摘要
岩溶区因为存在化学溶蚀,导致地表流失和地下漏失两种现象发生。运用137Cs与土壤营养元素研究岩溶区土壤的地表和地下漏失,得出以下结论:岩溶槽谷区山坡荒地表现出土壤向下汇集,而在菜地因为存在土壤漏失,打破了土壤向下汇集规律。岩溶区的地下漏失并非到处可见,往往发生在岩石裸露率高、人为干扰性强的地区。山坡荒地的全氮、全磷和有机质随着坡位的降低向下汇集,而在人为耕作的菜地,因为存在土壤漏失,土壤的营养元素不再遵循向下汇集的规律,而表现出土壤营养元素随着土壤的下渗向剖面深处迁移,但土壤营养元素在剖面上仍遵循土壤的表聚特性1。37Cs与土壤营养元素存在显著相关关系,说明137Cs和土壤有机质具有相同的物理运动规律。
There exists surface soil erosion and underground soil loss existence because of chemical corrosion in the karst area.The soil surface erosion and underground soil loss were studied with 137Cs and soil nutrient elements in the karst area.The conclusion was made in the following： The soil moved downward along the slope in the barren land of the karst mountain valley area while the soil moved down the profile because of the existence of soil loss in the vegetable,breaking the law of soil down together.The karst underground soil loss often happened in the area with high rocks exposed rate and strong man-made interference.TN,TP and organic matter in the wasteland of hillside increased downward the slope while the same phenomenon didn＇t happen in the vegetable because of the soil loss.But the soil nutrient elements still follows the properties in the non-karst area that the soil nutrient elements decreased with the increase of the depth.Significant correlation existed between 137Cs and soil nutrient elements,which explained that both soil organic matter and 137Cs moved with the same physical rule.
出处
《水土保持学报》
CSCD
北大核心
2010年第6期16-19,23,共5页
Journal of Soil and Water Conservation
基金
重庆市科委项目(CSTC2007BC7001
CSTC2009BA0002)
国家科技支撑计划课题(2006BAC01A16)
国家自然科学基金(40801077)
教育部重点项目(209100)
重庆市自然科学基金(CSTC
2008BB7367)
科技部国际合作项目(2008GR1256)
重庆师范大学青年基金(08XWQ39)
西南大学研究生创新基金项目(kb2009004)
重庆市教委人文社科项目(10SkE15)
国家林业局948项目(2009-4-20)
关键词
岩溶槽谷区
137Cs
土壤营养元素
流失
地下漏失
karst valley area
137Cs
soil nutrient element
surface erosion
undergroud soil loss
