【摘要】 黄河源区位于多年冻土区,严酷寒冷的气候条件和冻土共同构建成一种特殊的冻结水环境,使地下水类型和水文地质结构均发生变化,与非冻土区有显著的差别,形成特殊的水文地质区。近几十年来,由于全球性气候温变暖,出现大面积冻土退化,以及过度放牧、鼠害加剧等原因,造成草场退化,沙漠化趋势日渐明显,严重地冲击着黄河河源区的水源养涵功能,导致黄河在源头段多次出现断流。通过水平衡计算,探讨了气候变暖对黄河源区多年冻土退化的影响,并阐述了冻结层上水环境变化和人类活动对生态环境的影响。更多还原

【Abstract】 The headwater region of the Yellow River lies in permafrost regions with cold climate and frozen earth, which contributes to a special freezing water environment and enables types of groundwater and hydrogeological structures to change. This leads to the formation of particular hydrogeological zones which are different from those of a non-frozen earth. In recent decades, over-grazing and increasing rodent damage have resulted in the degeneration of the permafrost regions. In addition, global warming has caused serious degeneration of grassland and desertification problems. These changes have reduced the water conserving capacity of the headwater region of the Yellow River, leading to the occurrence of zero-flow several times in the headwaters of Yellow River. This paper discusses the impacts of global warming on the degeneration of the permafrost regions in the headwaters of the Yellow River, and explains the impacts of human activity and changes in suprapermafrost water environment on the eco-environment.更多还原