共查询到20条相似文献，搜索用时 62 毫秒
1.
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. 相似文献
2.
海洋酸化对近岸海洋生物的影响 总被引：3，自引：0，他引：3
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。 相似文献
3.
深圳近岸海域水环境质量时空变化 总被引：1，自引：0，他引：1
厉红梅 《中山大学学报论丛》2006,26(9):190-192
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。 相似文献
4.
吴国文 《海南师范学院学报》2005,18(1):66-70
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． 相似文献
5.
6.
经济发展对泉州市沿岸生态环境的影响及治理对策 总被引：8，自引：0，他引：8
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。 相似文献
7.
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。 相似文献
8.
李海龙 《鞍山师范学院学报》2003,5(2):1-3
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． 相似文献
9.
10.
11.
罗艳萍 《读与写:教育教学刊》2008,5(6)
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. 相似文献
12.
Richard Denner 《海外英语》2007,(4):14-15
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. 相似文献
13.
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. 相似文献
14.
邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
15.
16.
陈美曦 《山东教育学院学报》2008,23(2):103-107
Different nations have different social cultures, and the social culture of every nation is developing with the development of the nation, language is greatly influenced by social culture, which enables language to possess national and historical characteristics. Word is the smallest, independent, meaningful linguistic unit of language. It can well reflect the national and historical characteristics. From synchronic aspect, the social and cultural influence on word meaning is mainly embodied in conceptual and associative meanings of word. The incorrespondence of word meaning is a phenomenon that exists in both conceptual and associative meanings of word among different languages. From diachronic aspect, the development of social culture causes some changes of word meaning to some extent. Therefore, social culture plays a key role in vocabulary learning and mastery of a language. 相似文献
17.
Rachel Zupek 《海外英语》2007,(11):40-41
我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了 相似文献
18.
《海外英语》2007,(4):36
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. 相似文献
19.
YANGShiguo 《重庆大学学报(英文版)》2004,3(1):86-88
The problem on the geometrc inequalities involving an n-dimensional simplex and its inscribed simplex is studied. Aninequality is established, which reveals that the difference between the squared circumradius of the n-dimensional simplex andthe squared distance between its circumcenter and barycenter times the squared circumradius of its inscribed simplex is not lessthan the 2(n-1)th power of n times its squared inradius, and is equal to when the simplex is regular and its inscribed siplex is atangent point one. Deduction from this inequality reaches a generalization of n-dimensional Euler inequality indicating that thecircumradius of the simplex is not less than the n-fold inradius. Another inequality is derived to present the relationship betweenthe circumradius of the n-dimensional simplex and the circumradius and inradius of its pedal simplex. 相似文献