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.

What are the keys to influence the life satisfaction of eco-migrants in the northern foot of the Qilian Mountains?A test based on the livelihood risk interaction

Eco-migrants'ability to adapt to livelihood risks and their satisfaction with lives directly affect the ecological and economic benefits of ecological migration engineering.To formulate an effective livelihood risk prevention system and welfare guarantee mechanism,we took the ecomigrants in Wuwei City as an example,developed an integrated analytical framework for life satisfaction and employed linear regression models to identify the interactions between livelihood risk and life satisfaction.Our findings indicate that 94.66%of eco-migrants in Wuwei City are threatened by livelihood risks after relocation.High living expenses,poor quality of redistributed production goods,and re-poverty constitute the main risks.The risk multiplicity index is 2.96.Besides cultural types,there are no significant differences in regions and livelihoods.A total of 55.73%of eco-migrants are satisfied with their lives,with the Liangzhou district scoring the highest.Except for satisfaction with development potential and public services,no significant intergroup differences were found among regions and livelihood patterns.Eco-migrant's life satisfaction is significantly affected by livelihood risks.Eco-migrants'satisfaction with living income,social integration,farmer-friendly policies and overall life is negatively affected by the risk of repoverty and inadequate social security.An ecomigrant's satisfaction with development potential and community construction is not influenced by one type of risk alone,but the interaction between risks has a strong influence.The interaction of welfare risks with economic risks and policy risks will balance and weaken the adverse effects of a single risk on those elements in the economic and policy spheres.This study offers novel ideas for rural revitalization,hollow governance,and well-being assurance.

Space Structuring of the Northern Foot of the Qinling Mountains(Xi'an Section) based on Landscape City

Northern foot of the Qinling Mountains(Xi'an Section) is a transitional section between the Qinling Mountains and Xi'an City, so it has great ecological signifi cance. On the basis of sorting out landscape city, space structuring of the northern foot of the Qinling Mountains was studied within the theoretical framework of landscape city, it was disclosed that northern foot of the Qinling Mountains was a signifi cant ecological screen for the landscape city spatial pattern of Xi'an, and an important carrier for its "mountain, water and city" cultures. Then, fi ve infl uence factors for the space structuring of the study area were given, and basic contents of the space structuring analyzed from fi ve perspectives of spatial structure, spatial form, ecological environment, integration of regional spaces, historical and cultural context, so as to explore ecological conservation and moderate utilization of the northern foot of the Qinling Mountains from the perspective of space structuring.

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.

Thrusting and Exhumation Processes of a Bounding Mountain Belt: Constraints from Sediment Provenance Analysis of the Hefei Basin

Lithic (or gravel) composition analyses of the Jurassic Sanjianpu Formation and Fenghuangtai Formation in the Hefei basin show that the sediment provenance consists mainly of four kinds of rock units: the basement metamorphic complex, granitic rocks, medium- and low-grade metamorphic rocks, and sandy and muddy sedimentary rocks, which are distributed along the bounding thrust belt. The whole stratigraphic section can be divided into 2 lithic sequences and 7 subsequences. The regular distribution and changes of lithic fragments and gravels in lithic (or gravel) sequences reflect that the bounding thrust belt of basin has undergone 2 thrusting cycles and 7 thrusting events. Lithic (or gravel) composition analyses of the basin fully reveal that the northern Dabie basement metamorphic complex was exhumed on the earth's surface in the Middle and Late Jurassic, and extensive intermediate and acid intrusive rocks were developed in the southern North Huaiyang or northern Dabie Mountains during the basin's syndepositional stage.

Lower time limit on the UHPM rock exhumation: Discovery of eclogite pebbles in the Late Jurassic conglomerates from the northern foot of the Dabie Mountains, eastern China

Eclogite pebbles are first discovered in late Jurassic conglomerates of the Fenghuangtai Formation from the northern foot of the Dabie Mountains, eastern China. The eclogite shows relatively strong retrograde metamor-phism. The major remnant minerals are garnet, phengite, quartz, rutile, clinozoisite, fingerprint(or worm)-form sym-plectite and pseudomorphic enclosure of coesite in garnet. End-member components of the garnet mainly made up of grossular (27.7%-37.8%), almandinc (45.5%-49.0%) and pyrope (12.3%-25.7%). End-member components of the pyrope is less than 30%, i.e. equivalent to C type eclogite. Si-cations of the phengite are 3.44-3.54 p.f.u. (taking O=11as standard). It is estimated that the pressures are 2.5-3.2 GPa, the temperatures are 600-900℃. Discovery of the eclogite pebbles in the late Jurassic conglomerates from the northern foot of the Dabie Mountains suggests that the HP-UHP metamorphic rocks of the Dabie Mountains, which were formed in Triassic, had been exposed to the surface in

基于“两山”理论的秦岭北麓乡村空间营建策略研究

空间营建是秦岭北麓乡村地区“两山”实践的重要保障.研究提出在乡村“资源-资产-资本”的转化过程中,应构建“两环节、三层次、多主体”的“两山”转化空间营建路径:以生态基础培育和多元增值开发为两大空间营建环节,构建“区域→单元→地块”三层次营建体系,建立多主体参与共赢的营建机制.研究以西安鄠邑区为例,梳理其在大都市圈发展背景下“两山”转化的乡村空间营建问题,提出“要素统筹、生境修复、产居转型、有序共建”四方面空间营建策略,形成地域适宜性的绿色共建模式,以期为地区乡村振兴和高质量建设提供借鉴.

Discovery of the eclogite and its petrography in the Northern Dabie Mountain

Eclogite from the Northern Dabie Mountain is a new finding by the authors. These eclogites in foliated perdotite are enveloped by banded gneiss and occur in the mafic-ultramafic rock belt. They are mainly composed of omphacite, garnet, diopside, orthopyroxene, amphibole, plagioclase and magnetite, and a small amount of rutile, spinel, olivin and 鏾rundum. The mineral association of peak metamorphism of the eclogite is omphacite+garnet+rutile. The existence of eclogite in the Northern Dabie Mountain implies that there was an eclogitic metamorphism prior to the granulitic facies one in the mafic-ultramafic rock belt.

秦岭北麓乡村可持续发展的环境美学评价体系构建

构建秦岭北麓乡村的环境美学评价体系,旨在优化景观发展,通过视觉美感、自然环境、生态平衡、文化传承和居民满意度等多维度指标,采用定量与定性分析,为乡村规划提供科学支持,促进生态文明,推动区域可持续发展,并为相似乡村地区提供参考。

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.

基于AHP-EWM-TOPSIS的秦岭北麓西安段冰酒葡萄生态适宜性评价

本研究旨在评估冰酒葡萄(Ice wine grape)在秦岭北麓西安段的生态适宜性,以促进该作物种植的经济潜力并优化当地葡萄产业结构。根据冰酒葡萄生长需求和秦岭北麓自然气候特点,研究选取最冷月均温、≥10℃有效积温、生长季干燥度、坡度、土壤pH等评价因子,确立冰酒葡萄适宜性评价体系。基于秦岭北麓西安段2000—2021年逐日气象观测数据、生态数据,采用层次分析法(AHP)、改进熵值法(EWM)、TOPSIS综合评价法,本研究构建了一个冰酒葡萄种植综合区划评估模型,对影响冰酒葡萄种植的气候、地形、土壤三大指标的空间分布进行分析。经统计分析得出最适宜区、适宜区、次适宜区和不适宜区4个等级。结果表明,所提出的方法能够有效地识别秦岭北麓西安段内冰酒葡萄种植的生态优势区域,且所得区划结果与实际情况高度一致。这一发现对冰酒葡萄种植的区域布局和科学规划提供了重要参考。

秦岭北麓筠竹种子育苗试验

因气候条件的限制,秦岭北麓很难获得竹子种子,因而难以通过播种育苗获得造林绿化所需要的大量苗木。2019年7月在秦岭北麓陕西省楼观台国有生态实验林场辖区的森林公园内发现了一株筠竹开花并结实,遂采集种子,开展了播种试验,以期探讨秦岭北麓竹种子育苗的可行性。结果显示,筠竹采种后在室温下贮藏,第2年播种的出苗率为25.4%;实生苗前3年的生长状况优于秦岭北麓优势竹种淡竹的生长。该研究表明,在秦岭北麓筠竹通过播种进行繁殖是可行的,并探索了一套实生苗繁育的管理经验,可在一定范围内推广,为绿化造林和生态建设提供大量苗木。

秦岭北麓西安段峪口村落洪涝适应性营建智慧研究

秦岭北麓西安段为洪涝灾害多发区域.在长期同雨洪博弈共生的过程中,当地传统村落形成了以低技术、低成本、低维护为特征的洪涝适应性智慧.在洪涝风险日益增多的当下,这些传统实践智慧对促进区域人水和谐、洪涝韧性和可持续发展具有重要借鉴意义.以秦岭北麓典型区域内峪口传统村落为例,基于田野调查、多源数据比对互证法和图解分析法,本文旨在阐明洪涝适应与村落营建关系的基础上,在选址、街巷布局及洪涝管控设施系统等三个方面,系统研究其洪涝适应性营建智慧,以期在新时期为城乡洪涝韧性人居环境规划营建,提供理论和经验借鉴.

Eclogites from the Northern Dabie Mountains, eastern China: Geochemical characteristics, Sr-Nd isotopic compositions and tectonic implications

The petrologic geochemical and Sr-Nd isotopic compositions of the eclogites from the mafic-ultramafic rock belt (MUMRB) in the Northern Dabie Mountains indicate that: (1) the protoliths of most of eclogites are tholeiitic basalt and a few may be gabbro, and most of them produced from the Yangtze subducted continental crust (lower crust and formed during the deep subduction) and a part may be from paleo-oceanic relics between the Yangtze and North China continental plates; (2) their positive Nb anomalies and related trace element characteristics show that they did not form in the island-arc setting; (3) the metamorphosed MUMRB with eclogite and meta-peridotite blocks along the southern part of the Mozitan-Xiaotian fault zone may represent the suture zone produced during the collision between the Yangtze and North China continental plates, which included the Yangtze subducted continental crust and paleo-oceanic relics.

Quartz and clinoenstatite exsolutions in clinopyroxene of garnet-pyroxenolite from the North Dabie Mountains,eastern China

The exsolution lamellae of quartz and clinoen-statite are idenfied in diopside of garnet-pyroxenolite from the North Dabie Mountain by transmission electron microscopy, which is interpreted that the lamellae are originally exsolved from a former ultra-high-pressure clinopyroxene due to decreasing of pressure. Study of petrography shows that there is compositional zoning hi the diopside itself. It is implied that the garnet-pyroxenolite had undergone intensive high-temperature granulite fades and high-amphibolitic fades retrogressive metamorphism, while the peridotite (the garnet-pyroxenolite’s host rock) emplaced the

基于矿质元素的赤霞珠葡萄酒产地溯源

为探讨基于矿质元素的赤霞珠葡萄酒产地溯源的可行性,分析新疆天山北麓产区与其他4个产区(宁夏、甘肃、河北、山东)赤霞珠葡萄酒中的23种矿质元素含量,结合多元统计方法,构建有效的葡萄酒产地溯源模型。结果表明:天山北麓与宁夏、甘肃、河北、山东产区葡萄酒中P、Mg、Sr、Ti、Al、Cu、Ba具有显著(p<0.05)或极显著差异(p<0.01),可以作为区分不同产区葡萄酒的特征性元素。以23种矿质元素为依据的Fisher判别分析,筛选出P、Sr、Al 3种对产地判别显著的元素,建立的判别函数对天山北麓和其他4个产区葡萄酒的初始验证和交叉验证整体正确判别率分别为96.43%和89.29%。基于矿质元素分析能够对赤霞珠葡萄酒进行产地溯源,区分新疆天山北麓与宁夏、甘肃、河北、山东产区的葡萄酒。

阴山北麓农牧交错带马铃薯脱毒种薯品种比较试验

为筛选出适宜于阴山北麓农牧交错带全国马铃薯种薯主要生产基地的品种,促进产业发展,将持证种薯企业30个马铃薯品种的原种进行比较试验。结果表明,马铃薯不同品种间的产量、商品薯率、单株平均结薯个数、单株不同重量平均结薯个数、淀粉含量和干物质含量均达极显著差异。30个品种的产量为21~70 t/hm^(2)、商品薯率为23.4%~94.6%、单株结薯个数为3.3~13.3个、干物质含量为15.5%~28.0%、淀粉含量为9.8%~22.3%。最高产量在60 t/hm^(2)及以上有4个,分别为冀张薯12号、中加16号、民丰12号和中加7号;最低产量在25 t/hm^(2)及以下有2个,分别为中薯早43和东农310,其余在45~60 t/hm^(2)有20个,在30~45 t/hm^(2)有4个。商品薯率较高的为京张薯1号、冀张薯12号和京张薯3号,平均为93.3%;商品薯率最低的是东农310,为23.4%。单株结薯总个数最高的是华颂58,平均为13.3个;较低的品种有5个,分别为后旗红、青薯9号、京张薯1号、中薯早43号和晋薯16号,平均为3.9个;150 g以上结薯个数东农310最低,为0.2个。干物质含量最高的是中加11,为28.1%;较低的是中加2号、中加7号和华颂香早,平均含量为15.9%。淀粉含量经聚类分析,分为高、中和低淀粉品种3种类型,东农310和中加11为高淀粉品种,平均含量为21.28%。

阴山北麓旱作区主要作物需水量及需水规律分析

为分析阴山北麓旱作区主要作物需水量和离水规律,根据阴山北麓地区作物和气候资料,计算该地区主要作物的需水量,并对不同作物水分利用情况进行评价。结果表明:阴山北麓旱作区主要栽培作物在不同生育阶段对水分的需求量不同,各作物需水量大小依次为:向日葵>玉米>多年生苜蓿>马铃薯>莜麦>春小麦,并分析作物需水与作物生长的关系。考虑到作物在该地区产量和种植面积的优势,应优先考虑马铃薯的种植。玉米和多年生苜蓿是阴山北麓旱作区重要的饲草料作物,由于该地区热量和水分不足,推广大面积种植受到制约。综上所述,基于水资源高效利用的优化作物布局,能够促进该地区水资源合理利用和农牧业的可持续发展。

内蒙古阴山北麓马铃薯品种适应性的比较试验

为筛选出适宜内蒙古阴山北麓的马铃薯品种,促进马铃薯产业高效发展,特对当地有一定种植面积的17个马铃薯品种进行适应性比较试验,其中冀张薯12号为对照。结果表明,从成熟期的聚类分析,“早熟”的品种仅有一个,珍妮,“中晚熟”的品种有中薯18号、褐色布尔班克、北方008、冀张薯12号、华颂7号和北方007,其余品种为“中熟”。株高方面北方,008的处于显著最高水平,中薯18号、褐色布尔班克、北方007、希森3号和久恩1号与对照品种冀张薯12号差异不显著,其他品种均显著低于对照品种冀张薯12号。商品薯率方面华颂34和华颂88均显著高于对照,华颂7号显著低于对照,其余品种与对照差异不显著。产量方面北方007和希森3号平均亩产显著高于对照,希森8号、褐色布尔班克、华颂66和华颂7号显著低于对照,其余品种与对照差异不显著。综合分析试验品种的商品率和产量,华颂34、华颂88、北方007、希森3号、中加2号、珍妮、久恩1号、华颂34、希森6号、中加1号、北方008、中薯18号和冀张薯12号均可在当地大面积推广,其余品种有待于进一步试验验证。