干旱区生态环境知识资源中心(Arid): 近7 ka以来甘肃民勤青土湖沉积中的介形类及环境演化

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	近7 ka以来甘肃民勤青土湖沉积中的介形类及环境演化
其他题名	THE OSTRACODS ASSEMBLAGES AND ENVIRONMENTAL EVOLUTION OF THE QINGTU LAKE, MINQIN COUNTY, GANSU PROVINCE SINCE 7KA BP
	蔡燕凤 1; 张虎才 1; 王强 2; 常凤琴 1; 陈光杰 1; 王熊飞 1; 李华勇 1; 张自强 1; 段立曾 1
来源期刊	微体古生物学报
ISSN	1000-0674
出版年	2013
卷号	30 期号:3 页码:263-274
中文摘要	提要对河西走廊东段石羊河终端湖泊沉积的甘肃民勤志云村剖面研究,发现介形类7属11种,根据其地层分布特征划分出6个组合。通过分析介形类属种生态特征、组合变化和沉积岩性,结合~(14)C测年数据,对研究剖面所在的青土湖地区6 626 a BP(Cal.a BP)以来的环境变化进行了初步探讨。分析结果表明:6 626-6 137 a BP时期,湖泊水位由浅变深、水体由咸水变为淡水的状况交替出现,环境由暖干向冷湿转变;6 137-5 817 a BP阶段,湖泊水位变浅,处于相对冷干的气候环境控制之下;5 817-2 978 a BP期间,湖泊水位很浅且为淡水,为冷干的气候环境,逐渐恶化不利于介形类生存,系5 ka余中全新世降温事件至晚全新世开始的环境状况;2 978-1 610 a BP,环境继续恶化,水体曾一度退出剖面所在高度,反映的是干旱的恶劣环境;1 610-1 110 a BP,气候干旱程度有所缓解,处于相对暖干的气候控制之下;1 110 a BP以来,湖泊完全干涸,为典型的暖干状态下的风沙堆积环境,彻底结束了研究区湖泊的存在历史。
英文摘要	Totally 11 species of ostracods belonging to 7 genera have been identified from the ZhiYun section which belongs to the terminal lake of the Shiyang River of east Hexi Corridor, Minqin county, Gansu Province and six ostracods assemblages can be distinguished. Based on the ~(14)C dating, ostracods ecological characters and sedimentary lithological characteristics, the present paper discussed the environmental change of the Qingtu lake since 6 620 a BP. The result shows that from 6 626 to 6 137 a BP climate transform from warm-dry into cold-wet, with repeated deepening and freshening water. From 6 137 to 5 817 a BP, the climate was cold and dry with the lake level turning to shallow. During 5 817-2 978 a BP, the lake was very shallow with fresh waters; the climate was cold-dry and turned to unfavorable for ostracods gradually. It shows characteristics of the Holocene cooling event of ca. 5ka. From 2 978 to 1 610 a BP, the environment deteriorated continuously, and water body was once retreated from the height of the profile, which indicated severe dry environment. During 1 610-1 110 a BP, the climate condition was ameliorated but generally characterized by a relatively dry environment. From 1 110 a BP, the lake was totally dried up and turned to the desert with warm-dry environment.
中文关键词	介形类 ; 环境演化 ; 青土湖 ; 民勤 ; 甘肃
英文关键词	7kaBP ostracods 7ka BP environmental evolution Qingtu Lake Minqin County Gansu Province China
语种	中文
国家	中国
收录类别	CSCD
WOS类目	ENVIRONMENTAL SCIENCES
WOS研究方向	Environmental Sciences & Ecology
CSCD记录号	CSCD:4976888
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/230264
作者单位	1.高原湖泊生态与全球变化实验室云南师范大学旅地学院, 云南省高原地理过程与环境变化重点实验室, 昆明, 云南 650500, 中国; 2.中国地质调査局天津地质矿产研究所, 天津 300170, 中国
推荐引用方式 GB/T 7714	蔡燕凤,张虎才,王强,等. 近7 ka以来甘肃民勤青土湖沉积中的介形类及环境演化[J],2013,30(3):263-274.
APA	蔡燕凤.,张虎才.,王强.,常凤琴.,陈光杰.,...&段立曾.(2013).近7 ka以来甘肃民勤青土湖沉积中的介形类及环境演化.微体古生物学报,30(3),263-274.
MLA	蔡燕凤,et al."近7 ka以来甘肃民勤青土湖沉积中的介形类及环境演化".微体古生物学报 30.3(2013):263-274.