地理科学

地理科学 ›› 2012, Vol. 32 ›› Issue (5): 616-620.doi: 10.13249/j.cnki.sgs.2012.05.616

• • 上一篇    下一篇

新疆石河子草滩湖湿地沉积物地球化学特征及其古环境分析

张芸1(), 杨振京2, 孔昭宸1, 阎顺3   

  1. 1. 中国科学院植物研究所植被与环境变化国家重点实验室, 北京 100093
    2. 中国地质科学院水文地质环境地质研究所, 河北 正定 050803
    3. 中国科学院新疆生态与地理研究所, 新疆 乌鲁木齐 830011
  • 收稿日期:2011-07-20 修回日期:2011-09-01 出版日期:2012-05-20 发布日期:2012-05-20
  • 作者简介:

    作者简介：张 芸(1974-),女,安徽黄山人,副研究员,主要研究方向为第四纪孢粉和全球变化研究。E-mail: zhangygl@ibcas.ac.cn

  • 基金资助:
    国家自然科学基金项目(批准号: 40972212,40872116和40601104)、中国科学院植物研究所植被与环境变化国家重点实验室2011年青年人才项目以及教育部留学回国人员科研启动基金资助

Geochemical Characteristics and Its Paleoenvironment of Wetland Sediment in Caotanhu Wetland, Shihezi City in Xinjiang Province of China

Yun ZHANG1(), Zhen-jing YANG2, Zhao-chen KONG1, Shun YAN3   

  1. 1. State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China
    2. Institute of Hydrologic and Environmental Geology, Chinese Academy of Geological Sciences, Zhengding, Hebei 050803, China
    3. Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, Xinjiang 830011, China
  • Received:2011-07-20 Revised:2011-09-01 Online:2012-05-20 Published:2012-05-20

RichHTML

PDF (PC)

赞

被引次数

25

摘要：

以新疆石河子草滩湖湿地作为研究地点,采用化学分析手段,获取该地区4 000 a B.P.以来有机质和总氮TN等数据,并结合孢粉数据,综合探讨古气候变化特征。在500~1 080 a B.P.和2 190~3 800 a B.P.期间,有机质和TN含量较高,此时气候较为湿润,泥炭累积;而在1 080~2 190 a B.P.期间,有机质和TN含量均处于剖面最低值,可能出现一次干旱事件,不利于泥炭堆积。湿地开垦为农田,其有机质和TN含量变化迅速减少,养分大量损失,可见开垦活动是引起湿地退化的原因之一。

关键词: 湿地, 沉积物, 有机质, 全氮, 草炭层

Abstract:

Soil organic matter, total organic carbon (TOC) and total nitrogen (TN) are the important indexes to research the change of dry-moist palaeoclimate change and analyze the reason of the wetland degeneration. The Caotanhu wetland in Shihezi, which is located at the transitional zone between the middle section of Tianshan Mountains and the Junggar Basin in Xinjiang, is selected as the research area. Using the chemical analysis methods, the high resolution record of soil organic matter, TOC and TN data since 4 000 a B.P. was obtained. Combined with pollen data, the information of paleoclimate change was extracted. The results revealed during 500-1080 a B.P. and 2190-3800 a B.P., soil organic matter and TN were at their higher values, suggesting that the climate became humid and the wetland developed with abundant freshwater aquatic plants, which contributed to the peat accumulation. But during 1080-2190 a B.P., the lowest values of soil organic matter and TN indicated that a dry climatic condition was not favorable for the accumulation of peat. Once the wetland has been converted into farmland, the great loss in soil organic matter and TN happened, which indicates that human reclamation is one of reasons of the degradation of wetlands.

Key words: wetland, sediment, soil organic matter, total nitrogen, peat

中图分类号: 

  • P534.63