茂名近海环境保护问题及对策研究

随着茂名港口经济的发展,向海洋要资源、要效益、建设海洋经济强市以及发展海洋经济与海洋环境保护的矛盾日益尖锐,特别是茂名近岸海域环境污染问题日趋突出.面对茂名近海岸环境污染现状,从五个方面提出了控制陆源污染是防治茂名近岸海域环境污染的有效措施.     

海洋酸化对近岸海洋生物的影响

海洋酸化是继"温室效应"之后又一由CO2过量排放而引起的全球性环境问题。一方面,海洋酸化作为一种环境胁迫因子,可以破坏海洋生物体内的酸碱平衡,进而改变海洋生物组织细胞渗透压,导致海洋生物组织细胞损伤甚至死亡;另一方面,海洋酸化引起的海水pH值降低及海水碳酸盐饱和度改变可破坏海洋生态系统中CO2—碳酸盐体系的动态平衡,这将造成那些具有碳酸盐外壳(或骨骼)的海洋生物其碳酸盐外壳(或骨骼)的溶蚀或导致这些海洋生物的幼体无法正常形成所需的碳酸盐外壳(或骨骼),同时,也会不同程度的影响一些海洋生物的生物矿化作用,从而影响具有碳酸盐外壳(或骨骼)以及生物矿化作用的海洋生物的正常生长、发育和繁殖。近岸海域处于大气圈、岩石圈、生物圈的耦合地带,具有生态环境复杂、渔业资源丰富的特点,是人类进行渔业生产和经济海产人工增养殖的重要场所和基地。相对其它海洋区域而言,近岸海域水层较浅,CO2气体在水中的溶解一般处于饱和状态,水体中的CO2分压易随空气中CO2浓度的变化而变化,是最先也是最容易受到海洋酸化影响的海域。本文从海洋酸化对近岸海洋生物的环境胁迫效应以及海洋酸化对近岸海洋生物矿化作用的影响两方面,综述了海洋酸化对近岸海洋生物产生的影响。     

深圳近岸海域水环境质量时空变化

对深圳市近岸海域水质时空变化进行了分析,结果表明深圳东、西部海域水质污染存在明显差异:1985-2005年东部海域水质一直保持良好,较少受到污染物的影响;西部海域水质总体上逐渐变差,近年来海域水质污染严重,受到较严重的PO43-和IN等生活型污染影响。最后,提出了深圳市近岸海域污染防治对策。     

三亚六道湾海洋生态现状调查与初步研究

通过对2001年12月海南三亚六道湾近岸海域水生生物群落定性定量调查，初步比较分析了水生生物群落与水富营养化状态指数的相互关系，并借以对该区域水环境质量进行评价．结果表明：受该区域海水营养盐浓度较低影响，海水水质及底质质量优良；与海南其他地区比较，海洋生物生物量和栖息密度较低；底栖动物存在明显的群落结构特征．     

热点八 胶莱人工海河

莱州湾、胶州湾分别处于渤海、黄海,是两个半封闭的内湾,由于两湾水体交换能力弱和长期受陆源排污影响,近二十年来海洋生态环境不断恶化,成为山东近岸海域污染的“重灾区”,也是山东建设生态省的两大顽疾。     

经济发展对泉州市沿岸生态环境的影响及治理对策

从2000年11月至2001年12月期间，对泉州沿岸海域水质进行了三期的采样分析，并结合该地区1996－2000年五年的监测数据，针对沿岸海域及滩涂生态环境的现状，综合分析了经济发展对环境生态系统所造成的影响，就如何实现资源及城市可持续发展，污染的治理和产业结构的调整提出了一些具体的设想。     

我国第一批国家级海洋自然保护区

海洋自然保护区是指为保护海洋自然资源和环境，在海域、海岛、海岸带以及河口区划出一定范围，加以保护的区域。     

海水入浸对近岸海域海水水质和生态系统的潜在影响

传统现点认为，海水入浸只可能对海岸区域含水层的水质产生负面影响，而不可能对近岸海域中海水本身的水质产生明显影响．本在分析和介绍当今国际上对滨海地区地下水动态研究的最新进展的基础上，探讨了海水入浸对近岸海域海水水质和生态系统的潜在影响．近年频发于我国东南沿海的给海洋渔业带来致命打击的赤潮，是近岸海域受到严重污染的突出表现，而本的分析认为海水入浸是赤潮的潜在诱因．     

全球海洋环境污染敲响警钟

三年前,在由美国科学家绘制的“人类对海洋影响的全球地图”中,除却南极、北极附近少量水域,已经几乎没有哪处海洋谈得上“清洁”。而中国渤海、东海、南海,亦是近岸海洋污染区域中“浓墨重彩”的一笔。康菲漏油事故以来,渤海海域又增加了840千米。劣四等海水。     

热点素材4 海藻入侵青岛

山东青岛海域的海藻来源于青岛外海,6月中旬逐渐漂移至青岛近岸海域,并呈加重趋势。6月下旬,受南方强降雨及气候变化的影响,青岛近海海域的海藻曾蔓延至24000平方公里(约相当于24个香港的总面     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?     

Western and Eastern culture differences in commercial field

The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity.     

只要努力,不要后悔

There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love.     

浅谈移民问题

Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject.     

风的曲线

Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose.     

团图为数的图中的闭团贯数

Given a graph G,a subgraph C is called a clique of G if C is a complete subgraph of G maximal under inclusion and |C|≥2. A clique-transversal set S of G is a set of vertices of G such that S meets all cliques of G. The clique-transversal number, denoted as TC (G), is the minimum cardinality of a clique-transversal set in G. The clique-graph of G, denoted as K (G), is the graph obtained by taking the cliques of G as vertices, and two vertices are adjacent if and only if the corresponding cliques in G have nonempty intersection. Let F be a class of graphs G such that F={G|K(G) is a tree}. In this paper the graphs in F having independent clique-transversal sets are shown and thus TC (G)/|G|≤1/2 for all G ∈ F.     

Sister Carrie, an Adherent of Desires

Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities.