氧化铁对土粒强胶结作用的矿物学证据  

Mineralogical Evidence for Strong Cementation of Soil Particles by Iron Oxides

作　　者：胡国成[1] 章明奎[2] 

机构地区：[1]浙江省临安市农业局,浙江临安311300 [2]浙江大学资源科学系,浙江杭州310029

出　　处：《土壤通报》2002年第1期25-27,共3页Chinese Journal of Soil Science

摘　　要：DCB脱铁处理高铁土壤前后用NaOH -超声波分散的四个粒级 (<2 μm、2～ 2 0 μm、2 0～ 2 5 0 μm和 2 5 0～2 0 0 0 μm)的矿物组成变化研究表明 :氧化铁对土壤颗粒有很强的胶结能力 ,它可与高岭石、蒙脱石等粘粒矿物胶结形成非常稳定的大颗粒团聚体 ,这些团聚体即使用NaOHThe minerals of four size separates obtained from two high oxide soils were studied by removing iron oxides with dithionthite-citrate-bicarbonate(DCB),followed by NaOH-ultrasonic dispersion,or directly using NaOH-ultrasonic dispersion.The XRD patterns showed that clay minerals(such as kao1inite?smectite and oxides)were found in significant quantities in sand size separates obtained directly by treating soil with NaOH-ultrasonic dispersion,whereas they were very low in sand size separates after DCB treatment.The difference in mineral compositions of the four separate before and after iron oxide removel demonstrated that iron oxides had very strong cementing capacity and could cement some clay minerals to form very stable aggregates,which were stable to NaOH-ultrasonic dispersion.

关 键 词：氧化铁 稳定性团聚体 胶结作用 矿物学证据 X射线衍射 土壤颗粒 

分 类 号：S153.61[农业科学—土壤学]