干旱区生态环境知识资源中心(Arid): 黄河源区地下水位下降对生态环境的影响

Arid

	黄河源区地下水位下降对生态环境的影响
其他题名	The Effect of Groundwater Table Lowering on Ecological Environment in the Headwaters for the Yellow River
	彭轩明 1; 吴青柏 2; 田明中 1
来源期刊	冰川冻土
ISSN	1000-0240
出版年	2003
卷号	25 期号:6 页码:667-671
中文摘要	黄河源区1:250 000区域环境地质调查资料与以往资料的对比表明，黄河源区区域地下水位近几十年来呈现明显的下降趋势，主要表现在：地下水露头泉口下移，河谷区民井地下水下降及山前冲洪积扇前缘泄出带下移。多年冻土的退化直接导致了冷生隔水层的下移，从而引起区域地下水位的下降。区域地下水位的下降导致生态水位下降，包气带土壤层的含水量减少，使该区出现植被草场退化、生物多样性减少、沼泽湿地萎缩、鼠害猖獗、荒漠化加剧及黄河断流等生态环境问题。
英文摘要	Owing to climate change and human ac-tivities, regional groundwater table and ecological water table are generally decreasing, resulting in a series of environmental geological problems, such as degradation of swampy meadow and vegetation, and desertification. On the base of field survey, the cause of the groundwater table decreasing is analyzed, and the relationship between the ecologi-cal environmental effect and groundwater table lowering is discussed. It is found that groundwater table has greatly changed. The groundwater out-crop in mountain areas are moving downwards with decreasing runoff. The groundwater table of civil well in river valleys has fallen 0. 52 to 1. 18 m. Meanwhile, lake shrinking causes groundwater ta-ble lowering around the basin and the outcome in alluvial and diluvium deposits also moves down-wards. The groundwater table lowering is caused by permafrost degradation, geological structure ac-tion, lake shrinking and human activities. The survey results show that permafrost is in degrada-tion in the headwaters of the Yellow River, discon-tinuous permafrost degrades into thawed area, the lower boundary of permafrost is rising, and perma-frost table is decreasing. The permafrost degrada-tion results in cryogenic waterproof layer moving downward and groundwater table obviously lower-ing. With groundwater table lowering, a series of ecological environmental problems appear. Swampy meadow and vegetation is in degradation and biological diversity is on the decrease owing to the ecological water table lowering and the depth of seasonal thaw layer increasing. Desertification is enlarging.
中文关键词	黄河源区 ; 地下水位 ; 冻土退化 ; 生态环境
英文关键词	headwaters of the Yellow River groundwater table permafrost degradation ecological environment
语种	中文
国家	中国
收录类别	CSCD
WOS类目	MINERALOGY
WOS研究方向	Mineralogy
CSCD记录号	CSCD:1176630
来源机构	中国科学院西北生态环境资源研究院
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/203837
作者单位	1.中国地质大学(北京), 北京 100083, 中国; 2.中国科学院寒区旱区环境与工程研究所, 冻土工程国家重点实验室, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	彭轩明,吴青柏,田明中. 黄河源区地下水位下降对生态环境的影响[J]. 中国科学院西北生态环境资源研究院,2003,25(6):667-671.
APA	彭轩明,吴青柏,&田明中.(2003).黄河源区地下水位下降对生态环境的影响.冰川冻土,25(6),667-671.
MLA	彭轩明,et al."黄河源区地下水位下降对生态环境的影响".冰川冻土 25.6(2003):667-671.