若尔盖高原生态脆弱地区草地沙化遥感监测研究

Remote Sensing Monitoring of Sand Expansion at Fragile Grassland Ecosystem in Rouergai Plateau, Sichuan, China

若尔盖县是四川省重要的牧业基地，该县草原地区由于过度放牧导致草地退化和沙化。本研究在已有研究的基础上，对80年代至90年代中期的草地沙化进行了遥感监测。研究证实，该地区1994年沙地面积已达7610．4公顷，比1985年扩大了3750．5公顷，草地沙化面积比1985年扩大了两倍。以该地区为代表的若尔盖高原“沼泽—草甸—沙地”十分脆弱的生态系统在进一步恶化。

Rouergai county is one of the most important pasture areas in Sichuan Province. One of the serious problems in resourcesand environment of animal husbandry is grassland degradation and sand dune expansion due to overgrazing. This project iscarried out on the basis of past research and comparison of sand area changes between middle of 1980, s and 1990's by usingremote sensing techniques. The results showed that sand area reached 7550. 0 hectares in 1994,anincrease of 3750. 5 hectarescompared with that in 1985 or 2 times in terms. This further degenerates the fragile swamp - meadows -sand ecosystem.