古地理学报 ›› 2013, Vol. 15 ›› Issue (1): 135-142. doi: 10.7605/gdlxb.2013.01.013

• 古今地理环境及人类文明 • 上一篇    

从古地理学角度探讨广西石漠化分布特征*

李 飞1 伊文超1,2 阎维巍1   

  1. 1 中国地质科学院岩溶地质研究所,广西桂林 541004; 2 广西师范大学研究生学院,广西桂林 541004
  • 收稿日期:2012-08-21 修回日期:2012-10-20 出版日期:2013-02-01 发布日期:2013-02-01
  • 作者简介:李飞,男,1986年生,助理研究员,从事碳酸盐沉积学和环境地质学研究。E-mail:feinan.karst@gmail.com。
  • 基金资助:
    中国地质调查局地质调查项目(编号:1212011220958)、岩溶所所控项目(编号:2011006)和岩溶生态系统与石漠化治理重点实验室开放课题(编号:2002371110006)联合资助

Distribution of Guangxi karst rocky desertificationby palaeogeographic approach

Li Fei1 Yi Wenchao1,2 Yan Weiwei1   

  1. 1 Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin 541004, Guangxi; 2 Graduate School, Guangxi Normal University, Guilin 541004, Guangxi
  • Received:2012-08-21 Revised:2012-10-20 Online:2013-02-01 Published:2013-02-01
  • About author:Li Fei,born in 1986,is a research assistant in Institute of Karst Geology.Now he is engaged in carbonate sedimentology and environmental geology.E-mail: feinan.karst@gmail.com.

摘要: 岩溶石漠化是指碳酸盐岩发育地区,由于人类不合理活动造成的土壤严重侵蚀,基岩大面积出露,地表出现类似荒漠景观的现象。石漠化的产生取决于基底岩石结构特点和酸不溶物含量。目前对于究竟哪种类型的岩石易于形成石漠化,利于形成石漠化的岩性在空间分布上有无规律性等问题,单纯利用传统的遥感解译方法显得力不从心。作者从古地理学角度对广西石漠化的形成及分布情况进行了研究,将广西石漠化区域划分为7个分区,包括桂林—贺州分区(Ⅰ)、柳州—来宾分区(Ⅱ)、都安—马山分区(Ⅲ)、平果台地分区(Ⅳ)、靖西台地分区(Ⅴ)、扬子台地南缘分区(Ⅵ)和西林—乐业—凌云分区(Ⅶ)。从广西石漠化分布情况可以看出,具有较为稳定台地相格局的地区容易发育连续性的碳酸盐岩(并诱发石漠化),同时重度石漠化一般分布于长时期发育台地边缘礁(滩)相的环境中(例如平果台地相区、靖西台地相区、扬子台地南缘分区)。广西众多的、较为稳定的孤立碳酸盐岩台地建造为石漠化产生提供了“机会”。通过研究容易诱发石漠化岩性的空间分布特征,结合遥感解译和实地调查,对石漠化风险进行评估,对属于不同时代和不同沉积环境下形成的石漠化采用不同的治理模式,这无疑为石漠化研究提供了一个新的角度。

关键词: 广西, 石漠化, 沉积相, 碳酸盐岩台地, 古地理

Abstract: Karst rocky desertification is a desertlike landscape generated in the carbonate rock area, which resulted from serious soil erosion as well as extensive exposure of bedrocks caused by rational human activities.The production of rocky desertification depends on both features of basement carbonate rock and its content of acid-insoluble residues.On the contrary,it seems difficult to identify the regularity in lithology and rocky desertification using traditional remote sensing.The origin of karst rocky desertification and partitioned rocky desertification of Guangxi into seven regions in light of distinct palaeogeographic bankground,including Guilin-Hezhou(Ⅰ),Liuzhou-Laibin(Ⅱ),Du′an-Mashan(Ⅲ),Pingguo Platform(Ⅳ),Jingxi Platform(Ⅴ),southern margin of Yangtze platform(Ⅵ) and Xilin-Leye-Lingyun(Ⅶ).Karst rocky desertification is mainly formed in areas containing relatively stable platform-facies-environments.Moreover,intense rocky desertification largely corresponds to carbonate platform margin reef(or shoal)facies(such as Pingguo Platform,Jingxi Platform,southern margin of Yangtze Platform,etc.).Numerous and stable isolated carbonate platforms can provide such an opportunity to form karst rocky desertification.This work,combined with remote sensing interpretation and field investigation,can provide a new method for risk assessment and management according to local lithology which easily caused rocky desertification.

Key words: Guangxi, karst rocky desertification, sedimentary facies, carbonate rock platform, palaeogeography

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