摘要
热带地区质量磁化率因受众多因素作用 ,不能反映土壤发育状况。同时 ,利用 DCB溶液处理热带地区高度发育的土壤样品 ,由于土壤次生超顺磁的磁性矿物不能完全溶解、去除 ,所以处理后样品磁化率或处理前后磁化率差值与土壤风化成土年龄和发育程度没有较好的相关性 ,说明该方法用于区分热带地区土壤中原生和次生磁性矿物对磁化率的贡献和推断土壤发育程度是不适合的。土壤频率磁化率因主要受风化成土作用强度影响 ,所以能够较好地指示土壤发育程度和相对成土年龄。
Numerous factors tell that magnetic susceptibility cannot demonstrate soil development degrees in tropical regions.For secondary magnetic minerals with super magnetism in highly developed soils couldnt dissolve in DCB solution completely,magnetic susceptibilities of soils treated with DCB solution or differences of magnetic susceptibilities between samples before or after the treatment are not correlative to soil ages or soil development degrees closely.Consequently,the method is unsuitable to determine what contributions primary magnetic minerals or secondary magnetic minerals make to susceptibilities and to estimate soil development degrees in tropical region.Frequency dependent susceptibility,however,dominantly influenced by the intensity of rock weathering and soil formation,can indicate soil development degrees and relative soil ages.
出处
《海洋地质与第四纪地质》
CAS
CSCD
北大核心
2000年第4期62-68,共7页
Marine Geology & Quaternary Geology
基金
国家自然科学基金重点资助项目!(498310 0 4)
