*). The method is standardized in the meantime as DIN V 38407-11.  相似文献   

长山群岛水环境基本特征与水资源开发研究     

邓伟 《地理科学》1997,17(3):278-284

长山群岛特有的地质，地理环境肽其气候条件决定其水环境容量水，水资源有限。海岛区域开发协调发展的道路，水资源开发不应以损害水环境炒代价，必须走水资源持续利用的开发模式  相似文献   

1997年回归与港深管理线   总被引：2，自引：0，他引：2  

叶嘉安 《地理学报》1997,52(3):207-219

保持香港繁荣与稳定的重要性已在１９８４年的中英联合声明中得到保证。在１９９７年７月之后，香港将回归祖国而成为中国的特别行政区，并且实行“一国两制”５０年不变，从而保持香港现有的繁荣。本文旨在探讨港深管理线在香港成为特别行政区后对保持香港的繁荣和稳定 和香港于１９９７年回归后这条管理线及其接壤地区的规划问题。  相似文献