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《Acta Pratacultural Science》 2005-02
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Assumed plan on grassland ecological reconstruction in the source region of Yangtse River,Yellow River and Lantsang River

REN Ji-zhou,LIN Hui-long(College of Pastoral Agriculture Science and Technology,Lanzhou University;Gansu Grassland Ecological Research Institute, Lanzhou 730020, China)  
The source region of Yangtse River,Yellow River and Lantsang River is main part of Tibet plateau, covering only 0.24% of the global terrestrial sphere, but its soil carbon pool accounts for 1.06%-1.20% of the global soil carbon pool with great ecological values. The canopy of plant decreased 2.252%; soil organic carbon reservoir fell down 11.454% from 1986 to 2000 in this region, while the annual carbon dioxide emission dropped only 9.165% in the same period. It indicates the tendency that soil is transforming the carbon pool into carbon emission source and the reduced grassland is the key factor for this tendency. Particularly, the loss of the high-cold steppe and meadow by over-grazing is the leading cause for the loss of the soil organic carbon. There were 559.03 km~2 diminished for that reason, resulted in the loss of 750.07 millions ton of the soil organic carbon that equals 39.03% of the total loss of the soil organic carbon in the period (1986-2000). So it is of great importance to strengthen the ecological settings of the alpine meadow and alpine steppe in the area in order to safeguard the national as well as global ecological situation. Authors proposed a special grassland agricultural coupling ecosystem in this region by dividing the region into four function areas: the core area of the natural reserve, transitional area of the natural reserve (for hunting and collecting), ecological-production area of natural reserve and ordinary residence area. The theory of four production levels in grassland agro-ecosystem is applied correspondingly into the four function areas based on the natural reserve in order to form a coupling system with two levels: the internal coupling system among the four function areas in the region and the external coupling system between the region and its surrounding areas. In doing so, the economic, ecological and social potentials would be developed effectively through rational exchange of ecological functional services at the headstream areas with materials and energy flows in the benefited lower reaches.
【CateGory Index】: S812
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