Bottleneck of Modern Agricultural Development and Countermeasures in Qinzhou in the Context of Beibu Gulf Economic Zone

The situation of agriculture in Qinzhou was introduced firstly.And then,the bottleneck of the development of modern agriculture in Qinzhou was pointed out,which including considerable effects of natural disasters,insufficient agricultural investment,backward infrastructure,inadequate agricultural ST innovation and promotion,low industrialization,incomplete agricultural chain,poor capacity in resisting market risks,and lagged manpower resources in rural areas.Finally,the countermeasures were proposed for development of Qinzhou＇s modern agriculture,including defining the characteristics of agricultural products,formulating scientific agricultural planning,strengthening agricultural science and technology innovation,training and on-site guidance,cultivation and brand strategy of agricultural leading enterprises,establishing agricultural disaster prevention mechanism and vigorously developing ecological agriculture tourism.

Geochemistry of Permian Mafic Igneous Rocks from the Napo-Qinzhou Tectonic Belt in Southwest Guangxi, Southwest China: Implications for Arc-Back Arc Basin Magmatic Evolution

The Napo-Qinzhou Tectonic Belt （NQTB） lies at the junction of the Yangtze, Cathaysia and Indochina （North Vietnam） Blocks, which is composed of five major lithotectonic subunits： the Qinzhou-Fangcheng Suture Zone （QFSZ）, the Shiwandashan Basin （SB）, the Pingxiang-Nanning Suture Zone （PNSZ）, the Damingshan Block （DB） and the Babu-Lingma Suture Zone （BLSZ）. On the basis of geochemical compositions, the Permian mafic igneous rocks can be divided into three distinct groups： （1） mafic igneous rocks （Group 1） from the Longjing region in the PNSZ and Hurun region in the BLSZ, which are characterized by intermediate Ti, P and Zr with low Ni and Cr contents; （2） mafic igneous rocks （Group 2） from the Naxiao and Chongzuo region in the DB, characterized by low-intermediate Ti, P and Zr with high Ni and Cr concentrations; and （3） mafic igneous rocks （Group 3） from the Siming region in the Jingxi carbonate platform of the northwestern margin of the NQTB, with intermediate-high Ti, P and Zr and low Ni and Cr contents. The Group 1 rocks yield a weighted mean 206 Pb/ 238 U age of 250.5±2.8 Ma and are geochemically similar to basalts occurring in back-arc basin settings. The Group 2 rocks exhibit geochemical features to those basalts in island arcs, whereas the Group 3 rocks show geochemical similarity to that of ocean island basalts. All three groups are characterized by relatively low ε Nd （t） values （-2.61 to ＋1.10） and high initial 87 Sr/ 86 Sr isotopic ratios （0.705309-0.707434）, indicating that they were derived from a subduction-modified lithospheric mantle and experienced assimilation, fractional crystallization, and crustal contamination or mixing during magmatic evolution. Accordingly, we propose the existence of an arc-back arc basin system that developed along the NQTB at the border of SW Guangxi Province （SW China） and northern Vietnam, and it was formed by continued northwestward subduction of the Cathaysian （or Yunkai） Block under the Yangtze Block, and northeastward subduction of the Indochina Block beneath the Yangtze Block during Permian time.

Mangrove forest degradation indicated by mangrove-derived organic matter in the Qinzhou Bay,Guangxi,China,and its response to the Asian monsoon during the Holocene climatic optimum

The response of mangrove ecosystems to the Asian monsoon in the future global warming can be understood by reconstructing the development of mangrove forests during the Holocene climatic optimum（HCO）, using proxies preserved in coastal sediments. The total organic matter in sediments of a segmented core, with calibrated age ranges between 5.6 and 7.7 cal. ka BP and corresponding to the HCO, from the Qinzhou Bay in Guangxi, China, is quantitatively partitioned into three end-members according to their sources： mangrove-derived, terrigenous,and marine phytoplanktonic, using a three-end-member model depicted by organic carbon isotope（δ13Corg） and the molar ratio of total organic carbon to total nitrogen（C/N）. The percentage of mangrove-derived organic matter（MOM） contribution is used as a proxy for mangrove development. Three visible drops in MOM contribution occurred at ca. 7.3, ca. 6.9, and ca. 6.2 cal. ka BP, respectively, are recognized against a relatively stable and higher MOM contribution level, indicating that three distinct mangrove forest degradations occurred in the Qinzhou Bay during the HCO. The three mangrove forest degradations approximately correspond to the time of the strengthened/weakened Asian winter/summer monsoon. This indicates that even during a period favorable for the mangrove development, such as the HCO, climatic extremes, such as cold and dry events driven by the strengthened/weakened Asian winter/summer monsoon, can trigger the degradation of mangrove forests.

Development Status and Countermeasures of Passiflora spp.Seedling Industry in Qinzhou,Guangxi

In recent years,the development trend of passion fruit seedling industry in Qinzhou,Guangxi is good,but on the whole,it is still in its infancy and the development of the industry is fragile.This paper briefly described the development status and existing problems of the passion fruit seedling industry in Qinzhou,Guangxi,and put forward reasonable suggestions in order to promote the healthy development of the passion fruit seedling industry,increase farmers’income and prosper rural economy.

A study of Qinzhou coastal tourism culture based on the development of Beibu Gulf Economic Zone

The 21 st century is the ocean century. The coastal tourism resource is an important part of marine resources. Coastal tourism has already been one of the fi elds with the fastest developing speed in modern tourism. Qinzhou, as one of the three coastal cities of Beibu Gulf Economic Zone in Guangxi Province, China, is very rich in the coastal tourism resources with greatly potential development. It has been developing rapidly these years. But there are still some problems. Firstly, the author gives an overview to the status of coastal tourism resources in Qinzhou and points out the existing problems; then the other uses the SWOT analysis method to briefl y analyze the advantages, disadvantages, opportunities and challenges for the development of the coastal tourism culture of Qinzhou; fi nally, the paper puts forward suggestions for sustainable development of coastal tourism culture to promote the sustainable development of Qinzhou tourism industry.

Technical Specification for Seed Production of Qinzhou Sea Red Rice(Chihe)

Sea red rice is a geographical indication agricultural product of Qinzhou City.It is suitable for growing in hydrochloric acid field with salinity of 2‰-20‰,and is a green and healthy food positioned in the medium and high-end rice market.The brand of Qinzhou sea red rice started to be established in November of 2019.In this paper,the technical specification for seed production of Qinzhou sea red rice is introduced from the aspects of seed production,breeding and harvest,so as to provide technical support for accelerating the popularization of characteristic varieties and the process of industrialization.

Guadalupian (Middle Permian) Radiolarian and Sponge Spicule Faunas from the Bancheng Formation of the Qinzhou Allochthon,South China

The Gujingling （古井岭） Section in Xiaodong （小董）, Guangxi （广西） Zhuang Autonomous Region, China, consists of cherts and siliceous siltstones, which belongs to the Bancheng （板城）Formation of the Qinzhou （钦州） allochthon. Three successive radiolarian assemblage-zones related to the Guadalupian （Middle Permian） appear in the section in the following ascending order： Pseudoalbaillella sp. aff. Pseudoaibailleila longicornis-Pseudoalbaillella fusiformis, Follicucuilus monacanthus, and Follicucuilus scholasticus-Foilicucullus porrectus. The radiolarian content in this section is generally greater than that of sponge spicules. The radiolarian fauna commonly consists of abundant Albaillellaria and spherical radiolaria with minor Latentifistularia and Entactinaria. The sponge fauna is composed mainly of hexactinellids with minor demosponges. These siliceous fossil faunal features, comparable with those in a deep basin of the western belt of the Phosphoria Basin in the western United States, indicate that the Bancheng Formation in the Gujingling Section was deposited in a basin deeper than 1 000 m. The siliceous siltstones in the section are characterized by inclusion of silt-sized quartz and no inclusion of sand-sized materials, suggesting that the Gujingling Section was located at least a few hundred kilometers from the South China Block in the Guadalupian.

基于GIS的钦州市暴雨洪涝灾害风险区划研究

随着全球气候变暖,气象灾害日益突出,暴雨洪涝灾害已成为影响人们生产和生活最严重的气象灾害之一。根据钦州市2000—2020年逐日降水数据及对应年份的社会经济数据,利用熵权法和加权综合评价法,从危险性、敏感性、易损性及防灾减灾能力4个方面对钦州市暴雨洪涝灾害风险进行分析,并建立相应评估模型,借助GIS技术开展钦州市暴雨洪涝灾害风险区划研究。研究可为钦州市防灾减灾工作决策提供有益参考,以提高钦州市暴雨洪涝灾害防预能力。

天水市秦州区古树资源现状分析

应用基于移动GIS的古树名木调查APP,对天水市秦州区古树进行了调查。结果表明,秦州区现有古树479株,分属于24科31属42种。在数量特征上,柏科Cupressaceae明显占优势,株数为220株,占总数的46%;其次是豆科Leguminosae和蔷薇科Rosaceae,其株数分别为137株、51株,占比分别为29%、11%。在结构特征上,树高、冠幅、胸围分别集中在6.0~27.0 m、5.5~31.0 m、81~650 cm。在年龄特征上,秦州区有一级古树186株,占比39%;二级古株90棵,占比19%;三级古树203株,占比42%。秦州区生长正常的古树有51株,占比11%;生长衰弱的古树有336株,占比70%;濒危的古树有92株,占总株数的19%;未发现死亡古树。古树生长环境良好的有187株,占比39%;中等163株,占比34%;差的有129株,占比27%。综上所述,天水市秦州区古树资源较丰富,但衰弱株数量占比明显高于正常株,加强古树保护和改善古树生长环境仍然是今后的一项重点工作。

粤西庞西垌地区非结构化地质信息机器可读表达与致矿异常区域智能预测

大数据挖掘与机器学习算法应用已成为成矿预测研究的重要趋势,但如何使非结构化地质数据进行机器可读表达成为需要克服的难点。本研究针对粤西庞西垌矿集区开展地层、岩性、断裂等非结构化地质信息面向机器可读的转换处理,并进而应用机器学习算法对水系沉积物地球化学测试数据和构造、地层等综合地质信息进行挖掘,提取致矿异常特征,最终实现智能圈定致矿异常找矿靶区。独热编码算法与空间加权主成分分析中的权重变量方法组合应用,实现了地层、岩性和断裂构造等非结构化地质信息的结构化转化,并最大限度地保留其所包含的地质信息。单分类支持向量机和自编码网络异常检测算法的应用,解决了研究区已知矿点与非矿点数据不平衡问题。对多源地质数据的集成和综合生成的预测结果与研究区铅锌矿床的空间分布和实际的地质构造情况相对一致,表明上述算法能够有效识别找矿潜力区并寻找潜在的矿床。与传统的勘查地球化学方法相比,本研究中的分析方法能够处理和集成多源的地质致矿信息,可应用于尚未发现矿床的找矿潜力区,提高发现矿床的可能性和找矿工作的效率。

“数商兴农”背景下农村电子商务发展对策研究--以天水市秦州区为例

随着乡村振兴战略的不断推进,农村电子商务也得到了空前的发展,“数商兴农”工程的提出,是新形势下发展数字商务振兴农业的新战略,也是发展农村电商的新举措。近年来,天水市秦州区在积极贯彻落实各项农村电商发展政策的同时,也出现了农村电商通行一公里建设、专业型电商人才缺少,农产品品牌化效应低下的发展困境,基于以上发展难题,天水市秦州区立足现实发展,提出政府主导、打通“一公里”建设、孵化“新农人”、培育“新人才”和强化本地特色产品品牌建设的对策建议,为秦州区农村电商发展注入新血液。

湘南科学深钻构造样式及其对区域成矿预测的启示

湘南科学深钻位于钦杭结合带中段桂阳县宝山矿区,终孔孔深3008.93 m。文章在岩芯地质-地球化学精细编录、测井等工作基础上,建立了岩性、构造、矿化蚀变、地球化学、岩石物性等精细剖面。科学深钻揭露构造行迹自上至下可分为3个构造层:①上部(韧)脆性构造层,构造样式以脆性断裂为主,层间滑动为次,间夹塑性变形;②中部脆韧性构造层,构造样式主要为顺层曲面劈理;③下部韧性构造层,构造样式以塑性变形为主,层间滑动为次,具塑性剪切特征。结合区域深部构造特征研究显示,该区处于北东向炎陵-郴州-临武深断裂带中,燕山期强烈活动诱发岩浆上侵至深断裂的上盘(深断裂北西侧),形成宝山-大坊花岗闪长斑岩脉带及其相关的铜铅锌银金矿、黄沙坪石英斑岩岩枝群及其相关的铅锌银矿、黄沙坪花岗斑岩岩枝群及其相关的钨锡钼铅锌矿。矿石硫化物δ^(34)S同位素研究表明,矽卡岩型铜铅锌矿中的硫来源于岩浆,脉状铅锌银金矿除岩浆热液硫外,有地层硫的加入。综合深部构造-岩浆岩特征及地球物理信息,文章提出:宝山中区-1350 m以深矽卡岩型铜矿找矿靶区、宝山至大坊之间的米筛井一带北东向脉状铅锌银金找矿靶区、黄沙寺矿区深部可能存在隐伏的花岗闪长斑岩及花岗斑岩,是寻找钨锡钼铋铜铅锌矿的找矿靶区。

基于激光雷达的钦州湾典型红树林生物量反演

试验区的红树林生物总量对于研究区的生态系统保护至关重要。以地面实测样地数据和激光雷达点云数据为基础,使用随机森林方法估算研究区红树林生物量,依据精度检验结果构建生物量估算模型,通过反演获得试验区红树林生物总量。结果表明:(1)研究区样地各样方的无瓣海桑的生物量介于0.55 kg·m^(-2)—13.57 kg·m^(-2),平均值为5.40 kg·m^(-2)。(2)采用随机森林模型对红树林生物量计算的训练集(R^(2)=0.9516、RMSE=0.8142、rRMSE=0.1486),及测试集(R^(2)=0.6598、RMSE=2.0276、rRMSE=0.3983),说明地表生物量估算模型计算的生物量与实测样地采样的数据计算的生物量基本吻合,随机森林算法拟合精度较高。(3)反演的研究区红树林生物总量为459.18 Mg,平均生物量为4.15 kg·m^(-2)。树高较高、胸径较大的单木红树林主要分布在潮沟附近以及研究区中南部。

基于国产资源一号02D卫星和机器学习算法的钦州湾滨海土壤盐分反演

以钦州湾滨海地区作为研究区,基于国产资源一号02D(ZY1-02D)多光谱卫星提取的相关特征参数,在Ada Booost、Light GBM、XGBoost、RFR以及Cat Boost五种不同机器学习算法的支持下,设置了5种不同的输入变量组合,并基于决定系数(R^(2))和均方根误差(RMSE)对不同模型的性能进行了评价.结果显示:研究区实测土壤盐分含量范围为0.740~10.352 g/kg,均值为1.739 g/kg;Cat Boost相较于Ada Booost、Light GBM、XGBoost、RFR有更好的预测性能,Cat Boost结合全变量组在预测阶段取得了最高精度(R^(2)=0.8317,RMSE=0.3957 g/kg);在全变量组中,纹理特征中的均值对土壤盐分含量最为敏感,贡献度最高;研究区土壤盐分含量预测值为0~8.784g/kg,均值为2.478g/kg,轻度盐渍土分布广泛,主要集中分布在研究区西部,在东部地区分布较零散.国产资源卫星遥感数据结合Cat Boost模型在钦州湾滨海土壤盐分反演中表现出较好的性能,可为大规模估算土壤盐分含量提供一种新的方法和思路.

基于海洋环境容量的钦州湾入海排污口选划研究

针对钦州湾海域因围填海活动导致原有排污口功能受限的问题,进行了排污口选址的优化研究。钦州湾围填海工程的实施改变了海域的水动力特性,对排污口的排放效率和环境质量产生了显著影响。基于MIKE21模型,对钦州湾的水动力条件和环境质量进行了深入的数值模拟分析。研究预测了18个潜在排污点位的环境容量,发现在当前岸线条件下,特定排污口具有32万m^(3)/d的处理能力,满足了近期的排污需求;研究针对中远期规划,提出了两个排污口的组合排放方案,预计总排污量可达56万m^(3)/d,有效应对了近100万m^(3)/d的排污需求。此外,还提出了提高污水处理厂尾水排放标准,将总氮排放浓度从15 mg/L提标至10 mg/L,总磷排放浓度从0.5 mg/L提标至0.3 mg/L,以进一步提升排污口的环境容量,为钦州湾海域的环境保护和可持续发展提供了决策支持。研究解决了超大排污需求(近100万m^(3)/d)的难题,且提出的双排污口组合方案丰富了入海排污口选址研究思路。

钦州湾沉积物中重金属的多元统计分析:空间关系、生态风险和来源识别

海湾是海洋和陆地相互作用和人类活动最强烈的区域,沉积物中重金属的含量和分布都受到人类活动的影响。为了探究钦州湾沉积物中重金属的含量水平、污染程度和可能来源,本研究分析了钦州湾表层沉积物中Cu、Pb、Zn、Cd、Cr、Hg和As的含量及空间分布,采用地质累计指数(Igeo)和潜在生态风险指数(PERI)定量分析了重金属的污染程度和生态风险,并利用自组织映射(SOM)和正定矩阵因子分解法(PMF)模型评估了重金属的可能来源。结果表明:钦州湾表层沉积物重金属中Zn的平均含量最高,Hg平均含量最低;除个别站位的Pb含量符合海洋沉积物质量第二类标准外,其他重金属含量均符合海洋沉积物质量第一类标准;Igeo结果表明钦州湾表层沉积物主要的污染元素为Pb、Hg和Cu;PERI结果表明Hg是钦州湾表层沉积物主要的生态风险元素。SOM和PMF模型结果表明钦州湾表层沉积物重金属主要受自然来源、农业活动、工业生产活动的共同影响,各来源的相对贡献率分别为39.65%、29.15%和31.20%。

东乡盆地虎圩金多金属矿床金属沉淀机制:来自矿物组合和微量元素的限制

钦杭结合带中部的虎圩金多金属矿床为东乡火山岩盆地内典型热液矿床,基础地质研究表明该矿床赋矿围岩为侏罗纪-白垩纪石英闪长玢岩和流纹质火山碎屑岩,矿体受断裂构造控制,呈NW向脉状展布,然而有关该矿床的成因类型、金属沉淀机制和成矿过程研究尚欠缺。本文针对该矿床开展详细矿相学和黄铁矿微量元素研究。结果显示,从早到晚,该矿床矿化过程可分为四个阶段:石英-黄铁矿阶段(S1)、石英-黄铁矿-赤铁矿阶段(S2)、石英-多金属硫化物阶段(S3)和石英-赤铁矿阶段(S4)。金主要以自然金的形式存在于S2和S4阶段中;S2阶段黄铁矿(Py2)明显富集Pb、Sb、Bi、W、V、Sc、U、Al和Ti等元素,不同阶段黄铁矿中不可见金含量均较低(均值0.8~1.7μg/g),As(均值517~931μg/g)与Au整体上正相关,局部存在解耦,微量元素变化主要受控于黄铁矿中不同类型矿物包裹体。综合地质特征、矿物组合、矿物结构、微量元素和热力学计算分析显示,该矿床为中硫型浅成低温热液矿床,流体沸腾和流体混合导致的氧逸度快速上升分别是S2和S3阶段自然金沉淀的关键因素,而黄铁矿中的不可见金主要受控于As对黄铁矿晶格的改变,局部受控于动力学过程控制的黄铁矿晶格缺陷。

广西钦州湾表层沉积物常量元素分布特征及其地质意义

为探讨钦州湾表层沉积物常量元素分布特征,了解该海域沉积环境和物质来源,采集测定了钦州湾海域121件表层沉积物的粒度、常量元素含量,分析了常量元素组合特征、空间分布规律并解析其来源。研究结果表明,钦州湾海域表层沉积物共有8种类型,粒度组成以砂、粉砂为主;常量元素组成较为稳定,SiO_(2)、Al_(2)O_(3)、Fe_(2)O_(3)和CaO 4种组分约占沉积物总量的95.54%,其中SiO_(2)和Al_(2)O_(3)含量最高,平均含量分别为73.23%和8.71%;与上地壳元素平均值(UCC)相比,SiO_(2)、MnO和TiO_(2)含量相对富集,其他元素则为亏损。Al_(2)O_(3)、MgO、TiO_(2)、K_(2)O、Na_(2)O空间分布模式相似,且5种组成之间均呈显著正相关,说明其分布受控因素相似。以Al为参考计算研究区9种常量元素富集因子(EF),结果表明绝大部分元素均来源于上地壳,部分站位可能受到其他因素的影响。相关性和R型因子综合分析表明,研究区10种常量组分可划分为3类,第1类包括SiO_(2)、Al_(2)O_(3)、Fe_(2)O_(3)、MgO、MnO、TiO_(2)、K_(2)O、Na_(2)O,主要来源于陆源碎屑沉积;第2类为CaO,主要代表海洋生物源;第3类为P_(2)O_5,代表海水养殖源。利用PCA-MLR模型对3种来源进行解析,得出其相对贡献率分别为46.14%、15%和38.86%。

气候变化背景下广西钦州荔枝气象灾害演变特征及应对策略

通过对1960—2021年广西钦州荔枝主产区气象要素进行统计,结合荔枝生物学特性及农业气象灾害指标,分析钦州荔枝生产的主要农业气象灾害演变特征及影响。结果表明:1960—2021年钦州市荔枝主产区冬季冻害、春季(花期)寒害呈减轻趋势,大风、花期高温热害等灾害呈加重趋势,果实膨大期干旱情况呈先下降后上升趋势,果实膨大后期降雨量偏多的频率大。根据农业气象灾害演变特征提出应对策略,为荔枝生产趋利避害、提质增效提供科学参考。

钦州湾波流耦合作用泥沙输运特性研究

为定量评估钦州湾三墩公路东侧海域清淤对当地水动力环境以及泥沙输运特性的影响,基于平面二维数学模型开展波流耦合作用泥沙输运特性研究,在验证计算结果可信的条件下,探讨了工程海域疏浚对水流特性分布、纳潮量变化以及工程后年回淤量的影响。分析结果表明:清淤将导致工程海域的海流流速平均降低4~8 cm/s,局部流速降低达到30 cm/s,但是对该区域纳潮量增加贡献幅度有限,仅微幅增加0.065%;由于清淤导致流速降低,使得工程海域大部分区域呈淤积状态,平均回淤强度达2~4 cm/a,近岸区域回淤强度达8~10 cm/a,局部区域由于流速增大,冲刷强度达到每年1~2 cm。