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Study On Countermeasures For Rehabilitation Of Ecological Environment In The Source Area Of Three Rivers

Posted on:2003-11-10Degree:MasterType:Thesis
Country:ChinaCandidate:J Q LiFull Text:PDF
GTID:2121360095450550Subject:Crop Cultivation and Farming System
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Plenteous fresh water is the magnitude guarantee of the subsistence and society abidance development of human being. The primary river of China?The Yangtze River and The Yellow River are traversing from east to west, and flowing 17 provinces and cities and municipalities. The production of industry and agriculture and the life of dumb millions of river basin entirely depend on the two rivers. The Lantsang is an exclusive river that flows through 6 countries in Asia, it also is the main fresh water of 5 countries in southeast Asia.Water is the root of all life on the earth, the source of rivers is the base of the river. The three rivers originate from The Qingzang Altiplano hinterland that is belongs to Yushu and Guoluo municipality of Qinghai province , the three rivers are The Yangtze River, Yellow River and The Lantsang . It is called "Cistern of China" . The Yangtze River , Yellow River and The Lantsang from the aerial Qingzang Altiplano foster 8 hundred million population of drainage area, and gestated illustrious the culture of China, and developed the old history of China and southeast Asia. The geography position of the source of three rivers is pretty especial. Its climate is chilliness and altitude is high. There are a lot of glaciers and jokuls and lakes and creeks and everglade. Biology resource diversity is diffusely distributing. Meanwhile, it can adjust the climate of Asia and the world, and it is the main cradle of water, it is also the rare quick gene warehouse in the world. Therefore, the source of the three rivers has quite particular ecological and stratagem status. Its quality of ecological environment not only influences the development of economy of Qinghai province but also badly restricts the progress of society economy of the middle and lower reaches of rivers and China and the five countries in the southeast Asia.The source of the three rivers situated at The Qingzang Altiplano hinterland. It locates in east longitude 89°40' -102°20', north latitude 3l°40' -36°l5' .average altitude 3700-5000m, its total area is 36.30 myriad sq. km, and it occupied more that 50% area of Qinghai province. The weather of this region is very cold and short of oxygen, but its resource of water and marsh and landform and physiognomy and creature are abundant. Recent years, owing to the air temperature of the earth calefy and the effect of the action of human being, the ecological environment of the source of the three rivers is destroyed that shocking by the sight: snow line is rising, .glaciers are shrinking, lakes and little rivers are drying, swamp is disappearing, vegetation declining, creature genus decreasing, and so on. According to statistic, at the source of the three rivers. 45% lakes dryed, 22% marsh vanished, 32%brooks breaked, the terminal of glaciers annually moved up with 30m-50m velocity; The overcast rate of forest of the drainage area of Yangtze River reduced more that 60%, its water quality is became yellow; more that 2000lakes of the source of The Yellow River seared, the degenerative grassland acreage has reached 423 ten thousand hectare at its initiatory quarter , hungriness grassland proportion is 113 ten thousand hectare, the area of "black land" had approached 200 ten thousand hectare; the region of water and soil flowed in Qinghai has reached 7.5 ten thousand s. q. km, the mud and sand quantity input into Yellow River is 8814 ten thousand ton; from 1988 to 1997, the water quantity of Yellow River in Qinghai lessened 23. 2% than natural years, so taking the Yellow River frequently stop; the distributing area of creature gradually dwindled, the multiformity of creature allayed, the creature kind that getting threaten is about occupy 15-20% in total number of creature , it is higher than 10-15% of the average level of world. For example, in China, the distributing areaof the valuable protect animal-zang-antelope shrinked 4 ten thousand s. q. km from9 ten thousand s. q. km in 70-80 time. Crazy pick and dug of herb and mine led to the wither of vegetation of the...
Keywords/Search Tags:the source of the three rivers, ecological environment, rehabilitation, Qinghai province, Countermeasures
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