【摘要】 通过典型样地调查,取样分析,对石漠化过程中土壤的物理性质和化学性质进行了研究。结果表明,随着石漠化的发展,土壤黏性增强,容重增加,孔隙度降低,坚实度加大,保蓄水肥能力和通透性降低,结构恶化;同时,侵蚀和淋溶程度加强,生物富集作用不断减弱,土壤有机质含量大大减少,引起了土壤中全氮、腐殖质、阳离子交换量等主要化学成分的降低,使土壤肥力下降,生产力逐渐丧失。土壤理化性质的变坏与石漠化过程形成相互促进的正反馈关系,并在退化方向和阶段上具有一致性和同步性。更多还原

【Abstract】 Changes of soil physical and chemical properties in rocky desertification process had been studied by samples investigation and analysis.In this process,with developing of rocky desertification,soil stickiness, dry bulk weight and soil compaction increased,but soil porosity,soil aeration,capacity of water and fertility holding decreased.Meanwhile soil fertility and productivity reduced gradually while degree of soil erosion and leaching strengthened,bioenrichment capacity weakened and organic matter decreased obviously,which result in soil total N,humus and cation exchange etc.main chemical components reduced.During the process,the properties of soil physical and chemical and the rocky desertification formed a relation of positive feedback,with the homogeneous in the degraded direction and stage.更多还原