河南省淅川县单岗遗址两周时期动物资源的开发与利用     

尤悦  张建  孙凯  杨雅洁  靳松安 《第四纪研究》2020,(2):354-366

本文主要探讨河南省淅川县单岗遗址两周时期人类与家养动物之间的关系.该遗址两周时期发现13种动物,其中家养动物有猪、狗、马、黄牛、绵羊和山羊,家养动物的可鉴定标本数和最小个体数分别占全部可鉴定的哺乳动物数量的91.73%和70.67%.猪在家养动物中的数量最多,可鉴定标本数和最小个体数比例分别为69.04%和33.33%,其他家养动物的数量比例在1.78%~14.67%之间.家养动物提供了主要肉量,黄牛提供的肉量最多,占36.41%.马右P 2发现马衔磨蚀的痕迹,马第1节趾骨发现严重的骨赘,说明马被役用而且承担相当的工作量.马在普通聚落的出现、肉食消费和畜力开发等现象,反映马的功能从晚商时期贵族"御用"转向世俗化.  相似文献   

Three-dimensional finite element analysis of laterally loaded bridge caisson foundations in gravelly soil     

Chiou  Jiunn-Shyang  You  Jia-Qi 《Acta Geotechnica》2020,15(11):3151-3166

Acta Geotechnica - In this paper, we propose a three-dimensional finite element model that can simulate the caisson foundation behavior in gravelly soil. The soil model adopts a combination of the...  相似文献   

莒南县努力搞好土地开发整理工作          下载免费PDF全文

尤作中  陈笑云  孙钦梅 《山东国土资源》2005,21(10):23-24

莒南县地处鲁东南地区,东临日照市,西靠临沂市河东区,北接日照市莒县,南连临沭县,东南与江苏省交界.辖18个乡镇,937个行政村,99万人口,土地总面积1 755 km^2,耕地面积7.27万hm^2,列入国家、省、市土地开发整理的后备资源规划面积2.67万hm^2（40万亩）,土地后备资源开发潜力较大.  相似文献   

太湖水体和沉积物细菌群落分布格局及其驱动因素     

尤本胜  马书占  耿梦蝶  陈东强  操庆  王建军  顾炉华 《湖泊科学》2023,35(5):1774-1785

水体和沉积物是湖泊生态系统中迥异但又紧密相连的两类生境,栖息在这两类生境中的细菌在维持生态系统平衡和驱动元素循环中起着关键性作用。为了探究湖泊水体和沉积物细菌群落的分布格局,本文对太湖四个湖区水体和沉积物中细菌群落进行调查,基于高通量测序技术和统计分析手段,分析这两类生境中的细菌群落组成和多样性水平、分布特征及其驱动因素。结果表明:放线菌门(Actinobacteria)、变形菌门(Proteobacteria)和蓝细菌门(Cyanobacteria)是水体细菌群落中最主要的细菌门,而沉积物中Proteobacteria占据优势地位。在两类生境中,太湖西部区域细菌群落丰富度和独特性(LCBD)相对较高,各区域群落结构表现出显著性差异。对水体而言,电导率、pH值、PC1(重金属组成)和沉积物孔隙度是驱动细菌丰富度的重要因子,PC1、水温及pH值是影响细菌群落LCBD的重要因子,而细菌网络复杂性随pH值的增加而增加,且在高pH环境中占主导地位;对沉积物而言,其丰富度和LCBD的重要影响因子均是沉积物中总磷和锂,细菌网络复杂性随金属元素施加的环境压力增大而降低,但随总磷、磷酸盐和铵态氮浓度的...  相似文献   

Dynamics and driving mechanisms of asymmetric human water consumption during alternating wet and dry periods   总被引：1，自引：1，他引：0  

Fuqiang Tian  You Lu  Hongchang Hu  Wolfgang Kinzelbach  Murugesu Sivapalan 《水文科学杂志》2019,64(5):507-524

Increases in human water consumption (HWC) and consequent degradation of the ecological environment are common in arid regions. Understanding the mechanisms behind these processes is important for sustainable development. Analyses of changes in HWC between alternating wet and dry periods are carried out in four arid inland basins in Central Asia and China (Syr Darya, Tarim, Heihe and Shulehe river basins). Based on runoff records, the presence of an asymmetric HWC response is proved (p < 0.01), with an increase in HWC during wet periods and a muted decrease during subsequent dry periods. This behaviour is interpreted by invoking theories from behavioural economics at the individual and community levels. A simple model based on these theories is shown to be able to reproduce the observed dynamics and is used to discuss the importance of strengthening institutional factors for water sustainability.  相似文献   

A three-dimensional variational data assimilation system for a size-resolved aerosol model: Implementation and application for particulate matter and gaseous pollutant forecasts across China     

Wang  Daichun  You  Wei  Zang  Zengliang  Pan  Xiaobin  He  Hongrang  Liang  Yanfei 《中国科学:地球科学(英文版)》2020,63(9):1366-1380

A three-dimensional variational(3DVAR) data assimilation(DA) system is presented here based on a size-resolved sectional aerosol model, the Model for Simulating Aerosol Interactions and Chemistry(MOSAIC) within the Weather Research and Forecasting model coupled to Chemistry(WRF-Chem) model. The use of this approach means that both gaseous pollutants such as SO_2, NO_2, CO, and O_3 as well as particulate matter(PM_(2.5), PM_(10)) observational data can be assimilated simultaneously.Two one-month parallel simulation experiments were conducted, one with the assimilation of surface hourly concentration observations of the above six pollutants released by the China National Environmental Monitoring Centre(CNEMC) and one without assimilation in order to verify the impact of assimilation on initial chemical fields and subsequent forecasts. Results show that, in the first place, use of the DA system can provide a more accurate model initial field. The root-mean-square error of PM_(2.5), PM_(10), SO_2, NO_2, CO, and O_3 mass concentrations in analysis field fell by 29.27 μg m~(-3)(53.5%), 34.5 μg m~(-3)(50.9%),30.36 μg m~(-3)(64.2%), 8.91 μg m~(-3)(39.5%), 0.46 mg m~(-3)(47.4%), and 15.11 μg m~(-3)(51.0%), respectively, compared to a background field without assimilation. At the same time, mean fraction error was reduced by 42.6%, 53.1%, 45.2%, 43.1%,69.9%, and 48.8%, respectively, while the correlation coefficient increased by 0.51, 0.55, 0.48, 0.38, 0.47, 0.65, respectively.Secondly, the results of this analysis reveal variable benefits from assimilation on different pollutants. DA significantly improves PM_(2.5), PM_(10), and CO forecasts leading to positive effects that last more than 48 h. The positive effects of DA on SO_2 and O_3 forecasts last up to 8 h but that remains relatively poor for NO_2 forecasts. Thirdly, the influence of assimilation varies in different areas. It is possible that the positive effects of DA on PM_(2.5) and PM_(10) forecasts can last more than 48 h across most regions of China. Indeed, DA significantly improves SO_2 forecasts within 48 h over north China, and much longer CO assimilation benefits(48 h) are found in most regions apart from north and east China and across the Sichuan Basin. DA is able to improve O_3 forecasts within 48 h across China with the exception of southwest and northwest regions and the O_3 DA benefits in southern China are more evident, while from a spatial distribution perspective, NO_2 DA benefits remain relatively poor.  相似文献   

2004年冬季华北平原持续大雾天气的诊断分析   总被引：34，自引：8，他引：26  

康志明  尤红  郭文华  杨克明 《气象》2005,31(12):51-56

利用GTS1型数字式探空仪探测的资料、NCEP 1°×1°的6小时资料和常规观测资料,对2004年冬季华北平原历史上少见的持续大雾天气进行了天气动力学诊断分析。结果表明:华北平原近地面气层900hPa以下的负涡度平流、冷温度平流和弱辐合上升运动引起该层气温下降,900-500hPa的正涡度平流、暖温度平流和辐散下沉运动造成该层气温升高,在上升和下沉运动区的界面层中形成逆温层,逆温层的高度和强度影响雾的形成和状况。夜间辐射热力强迫作用和950hPa以下的微风是大雾形成的动力因子。大雾边界层中存在的水汽饱和层是在特定的环流形势下华北平原低空盛行东和东南向岸气流,将北部海面的水汽向西向北平流到冷近地面气层中的结果。  相似文献   

Ree geochemistry characteristics of stratigraphic samples in the abalieke region,Western Kunlun北大核心     

Shen N.-P.  Zhang Z.-W.  Peng J.-T.  Xiao J.-F.  Zhu X.-Q.  You F.-H.  Zhang Z.-S.  Wang F.-D. 《矿物岩石地球化学通报》2010,(4):388-399

The Abalieke region locats in the central section of the western Kunlun polymetallic (Pb, Zn, Cu, etc) ore belt, an area with major potential for further base metal deposit discoveries. This paper reports REE data for 82 samples from 8 stratigraphic sections for Huoshilafu formation in the Abalieke region. To attempt to solve the origin of ore-forming materials using REE geochemistry. Although total REE contents are quite variable ( Σ REE = 7. 52 × 10-6-220. 70 × 10-6, ΣLREE = 5. 82 × 10-6-198. 46 × 10-6, ΣHREE = 1. 49 × 10-6- 32. 74 × 10-6 and Y = 4. 77 × 10-6-91. 30 × 10-6) , chondrite-normalized REE patterns of the majority of samples are uniformly LREE-enriched (averaging ΣLREE/ΣHREE = 6. 57), with remarkably fractionation of LREE and HREE [averaging (La/Yb)N = 8. 20], slightly negative Eu anomalies (averaging δEu = 0. 77) and insignificant Ce anomalies (averaging δCe = 0. 88). The results demonstrate that REE characteristics of stratigraphic samples from Abalieke region are similar to those of rock and ore samples from other representative deposits (Tiekelike, Tamu, Kalangu, Tuokuziate) in the western Kunlun polymetallic ore belt, which indicate a close genetic relationship between the ore-forming materials and the host strata for the majority of deposits in this belt.  相似文献   

基于生态敏感性和生态系统服务的黑河中游生态功能区划与生态系统管理   总被引：1，自引：1，他引：0  

尤南山  蒙吉军 《中国沙漠》2017,37(1):186-197

生态功能区划是协调生态保护与经济发展的矛盾、实施区域生态系统管理的重要途径。以黑河中游为研究区,基于基础地理信息数据、自然地理数据和土地覆被数据（1986、1995、2000、2010、2011年）,在生态敏感性和生态系统服务重要性分析的基础上,以最小子流域为基本单元,运用二阶聚类法进行生态功能区划;并依据主导生态系统服务对研究区进行分区管理与生态调控。得出结论：（1）黑河中游生态系统类型以荒漠、草地和农田为主,占总面积的90%;森林、水域、城镇与农村居民点零星分布,所占面积不到10%;1986-2010年,农田经历了减少-扩张-再减少的变化,但城镇与农村居民点一直呈现扩张趋势;（2）西北部生态敏感性明显高于东南部,其中极敏感区（约占24%）主要位于张掖-临泽-高台平原北侧、合黎山、祁连山山前戈壁与荒漠、肃南明花区;高度敏感区（约占58%）分布于走廊中部冲洪积平原;（3）各生态系统服务重要性空间分布格局具有一定的相似性,非常重要和极重要综合服务功能区约占3.2%,位于走廊中部的黑河干流缓冲区内;中等和一般重要地区约占20%,分布在山丹和民乐境内祁连山、焉支山、龙首山附近;（4）黑河中游可分为祁连山森林草地生态区、走廊冲洪积平原农田生态区和走廊北部平原灌丛荒漠生态区3个生态区8个生态功能区,依其主导生态系统服务分为生态保育区、生态协调区和生态控制区3类,进而提出了对应的生态系统管理措施。  相似文献   

湖南省饮用天然矿泉水资源潜力评价与开发利用区划     

黄树春  赵帅军  夏友  刘志尧  曾艳华 《地质与资源》2017,26(1):67-72

湖南省饮用天然矿泉水资源丰富、水质优良.本文从区域地质条件、水文地质条件以及矿泉水资源现状几个方面来选取评价因子,利用层次分析法构建评价指标体系,运用综合指数评价模型对湖南省饮用天然矿泉水资源潜力进行评价,最后根据评价结果划分了石门-慈利、张家界-永顺、绥宁等11个矿泉水资源高潜力区,石门-花垣等14个矿泉水资源较高潜力区,以及中等潜力区和低潜力区.此外基于资源潜力评价结果,结合市场潜力和开发利用经济技术条件两个方面,最后将全省区划为张家界-永顺矿泉水分布区、益阳-韶山-湘潭等4个矿泉水优先开发保护区,石门-慈利、隆回、绥宁等12个矿泉水重点开发保护区,以及远景开发保护区和限制开发保护区.  相似文献