气候变化领域集成服务门户(CCPortal): 中国西北干旱区湖泊沉积物中有机质碳同位素组成的环境意义以民勤盆地三角城古湖泊为例

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	中国西北干旱区湖泊沉积物中有机质碳同位素组成的环境意义以民勤盆地三角城古湖泊为例
其他题名	THE PALEOENVIRONMENTAL SIGNIFICANCE OF ORGANIC CARBON ISOTOPE IN LACUSTRINE SEDIMENTS IN THE ARID CHINA: AN EXAMPLE FROM SANJIAOCHENG PALAEOLAKE IN MINQIN
	张成君; 陈发虎; 尚华明; 曹洁
发表日期	2004
ISSN	1001-7410
卷号	24 期号:1 页码:88-94
中文摘要	通过对中国西北干旱区石羊河流域民勤盆地三角城古湖泊沉积物有机质碳同位素组成(delta^13Corg)分析，表明末次冰期与全新世时气候和植被有明显的差异，末次冰期delta^13Corg总体偏轻(-30～-25)，而全新世碳同位素组成则有较大的变化，在早全新世碳同位素组成有多次短期快速变重(-10左右)的变化，中全新世碳同位素组成总体偏重(-20～-10)，晚全新世碳同位素组成偏轻(-25左右)。分析表明湖泊沉积物有机质碳同位素组成反映了陆生C3，植物和湖泊内源水生植物变化的关系，末次冰期以来西北干旱区C4植物不发育，偏重的有机质碳同位素值与C4植物无关。从沉积物中有机质组分、元素等分析表明，末次冰期时主要以河流相沉积为主，湖泊中有机质主要来源于上游祁连山的陆生C3植物，有机碳含量较低，表明当时的上游的陆生植被不繁盛，区域气候较干冷；从全新世开始，三角城古湖泊开始形成，沉积物中碳同位素组成偏重的有机质主要来源于湖泊中的沉水植物，此时湖泊水体较大，湖泊生产力较高。而沉积物中有机质碳同位素组成偏轻时期的有机质主要来源于挺水植物、陆生C3植物，较低的有机碳含量说明该时期陆生植被不发育，气候较干冷，湖泊水体较小。
英文摘要	The organic carbon isotopic compositions (delta~(13)Corg) of Sanjiaocheng palaeolake in the Shiyang River drainage, Minqin Basin changed obviously from the Holoeene to Last Glacial. delta~(13)Corg was lighter in the Last Glacial ( - 30 %o~ - 25 %o) and it varied a lot in the Holoeene. 8nCott became quickly heavier several times in the Early Holoeene ( - 10 %o) and Middle Holoeene ( - 20 %o~ - 10 %o), and lighter in the Late Holoeene (ca - 25 %>) . The organic components of sediments show that Sanjiaocheng section was a river environment in the Last Glacial, and organic matters with a low content in the sediments came mostly from the terrestrial C3 plants. It's made a conclusion that the vegetation was not overgrowth and the palaeoclimate was cold and dry. But from the Early Holoeene, this area started to form a lake and organic matters in the sediments mainly came from submerged macrophytes, merged macrophytes and terrestrial C_3 plants. The heavier carbon isotopic compositions of organic sediments came mainly from the submerged macrophytes and the lake level was higher during this time, and accompanied by a high lake productivity. The lighter carbon isotopic compositions of or-ganic sediments came mainly from the emergent macrophytes and terrestrial C_3 plants and the level was lower. Because there was a low organic carbon content, it showed that the vegetation was bad and the palaeoclimate was cold and dry.
关键词	三角城有机质碳同位素组成沉水植物陆生植物
英文关键词	Sanjiaocheng;organic carbon isotope;submerged macrophyte;terrestrial plant
语种	中文
WOS研究方向	Oceanography
WOS类目	OCEANOGRAPHY
CSCD记录号	CSCD:1510729
来源期刊	第四纪研究
来源机构	兰州大学 ; 中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/1843
推荐引用方式 GB/T 7714	张成君,陈发虎,尚华明,等. 中国西北干旱区湖泊沉积物中有机质碳同位素组成的环境意义以民勤盆地三角城古湖泊为例[J]. 兰州大学, 中国科学院青藏高原研究所,2004,24(1):88-94.
APA	张成君,陈发虎,尚华明,&曹洁.(2004).中国西北干旱区湖泊沉积物中有机质碳同位素组成的环境意义以民勤盆地三角城古湖泊为例.第四纪研究,24(1),88-94.
MLA	张成君,et al."中国西北干旱区湖泊沉积物中有机质碳同位素组成的环境意义以民勤盆地三角城古湖泊为例".第四纪研究 24.1(2004):88-94.