【摘要】 本文对西南红、黄壤矿物组成及电荷特性研究结果表明：红、黄壤是以可变电荷为主的土壤，黄壤的点电荷、永久电荷、可变负电荷都高于红壤，其差异性达极显著。可变电荷零点（pHO）红壤高于黄壤。游离Fe2O3是产生正电荷的物质基础，结果表明红壤高于黄壤，其差异性也达极显著水平。更多还原

【Abstract】 This paper has discussed the studied results about the mineralconstitnent and charge properties of forest red soil and yellow soil insouthwest. The main charges of red soil and yellow soils were variable charges.The total permanent and varible clarges of yellow soil were higher than that ofred soil and difference was reachel significant level. The ZPC of red soil washigher than that of yellow soil. Free Fe2O3 was the basic material formingpositive charge. The free Fe2O3 content of red soil was higher than that ofyellow soil and the difference was reached significant level.更多还原