Exploration of Eco-economic Development in Ecological Fragile Region——A Case Study on Wuqi County in Shaanxi Province

[Objective] The aim was to explore eco-economy in ecological fragile region with Wuqi County in Shaanxi Province as an example. [Method] Eco-economy development and major environmental problems in Wuqi County in Shaanxi Province were researched based on local social and economic conditions, population of impoverished people and environment vulnerability. [Result] The areas with vulnerable environment and backward economy should establish a virtuous circle between economy and environment and a sustainable model of economic development. [Conclusion] It is significant to change the severe situation of environment deterioration and to promote ecological civilization.

On the Genesis of the Super-large Baguamiao Gold Deposit in Fengxian County, Shaanxi Province

The Baguamiao gold deposit in Fengxian County, Shaanxi Province, is a recentlyexplored super-large gold ore deposit. A comprehensive and deep-going study has revealedthat it is a polygenetic deposit: early-stage mineralization due to shearing, middle-stagemineralization due to hydrothermal alteration, and late-stage mineralization due toweathering, leaching and concentration at shallow depths. Shearing played a dominant role inthe formation of gold orebodies.

Current situation and human health risk assessment of fluoride enrichment in groundwater in the Loess Plateau:A case study of Dali County,Shaanxi Province,China

This study aims to investigate the mechanisms and health risks of fluoride enrichment in groundwater in the Loess Plateau,China.By taking Dali County,Shaanxi Province,China as an example,this study obtains the following results through field investigation and the analyses of water,soil,and crop samples.(1)The groundwater can be divided into two major types,namely the Quaternary pore-fissure water and Karst water.The Karst area and sandy area have high-quality groundwater and serve as the target areas for optional water supply.The groundwater in the study area is slightly alkaline and highly saline.Meanwhile,high-fluoride groundwater is mainly distributed in the loess and river alluvial plains in the depression area of the Guanzhong Basin and the discharge areas of the groundwater,with the highest fluoride concentration exceeding seven times the national standard.(2)Fluoride in groundwater mainly originates from a natural source and human activities.The natural source refers to the fluoride-bearing minerals in rocks and soil,and the fluoride from this source is mainly controlled by natural factors such as climate,geologic setting,pH,specific hydrochemical environment,ion exchange,and mineral saturation.Human activities in modern life can be further divided into industrial and agricultural sources primarily.(3)The health risks of fluoride contamination are very high in the Loess Plateau,especially for children compared to adults.Meanwhile,the risks of fluoride exposure through food intake are higher than those through drinking water intake.The authors suggest selecting target areas to improve water supply and ensure the safety of drinking water in the study area.Besides,it is necessary to plant crops with low fluoride content or cash crops and to conduct groundwater treatment to reduce the fluoride concentration in drinking water.These results will provide a theoretical basis for safe water supply in the faulted basin areas in the Loess Plateau.

The Taxonomic Status of Spermophilus in the Plague Area of Dingbian County,Shaanxi Province,China

This study was conducted to define the taxonomic status of Spermophilus in the plague area of Dingbian County in Shaanxi Province,China,through the two-factor variance analysis of morphological characteristics,DNA barcoding,and chromosome karyotype analysis.

The Research on the Status of Small-and-Medium-Sized Enterprises of County in the Dominant Industry of Shaanxi County Economy

The thesis analyzes the role of small-and-medium-sized enterprises of county in promoting county economy:the small-and-medium-sized enterprises of county become the material basis of developing production and boosting county economy;the small-and-medium-sized enterprises of county become the main channel of increasing farmers' job opportunities and realizing affluent life;the development of the small-and-medium-sized enterprises of county become the propeller of development of urbanization and county economy;the development of the small-and-medium-sized enterprises of county creates excellent conditions for the construction of modern agriculture.The thesis indicates that the low level of county industrialization is the principal factor impeding the county economy of Shaanxi Province and it also analyzes the opportunities and challenges when quickening the development of county industry.The countermeasures of developing small-and-medium-sized enterprises are put forward as follows:raise the awareness and determine the concept of using industry to make county powerful;build scientific planning and outline of county enterprise development to propel the innovation of developing and operating system of county enterprise;create beneficial conditions and reinforce the degree of county enterprise support entrepreneurship;take the park construction as vehicle and reinforce the degree of attracting investments from overseas;take the autonomous innovation as the impetus and develop the recycling economy;improve and optimize the service environment so as to create an excellent investment environment for enterprise.

Factors Controlling Precipitation of Barite and Witherite and Genesis of the Ankang-Xunyang Barium Deposits,Shaanxi,China

The barium deposits in Ankang and Xunyang counties,Shaanxi Province,China,occur in the northernmost part of the world-class barium metallogenic belt in south Qinling.The deposits are hosted by the Lower Silurian carbonaceous siliceous rocks,with a unique combination of barite and witherite.The homogenization temperatures of fluid inclusions in the barite are mainly concentrated between 135 and 155 ℃,whereas those from the witherite have two peaks of 165-175 ℃,and 215-225℃,respectively.Laser Raman analysis of fluid inclusions indicates that the vapor phase of fluid inclusions in barite is dominated by H_2O,although some contains N_2,H_2S,and CH_4.The compositions of the vapor and liquid phases of fluid inclusions in witherite can be divided into two end-members,one dominated by H_2O without other volatiles,and the other containing CH_4,C_2H_6,C_3H_8,C_2H_4,and C_6H_6 in addition to H_2O.CO_2,H_2S,and some CH_4 are interpreted as products of chemical reactions during mineralization.Organic gases（CH_4,C_2H_6,C_3H_8,C_2H_4,and C_6H_6） in the fluids were critical in the formation of barium sulfate versus carbonate.The δ^（34）S values of barite range from 38.26‰ to54.23‰（CDT）,the δ^（34）S values of sulfides coexisting with barium minerals vary from 22.44‰ to25.11‰（CDT）,and those in the wall rock from 11.60‰ to 19.06‰（CDT）.We propose that the SO_4^（2-）generally experienced bacterial sulfate reduction in seawater before mineralization,and some SO_4^（2-）also experienced thermochemical sulfate reduction in hydrothermal system during mineralization.The δ^（13）C values of witherite range from-27.30‰ to-11.80‰（PDB）,suggesting that carbon was sourced from organic substances（like CH_4,C_2H_4,and C_2H_6）.The formation of witherite was possibly associated with thermochemical sulfate reduction,which caused the consumption of the organic gases and SO_4^（2-） in the hydrothermal solutions,consequently inhibiting barite formation.The important conditions for forming witherite include high fluid temperatures,high Ba^（2＋） concentrations,CO_2 in the fluids,low HS^- concentrations,and the subsequent rapid diffusion of H_2S during thermochemical sulfate reduction of the fluids.

旅游型传统村落用地与空间格局演变微尺度分析——以陕西省礼泉县袁家村为例

以陕西省礼泉县袁家村为例,基于Google Earth高精度遥感图像,运用参与式乡村评估、ArcGIS空间分析、空间句法等方法分析乡村旅游发展中村庄用地功能及村庄空间格局的演变,探讨旅游干预对村庄空间格局的影响。结果表明:(1)2002—2022年袁家村空间格局发生明显变化,表现为土地利用类型由村民生活生产主导转变为旅游发展所需,致使村庄空间结构由村民居住空间为中心的单核心放射状转向旅游空间为主的多核心密集型;(2)乡村旅游促使空间关系网络趋向复杂化,同时在土地功能细碎化过程中村庄交通空间的稳定性和空间结构主导性凸显;(3)袁家村空间格局演变受市场需求和政府调控等多方面因素推动,村民的积极响应和空间功能的理性更新是其中关键作用力。

1936年:环县在中国共产党历史上重要地位的确立

1936年在中国共产党的历史上是比较重要的年份,中央红军先后进行了东征和西征,三大主力红军在甘肃、宁夏会师,抗日民族统一战线初步形成,红军取得了山城堡战役的胜利。这一系列事件中环县扮演着重要的角色。6月西征战役开始不久,中国共产党提出把以环县洪德城为中心的新苏区建成“西方根据地的重心”,陕甘宁省成立后省委和省政府迁移到今环县洪德镇河连湾村,使河连湾村成为新苏区的枢纽,起到了“西方根据地的重心”的作用。10月,红一、红二、红四方面军在会宁和将台堡分别会师后,继续进行战略转移,充分说明红军长征还在继续。11月下旬,红军三个方面军互相配合取得了山城堡战役的胜利。山城堡战役胜利标志着红军长征最终结束,山城堡应是红军长征的结束地。

基于DEA模型的陕西县域电商扶贫效率测度及空间特征研究

农村电商作为助力乡村振兴的新引擎,测度电商扶贫效率及其空间特征分析对推进乡村振兴具有重要意义。提出一种基于数据包络分析的县域电子商务扶贫效率测度方法,对陕西省84个县域进行静态测算,并分析其空间特征。研究结果显示陕西关中、陕北、陕南地区84个县域的电商扶贫综合效率均值为0.613,陕西大部分区县电商扶贫综合效率较低,陕北地区的电商扶贫综合效率最高,与关中、陕南的电商扶贫效率差距较大。陕西县域电商扶贫存在发展不均衡的问题。在空间特征方面,在陕西各县域,电商的发展还处于较为初级的阶段,未能形成相似的产业集群。鉴于此,根据不同县域电商扶贫效率的特点,提出了促进电商扶贫发展的意见和建议。

黄土丘陵沟壑区村庄生态系统服务对人类福祉的影响机理——以陕西省米脂县为例

[目的]在生态脆弱区,探究村庄生态系统服务对人类福祉的影响机理,为推动区域可持续发展提供参考。[方法]以黄土丘陵沟壑区陕西省米脂县为例,基于生物物理指标、人类需求理论分别评估村庄服务与福祉,分析了两者的空间分布。基于结构方程模型揭示了村庄禀赋视角下村庄服务对福祉的影响机理。[结果](1)作物和肉类空间分布相近,水果供给呈集中分布;高土壤保持村庄分布于南部丘陵,水源涵养和生境质量均西部高于东部;景观美学东部高于西部,高休闲娱乐村庄集中于城镇区。(2)村庄各需求、福祉空间分布差异较大。高福祉村庄包括川道村、多数乡镇中心村、乡村振兴示范村;低福祉村庄主要位于东西部丘陵,需政府重点关注。(3)村庄服务对福祉产生正向影响,作物、肉类、水源涵养是影响村庄福祉的关键服务。村庄禀赋对服务、福祉产生正向影响,且村庄禀赋通过提高村庄ES间接改善村庄福祉水平。高程是关键的自然禀赋,非文盲率和老龄化率是关键的社会禀赋;距县城距离是关键的区位禀赋。[结论]村庄服务与福祉空间差异明显,禀赋—服务—福祉的影响路径显著。依据空间差异与路径差异施策,是提升生态系统服务福祉贡献的要求。

灾害冲击下旅游地农户生计韧性评估与障碍因子诊断——基于陕西省礼泉县袁家村的农户调查

后疫情时代,有效测度旅游地农户生计韧性,对提升农户生计抗风险能力具有重要意义。从能动性视角切入,重新修正灾害冲击下农户生计韧性的理论框架,以陕西省礼泉县袁家村为案例地,测度不同生计类型农户的生计韧性水平并诊断其障碍因子。结果表明:(1)不同生计类型农户的生计韧性水平由高到低依次为商贸生计型、旅游生计型、均衡生计型、务工生计型、务农生计型;(2)灾害冲击下影响旅游地农户生计韧性的主要障碍因子为亲属担任村干部、机遇判别、寻求新机会、收入多样性与社会组织参与;(3)农户在灾害冲击下表现出的较强生计韧性与袁家村突出的组织特征与产业特征有着重要的关系。

县域尺度下陕西省干旱灾害韧性时空演变特征及障碍因子分析

本文依据灾害发展过程视角选取指标构建干旱灾害韧性评价体系,以熵权TOPSIS计算指标权重、构建评价模型;运用Kernel密度估计、ESDA、K-means聚类、障碍度模型等方法,定量分析2000—2022年陕西省县域干旱灾害韧性时空演变特征及其障碍因子。结果表明:①陕西省县域干旱灾害韧性整体与分项韧性呈阶段性上升趋势。②干旱灾害韧性呈现“中间高南北次之”的空间分布特征,大体呈现金字塔—橄榄型—倒梯形—倒金字塔的演变特征;呈现较为显著的空间集聚特征,H—H型分布在关中地区,L—L型分布在陕北地区;抵御—吸收—恢复三项韧性均较强的“综合型”区县逐渐增多。③恢复韧性是影响县域干旱灾害韧性的主要准则层障碍因子;政府防灾资金投入、农林牧副渔产值与人均可支配收入等分别对干旱灾害抵御韧性、吸收韧性和恢复韧性存在显著影响。

基于数字岩芯的致密砂岩储层孔隙结构精细表征与评价

致密砂岩储层微观孔隙结构十分复杂,定量化表征难度较大。针对此问题,选取陕西榆林市府谷县天生桥二叠系下石盒子组八段的辫状河露头的8个典型样品,利用图像滤波、阈值分割、最大球等效算法等对选取的数字岩芯代表性体积元进行处理。建立了岩样的三维孔隙结构模型以及球棍模型,计算了微观结构参数,定量表征了致密砂岩储层孔喉大小分布及其连通性特征,并结合评价地质方法开展了微观孔隙结构定量评价。研究表明:(1)基于孔隙直径将孔隙分为P1~P44类,分别对应微、小、中和大孔。对差异较大的1号和8号两个典型样品进行详细分析,结果表明1号样品以小孔和中孔为主,8号以中孔为主。(2)基于喉道半径分为R1~R44类,大体对应弯片状、片状型喉道、缩紧型喉道和孔隙缩小型,1号样品以弯片状和片状为主,8号以孔隙缩小型为主。(3)开展了微观孔隙结构定量评价。基于分形维数、形状因子、欧拉数、连通率、视孔隙度和孔喉结构类型等参数,分为Ⅰ、Ⅱ、Ⅲ、Ⅳ4级对8个样品进行了分级评价,取得了较好的评价效果。因此,数字岩芯技术从其强大的三维成像能力、数据处理能力等验证了能精确定量表征致密砂岩储层三维孔隙结构,可为致密砂岩油气资源评价与产能提供地质依据。

基于IOE-IV耦合模型的地质灾害易发性评价——以陕西省城固县为例

地质灾害易发性评价是地质灾害排查、风险性调查评价及预警预报工作的基础,其成果可以作为建设工程是否进行地质灾害危险性评估工作的依据。因此,进行区域地质灾害易发性评价研究显得尤为重要。本文以城固县为研究区,以气象水文类、地形地貌类、基础地质类、植被覆盖类共4类12种诱发因素为评价指标。分别采用K-means算法、FCM算法、层次聚类算法、DBSCAN密度算法对区内126处地质灾害样本数据进行分析提纯,剔除13处样本噪声点。利用提纯后的113处样本点建立IOE-IV耦合模型,并对城固县地质灾害易发性进行分区评价,评价结果表明:(1)地质灾害极高—高易发区、中易发区、极低—低易发区的占比分别为92.04%、4.42%与3.54%,预测结果较合理准确;(2)地质灾害发育主要受高程、水系的控制,在高程412~500 m、距水系小于500 m范围内主要为极高—高易发区,地质灾害呈线状发育。研究成果可以为地质灾害易发性评价样本优化、模型选择提供一定的理论依据。

陕西省重点生态功能区绿色高质量发展研究——“两山”理念的陕西实践研究

生态文明建设是中华民族永续发展的根本大计。本文立足习近平生态文明思想,围绕“两山”理念的陕西实践研究背景,系统梳理了陕西省6大重点生态功能区的类型基础、功能特征、发展现状,着重分析了以50个县(市、区)为基本单元的陕西省重点生态功能区,在探索实践“两山”理念中存在的突出问题、主要原因与解决方法。为陕西省根据关中、陕北、陕南差异化比较优势,把握秦岭创建国家公园战略机遇与生态产业化、产业生态化发展趋势,统筹实施区域协调发展、可持续发展、能源安全等国家战略与黄河流域生态保护和高质量发展区域重大战略,加快构建以县域为基础的区域现代生态经济体系,带动乡村振兴,推动实现绿色高质量发展,形成富有陕西特色的“绿水青山就是金山银山”,提供政策启示参考。

岐山县某矿山地质环境现状及监测方案

岐山县某矿矿业开采引起的矿山地质环境问题种类较多,主要有开采境界周边形成的边坡可能产生崩塌、掉块等地质灾害问题,矿山工程建设、采矿活动对地形地貌景观的破坏及露天采场、工业场地、矿山道路等对土地资源的压占与挖损。基于矿山地质环境现状,从监测内容、监测方法、监测网布设及监测频率等方面对矿山开采过程和土地复垦效果进行监测,提出相应的监测方案。

居延汉简中的陕西地名研究

居延汉简记录了大量的古代地名。考查这些地名,对研究古代政区因革、地名存废,乃至文化演进、制度变迁,都具有重要意义。载有陕西地区地名的39枚简牍中的39则简文,蕴含大量的汉代历史和文化信息。它记录了一些县名在书写时使用通假字的史实(如祋祤写作带羽,云阳写作霣阳);大量的里名为今人提供了已经消失的古地名线索。里名大都具特定含义,有描述性的,亦有记述性的,许多里名还被赋予道德引领的价值理念。众多地名和戍卒档案资料显示,汉代陕西地区除上郡外大量向河西地区征调戍卒,这与史家所谓“戍卒大部分是关东人,少数是本郡人”的观点不完全一致。简文中有关法律和戍卒身份、职衔、装备的史料,有的可弥补史书记载之不足。

不同烤烟品种在陇县烟区的适应性研究

为筛选适合陕西陇县烟区的烤烟新品种,2023年在陕西省宝鸡市陇县曹家湾镇流渠村对10个品系的生育期、植物学性状、农艺性状、主要病害、经济性状、外观质量进行比较分析。结果表明,9K30、9K57、HNCS04总体表现较好,优于对照K326(CK1)、云烟99(CK2);9L51、HN230表现较差;Y87NS1、CF240、9K54表现中等。

视觉基础模型支持的老城区更新规划方法与实践

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