与非洲草原动物亲密接触

笔者先后18次深入肯尼亚、坦桑尼亚、赞比亚、津巴布韦、博茨瓦纳、纳米比亚、南非等国的18个野生动物保护区,研究狮子、花豹和猎豹等大型猫科动物的生活习性及其面临的生存威胁。与非洲草原     

阿里地区雷电灾害原因分析及对策

本文以阿里地区两起雷击灾害为例,分析阿里地区的雷击灾害特点、成因以及如何进行防御。     

西藏开展雷电试验研究的重要性

文章根据我区防雷现状及面临的技术问题,阐述在西藏开展雷电试验研究的重要性和迫切性,强调试验研究的目的和意义。     

济宁市洸府河大桥综合防雷设计

文章通过介绍济宁市!府河大桥综合防雷系统的设计方案,较全面地阐述了对大型跨河流、跨铁路桥梁的直击雷和雷电感应防护的设计技术,提供了一个行之有效的桥梁综合防雷设计方案。     

日照市雷电灾害易损性分析与区划

利用1965-2009年日照市三个气象观测台站年平均雷暴日和2005～2009年雷电灾害损失资料,结合日照市地理、土壤、人文和气候等特征,提出了雷击密度、雷电灾害频数、经济损失模数、生命易损模数作为日照市雷电灾害易损性评估指标,并进行了综合评估,在此基础上形成了日照市雷灾易损性区划。结果表明:雷电灾害易损性风险不仅取决于当地的自然条件,还受地方经济发展条件的影响,也取决于当地采取雷电防护措施的状况和防雷技术水平,日照市市区属雷电灾害高易损区,五莲县属雷电灾害较高易损区,莒县属雷电灾害中易损区。     

最新科教新闻

长江鱼类资源拉响警报长江上游水系在长江鱼类资源研究中地位特殊。据统计,长江流域共有纯淡水鱼类294种,其中上游江段有260多种;长江特有鱼类共有142种,其中有112种仅分布在上游地区。保护区的建立对改善长江上游水系的鱼类生存状况意义重大。但是,挖沙、滥捕、污水排放等问题屡禁不止,依然对该地区的鱼类资源保护工作形成了严峻挑战     

生态旅游

景点简介： 大江、大湖、大山浑然一体,庐山雄奇险秀,刚柔并济,形成了江西罕见的壮丽景观。“春如梦、夏如滴、秋如醉、冬如玉”,更构成一幅充满魅力的立体天然山水画。历史造就此山,文化孕育此山,名人喜爱此山,世人赞美此山。源远流长的历史和数千年博大精深的文化蕴育了庐山无比丰厚的内涵,使她不仅风光秀丽,更集教育名山、文化名山、宗教名山、政治名山于一身。庐山生物资源丰富。森林覆盖率达76．6％。高等植物近3000种,昆虫2000余种,鸟类170余种,兽类37种。山麓鄱阳湖候鸟保护区,是“鹤的王国”,有世界最大的白鹤群,被誉为中国的“第二座万里长城”。     

电子信息系统雷电防护浅析

介绍了雷电危害的方式,具体探讨了电子信息系统雷电防护措施,说明了信息系统综合防雷保护体系建设的重要性。     

官山内涵及与八百里武当之关系

通过实地考据,官山是一个文化历史概念,是明代成化皇帝在武当山划定的核心保护区。武当山与官山包含依存关系。     

Silicon＇s organic pool and biological cycle in moso bamboo community of Wuyishan Biosphere Reserve

Biomineralization of Si by plants into phytolith formation and precipitation of Si into clays during weathering are two important processes of silicon’s biogeochemical cycle. As a silicon-accumulating plant, the widely distributed and woody Phyllostachys heterocycla var. pubescens (moso bamboo) contributes to storing silicon by biomineralization and, thus, prevents eutrophication of nearby waterbodies through silicon’s erosion of soil particles. A study on the organic pool and biological cycle of silicon (Si) of the moso bamboo community was conducted in Wuyishan Biosphere Reserve, China. The results showed that: (1) the standing crop of the moso bamboo community was 13355.4 g/m², of which 53.61%, 45.82% and 0.56% are represented by the aboveground and belowground parts of moso bamboos, and the understory plants, respectively; (2) the annual net primary production of the community was 2887.1 g/(m²·a), among which the aboveground part, belowground part, litterfalls, and other fractions, accounted for 55.86%, 35.30%, 4.50% and 4.34%, respectively; (3) silicon concentration in stem, branch, leaf, base of stem, root, whip of bamboos, and other plants was 0.15%, 0.79%, 3.10%, 4.40%, 7.32%, 1.52% and 1.01%, respectively; (4) the total Si accumulated in the standing crop of moso bamboo community was 448.91 g/m², with 99.83% of Si of the total community stored in moso bamboo populations; (5) within moso bamboo community, the annual uptake, retention, and return of Si were 95.75, 68.43, 27.32 g/(m²·a), respectively; (6) the turnover time of Si, which is the time an average atom of Si remains in the soil before it is recycled into the trees or shrubs, was 16.4 years; (7) the enrichment ratio of Si in the moso bamboo community, which is the ratio of the mean concentration of nutrients in the net primary production to the mean concentration of nutrients in the biomass of a community, was 0.64; and lastly, (8) moso bamboo plants stored about 1.26×10¹⁰ kg of silicon in the organic pool made up by the moso bamboo forests in the subtropical area of China. Project (No. 30370275) supported by the National Natural Science Foundation of China