黑河流域生态环境气象卫星遥感监测研究

根据甘肃降水资料和农业气象资料得出1989年和1998年为相似年景，利用1989年和1998年NOAA气象卫星AVHRR晴空资料，判识出黑河流域植被，积雪和水体，并根据相应的计算方法得出植被指数，积雪面积和水体面积，对10年来黑河上游地区的植被和积雪，中游地区绿洲植被和下游地区植被和湖泊变化进行分析。结果表明，10年来黑河上游和下游地区植被在退化，中游地区绿洲面积增加，植被指数增高；1989年与1998年黑河上游山区积雪面积变化特征一致，但1998积雪融化明显快于1989年；下游湖泊面积1998年较1989年严重退缩。

A Study of Ecological Environment in Heihe Valley Area through Meteorology Satellite Monitoring

The precipitation and agricultural meteorological data for 1989 and 1998 are similar. The vegetation, snow andwater in Heihe valley were identified using data from NOAA meteorology satellites in 1989 and 1998. Vegetation index, snow andwater areas were calculated on the basis of corresponding analysis. The changes of vegetation index and snow of upper reaches, oasis area of middle reaches and water areas of lower reaches of Heihe valley were also analyzed. The results show that the vegetation of upper and lower reaches of the river are degenerating, the oasis area and vegetation index of middle reaches of the river are increase. The results also show that the changing features of snow area of upper reaches of Heihe valley in 1998 is similar to in 1989, the velocity of snow melting in 1998 is faster than in 1989 and the area of the lake is diminishing severely.