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中国南方湿润区“荒漠化”问题讨论

DOI: 10.18306/dlkxjz.2015.06.012, PP. 772-780

Keywords: 荒漠化,土地退化,南方湿润区,红层荒漠化,遥感监测

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Abstract:

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。

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