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湖南省沅江市橘园学校生物科技活动小组 《初中生》2003,(11)
资料一:美丽的洞庭湖富饶美丽的洞庭湖,位于长江中游以南,湖南省北部。它容纳四水,吞吐长江。整个湖区农业生产条件十分优越,开发历史悠久,素称“鱼米之乡”,是全国重要的商品粮基地之一。 相似文献
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青山垸湿地恢复与鸟类资源保护研究 总被引：1，自引：0，他引：1
1998年青山垸退田还湖,是洞庭湖中退田还湖的一个典型代表,1999年西洞庭湖省级自然保护区与世界自然基金会合作,在青山垸开展了＂恢复湿地和社区共管＂示范项目,其生态环境和湿地资源都发生了很大的变化,尤其是鸟类资源变化十分明显。2004～2009年,笔者对青山垸的鸟类资源进行了动态监测,记录到并鉴定出鸟类135种,分属于8目35科,本文对青山垸的鸟类资源变化情况进行了总结,并对青山垸鸟类资源保护和湿地资源管理模式进行了探讨。 相似文献
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邓水清 《衡阳师范学院学报》1985,(4)
洞庭湖,曾有多少墨客骚人为之歌咏!社会的演化,人世的变迁,都被历尽沧桑的云梦泽摄下了影象,成为文人取之不尽的素材。古人能写出千古绝唱,今人同样可以有名篇佳作。喝洞庭湖水长大的青年作家刘健安,就是致力于描绘色彩斑斓的洞庭湖,歌颂辛勤劳作的洞庭人的,已经写出了十几个关于“湖”的中、短篇小说。其中短篇小说《洞庭纤夫》获湖南省首届文学奖。特别是中篇小说《白莲湖》(《当代)一九八一年第三期)和《珍珠湖》(《青年文学》一九八三年第六期)发表以后,引起了广泛的注意,后者并获得了全国首届青年文学创作奖。《白莲湖》、《珍珠湖》是两幅在苦难中 相似文献
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洞庭湖湿地是全国最大的淡水湿地。近年来,由于洪灾频仍,损失巨大,湖南省提出了全面治理洞庭湖的“4350工程”,目标是重现八百里洞庭浩浩荡荡的美景,把洞庭湖建设成为长江中游重要的调蓄滞洪主导功能区。但在工程的实施过程中,有关湿地管理的问题并未得到完全解决。分析认为,“退人不退耕”与“移民建镇”都是值得商榷的,只有将湖区的居民迁离洞庭湖,湿地生态系统才能得到根本的恢复。同时,调整当前的行政区划和治理污染也是很有必要的,这对湖区湿地功能的恢复具有重要意义。 相似文献
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周耀 《中学语文教学参考(高中生版(学语文))》1996,(12)
重建《生物圈》一章的知识网络●周耀２．人工围垦：洞庭湖区自东晋开始围垦，到１９４９年，围垸达９９３个，堤总长６４００千米，垸内耕地３９．５万公顷，新中国成立后，围湖规模越来越大，造田速度越来越快。洞庭湖面积缩小率由新中国成立前的每年２０平方千米，上升... 相似文献
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苏来明 《中学语文教学参考(高中生版(学语文))》1999,(11)
洞庭湖位于湖南省北部荆江南岸。南有湘江、资水、沅江、澧水“四水”汇入;北有松滋、太平、藕池、调弦四口与长江相通,湖水最后在岳阳城陵矶注入长江（如下图）。洞庭湖示意图洞庭湖是第三纪末期、地层断裂后经过长期的缓慢下沉及江河冲积物的不断充填而逐渐形成的。古代的洞庭湖是很大的,《山海经》记载“洞庭乃沅澧之交,潇湘之渊。夏秋水涨,方九百里。”三国以前,洞庭湖的整个湖面是连成一片的,夏秋时节,波涛万顷,方圆八百里。至南北朝时期,洞庭湖变成了三个湖：东面的仍叫洞庭湖,南面的叫青草湖（也称南洞庭湖）,西面的叫赤… 相似文献
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洞庭湖位于长江中游南岸,水安全问题突出,主要表现在三个方面:泥沙淤积、洪涝灾害、水污染与环境退化等．文章采取模糊数学方法,对洞庭湖水安全总体状况进行了定量分析和评价,结果表明,水安全形势最好的是东洞庭湖,最坏的是西洞庭湖,南洞庭湖介于二者之间,说明洞庭湖区水安全状况从东向西逐渐恶化．再从泥沙淤积、洪涝灾害、水污染与环境退化等具体水安全问题的表现看,三者也表现出较大的相似性,说明洞庭湖的水安全问题是全湖性的．但不同之处和差异性依然存在． 相似文献
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《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
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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. 相似文献
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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. 相似文献
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RUZBEHANI Mohsen 《重庆大学学报(英文版)》2004,3(1):20-25
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec… 相似文献
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Rajesh Kanoi 《海外英语》2007,(1):52
Today, Sunday morning, I sit thinking and typing at my computer. My thoughts are in my homeland, India and my body is in China. The body is here and mind there for a good reason. Mr. Hu is president and I am resident and both are in each other's countries (what a difference the absence of one small letter makes!). Mr. Hu will return in a few days and I will stay on longer. 相似文献
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正A One day a pig went to the stable(马棚)to see his good friend,an oldhorse,and was going to stay there forthenight.Night came and it was time forsleep.The pig went into the straw heap(稻草堆)and lay comfortably.A longtime passed,but the horse was stillstanding there and did not move.Thepig asked the horse why he did not go tosleep."Standing like this is the begin-ning ofsleeping,"answered the horse. 相似文献
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《今日中学生》2014,(9)
正1.Any fool can count the seeds in an apple.Only God can count all the apples in one seed.2.Happy families are all alike;every unhappy family is unhappy in its own way.3.Memories are the key not to the past,but to the future.4.Sometimes in the dark you see what you want to see.5.There is a great difference between 相似文献
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《重庆大学学报(英文版)》2014,(2)
正Scope and Policy The Journal of Chongqing University-English Edition(JCQU-E)is a peerreviewed journal publishing research articles in multiple disciplines of science and technology,covering civil and environmental engineering,chemical engineering,biotechnology,mechanical and electrical engineering,computer and data processing,mining,metallurgy,materials science,and interdisciplines thereof. 相似文献