海草床生态系统具有重要的生态服务功能,分析其受威胁状况及影响因素,有利于针对性地提出海草床生态系统的保护策略。文章聚焦于海南岛海草床生态系统,结合调查数据、历史资料和文献,采用国际自然保护联盟(international union for cons...海草床生态系统具有重要的生态服务功能,分析其受威胁状况及影响因素,有利于针对性地提出海草床生态系统的保护策略。文章聚焦于海南岛海草床生态系统,结合调查数据、历史资料和文献,采用国际自然保护联盟(international union for conservation of nature,IUCN)生态系统红色名录评估方法对海南岛地区海草床生态系统进行受威胁状况评估,确定其濒危程度,并探讨了人类活动和自然因素对其影响,提出相应的保护对策。研究结果显示,文昌和三亚地区海草床生态系统面临极危的严峻形势,陵水地区海草床生态系统受威胁等级为濒危,琼海地区海草床生态系统目前处于易危状态,而澄迈地区和儋州地区海草床生态系统分别处于近危和无危状态。海南岛海草床生态系统面临着多重压力,其中围填海及渔业捕捞活动是导致其受损的主导因素,其次为污水排放和水产养殖带来的环境压力,而热带气旋等气候变化因素亦对其造成一定影响。鉴于此,本研究提出了加强规范渔业活动方式、海草无性繁殖研究、长期监测海草健康状况和开展生态连通性研究等建议,旨在促进海南岛海草床生态系统的可持续发展。展开更多
Based on 4'-(1H-tetrazol-5-yl)-[1,1'-biphenyl]-2,4,6-tricarboxylic acid(H_(4)bta)ligand,zinc metal-organic framework(Zn-MOF):{[Zn_(2)(bta)(bpy)_(2)(H_(2)O)]·1.5H_(2)O}_(n)(bpy=2,2'-bipyridine)was desi...Based on 4'-(1H-tetrazol-5-yl)-[1,1'-biphenyl]-2,4,6-tricarboxylic acid(H_(4)bta)ligand,zinc metal-organic framework(Zn-MOF):{[Zn_(2)(bta)(bpy)_(2)(H_(2)O)]·1.5H_(2)O}_(n)(bpy=2,2'-bipyridine)was designed and synthesized by hydrothermal method.Its structure was characterized by elemental analysis,IR spectra,X-ray single crystal diffraction,etc.The asymmetric unit of Zn-MOF contains two crystallographically independent Zn^(2+)ions.Through the connection of Zn^(2+)ions via H_(4)bta,a 1D double-layer network structure is formed.Adjacent double-layer networks further form a 2D supramolecular network through hydrogen bonding.Notably,Zn-MOF exhibited excellent fluorescence properties and could efficiently and sensitively detect various water pollutants:4-nitrophenol(4-NP),Cu^(2+),and pyrimethanil(Pth).Additionally,the mechanism of fluorescence sensing was investigated.CCDC:2432230.展开更多
文摘海草床生态系统具有重要的生态服务功能,分析其受威胁状况及影响因素,有利于针对性地提出海草床生态系统的保护策略。文章聚焦于海南岛海草床生态系统,结合调查数据、历史资料和文献,采用国际自然保护联盟(international union for conservation of nature,IUCN)生态系统红色名录评估方法对海南岛地区海草床生态系统进行受威胁状况评估,确定其濒危程度,并探讨了人类活动和自然因素对其影响,提出相应的保护对策。研究结果显示,文昌和三亚地区海草床生态系统面临极危的严峻形势,陵水地区海草床生态系统受威胁等级为濒危,琼海地区海草床生态系统目前处于易危状态,而澄迈地区和儋州地区海草床生态系统分别处于近危和无危状态。海南岛海草床生态系统面临着多重压力,其中围填海及渔业捕捞活动是导致其受损的主导因素,其次为污水排放和水产养殖带来的环境压力,而热带气旋等气候变化因素亦对其造成一定影响。鉴于此,本研究提出了加强规范渔业活动方式、海草无性繁殖研究、长期监测海草健康状况和开展生态连通性研究等建议,旨在促进海南岛海草床生态系统的可持续发展。
文摘Based on 4'-(1H-tetrazol-5-yl)-[1,1'-biphenyl]-2,4,6-tricarboxylic acid(H_(4)bta)ligand,zinc metal-organic framework(Zn-MOF):{[Zn_(2)(bta)(bpy)_(2)(H_(2)O)]·1.5H_(2)O}_(n)(bpy=2,2'-bipyridine)was designed and synthesized by hydrothermal method.Its structure was characterized by elemental analysis,IR spectra,X-ray single crystal diffraction,etc.The asymmetric unit of Zn-MOF contains two crystallographically independent Zn^(2+)ions.Through the connection of Zn^(2+)ions via H_(4)bta,a 1D double-layer network structure is formed.Adjacent double-layer networks further form a 2D supramolecular network through hydrogen bonding.Notably,Zn-MOF exhibited excellent fluorescence properties and could efficiently and sensitively detect various water pollutants:4-nitrophenol(4-NP),Cu^(2+),and pyrimethanil(Pth).Additionally,the mechanism of fluorescence sensing was investigated.CCDC:2432230.
