绿色农业视角下青海特色农业发展路径及对策

绿色农业是二十一世纪农业发展的理想模式。青海独特的地域环境和资源条件形成了丰富的特色农业资源,也为发展绿色农业奠定了基础。文章通过对青海特色农业绿色化发展条件的分析,指出了特色农业的发展目标,并提出了实施路径及相关对策。     

塔西佗历史书写中的“年代记”及其政治功能北大核心CSSCI

塔西佗以传统“年代记”体裁写作自奥古斯都到图密善统治时期的历史。他的历史探讨最深刻的人性与政治的关系,以此论证元首政体的好坏与统治者品性之间的联系。塔西佗的政治生涯大部分在图密善时代度过,在图拉真统治时期开始写作历史。图密善的暴政使他对历史写作持谨慎小心的态度,而暴政带来的影响使他希望通过历史写作给贵族阶层提供政治教诲,培育政治上的审慎美德,以便服务于国家。历史写作上的谨慎和提供教诲的愿望,使他放弃了当时流行的皇帝传记体裁而选择传统“年代记”体裁。尽管“年代记”与皇帝传记一样,都把皇帝作为叙述中心,但塔西佗研究的重点是皇帝的统治技巧、计谋和贵族阶层对此的回应,这种叙述体裁的选择因而也是其写作意图的组成部分。     

Spatial and temporal variety of prehistoric human settlement and its influencing factors in the upper Yellow River valley,Qinghai Province,China

We report an investigation of forty-two prehistoric sites in the upper Yellow River valley located in Guide, Jianzha, Hualong, Xunha and Minhe, Qinghai Province, China, including forty-four new radiocarbon dates from twenty-four sites, review published archaeological surveys and radiocarbon dates, analyze landform features and discuss the reasons for spatial and temporal variety of regional prehistoric human settlement. Our results suggest that people occupied the upper Yellow River valley during the early Holocene, but a continuous archaeological record begins only after about 5500 Cal yr BP. Thereafter, the intensity of prehistoric human settlement in the area is varied. Neolithic human settlement spread northwestward to high altitude areas of the upper Yellow River valley during early-mid Majiayao and Qijia periods, but moved southeastward to lower locations in the area during late Majiayao period. During the Bronze period, two coeval archaeological cultures, the Kayue and Xindian, occupied the upper Yellow River Region. Kayue archaeological sites are numerous and widely distributed in the high areas of the upper Yellow River, while Xindian sites are restricted to the lowest basin of the region. Variation in site density and location are likely the result of changing paleoclimate and technology.     

Thermochemical and bacterial sulfate reduction in the Cambrian and Lower Ordovician carbonates in the Tazhong Area,Tarim Basin,NW China: evidence from fluid inclusions,C, S,and Sr isotopic data

Petrographic features, C, O, S, and Sr isotopes were determined, and fluid inclusions (FI) were analyzed on various stages of vug‐ and fracture‐fillings from the Cambrian and Lower Ordovician reservoirs in the Tazhong area, Tarim basin, NW China. The aim was to assess the origin of pyrite and anhydrite and the processes affecting sulfur during diagenesis of the carbonates. Pyrite from seven wells has δ³⁴S values from ?22‰ to +31‰. The pyrites with low δ³⁴S values from ?21.8‰ to ?12.3‰ were found close to fracture‐filling calcites with vapor‐liquid double‐phase aqueous fluid inclusions homogenization temperatures (FI‐Th) from 55.7 to 73.2°C, salinities from 1.4wt% to 6.59wt% NaCl equiv and δ¹³C values from ?2.3‰ to ?14.2‰, indicating an origin from bacterial sulfate reduction by organic matter. Other sulfides with heavier δ³⁴S values may have formed by thermochemical sulfate reduction (TSR) during two episodes. The earlier TSR in the Middle and Lower Cambrian resulted in pyrites and H₂S having δ³⁴S values from 30 to 33‰, close to those of bedded anhydrite and oilfield water (approximately 34‰). The later TSR is represented by calcites with δ¹³C values as light as ?17.7‰ and FI‐Th of about 120–145°C, and pyrite and H₂S with δ³⁴S values close to those of the Upper Cambrian burial‐diagenetic anhydrite (between +14.8‰ and +22.6‰). The values of the anhydrite are significantly lighter than contemporary seawater sulfates. This together with ⁸⁷Sr/⁸⁶Sr values of anhydrite and TSR calcites from 0.7091 to 0.7125 suggests a source from the underlying Ediacaran seawater sulfate and detrital Sr contribution.     

南北朝的客馆及其地理位置

客馆为传统中国外交上的重要机构,由地主国设立,以接待归附者、使节、人质、入朝藩王、沙门与留学生等各种不同身分的外国人,试图落实招抚荒远、万国宾服的理想。南北朝时,客馆在数量与规制上有明显的发展,它除了解决外国人的食宿需求,也是重要的外交折冲场所。南北朝的客馆乃是拥有许多馆舍,颇具规模的馆区。客馆的方位受到城市格局变化的影响,南北朝以后,多位于城南。其地理位置也从城郭外向宫城靠近,且通常位于南北中轴线的通衢上。     

甲骨缀合三十五则

本文研究的是甲骨缀合 ,共缀合甲骨 3 5则     

清朝的人口迁移及其社会经济影响

清朝人口迁移规模巨大有两个独特的原因:一为清朝人口的快速增长;二为清朝赋税制度的改革,实行摊丁入亩,使人民获得自由.人口迁移的方向也不同于前朝,总趋势是从中原、江南等人口稠密区向人口稀少的边疆、山区、海岛迁移.清朝的人口迁移缓解了人口相对过剩的压力,使先进的生产技术和生产方法得当传播,有利于经济发展.从而对当时的社会产生了广泛的影响.     

钟嵘《诗品》评陆机"不贵绮错"文献考辨

钟嵘<诗品>卷上评陆机云:"其源出于陈思.才高词赡,举体华美,气少于公斡,文劣于仲宣,尚规矩,不贵绮错,有伤直致之奇.然其咀嚼英华,厌饫膏泽,文章之渊泉也.张公叹其大才,信矣."对于其中的"尚规矩,不贵绮错,有伤直致之奇"一句,历来注家多有争议,尤其是"不贵绮错"一语,更是令学者们颇费思量.如周振甫<诗品译注>译为:"看重规矩,不看重绮丽交错,有损害直接安排的技巧."①赵仲邑<钟嵘诗品译注>译为:"他的诗崇尚规矩,不以绮文交错为贵,有伤直抒胸臆的奇致."②萧华荣<诗品注译>译为:"崇尚古诗的法度规范,而不重视错综变化,损伤了作品的直率自然之美."③然而,结合陆机五言诗写作的实际情况来看,说他"不贵绮错",似乎是不能令人信服的.所以,对于这样的一些解释,韩国学者车柱环提出了自己的看法.