Basalt Petrology, Water Chemistry, and Their Impact on the CO_(2) Mineralization Simulation at Leizhou Peninsula Sites, Southern China

Mineral carbonation, which precipitates dissolved carbon dioxide(CO_(2)) as carbonate minerals in basaltic groundwater environments, is a potential technique for negative emissions. The Leizhou Peninsula in southwest Guangdong province has extensive basalt, indicating a promising potential for CO_(2) storage through rapid mineralization. However, understanding of the basic geological setting, potential, and mechanisms of CO_(2) mineralization in the basalts of the Leizhou Peninsula is still limited. The mineralization processes associated with CO_(2)storage at two candidate sites in the area are investigated in this paper: Yongshi Farm and Tianyang Basin(of the dried maar lake). Petrography,rock geochemistry, basalt petrophysical properties, and groundwater hydrochemistry analyses are included in the study. Numerical simulation is used to examine the reaction process and its effects. The results show that basalts in the study areas mainly comprise plagioclase, pyroxene, and Fe–Ti oxides, revealing a total volume fraction exceeding 85%. Additionally, small amounts of quartz and fayalite are available, with volume fractions of 5.1% and 1.0%, respectively. The basalts are rich in divalent metal cations, which can form carbonate minerals, with an average of approximately 6.2 moles of metal cations per 1 kg of rock. The groundwater samples have a pH of 7.5–8.2 and are dominated by the Mg–Ca–HCO3 type. The basalts demonstrate a porosity range of 10.9% to 28.8%, with over 70% of interconnected pores. A 20-year geochemical simulation revealed that CO_(2) injection dissolves primary minerals, including anorthite, albite, and diopside, while CO_(2)mineralization dissolves precipitation secondary minerals, such as calcite, siderite, and dolomite. Furthermore, a substantial rise in pH from 7.6to 10.6 is observed in the vicinity of the injected well, accompanied by a slight reduction in porosity from 20% to 19.8%. Additionally, 36.8% of the injected CO_(2) underwent complete mineralization within five years, revealing an increasing percentage of 66.1% if the experimental period is extended to 20 years. The presence of abundant divalent metal cations in basalts and water-bearing permeable rocks in the Leizhou Peninsula supports the potential for mineral carbonation in basalts, as indicated by the geochemical simulation results. Additional research is necessary to identify the factors that influence the CO_(2) mineralization, storage, and sensitivity analysis of basalt in the Leizhou Peninsula.

On the Phonology Characteristics of Leizhou Dialect in Malaysia

Based on first-hand materials obtained from field investigations in Malaysia, the results show that: firstly, there are 17 initials in the Leizhou dialect of Malaysia, including the implosives initial and the [f] initial. The pronunciation of Leizhou dialect in China is already rare, some of which are retained in the Leizhou dialect of Malaysia. Its initial consonant is borrowed from local Hua Yu or other Chinese dialects. Secondly, the Leizhou dialect of Malaysia has 46 finals. The pronunciation and timbre of some of its vowels are similar to the Yue dialect of Malaysia [&#592] main vowel. Thirdly, there are 8 monosyllabic tones in the Leizhou dialect of Malaysia. The pronunciation and tone of some of its characters are similar to the Xia Yin entering tone of Yue dialect of Malaysia.

Distribution and risk assessment of heavy metals in surface sediments of coastal mudflats on Leizhou Peninsula,China

Mudflats play a vital role in maintaining the dynamic balance between sea and land.To understand the characteristics,sources,and pollution risks of six heavy metals(As,Cd,Cr,Cu,Hg,and Pb)in the coastal mudflats on the Leizhou Peninsula,257 surface sediment samples were studied using mathematical statistics,correlation analysis,and factor analysis.The results show that the overall concentrations of these heavy metals are low although there are several high abnormal points in the local areas.The strong correlation between these heavy metals indicates that the sources of some of the metals are similar,yet their elemental combinations in different cities(counties)varied.According to the calculated enrichment factor(EF),anthropogenic activity-induced heavy metals were determined in order of decreasing influence:As,Cd,Pb,Cr,Cu,and Hg.The low EF values of Hg indicate that it does not present as a contaminant in the study area,while low values of Cr and Cu from the Lianjiang City suggest that these two metals were also attributed to natural sources.The presence of As,Cd,Cr,Cu,and Pb from the remaining cities(counties)should be influenced by anthropogenic activities.The overall potential ecological risk index indicates that the ecological risks posed by the six analyzed heavy metals to the Leizhou Peninsula mudflats,in order of decreasing risk,are Cd,As,Hg,Pb,Cu,and Cr.It is noteworthy that only Cd in Lianjiang City demonstrated substantial ecological risk.Other examined heavy metals in other cities of the study area showed slight ecological risk.

The mangrove and its conservation in Leizhou Peninsula, China

Leizhou Peninsula, located at southem end of mailand China, has 9 284.3 ha mangrove distributed more than 100 sites along its inlets and open coastlines. This paper presents the surveys on mangrove area in Leizhou Peninsula during 2000 and 2008, especially the survey in the eight major mangrove areas in 2002. The flora recorded in mangrove systems includes 69 large algea species, 13 native true mangrove species, nine native semi-mangrove species, and another seven intoduced true mangrove species with Sonneratia apetala as the quickest growing exotic mangrove species dominatant in the mangrove plantations, and more than 100 land flora species, consisting of 17 main mangrove associations. The plant biodiversity habitats remained mainly small patches and diverse, and were becoming worse under the intensive disturbance of human acitivities and coastal pollutions, which decreased the value of mangrove coasts as the important sites for flying-by migrating birds in Leizhou Peninsula. The effective mangrove conservation measures should be implemented.

Study on Sonneratia apetala productivity in restored forests in Leizhou Peninsula, China

The exotic Sonneratia apetala in Leizhou Peninsula, has shown outstanding fast-growing ability in restored mangrove forests, at the middle and high tide intertidal zone, with year-round fresh water input from drainage. By setting plot and selecting standard tree, investigation and measurement on height growth, diameter growth, biomass, productivity, and so on, were made in a S. apetala plantation at age of six at Lanbei, Fucheng, Leizhou Peninsula in May 2001. The investigating results showed that the mean annual height growth of plantation was 2.03 m and mean annual growth of diameter at breast height (DBH) was 2.35 cm. There exists a significant correlation between the diameter at ground surface (DGS) and DBH. The average biomass of a single standard tree in dry weight was 95.647 kg/m2. A ratio of above-ground biomass to under-ground biomass was 1.60. The stand biomass of unit area was 22.955 kg/m2, singletree wood volume was 88.23 dm3, and the annual wood volume productivity (PA) of the same year was 0.407. The forest energy accumulation was 424.851 MJ/m2, with annual solar energy fixing rate of 40.68 ×10-7%. It is concluded that S. apetala species had characteristics of outstanding high biomass accumulation and could be used as coastal planting tree species in southern China.

The mesoscale numerical simulation of the flow field of the Hainan Island and the Leizhou Peninsula

The flow field over Hainan Island and the Leizhou Peninsula in summer and winter is discussed with three-dimensional mesoscale model developed in the University of Virginia and using the representative meteorological data of January and July.Simulation results indicate that the local weather characteristics over the Hainan Island are distinctly influenced by theWuzhi Mountain terrain. The cloudy or rainfall weather over the northeast of the Wuzhi Mountain occurs easily, under proper large-scale conditions of flow, temperature and humidity. while west wind prevails. The overcast or rainfall weather is often induced by strong convection in the afternoon over west of the Hainan Island under easterly prevailing wind.

Coastal geomorphic evolution at the Denglou Cape, the Leizhou Peninsula

The Denglou Cape, southwest of the Leizhou Peninsula, is the most typical tropical coast in the continent of China.The coastal geomorphic development basics of the geology and Quaternary environment change are discussed. Aerial photograph interpretation with fieldwork is applied to draw the outlines of geomorphic types. Based on the investigative data, the exogenic forces and marine organism conditions concerning tropical coast development in the area are expounded, and coastal dynamo-deposition geomorphic bodies are analysed, mainly with sea cliff-abrasion platform,barrier-lagoon system, modern beach, coral reef and mangrove tidal flat, and the general process of coastal evolution at this area, as well as coastline changes since middle Holocene transgression.

The mangrove and its conservation in Leizhou Peninsula,China

Leizhou Peninsula, located at southern end of mailand China, has 9 284.3 ha mangrove distributed more than 100 sites along its inlets and open coastlines.This paper presents the surveys on mangrove area in Leizhou Peninsula during 2000 and 2008, especially the survey in the eight major mangrove areas in 2002.The flora recorded in mangrove systems includes 69 large algea species, 13 native true mangrove species, nine native semi-mangrove species, and another seven intoduced true mangrove species with Sonneratia apetala as the quickest growing exotic mangrove species dominatant in the mangrove plantations, and more than 100 land flora species, consisting of 17 main mangrove associations.The plant biodiversity habitats remained mainly small patches and diverse, and were becoming worse under the intensive disturbance of human acitivities and coastal pollutions, which decreased the value of mangrove coasts as the important sites for flying-by migrating birds in Leizhou Peninsula.The effective mangrove conservation measures should be implemented.

Evolution of Fire-sealing Gable Walls' Diversity in Leizhou Traditional Vernacular Red-brick Dwellings

Peculiar color and form of Leizhou red-brick folk dwelling distinguishes it from other vernacular dwellings in Lingnan region(south of the Five Ridges, referring to the current Guangdong and Guangxi). The fi re-sealing gable wall(hereinafter referred to as fi re-sealing wall) in brilliant colors, diversifi ed forms and exaggerated shapes is a remarkable symbol of local dwellings. Originating from Fulao traditional vernacular dwelling and inheriting its advantages, fi re-sealing wall of Leizhou red-brick vernacular dwelling has shown diversity for the infl uence of immigrants, regional cultures, social background and economic status, and formed its own features in color, form and decoration. On the basis of fi eld investigation, this paper described diversifi ed features of the fi re-sealing wall of Leizhou red-brick vernacular dwelling, analyzed the causes of its diversity from the perspectives of aesthetics, function and technology, and explored the harmonious living philosophy implied by its function, form and art.

A Mineralogical Study of Diatomite in Leizhou Peninsula

In this paper diatomite samples taken from the Leizhou Peninsula have beenstudied by chemical analysis, DTA, TG, XRD, IR, SEM and X-ray Energy Spectroscopy.The study shows that the diatomaceous genera and species and their organic contents arevariable with buried depth, from Melosira to Stephanodiscus and then to Cyclotella.Various impurities in the samples, such as quartz, kaolinite and montmorillonite indicatedifferent sedimentary environments. When heated, the diatom would change in shape dueto the phase transformation in which amorphous silica crystallized from disordered opal toordered cristobalite. The temperatures of phase transformation are different for variousdiatorns due to the presence of different impurities and constituents of diatomaceousgenera and species.

A Preliminary Paleomagnetic Result of Quaternary Drilling Core from Southern Leizhou Peninsula, Guangdong Province

orientated samples were collected from Drilling Core ZK1 in southern Leizhou Peninsula for the study of Quaternary paleomagnetic strato\|chronology. The polarity measurement results indicate that the core recorded paleomagnetic information in three main parts: the upper one of the core, from the ground surface to the depth of 39 m, is normally magnetized in polarity, the middle one, from 39m to 210m in depth, mainly shows reversed polarity and the lower one recorded normal polarity again. They correspond to the Brunhes normal chron, the Matuyama reversed chron and the Guass normal chron in the geomagnetic polarity time scale, respectively. The age of the core could be over 3.4 Ma. Meanwhile, the magnetic susceptibility was measured and its result is significant for stratigraphic division and paleoclimatic research.

Paleomagnetic Results of the Red Soil-Volcanic Rock Series of Yingfengling Section, Southern Leizhou Peninsula

The Yingfengling section composed of red soil and volcanic rocks can be distinguished into 8 stratigraphic units and 4 red soil-volcanic rock cycles. 64 paleomagnetic-orientated samples were collected from the bottom to the top of the section. Natural remanent magnetization and magnetic susceptibility were firstly measured. All the samples were stepwisely treated with thermal or/and alternating fields. Four clear polarity segments were recorded in the section. Compared with the geo-magnetic polarity scale, the section was formed since the late Olduvai subchron, about 1.37 Ma.B.P.

北部湾—雷琼地区新生代古海岸线重建与琼州海峡演化

古海岸线重建能为理解全球气候变化和海陆格局演变提供重要的线索。笔者等基于钻孔资料重建了北部湾—雷琼地区新生代以来古海岸线变迁与琼州海峡演变过程。结果表明,北部湾—雷州半岛—海南岛(雷琼地区)新生代经历了古近纪北部湾古湖、新近纪—早更新世早期古琼州海峡、早更新世晚期—晚更新世峡湾和全新世琼州海峡四个演化阶段。古近纪北部湾形成NEE向互不连通的断陷盆地并充填河—湖相沉积,渐新世晚期海水间歇性入侵北部湾古湖并连通孤立的断陷盆地;中新世早—中期(23.3~10.4 Ma)南海西北部海岸线快速后退,北部湾古湖演变为古琼州海峡,中新世晚期—上新世(10.4~2.58 Ma)海岸线继续后退形成宽阔的古琼州海峡,早更新世早期海退及火山喷发导致古琼州海峡萎缩;早更新世晚期—晚更新世气候频繁波动控制了峡湾与陆地的不断转化,而末次盛冰期大幅度海退直接导致北部湾—雷琼地区从海转陆;15~12 ka BP以来海岸线快速后退并在12~11 ka BP期间短暂停留,北部湾再次由陆转海,之后海平面继续上升,琼州海峡于11 ka BP自西向东完全打开,至6 ka BP海平面达到现今海平面以上2 m左右,现今海陆格局形成。

近60年雷州半岛气象干旱变化特征及驱动因素分析

雷州半岛为中国华南农产品重要的主产区,区内水系大多独流入海,加上工程调蓄能力不足,干旱已成为制约当地经济发展的主要因素。通过计算不同尺度下的标准化降水蒸散指数(Standardized Precipitation-Evapotranspiration Index,SPEI)来分析雷州半岛气象干旱的变化特征,探究降水、气温和遥相关因素对雷州半岛干旱的影响。结果表明:①年尺度上雷州半岛干旱事件发生频率接近20%,北部呈现出显著湿润化的趋势,南部湿润化的趋势不显著,北部较易发生极端干旱事件;②降水与气温均与SPEI呈显著性相关关系,且降水与干旱的相关性更强;③海洋尼诺指数(Ocean Nino Index,ONI)与次年SPEI的负相关性显著,说明ENSO(EI NiÑo-Southern Oscillation)事件与干旱的关系密切,且当发生东部型和中部型ENSO暖事件时,对干旱的影响存在差异。研究成果可为即将实施的雷州半岛灌区工程提供参考。

水利开发影响下雷州滨海洋田区传统聚落景观特征研究

被誉为“广东第三大水利枢纽”的雷州滨海洋田区,经过历代水利开发与围海造田,建成了集防洪、防潮和灌溉于一体的综合水利体系,并在此基础上孕育出独特的传统聚落景观。以水利开发为视角切入,从时空上对滨海洋田区的水利发展历程和水利系统结构进行梳理,将其分为三大发展阶段和四大功能结构单元;进一步从宏观聚落空间分布、中观聚落景观格局和微观居住地景观特征进行多层级分析;最后从“人-地-海”互动关系揭示了滨海洋田区传统聚落景观的形成机制,为区域内传统聚落的保护和发展提供理论借鉴。

非遗传承下雷州石狗IP形象的创新设计研究

雷州石狗是广东雷州半岛地区独特的民间艺术,拥有悠久的历史和深厚的文化内涵。然而,在现代社会的发展中,这一宝贵的非物质文化遗产面临着传承困境和市场认可度低的问题。本文将探讨如何在非遗传承的背景下,深入挖掘“雷州石狗”文化并对雷州石狗IP形象进行创新设计,使其更好地适应当代审美和市场需求,从而实现文化传承和产业发展的双赢。

雷州半岛红树林鱼类群落结构及其与人类活动强度的关系

水产养殖、城镇建设等引起的土地利用变化使红树林生态系统遭受严重破坏,是红树林生物多样性面临的主要威胁之一。了解雷州半岛红树林鱼类群落结构,探究人类活动强度对鱼类群落结构的影响,对红树林鱼类资源保护至关重要。基于2021—2022年雷州半岛7片红树林共21条潮沟的鱼类数据,结合周边土地利用数据,研究鱼类群落结构及其与土地利用类型的关系。结果显示,共采集鉴定鱼类49种,隶属于8目25科,鲈形目鱼类最多,共33种占总种类数的75.5%,其中,虾虎鱼科种数最多,共15种占30.6%;食性上,主要为杂食性和肉食性鱼类,分别为53.06%和44.90%;各红树林Shannon-Wiener多样性指数在秋冬春三季的变化范围均为0—2.5,Simpson多样性指数均为0—0.9;各红树林鱼类个体数、物种数和生物量均存在显著差异(P>0.05);除秋季北潭与流沙湾的鱼类群落无显著差异(P>0.05)外,其余红树林间的鱼类群落在三个季度均有显著差异(P<0.05);人类活动强度、红树林面积和东西岸对鱼类多样性指数、个体数、物种数和生物量均有显著的主效应和交互效应(P<0.05);青斑细棘虾虎鱼Acentrogobius viridipunctatus等杂食性鱼类丰度与城镇用地、耕地和林地的面积占比呈正相关,眶棘双边鱼Ambassis gymnocephalus等肉食性鱼类丰度呈负相关,尼罗罗非鱼Oreochromis niloticushh等鱼类丰度与养殖塘面积占比呈正相关。研究结果表明人类活动对鱼类群落结构已产生负面影响,对红树林周边土地利用的合理规划可作为鱼类保护与利用的重要手段。

雷州半岛地下水水质空间分布特征及铁、锰、pH超标的水文地球化学成因探析

对广东省雷州半岛2009—2017年地下水环境质量调查项目涉及的102个钻孔的水化学数据进行分析,发现该区域地下水的铁(Fe)、锰(Mn)含量和pH普遍超标,导致当地地下水水质以Ⅳ~Ⅴ类居多,不适宜直接作为生活饮用水。其中,中层含水层的Fe、Mn超标最显著,且二者具有十分一致的水文地球化学行为特征,因此,该层是解析超标机理的关键层位。松散沉积含水层的Fe、Mn、pH超标问题比基岩裂隙溶隙含水层和交互含水层更突出。湛江组和北海组两个相邻松散岩类地层均含有丰富的铁锰质矿物或结核,应加强对这两个地层的地球化学分析,以进一步解析相关指标超标的地球化学机理。最后,就该区域地下水水质超标机制研究与水质管控提出了建议。

雷州山羊品种特性及相关遗传调控研究进展

雷州山羊主要分布于广东雷州半岛和海南岛一带,是粤西地区的优良地方品种及中国国家地理保护品种,是广东主要的肉用山羊品种之一。目前雷州山羊群体面临着品种退化、经济性状及个体稳定性差等问题,这给雷州山羊产业的高质量发展和遗传育种工作带来极大挑战。本文论述了雷州山羊的品种特性,系统阐明了雷州山羊在肌肉生长发育、繁殖、毛色性状的遗传调控,总结了当前育种中存在的问题并分析了雷州山羊遗传育种研究的未来方向,旨在全面了解雷州山羊遗传育种研究的最新成果和前沿动态,为进一步推动该品种的遗传改良和优化提供科学依据。

雷州山羊TBX 15基因多态性及其与体尺性状的关联分析

【目的】本研究旨在筛查雷州山羊T盒子转录因子15(TBX15)基因潜在的单核苷酸多态性(SNP)位点,并分析其与体尺性状的关联性,为雷州山羊分子选育提供理论支撑。【方法】采集78只雷州山羊血样提取基因组DNA,利用PCR扩增和直接测序法检测TBX 15基因SNP位点,并分析其遗传多样性;采用SPSS 23.0软件分析TBX 15基因多态性与雷州山羊体高、体长和胸围等体尺性状的关联性;利用HaploView软件进行TBX 15基因SNP位点的连锁不平衡和单倍型分析。【结果】在雷州山羊TBX 15基因内含子上发现3个SNPs位点:g.96346139 A>G、g.96345894 T>C和g.96330058 G>A,均存在3种基因型,优势基因型分别为GG、CC和AA;卡方检验结果表明,其均处于Hardy-Weinberg平衡状态;多态信息含量(PIC)分别为0.309、0.285及0.294,均为中度多态(0.25<PIC<0.50)。关联分析结果发现,雷州山羊TBX 15基因g.96346139 A>G位点GG基因型个体的体高、十字部高和体斜长均显著高于AA基因型(P<0.05);g.96345894 T>C位点CC基因型个体的体高、十字部高、体斜长和胸深均显著高于TT基因型(P<0.05);g.96330058 G>A位点GG基因型个体的胸深显著低于其他2种基因型(P<0.05)。在单倍型和连锁不平衡分析中发现,3个SNPs位点间存在强连锁关系(R 2>0.33),有5种主要单倍型,其中优势单倍型是ACG,其概率为0.716。【结论】雷州山羊TBX 15基因3个SNPs位点对体高、体斜长等体尺指标具有显著影响,且该3个位点间具有强连锁关系,单倍型ACG可作为雷州山羊选育的候选标记。