基于化学蚀变指数(CIA)的辽河流域土壤风化程度研究

研究选取CIA风化程度指数对辽河流域土壤风化程度进行评价分析,取得的成果如下:辽河流域深表层土壤风化的程度差异不大,整体上辽河流域土壤的风化程度极低;从空间分布特征看,表层和深层土壤元素含量分布具有一致性,呈U型分布:东部高于西部,两侧高于中央;各类型土壤中以水稻土和黑土的风化程度最高,风沙土、潮土相对其他的土壤类型风化程度较低;以地貌类型划分的土壤类型中,平原区土壤CIA值最高,风化程度高于丘陵区、低山丘陵区和低山区.

Study of the Soil Weathering Degree of the Liao River Basin Based on CIA Index

The soil weathering degree of the Liao River Basin was studied on the basis of CIA index.It is shown that the soil weathering degree is generally very low in the Liao River Basin and there is no much difference between the deep and surface layers of the soil.The element spatial distribution of the deep and surface layers of the soil is U-type.The element content in the east is higher than that of the west,while it shows the lowest in the center.The weathering degree of the paddy soil and black soil is the highest in all types of soil,on the contrary,the aeolian sandy soil and fluvo-aquic soil show the lowest degree.In the case of geomorphologic one,the CIA value of the plain area is the highest with soil weathering degree higher than that of the mountain hilly area,the hilly and low mountain areas.