贵州省喀斯特地区土地石漠化的内动力作用机制

Intrinsic Driving Mechanism of Land Rocky Desertification in Karst Regions of Guizhou Province

特定的生态地质环境背景对土地石漠化具有明显的控制作用。贵州省土地石漠化集中分布在喀斯特极度发育和构造活动强烈的河流上游及河谷地带。温暖潮湿的季风气候为喀斯特地貌的强烈发育提供了必要的溶蚀条件 ;构造运动塑造了陡峻而破碎的喀斯特地貌景观 ,以及由此而产生的较大地表切割度和地形坡度 ,为石漠化提供了动力潜能 ;古环境演化为石漠化提供了丰富的碳酸盐物质 ,自晚震旦纪到三叠纪晚期 ,贵州省发育了 4套碳酸盐岩沉积建造 。

The given eco geoenvironmental setting has evident control action on land rocky desertification, rocky deserted land mostly distributes in the river-valley regions where karst very developed and tectogenesis was violent in Guizhou province. Warm and humid monsoon climate provides corrosion condition for rocky desertification; Tectogenesis sculptured steep and fragmentized karst land feature with sharp topographic relief, which offer rocky desertification a latent energy; Paleoenvironment supplied rich carbonate for rocky desertification, four carbonate sedimentary formations had developed from late Sinian to late Trias in Guizhou province, pure carbonate rock constitute the substantial foundation of land rocky desertification.