海南东部沿岸河流和潟湖中溶存甲烷的分布及通量   总被引：1，自引：0，他引：1  

韩玉  张桂玲  赵玉川 《热带海洋学报》2012,(2):87-95

甲烷(CH4)作为大气中重要的温室气体,直接或间接地影响全球气候变化。于2009年3月27日至4月15日对海南东部河流(文昌河、文教河、万泉河)、潟湖(八门湾、博鳌、小海和老爷海)等进行了调查,采集了表层和部分底层水样,对溶解CH4浓度进行了测定并初步估算了其水-气交换通量。结果表明,文昌河、文教河受人为活动影响较大,表层CH4饱和度较高,分别为(60664±25118)%、(38582±26339)%,污水输入、红树林输入和现场产生是其CH4的主要来源。万泉河表层CH4饱和度为(9472±5594)%,现场产生是其水体溶存CH4的主要源。八门湾、博鳌、小海和老爷海潟湖表层水体溶存CH4均处于过饱和状态,但其饱和度远小于入湖河流,分别为(2471±2937)%、(5692±3435)%、(546±251)%和(6878±4635)%,其中河流输入、地下水和红树林间隙水输入、现场产生是潟湖中CH4的主要来源,水体中CH4的氧化和水-气交换是潟湖中CH4的主要汇。初步估算出文昌河和万泉河CH4的水-气交换通量分别为5967.0±5142.1和496.2±335.9μmol·m 2·d 1,八门湾、博鳌、小海和老爷海潟湖的水-气交换通量分别为528.7±625.0、441.7±473.3、26.6±21.6和1287.8±1453.3μmol·m 2·d 1。海南东部河流、潟湖是近岸水体及大气CH4的净源。  相似文献   

The role of benthic macrophytes and their associated macroinvertebrate community in coastal lagoon resistance to eutrophication     

Javier Lloret  Arnaldo Marín 《Marine pollution bulletin》2009,58(12):1827-1834

Eutrophication is widely recognised as one of the major menaces to coastal environments, particularly enclosed bays and lagoons. Although there is a general understanding of the consequences of eutrophication in these systems, there is a lack of sufficient knowledge concerning biotic feedbacks that influence eutrophication patterns and the resistance capacity of coastal environments.In this paper, the isotope ratios of main producers and consumers of a Mediterranean lagoon were examined in order to elucidate the fate of anthropogenic inputs from the main watercourse flowing into the lagoon.The results of the study of stable isotope data in the Mar Menor lagoon reflected that the whole benthic community plays an important role as a natural ‘filter’ that removes excess nutrients from the water column and stores them in the sediments, thereby enhancing lagoon resistance to eutrophication.  相似文献   

黔南桂北早石炭世寺门煤系两种不同古地理类型的比较     

潘伟尔 《现代地质》1990,4(2):33-34,T001

本文通过黔南桂北红茂煤田与罗城煤田早石炭世寺门煤系的主要特征和在垂向上、横向上沉积环境变化的对比,认为红茂聚煤盆地与罗城聚煤盆地在早石炭世分别属于两种不同的古地理类型:前者为三角洲;后者为泻湖。同沉积构造活动导致的应力海岸对此二煤盆的同期异相起了重要作用。这对于研究华南早石炭世聚煤规律有重要意义。  相似文献   

广东博贺澙湖潮滩的冲淤变化及其动力作用分析          下载免费PDF全文

戴志军  韩震  陈锦辉 《海洋科学》2009,33(4):29-33

基于遥感技术,对反映17 a来博贺澙湖的5景遥感影像定量反演潮滩水边线,在此基础上推算澙湖潮滩的沉积与冲刷速率,同时对引起潮滩变化的动力作用进行探讨,结果表明博贺澙湖的潮滩以淤展为主,其中处于开敞地段的澙湖潮滩出现冲刷,遮蔽岸段的澙湖潮滩淤积,控制澙湖潮滩变化的主要因子是包括圈围潮滩成盐田、虾池以及鱼塘等的人类活动.  相似文献   

Geochemical,mineralogical and textural nature of beach placers,north-east Sri Lanka: Implications for provenance and potential resource     

Samikshya Mohanty  Madurya Adikaram  Debashish Sengupta  Nishara Madhubashini  Chelaka Wijesiri  Somnath Adak  Biswajit Bera 《国际泥沙研究》2023,38(2):279-293

The Pulmoddai placer sands in Sri Lanka(9°3’23.65’’-8°51’38.83’’N and 80°55’22.91’’-81°3’32.65’’E) is considered to be one of the major rare earth element(REE) prospects world-wide. This deposit has a global significance in terms of strategic economic resources and can provide valuable insight for resource estimation and for its economic use. A detailed study of the geochemical, mineralogical, and textural properties of the heavy minerals of this region is undertaken applying the scanning electr...  相似文献   

Differential feeding rates of native and alien predators on the invasive Asian date mussel Arcuatula senhousia (Benson in cantor, 1842) in a Mediterranean coastal lagoon     

Serenella Cabiddu  Pierantonio Addis  Francesco Palmas  Antonio Pusceddu 《Marine Ecology》2023,44(1):e12738

The alien Asian date mussel Arcuatula senhousia inhabits several coastal environments worldwide. This species can form dense mats where individuals attach through byssus threads, thus altering the structure, functioning and biodiversity of the native communities. We investigated the feeding preference of different predators on this alien species in a Mediterranean coastal lagoon. To do this, a mesocosm experiment was conducted using two crab species (the Mediterranean green crab Carcinus aestuarii) and the Say mud crab Dyspanopeus sayi, and one gastropod, the banded dye-murex Hexaplex trunculus as predators of A. senhousia with or without byssus mats. Our data suggest that C. aestuarii is a more effective predator against A. senhousia than D. sayi, and that H. trunculus is almost ineffective. A possible implication of this result is the potential use of the native crab C. aestuarii for limit the formation of the byssus mats, thus mitigating their potential negative effects on the native communities.  相似文献   

海洋科学文献中要规范使用的两组概念     

陈溥远 《海洋科学》2010,34(6):92-93

为了规范使用科学术语,根据全国科学技术名词审定委员会最新审定公布的概念内涵,并参考相关资料,对近年来在海洋科学文献中经常混用的两组概念:"抗菌活性"、"抗菌活力"、"抗菌能力";"潟湖"、"泻湖"进行了纠正,并建议有关人员在今后撰文中,注意使用规范的科学名词——"抗菌活性"和"潟湖";而勿用"抗菌活力"、"抗菌能力"和"泻湖"。  相似文献   

海岸生态环境变化对荣成市月湖旅游资源影响研究   总被引：6，自引：0，他引：6  

王友爱  李平 《海岸工程》2009,28(2):98-104

月湖，当地人称天鹅湖，是国家级荣成大天鹅自然保护区的3个核心区之一。这里滨海景色宜人，鸟类景观独特，具有很高的旅游价值。20世纪80年代以来，在人类活动的影响下，月湖海岸生态环境逐步退化。从1992年到2007年，月湖的COD、NH3-N及废水排放量增加了1倍，SO2、NO2及烟尘的排放量则增加了3倍多，植被面积减少了10％。环境质量的变化导致周围旅游资源质量发生相应的改变。文中从海岸生态环境变化的影响因素入手，采用旅游环境承载力评价方法，计算出1992年以来，月湖旅游承载力指数以平均每年4．2％的速度降低，指出了海岸生态环境变化对旅游资源的不利影响，已引起当地相关部门的注意。  相似文献   

Formation and distribution of coal measure source rocks in the Eocene Pinghu Formation in the Pinghu Slope of the Xihu Depression,East China Sea Shelf Basin     

Yongcai Yang  Xiaojun Xie  Youchuan Li  Gang Guo  Xiaoying Xi  Wenjing Ding 《海洋学报(英文版)》2023,42(3):254-269

The Xihu Depression in the East China Sea Shelf Basin is a large petroliferous sedimentary depression, in which oil and gas reservoirs were mainly discovered in the Pinghu Slope and the central inversion zone. The oil-gas source correlation in the Xihu Depression was analyzed by hydrocarbon generating thermal simulation data via gold-tube pyrolysis experiments. The results indicated that the oil and gas in the Xihu Depression were mainly derived from coal measure source rocks of the Eocene Pinghu Formation. Therefore, the identification of coal seams is extremely crucial for evaluating coal measure source rocks in the Pinghu Formation in the Xihu Depression. Geochemical and petrological characterization pointed to input of terrigenous organic matter and redox conditions of the depositional environment as factors that govern the ability of the coal measure source rocks in hydrocarbon generation in the Xihu Depression. In this regard, the sedimentary organic facies in the Pinghu Formation were classified into four predominantly terrigenous and one mixed-source subfacies, which all varied in carbon and hydrogen content. The coal measure source rocks in the carbon- and hydrogen-rich tidal flat-lagoon exhibited the highest hydrocarbon generation potential, whereas the mudstone in the neritic facies was the poorest in its hydrocarbon yield. These results suggested that the coal measure source rocks in the Pinghu Formation likely developed in the Hangzhou Slope and the Tiantai Slope, both representing promising sources for oil and gas exploration.  相似文献