A Study on Palaeogeography and Metallogenic Conditions of Early Carboniferous Bauxite Deposits of Old Weathered Crust in Guizhou, Sichuan, Hunan and Hubei Provinces

There are four subtypes. namely, Ia, Ib, Ic and Id of the Early Carboniferous bauxite deposits of the old weathered crust type in Guizhou, Sichuan, Hunan and Hubei provinces. They are all distributed in the Upper Yangtze old land. As a result of the Hunan-Guizhou palaeo-faulting, the crust on the northern side of the fault was uplifted and became land, thus suffering denudation. The bauxitic substances left in the weathered crust evolved and were reworked into bauxite. On the other hand, the crust on the southern side of the fault sank and remained to be part of an ocean. The bauxite deposits of Ia and Ib subtypes were formed by in-situ enrichment of residual bauxitic substances in the weathered crust of the old land, but bauxite deposits of Ic and Id subtypes resulted from transportation, accumulation and sedimentation of allothogenous bauxitic substances on the weathered crust of the old land. The processes of transportation may be distinguished as dry transportation and wet transportation, both of which proceeded under atmospheric conditions.

Landscape Spatial Characteristics of Streets and Lanes in Traditional Towns of Sichuan and Chongqing in China

The physical space and viewing perception of streets and lanes in traditional towns of Sichuan and Chongqing in China are deeply influenced by the terrain conditions of the area.The adaptation of the geographical environment with the change of the terrain height difference creates rich spatial rhythm changes in the spatial continuity and opening and closing processing of streets and lanes.The aspect ratio of building elevation and street front of frontage makes the street and lane scale adapt to the different functional requirements of business and life.At the same time,the changeable terrain height difference creates the composition level of street landscape perception of close shot,medium shot and long shot,which constitutes the unique regional charm of streets and lanes in traditional towns of Sichuan and Chongqing.

ANALYSIS ON EFFECT OF SOUTH ASIA HIGH ON MID-SUMMER EXTREME DROUGHT AND FLOOD IN SICHUAN-CHONGQING REGION

NCEP/NCAR data are utilized to analyze an extreme flood year(1998) and an extreme dry year(2006) in the Sichuan-Chongqing region(SCR) and the results are as follows. The positive divergence of South Asia High(SAH) is stronger in the flood year; the position of the ridge line of SAH is southward compared with the annual average; Western Pacific Subtropical High(WPSH) extends westward and its ridge line is southward. In the drought year, the positive divergence of SAH is weaker, its ridge line is northward, and the position of WPSH is also northward. As shown in the dynamics, in drought(flood) years, negative(positive) vorticity advection in the upper atmosphere can cause the atmosphere to ascend(descend), and anomalous circulation of SAH displays divergence(convergence), and anomalous circulation of the lower atmosphere shows convergence(divergence). Thermal structure of the atmosphere shows that there is warm(cold) temperature advection in the lower atmosphere, and the vertical distribution of diabetic heating causes SAH's local circulation to display convergence(divergence) and affects vertical motion of the lower atmosphere circulation eventually. To some extent, the two extreme years in the SCR is closely related to the vertical motion of atmosphere circulation and the variation of such vertical motion is caused by differences of interactions between SAH and lower atmosphere circulations.

The mixing of multi-source fluids in the Wusihe Zn–Pb ore deposit in Sichuan Province, Southwestern China

The Sichuan-Yunnan-Guizhou(SYG)metallogenic province of southwest China is one of the most important Zn-Pb ore zones in China,with^200 Mt ZnPb ores at mean grades of 10 wt.%Zn and 5 wt.%Pb.The source and mechanism of the regional Zn-Pb mineralization remain controversial despite many investigations that have been conducted.The Wusihe Zn-Pb deposit is a representative large-scale Zn-Pb deposit in the northern SYG,which mainly occurs in the Dengying Formation and yields Zn-Pb resources of^3.7 Mt.In this paper,Zn and S isotopes,and Fe and Cd contents of sphalerite from the Wusihe deposit were investigated in an attempt to constrain the controls on Zn and S isotopic variations,the potential sources of ore-forming components,and the possible mineralization mechanisms.Both theδ66Zn andδ34S values in sphalerite from the Wusihe deposit increase systematically from the bottom to the top of the strata-bound orebodies.Such spatial evolution inδ66Zn andδ34S values of sphalerite can be attributed to isotopic Rayleigh fractionation during sphalerite precipitation with temperature variations.The strong correlations between the Zn-S isotopic compositions and Fe-Cd concentrations in sphalerite suggest that their variations were dominated by a similar mechanism.However,the Rayleigh fractionation mechanism cannot explain the spatial variations of Fe and Cd concentrations of sphalerite in this deposit.It is noted that the bottom and top sphalerites from the strata-bound orebodies document contrasting Zn and S isotopic compositions which correspond to the Zn and S isotopic characteristics of basement rocks and host rocks,respectively.Therefore,the mixing of two-source fluids with distinct Zn-S isotopic signatures was responsible for the spatial variations of Zn-S isotopic compositions of sphalerite from the Wusihe deposit.The fluids from basement rocks are characterized by relatively lighter Zn(~0.2‰)and S(~5‰)isotopic compositions while the fluids from host rocks are marked by relatively heavier Zn(~0.6‰)and S(~15‰)isotopic compositions.

The characteristics of temperature variability with terrain, latitude and longitude in Sichuan- Chongqing Region

Using the daily temperature data of 95 meteorological stations from Sichuan-Chongqing Region and its surrounding areas, this paper adopted these methods （e.g., linear regression, trend coefficient, geographical statistics, gray relational analysis and spatial analysis functions of GIS） to analyze the relations of temperature variability with topography, latitude and longitude. Moreover, the rank of gray correlation between temperature variability and elevation, longitude, latitude, topographic position and surface roughness also was meas- ured. These results indicated： （1） The elevation affected temperature variability most obviously, followed by latitude, and longitude. The slope of the linear regression between temperature change rate and elevation, latitude and longitude was 0.4142, 0.0293 and -0.3270, respectively （2） The rank of gray correlation between temperature change rate and geographic factors was elevation 〉 latitude 〉 surface roughness 〉 topographic position 〉 longitude. The gray correla- tion degree between temperature change rate and elevation was 0.865, followed by latitude with 0.796, and longitude with 0.671. （3） The rate of temperature change enhanced with the increase of elevation. Especially, the warming trend was significant in the plateau and mountain areas of western Sichuan, and mountain and valley areas of southwestern Sichuan （with the warming rate of 0.74℃/10a during the 1990s）. However, there was a weak warming trend in Sichuan Basin and its surrounding low mountain and hilly areas. （4） The effects of latitude on temperature change rate presented the specific regulation, which the warming rate of low-latitude areas was more significant than that of high-latitude areas. However, they were consistent with the regulation that the increasing of low temperature controlled most of the warming trend, due to the effects of terrain and sically, temperature variability along longitude elevation on annual mean temperature. （5） Ba- direction resulted from the regular change of elevation along longitude. It was suggested that, in Sichuan-Chongqing Region, special features of temperature variability largely depended on the terrain complexity （e.g., undulations, mutations and roughness）. The elevation level controlled only high or low annual mean temperature and the range of temperature change rate in the macro sense.

Relationship between Atmospheric Heat Source over the Tibetan Plateau and Precipitation in the Sichuan–Chongqing Region during Summer

NCEP-NCAR reanalysis data and a 47-yr daily precipitation dataset from a network of 42 rain gauges are used to analyze the atmospheric heat source （〈Q1〉） anomaly over the Tibetan Plateau （TP） and its influence on the summer precipitation anomaly in the Sichuan-Chongqing region. Results show that the vertical advection of 〈Ql〉 over the central TP is a major factor affecting summer precipitation in the Sichuan-Chongqing region. When the vertical ad- vection of〈Q1〉 over the central TP is strengthened, the South Asian high shifts further than normal to the south and east, the western Pacific subtropical high shifts further than normal to the south and west, and the Indian low weak- ens. This benefits the transport of warm moist air from the low latitude oceans to the Sichuan-Chongqing region. Correspondingly, in the high latitudes, two ridges and one trough form, which lead to cool air moving southward. These two air masses converge over the Sicbuan -chongqing region, leading to significant precipitation. In contrast, when the vertical advection of 〈Q1〉 over the central TP is weakened, the South Asian high moves to the north and west, the subtropical high moves eastward and northward, and the Indian low strengthens. This circulation pattern is unfavorable for warm air advection from the south to the Sichuan-Chongqing region, and the cool air further north cannot move southward because of the presence of two troughs and one ridge at high latitude. Thus, ascent over the Sichuan-Chongqing region is weakened, resulting in less precipitation.

Discovery of micromammalian fauna of Sichuan-Guizhou Area in Lantian, Shaanxi

The study of the Xishuidong micromammalian fauna, found from Lantian, Shaanxi Province, indicates that both the northern slope of the Qinling Mountains and Sichuan_Guizhou area must belong to the same Oriental Realm in middle_late Middle Pleistocene. The age of the Xishuidong fauna should be later than that of the Gongwangling fauna, and even a little later than that of the Zhongjiawo fauna in age. The fauna is related not only to that of layers 9 and 8 of Peking Man Locality in northern China, but also to the micromammals from Hexian Man Locality in southern China.

Simian Mountains: Home of a Thousand Waterfalls

THE Simian Mountains Scenic Area sits in the southern Jiangjin District of Chongqing in southwest China,128 kilometers away from downtown Chongqing.It is a part of the Dalou Mountain Ranges on the Yunnan-Guizhou Plateau.Covering an area of 213 square kilometers,it is a national forest park and 5A-rated national tourist attraction.The park consists of the Wangxiang Pavilion.

云贵川非物质文化遗产与传统村落空间分布格局及影响因素

基于核密度、空间重心模型、空间错位指数和地理探测器等方法,系统分析了云贵川非物质文化遗产(非遗)和传统村落的空间分布格局,包括空间分布密度和空间错位的程度、强度与类型,并探讨了影响其空间分布的因素。结果显示:①非遗和传统村落的空间分布结构分别为“两核一带多点”和“北疏、南密、中空”;②两者的总体空间错位特征明显,各州市在空间错位的程度、强度和类型上均具有差异性;③非遗和传统村落的空间分布都受到地形地貌和河流水系等自然环境因素的影响,在社会经济影响因素上,非遗空间分布的主要影响因素是文化和经济发展,传统村落空间分布的主要影响因素是人口和文化。

川渝地区氢能产业政策环境研究

具有零碳排放且可再生的氢能,是促进传统油气行业转型升级和推进“双碳”目标顺利实现的重要载体和抓手。作为新能源体系的重要支柱,氢能产业的健康可持续发展离不开政策的引导和支持。为了给各级政府提供决策参考、指导行业健康发展,从氢能产业制储运加用全产业链角度出发,调研了川渝地区氢能发展现状,重点对2019—2023年川渝地区氢能产业政策进行了梳理和深入研究。研究结果表明:(1)近几年川渝地区密集出台涉及氢能的扶持政策,基本涵盖了氢能全产业链的关键节点;(2)在发展路线方面,四川地区重点集中发展氢气的制备,重庆地区侧重发展氢能应用端;(3)在氢能消纳方面,两地政策都重点集中在氢燃料电池汽车领域;(4)在氢能补贴方面,两地氢能产业补贴包括氢能产业发展补贴、科技创新平台奖励等,不同城市的补贴领域、具体要求及补贴标准都各有不同;(5)在安全管理方面,川渝地区氢能管理办法相对保守,都将氢气纳入危险化工用品;(6)在加氢站建设与管理方面,川渝地区仅成都和攀枝花两市出台了关于加氢站建设与管理的具体办法,而在其他地区尚未制定相关政策。

我国西南茶叶主产省茶产业发展现状与竞争力比较分析

目的:西南地区是我国茶产业重要地区,茶产业也是西南地区重要的农业产业,对云南、贵州和四川3个茶叶主产省展开竞争力评价及分析制约因素对产业高质量发展具有重要意义。方法:从茶叶生产、产业结构、经济效益、出口贸易等方面梳理3省茶产业发展现状,运用资源禀赋系数、显示性比较优势指数和综合比较优势指数评价云贵川3省茶产业竞争力。结果:云贵川3省具有拥有较强的资源禀赋、产业规模优势及综合比较优势,云南、贵州具有较强的出口贸易竞争力,但均存在相对出口不足的问题,贵州、四川生产效率比较优势不足。结论:结合云贵川3省茶产业发展及竞争力定量分析,从持续加强茶产业的扶持发展、提升茶叶国际贸易竞争力、推动茶产业高质量发展等方面给予对策建议。

从“依形套式”到“循章衍法”:构形机理导引的历史城镇空间基因整体识别与活态传承

针对历史城镇空间基因识别、保护实践“有形无态、重式轻法”问题,提出构形机理导引的空间基因整体识别与活态传承方法。以“原型特征+构形机理”的显隐属性和“城镇格局、地块形态、街巷形式、建筑风貌”四重空间尺度为历史城镇空间基因要素解析框架,以“要素特征与结构特征同步提取”和“原型解构到显型建构机理延续”为操作路径,通过川渝地区历史城镇/街区实证研究,提出历史城镇格局结构要素与建构逻辑、地块图底肌理与聚合关系、街巷局域特征与系统节奏、建筑绝对形态与相对尺度同步提取的空间基因整体识别方法,以及城镇格局结构要素保控+基质空间重构、地块空间图底肌理修补+立体形态调节、街巷空间典型断面整饬+系统节奏保持、建筑空间异化风貌矫正+建构传统赓续的空间基因活态传承方法,以促进历史城镇空间基因保护实践从“依形套式”到“循章衍法”的路径转变。

气候变化对川渝地区再生稻产业的影响与建议——以富顺县为例

2022—2023年以田间调查、电话访谈、文献查阅和专家座谈等方式对川渝地区再生稻生产情况进行了调研,统计分析了气候变化下川渝再生稻种植区生产格局变化和发展趋势,以富顺县为例,剖析了川渝地区再生稻产业发展的潜力和面临的挑战,并就如何提升再生稻气候韧性提出5条建议。调研显示,在气候变暖情况下,川渝地区秋季热量资源更加丰富,再生稻种植呈现适生区、优生区面积不断增加、产量稳步提高等有利变化;但气象灾害呈重发趋势,再生稻生产气候风险增高。富顺县为再生稻种植优生区,具有自然条件、技术、品种、历史、品牌、需求和政策等优势。随着再生稻产业的迅猛发展和极端天气频发重发,提高应对气候变化能力、加强再生稻气候韧性建设,对加快推进川渝地区再生稻产业发展和品牌建设具有重要的现实意义。

川渝地区农业绿色高效用水科技攻关方向与对策建议

川渝地区农业种植面积大、从业人员多、产业份额大、战略意义强,但该地区长期面临严重的季节性干旱和工程性缺水,且农业绿色高效用水发展水平与经济发展、区域地位并不匹配,需提高农业节水抗旱减灾保产能力和水资源利用效率,推动川渝现代节水农业高质量发展。总结了川渝地区农业用水现状和高水效农业发展面临的问题,分析了该地区农业绿色高效用水的实际需求,在此基础上提出开展川渝农业绿色高效用水关键科技项目攻关、构建农业绿色高效用水专家智库、构建西南季节性干旱区农业绿色高效用水技术体系、建设特色水果产业节水科技创新中心、建立川渝农业绿色高效用水产业联盟等一系列对策建议。

明清以来川滇黔地区饮食文化变迁中民族交往交流交融及其特点

各民族交往交流交融是民族关系和谐发展的重要保证,更是新时代铸牢中华民族共同体意识、建设中华民族共同体的重要路径。饮食文化是中华优秀传统文化的重要组成部分,凝结了大量民族交往交流交融的实践内容和价值意蕴。川滇黔地区是我国最具代表性的民族聚居区和饮食文化遗产富集区。明清以来直至当今,该地区汉族和各民族在食材运用、饮食品及其制作技艺、饮食习俗等饮食文化的多个方面进行着交流与交融,并且其途径、方式、结果和作用等方面呈现出三个显著特点,即川滇黔地区民族饮食文化交流交融的途径主要是人口迁移流动和商贸往来,其方式主要是双向交流、相互影响,其结果和作用是促进了川滇黔地区各民族饮食文化的多元与共性并存、推动了区域饮食风味的共同体川菜、滇菜、黔菜的定型与繁荣发展,进而助推了多元一体的中国饮食文化和中国菜系的丰富与兴盛,从饮食文化的角度为铸牢中华民族共同体意识、推进中华民族共同体建设作出了独特贡献。

川渝地区国家级高新技术产业开发区创新效率提升研究

为深入贯彻科技部关于推动国家高新区高质量发展的重要指示精神,川渝地区积极建设国家级高新区,引领带动了川渝地区经济的高质量蓬勃发展。针对川渝地区各国家级高新区的创新发展水平评价、影响高新区创新发展的因素、川渝地区国家级高新区创新水平的提升等问题,运用三阶段DEA方法,测算川渝地区和全国共61个国家级高新区创新效率,并进一步探究川渝地区国家级高新区创新效率的影响因素。研究发现:高新区所在地区经济发展水平、政府支持力度和对外开放程度的提升能促进川渝地区国家级高新区创新效率的提升;高新区基础设施水平、研发人员投入密度以及研发费用投入强度对川渝地区国家级高新区创新效率影响为负。进而提出加快创新平台和创新载体体系建设、合理扩大高新区规模、充分发挥政府职能、坚持扩大对外开放水平以及加大创新资源投入等政策建议。

川渝省际毗邻经济新区户籍制度改革的现实困境与优化路径——以川渝高竹新区为例

重庆市、四川省积极实施成渝地区双城经济圈建设国家战略,在两地交界地区携手共建川渝高竹新区,着力开展经济区与行政区适度分离改革,推进产城景乡深度融合的社会主义现代化国家级新区建设取得了明显成效。然而,囿于行政区划、经济基础、社会发展等因素,川渝高竹新区规划范围内的渝北区、邻水县两地的户籍人口在就业、教育、医疗、养老、住房等保障政策上差别较大。为提升川渝高竹新区吸引企业和人才的能力、增强户籍人口的获得感和幸福感,应遵循经济建设“政策就高不就低、成本就低不就高”的原则,坚持以行政区经济理论、府际关系理论、跨域治理理论为指导,推进户籍制度改革。

红色文旅融合发展效应时空演变及短板分析——以湘鄂渝黔革命老区为例

系统思辨红色文旅融合发展效应的内涵,构建综合性评价指标体系,揭示湘鄂渝黔革命老区2013—2022年红色文旅融合发展效应的时空演化特征及其短板。结果表明:(1)红色文旅融合发展效应水平偏低但稳步缓慢提升,呈现东部率先实现升级并带动周边提升的格局。(2)各县域红色文旅融合发展效应提升水平交错呈现,尚未形成稳定的增长极。(3)红色文旅融合发展效应区域差异小,整体上呈现波动缩小态势,但湖北片区与贵州片区差异略有扩大。(4)社会效应与文化效应是关键短板,创新发展、文脉传承与地方关注度是三大突出短板因子。

自由贸易试验区对所属区域经济增长的影响--基于川渝地区的“反事实”分析

自由贸易试验区的成立对所属区域经济增长有着重要的经济意义。以川渝地区为例,利用2008年第一季度至2019年第二季度全国省域样本的GDP季度增长率、进口额、出口额及固定资产投资额数据进行合成控制,对自贸试验区的经济效应进行反事实分析。结果显示:自由贸易试验区的成立促进了川渝地区经济增长,但该影响具有异质性。对四川而言,贸易驱动对经济增长的影响较投资驱动更加显著;对重庆而言,投资驱动大于贸易驱动,且自由贸易试验区成立的经济效应具有一定的滞后性。