地理科学进展 ›› 2015, Vol. 34 ›› Issue (6): 772-780.doi: 10.18306/dlkxjz.2015.06.012

• 生态环境 • 上一篇    下一篇

中国南方湿润区“荒漠化”问题讨论

金远亮, 彭华*(), 闫罗彬, 项跃武, 王翔宇   

  1. 中山大学地理科学与规划学院,广州 510275
  • 收稿日期:2014-09-01 修回日期:2015-02-01 出版日期:2015-06-15 发布日期:2015-06-15
  • 通讯作者: 彭华 E-mail:eesph@mail.sysu.edu.cn
  • 作者简介:

    作者简介:金远亮(1989-),云南大理人,男,硕士研究生,研究方向为区域生态与植被遥感,E-mail: 555jinyuan@163.com

  • 基金资助:
    国家自然科学基金项目(41171013);国家科技基础性工作专项重点项目(2013FY111900)

Discussion on desertification of humid region in southern China

Yuanliang JIN, Hua PENG*(), Luobin YAN, Yuewu XIANG, Xiangyu WANG   

  1. School of Geography and Planning, Sun Yat-Sen University, Guangzhou 510275, China
  • Received:2014-09-01 Revised:2015-02-01 Online:2015-06-15 Published:2015-06-15
  • Contact: Hua PENG E-mail:eesph@mail.sysu.edu.cn

摘要:

荒漠化是当今世界所面临的严重的环境与社会经济问题,推进荒漠化研究工作对于保护生态环境,促进区域可持续发展具有重要意义。本文在对荒漠化内涵进行系统回顾的基础上,认为除了人为干扰叠加气候性干旱作用导致的荒漠化之外,南方湿润区因水土流失叠加物理性干旱作用导致的极端土地退化也是一种荒漠化,并从物质基础、气候条件、影响因子、形成营力、核心作用和地表过程方面进行比较,最后以南方红层区特殊的“红层荒漠化”为案例,利用实地调查和TM影像的植被覆盖度指标VFC对1992-2013年红层土地退化进行分析。结果显示,在人为反复干扰和其他自然因素作用下地表植被持续退化、群落干旱趋势明显,表土层流失,岩石风化加剧,以致形成类似“荒漠”景观的现象。红层区的退化过程可类比于喀斯特石漠化、红壤山地丘陵退化,但这类极端土地退化现象可否视为“荒漠化”,有待于进一步的深入研究。

关键词: 荒漠化, 土地退化, 南方湿润区, 红层荒漠化, 遥感监测

Abstract:

Desertification is a serious problem worldwide that has environmental and socioeconomic consequences. Desertification research has important significance for protecting the environment and for regional sustainable development. Based on an examination of the connotation of desertification we suggest that desertification not only are caused by human disturbance superimposing on climatic drought in dryland areas of the north, but also can be a result of extreme land degradation due to soil erosion superimposing on physical drought effect in southern humid areas. This study compared different aspects of the desertification processes in dry and humid areas, including material base, climatic conditions, influencing factors, formation forces, core functions, and land surface processes. Finally, we used red beds area of southern China as an example to analyze red beds land degradation by combining on-the-spot investigation and vegetation cover (VFC) data derived from Landsat TM images in 1992-2013. The results show that under the impact of repeated human interference and natural factors, there is a clear trend of vegetation change, topsoil loss, and rock weathering, which produce desert-like landscape. The degradation process in red beds is similar to the Karst rocky desertification and land degradation of red soil in hilly areas, but whether this type of extreme land degradation that took place in the humid area of southern China is "desertification" needs further studying.

Key words: desertification, land degradation, southern humid area, red beds desertification, remote sensing monitoring