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地理学报  2006 

不同土地利用方式对岩溶作用的影响——以广西弄拉峰丛洼地岩溶系统为例

DOI: 10.11821/xb200611007, PP. 1181-1188

Keywords: 土地利用,岩溶作用,溶蚀量,广西弄拉

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Abstract:

土地利用可使土壤理化性质产生一系列的变化,从而影响到岩溶作用的方向和强度。以广西马山县弄拉典型峰丛洼地区为例,通过野外溶蚀试片法探讨了不同土地利用方式对岩溶作用的影响。结果表明不同土地利用类型土下溶蚀量存在显著差异。林地与园地土下溶蚀量极大部分大于20mg/a,明显高于灌丛地及(休)耕地(多小于20mg/a)。总体上,溶蚀量从大到小依次为园地、林地、耕地、休耕地与灌丛。其中至少有两个主要控制因素土壤有机质和土壤CO2林地和园地土下溶蚀作用主要受前者控制,土壤有机质含量越高、pH越低,土下溶蚀量越大。在耕地与灌丛条件下由于土壤有机质含量较低,土下溶蚀量主要受土壤CO2控制。

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