The Carboniferous at the Northern Foot of the Dabie Mountains and Its Tectonic Implications

In the Qinling orogenic belt. oceanic crust originated in the Early Palaeozoic. while the product of conti-nental collision appeared as late as after the Triassic. The Late Palaeozoic records there are of major impor-tance for understanding the tectonic regime at that time. The Carboniferous and even Permian sequences andthe distribution of sedimentary facies in northern Huaiyang indicate that the rocks were formed in a large basinopening towards the south. Regional stratigraphic correlation shows that the interior of the Qinling orogenicbelt was a sea trough lying between the Yangtze and North China plates in the middle part of the LatePalaeozoic. With subsequent northward migration of the South China Sea, the two seas were connected witheach other. Both the melanges and the Dabie block ia the eastern sector of the Qinling belt were formed in theMesozoic ?.

Retrogressive Microstructures of the Eclogites from the Northern Dabie Mountains, Central China: Evidence for Rapid Exhumation

The ultrahigh-pressure eclogites from the northern Dabie Mountains in central China occurred as tectonic lens or blocks within granitic gneisses or meta-peridotites. Petrologic studies suggest that the studied eclogites experienced strongly retrogressive metamorphism and produced a series of characteristic retrogressive microstructures. The retrograde structures mainly include: (1) oriented needle mineral exsolution, e.g., quartz needles in Na-clinopyroxene and rutile, clinopyroxene and apatite exsolution in garnet formed under decreasing pressure conditions during exhumation; (2) symplectite, especially, two generations of symplectites developed outside the garnet grains, which are called “double symplectite” here; (3) compositional zoning of minerals such as garnet and clinopyroxene; (4) minerals with a reaction rim or retrograde rim, e.g., omphacite with a diopside rim, diopside with an amphibole rim and rutile with a rim of ilmenite. These retrograde textures, especially mineral zoning and symplectite, provide important petrologic evidence for the exhumation process and uplift of high-grade metamorphic rocks such as eclogite in the northern Dabie Mountains, indicating a rapid exhumation process.

Connection of Farmland Consolidation Construction Works in Northern Anhui Plain:A Case Study of Si County of Anhui Province

The connection of farmland consolidation construction works was studied,to provide theoretical and practical basis for bringing into play optimal functions.It employed theoretical analysis method,case analysis method,and experience summary method.Through empirical study of Si County in Anhui Province,it further analyzed connection of four works:land consolidation,irrigation and drainage,field roads,farmland protection,and ecological and environmental protection,to provide methods and possibilities for coordination and connection of four works.It is required to take the land consolidation as a system,take full consideration of all aspects,attach great importance to connection of four works,so as to bring into full play optimal functions and realize sustainable use of land resources and sustainable development of social economy.

Storm Deposits of the Sinian Zhangqu Formation in Northern Anhui——An Upward Shallowing Carbonate Sequence

This paper studies. for the first time, the storm deposits of a carbonate sequence in the Sinian ZhangquFormation in northern Anhui. In the formation. a great number of calcareous trider sponge spicules were dis-covered in a distal storm turbidity sequence, which have provided further evidence for the correlation of theSinian Systems in North and South China from a view point of palaeontology.

Geochemistry of Neoproterozoic mixosedimentite in northern Anhui and its geological significance

Major oxides,as well as trace elements (including rare earth elements) compositions have been analyzed for the mixosedimentites from Neoproterozoic Jiayuan Formation in northern Anhui,China. The results show that the concentrations of elements are closely related to the relative proportions of carbonates and terrigenous detritus (varying from 2/3 to 1/9 based on petrographic study). The ratios between some immobile elements (e.g. La,Th,Zr and Sc) are constant and then can be used as tracers for the discrimination of provenance and tectonic setting of terrigenous detritus. The results indicate that the terrigenous detritus mainly came from the felsic volcanics related to continental arc,with minor contribution from the old basement. Combined with recent research progresses,these mixosedimentites imply that the Neoproterozoic sedimentation in northern Anhui was probably taken place in a back arc basin during the convergence of Rodinia super continent between 1.0 and 0.8 Ga.

Classification and Development Laws of Karst Landform in Suzhou Area, North Anhui Province of China

Suzhou area in north Anhui Province is a low hilly area on the Huaibei Plain where carbonate rocks and karstification are widely distributed, and karst landscapes form major physical contours of the bedrock outcrops. Through field investigation, karst landscapes of Suzhou area were divided into two categories based on their morphological characteristics: macro-geomorphologic landscapes including normal hills, dry valleys, karst springs and caves, and micro-corrosion landscapes including corrosion pits, dissolved pores, dissolution traces, corrosion cracks, clints and karrens. Distribution, development and scale of karst landscapes in this region are controlled by climate, rock type, structure, topography and other factors. It was suggested that karst landscapes in the study area could be used as a representative of karst landforms in North China.

Ore-forming Fluid Systems and Mineralization in the Eastern Jiangnan Uplift in the Border Area of Anhui and Jiangxi Provinces, China

Obvious differences in mineralization characteristics exist between the southern and northern parts of the eastern part of the Jiangnan Uplift in northern Jiangxi Province and southern Anhui Province. The regional metallogeny is discussed, and the ore-forming fluid systems are classified in this article. It is proposed that the fluid ore-forming activities in the Jiangnan Uplift both in northern Jiangxi and southern Anhui have close relationships with the crust-mantle interaction and magmatic-tectonic activities. The types and scales of the mineralization on the both sides of the eastern Jiangnan Uplift were determined by fluid ore-forming systems and geological backgrounds.

Mineral Composition and Metamorphic P-T Conditions of the Eclogitic Rocks in the Eastern Dabie Mountains and Their Genetic Implication

There are obvious differences in the mineral assemblage and metamorphic P-T conditions between the eclogites from the northern and southern parts of the eastern Dabie Mountains. Those from the northern part of the mountains are developed in Alpine peridotite and gneiss. They have a mineral assemblage of garnet+diopside with no quartz, and were formed at temperatures of 600℃-740℃. Those from the southern part are developed in gneiss and marble. They consist of garnet+omphacite+less quartz and were metamorphosed at temperatures in the range of 650°-800℃. These differences suggest that the former may be formed during the metamorphism of the deep subducted oceanic crust, whereas the latter may be genetically related to the subduction of the continental crust in this area.

皖北民间“非遗”舞蹈的社会生态建构——以安徽蚌埠冯嘴子村花鼓灯传承为例

自宋代以后,聚居在淮河中游的村落,流行一种集灯歌、小戏、群舞、锣鼓于一体的“原生形态”汉民族歌舞——花鼓灯。因其有着世界上最丰富系统的舞蹈语言体系和别具一格的民族民间文化跻身于非遗国家级名录,并作为唯一的汉民族民间舞种被列入国家民族民间文化保护工程。能歌善舞的沿淮人通过多元场域展演并宣示着“咒语多变成颂歌”的传衍历程,对当地社会文化的景观格局产生重要影响,为花鼓灯传承建构了良好的社会生态。蚌埠冯嘴子村花鼓灯传承的案例表明“生存优势”是影响文化遗产生存、竞争与演替的重要考虑因素,是衡量文化生存潜能的重要标志。

栽培环境下大别山北部野生鹅观草繁殖相关性状变异分析

为研究大别山北部野生鹅观草繁殖相关性状变异,以22个野生鹅观草居群为材料,对12个繁殖相关性状进行变异分析、相关性分析、聚类分析和主成分分析。结果表明,不同居群间鹅观草繁殖相关性状存在丰富的变异,单株粒重变异系数最大,为15.97%,其次是芒长度(13.98%)和千粒重(13.46%);居群间遗传多样性指数平均值为0.799。相关分析表明,海拔与芒长度、小穗长度显著正相关(P<0.05),经度与小穗长度显著负相关(P<0.05),纬度与芒长度、小穗长度和单株粒重显著相关(P<0.05)。通过聚类分析,22个鹅观草居群被分为3个类群,第一类群花序更长,单花序穗数、单穗小花数和单穗种子数更多,千粒重和单株粒重更低;第二类群具有更大的芒长度和小穗长度,种子更长,千粒重更大,属于大粒型;第三类群花序更短,单花序穗数、单穗小花数和单穗种子数较低,但单株粒重较高,属于潜在种子高产型。结合主成分分析和二维排序,种质材料1、13和15平衡了穗型紧凑、种子粒大、单株粒重等优良性状,具有潜在高种子产量特性,可为鹅观草新品种培育提供基础材料或作为优异种质进一步研究。

煤层底板含水层区域注浆改造浆液扩散范围现场示踪试验

近年来,为解放底板高承压灰岩水上煤炭资源,华北煤田普遍采用地面定向钻技术,对太原组薄层灰岩进行区域性注浆加固改造(习称“底板区域治理”),以全面封堵灰岩岩溶裂隙并阻断垂向导水通道。该技术中,与浆液扩散范围(半径)密切相关的“水平分支孔”孔间距设计问题,一直备受学界和业界的广泛关注。皖北矿区底板区域注浆工程量大,特别是深部资源开采,将有数十亿元的注浆工程,有必要查清浆液扩散范围真实数据。为此,以皖北矿区恒源煤矿为研究基地,依托Ⅱ63采区底板区域治理工程,设计并实施浆液扩散范围示踪试验,在中间的水平分支孔(Z8-7)投放荧光剂(示踪剂),在两侧的水平分支孔(Z8-6、Z8-8)以及交叉分支检测孔(Z8JC)取岩屑样鉴别荧光水泥,以获得浆液扩散范围,进而在浆液扩散影响因素分析基础上,构建恒源煤矿底板区域注浆治理浆液扩散范围计算公式。结果表明:①综合岩屑现场及室内鉴别结果分析,获得恒源煤矿Ⅱ63采区底板区域注浆浆液扩散范围为38.3~44.0 m,且水泥分布密集区在水平分支孔浆液扩散范围30 m以内,该区域内注浆效果最佳。②通过现场岩屑快速鉴别与室内岩屑精准鉴别,取得的浆液扩散范围基本一致,证明了荧光示踪浆液扩散范围的有效性。③通过对比分析,认为在计算参数、边界约束等符合实际注浆工况条件下,浆液扩散范围理论计算和数值模拟结果,与现场示踪试验实测结果较为接近。④利用示踪试验过程中的压水试验及注浆参数、钻遇构造及水文地质响应等数据,考虑重力、构造、地下水径流等因素影响,借助SPSS非线性拟合软件,得到恒源煤矿Ⅱ63采区底板区域注浆浆液扩散范围计算公式。⑤基于恒源煤矿受注层实际地质、水文地质条件,利用拟合的浆液扩散范围计算公式得出Ⅱ63采区Z8场地浆液扩散范围为37.8~42.9 m,与浆液扩散范围示踪试验实测结果相近,计算公式可在类似条件下推广应用。本次煤矿底板区域注浆浆液扩散范围现场示踪工程试验,不仅取得了浆液扩散范围的真实数据,而且阐明了浆液扩散与多种地质、水文地质因素之间的内在联系,揭示了超深、超长定向钻注浆浆液扩散机理,构建了浆液扩散范围计算公式,为类似条件下底板区域治理工程水平分支孔孔间距的合理设计提供了参考依据。

县域视角下皖北地区农业生产效率及其空间格局演变

提高农业生产效率对保障农业可持续发展和推进国家农业现代化发展战略具有重要意义。选取皖北地区35个区(县)作为决策评价单元,运用三阶段DEA模型测度皖北地区农业生产效率的真实水平,结合空间自相关模型展示皖北农业生产效率的空间集聚效应。研究结果表明:从时间序列上看,皖北地区整体的农业生产效率呈现波动轻微下滑趋势,研究前期的农业生产效率水平普遍优于后期,调整后处于技术效率前沿面的区(县)增多。人均GDP成为农业生产效率提高的有利因素,农林水事务支出和第三产业占比对农业生产效率既有正向作用也有负向作用。从全局空间上看,除2017年,其余年份皖北农业生产效率均存在明显的空间正相关性和空间集聚现象。从局部空间上看,皖北农业生产效率的空间集聚效应随时间变化在不断减弱,且空间分布格局以同类集聚分布(“高-高”型或“低-低”型)为主。基于此,研究探讨皖北地区真实的农业生产效率水平及其空间分布特性对后续思考皖北农业生产发展路径具有一定意义,以期为精准改善皖北地区农业生产现状及完善相应的农业发展政策措施提供理论依据。

乡村文化与乡村意象构建:旅游凝视与具身体验的双视角

城市化进程加快,城市居民纷纷“下乡”找寻记忆中的精神家园。乡村成为人们逃离日常工作生活的空间载体,而文化是乡村旅游的灵魂和本质。皖北作为传统农业生产基地,人地互动创造出了独特丰富的乡村文化,在回顾乡村文化、乡村意象内涵及旅游凝视、具身体验理论的基础上,设计游客乡村文化意象评价指标,借助SPSS 28.0软件对问卷数据进行分析,得出如下结论:乡村文化是驱动游客前往皖北乡村旅游地的关键因素。游客乡村文化意象表征为两个面向:一是游客对文化客体的单向凝视与回归,体现为对乡村传统风貌的地方性凝视,对乡村传统生产生活的乡土性回归;二是游客与文化主客体的双向互动与对话,体现为对乡村文化客体的具身性体验,与乡村文化主体的互动式对话。

皖北汉画像中淮夷与吴越文化的遗存研究

今天的皖北汉画像石出土地域,在汉代隶属于不同刺史部的郡县,出土的画像呈现出丰富多样的类型面貌,其体现了汉代以儒家为主流意识的时代精神。先秦时期,皖北先后属于淮夷和吴越所辖地域,出土的画像也具有淮夷与吴越文化遗存的特点,反映了该区域的地理环境、族群信仰、文化生态面貌。本文首先借助于历史地理学的方法对皖北汉画像石出土地域进行钩沉考索,然后以图像形式语言分析汉画像的视觉表征,在此基础上,再探索其文化内涵和审美倾向,旨在对皖北地域汉画像中淮夷与吴越文化遗存的特点展开研究。

新时代皖北乡村生态振兴的现实困境与路径优化

生态振兴作为乡村振兴的应有之义,不仅对巩固脱贫攻坚成果和守住不发生规模性返贫底线起着重要支撑作用,更是助推乡村高质量发展的关键一环。皖北地区乡村生态振兴前期在人居环境、空间治理、生态保护等方面已取得一系列成效,但受制于脆弱的自然生态和薄弱的地区经济,导致内生动力不足,现阶段在主体参与、生产方式、生态产品、生态文化、治理效能等方面遇到现实困境。为加快构建皖北人与自然和谐共生的现代化,需从政民协同、绿色转型、产业融合、文化赋能、治理有效等维度多措并举探索皖北乡村生态振兴的实践路径。

弃土坡面不同建植恢复方式的减流减沙效应

[目的]生产建设项目弃土场进行植被恢复后能够有效防治水土流失。探讨弃土场不同植被恢复方式的减流减沙效果,可以为弃土场后续治理与监管提供理论依据。[方法]选取皖西大别山区生产建设项目弃土,通过人工模拟降雨试验获得不同建植方式(撒播、条播、穴播)和植被恢复阶段(生长期、成熟期、枯萎期)的弃土坡面产流产沙特征,并利用累积距平等方法分析其规律和差异。[结果]相对裸坡,植被恢复可有效延缓初始产流时间,撒播种植的效果最为明显。不同建植方式均起到一定的减流减沙效应,坡面累积产流产沙量呈现出:撒播<条播<穴播<裸坡以及生长期<成熟期<枯萎期的规律;坡面产沙与产流过程存在差异性,减流效应弱于减沙效应。[结论]建植方式减流减沙效益表现为撒播优于条播,穴播最差。生长期减流减沙效益优于成熟期,枯萎期最差。撒播方式在生长期内呈现出最佳的减流减沙效益,减流率和减沙率分别达到49.6%,95.5%。

大别山北缘不同生活型木本植物叶功能性状及其耦合关系

【目的】探讨大别山北缘不同生活型木本植物叶功能性状变异,研究叶功能性状指标之间的耦合关系,为解析植物对气候变化的响应机制提供依据。【方法】采集大别山北缘连康山国家级自然保护区30种常见的不同生活型木本植物(常绿、落叶、乔木、灌木)的叶片,测定其叶绿素含量(以SPAD表示)、干鲜比、氮质量分数、磷质量分数、钾质量分数、氮磷比、叶面积、比叶面积共8个叶功能性状指标,分析了不同生活型木本植物叶功能性状及其相关性。【结果】不同生活型木本植物叶功能性状指标具有一定的差异性,其中常绿和落叶树种的叶片SPAD、氮质量分数、磷质量分数、钾质量分数、叶面积和比叶面积之间差异显著(P<0.05);乔木与灌木树种的叶面积、氮质量分数、磷质量分数、钾质量分数、干鲜比与氮磷比差异显著(P<0.05)。部分叶功能性状指标之间存在一定的相关性,叶片氮、磷质量分数与钾质量分数呈显著正相关(P<0.05),叶片氮质量分数与磷质量分数呈显著正相关(P<0.05);叶面积与叶片氮、磷、钾质量分数呈显著正相关(P<0.05),比叶面积与叶片氮、磷、钾质量分数呈显著正相关(P<0.05)。主成分分析结果表明:叶片磷、氮、钾质量分数是较为重要的叶功能性状指示指标,可将30种木本植物归为4个功能组,且第1和第2主成分对植物叶功能性状变异的贡献率分别为55.2%和12.8%。【结论】叶功能性状指标在不同生活型木本植物之间存在一定差异,其中叶磷、氮、钾质量分数是指示性指标,且与叶面积显著正相关。图4表1参28.

乡村振兴背景下皖北平原村庄规划思路分析——以淮北市古饶社区为例

本文以淮北市宋疃镇古饶社区村庄规划为例,归纳分析皖北地区平原村庄规划编制中的普遍问题,结合国土空间规划体系的相关要求,提出科学严谨的规划思路,以保护生态环境为前提,适当兼顾中原地区文化习俗,从村庄的土地利用、基础设施、产业发展、文化保护方面做出切实可行的规划引导,打造乡村社区生活圈,并为其他平原村庄融合发展提供指导建议,推进安徽省乡村振兴及美丽乡村建设进程。

皖西大别山区近20年农作物生产结构变化特征及影响因素分析

以皖西大别山主要农业区六安市为研究区,通过安徽省统计年鉴收集并整理了近20年(2000—2021年)农业生产数据,明确主要农作物类型,分析了耕地面积、种植面积和产量在近20年的变化特征和影响因素。结果显示:(1)近20年粮食作物生产总体变化平缓,仍以稻谷和小麦为主,二者此消彼长。而玉米产量增长较快,逐渐居于第三位次;(2)经济作物生产尽管以蔬菜和油料为主,但随着油料作物产量和种植面积的持续下降,逐渐形成了“蔬菜主导、药材和茶叶地位不断提升”的格局;(3)区域农作物生产结构逐渐从以“粮食作物生产”为主转向“经济作物与粮食作物并重”的发展方向;(4)皖西大别山区近20年农作物结构变化主要受气温变化、受灾面积、机械化水平、政策和人口因素影响。研究结果可为区域农业生态高效发展及相关政策的制定提供一定的理论依据。

皖北方言的动量范畴

“量”是人类认识和把握世界的重要视角,当人们将“量”的认知投射到语言中,便形成了量范畴,即“量”的语法语义范畴。“动量范畴”是把“动作量”的语法意义等加以归类而得出的类名。文章用田野调查、共时比较等方法和“有界”“无界”等理论,对皖北方言的“动量词语”和“副词+V”构式进行描写分析,指出了它们在语法、语义、语用等方面的不同用法及特点。