石羊河流域综合治理以来民勤绿洲生态变化分析

利用民勤气象站、水务局及林业局的相关资料并结合实地调查,对石羊河流域综合治理以来,民勤绿洲生态进行了分析,结果显示：①沙尘天气明显减少,大气降尘减少显著；②沙丘移动速度平缓,沙漠进退速度减小,绿洲边缘大部分沙丘、沙漠得到有效治理；③地表来水量逐年增多,地下水开采量逐年减少,地下水位下降速度明显减小,重点治理区地下水位有一定的回升；④人工造林和工程压沙面积逐年增长,植被覆盖度、森林覆盖率明显提高。综治以来民勤绿洲生态恶化趋势得到遏制,局部得到改善和恢复,石羊河流域综合治理成效显著。

Ecological Changes of Minqin Oasis Since Comprehensive Management of the Shiyang River Basin

Based on the related data of the Minqin Meteorological Administration, the Water Affairs Bureau, the Forestry Administration and field investigation, the ecology of Minqin oasis were analyzed since the comprehensive treatment of the Shiyang River Basin. The results show that: (1) the dust weather and atmospheric dust-fall decreased obviously; (2) the moving velocity of sand dunes tend to be gentle, advance and retreat speed of the desert decreases, most of the sand dunes and deserts on the edge of the oasis have been effectively controlled; (3) the surface water quantity is increasing annually, the amount of groundwater exploitation and the decline rate of groundwater level decreases obviously, the groundwater level of the key governance area has a certain recovery; (4) the artificial afforestation and the sand pressing area are increasing annually, the vegetation coverage and the forest coverage rate are improved obviously. The ecological deterioration trend of Minqin oasis has been curbed after the comprehensive treatment, and partial region are improved and restored. The comprehensive treatment of Shiyang River Basin achieved remarkable results.