摘要
通过比较研究，探讨了坡地赤红壤结构退化过程的特征．结果表明，与地带性自然植被下的坡地赤红壤比较，次生植被或人工植被下的坡地赤红壤结构退化现象明显，表现在表土砂化，即砂粒含量相对增加，粘粒含量相对减少；土壤结构稳定性下降，主要体现在较大粒径水稳性团聚体减少；土壤孔隙性变差，主要体现在容重增加和较大孔径孔隙减少．对自然赤红壤而言，容重增加、较大孔隙减少更为明显：对耕型赤红壤而言，土壤结构稳定性下降，表土砂化更为突出．
This paper deals with the soil structure degradation characteristics of latored soils. Result showed that, compared with the lated soils under zonal natural vegetation the ones under secondary vegetation or man-maded vegetation suffered structure degradation It was found that the structure degradation of latored soils was characterized by sandilication of surface layer by lowering of .aggregates stability, presented mainly by less big aggregates; by soil porosity deterioration.presented principally by increasing of bulk density and lowering of big pores. For natural latered siols, the increasing of bulk density and the decreasing of big pores were more obvious. Moreover, for cultivated ones, the lowering of aggregates stability and sandification of surface layer were mere serious.
基金
中国科学院广州分院
广东省科学院院长基金
国家人事部非教育系统留学回国人员科技活动择优资助
关键词
坡地
赤红壤
物理退化
团聚体
孔隙
soil structure degradation sandification, aggregates, pores
