利用CT扫描技术对太湖地区主要水稻土中大孔隙的研究  

Study on Macropore in Main Paddy Soils in Tai-Lake Region With CT

作　　者：吴华山[1] 陈效民[1] 陈粲[2] 

机构地区：[1]南京农业大学资源与环境科学学院,江苏南京210095 [2]南京工业大学土木工程学院,江苏南京210009

出　　处：《水土保持学报》2007年第2期175-178,共4页Journal of Soil and Water Conservation

基　　金：国家自然科学基金项目(40371055);高等学校博士学科点专项科研基金(20030307018)资助

摘　　要：采集了太湖地区3种主要水稻土（白土、黄泥土和乌栅土）的原状土柱为供试土样，利用CT扫描技术，在不破坏土体结构的前提下，准确地得出了不同深度土壤剖面上各种大孔隙的数量、面积以及分布状况。结果表明，3种水稻土均以表层的大孔隙度最大，在30～40cm处达到一个最低点，再往下又呈波浪形变化。土柱各截面上大孔隙面积的变异系数随着深度的变化与大孔隙度相似，大孔隙度大的层次其变异系数也较大。等效直径越大的孔隙（〉5mm）在土壤不同深度下数量的变化也越大。表层上大直径（〉5mm）的大孔隙较多，在土壤剖面30～40cm以下其数量急剧减少；而直径较小孔隙（〈1mm）的数量在土壤剖面不同深度下相差不大。The original soil columns were collected in the three main paddy soils （Bai soil, Huangni soil and Wushan soil） in Tai-Lake region, which were studied with CT scanning, the amount, proportion and distributing of macropore in any section could be analyzed accurately without destroy. The results showed that. the macropore degree was the largest in surface layer, which reached minimum in the depth of 30～40 cm, then changed as wave along with the increase of depth. The trend of coefficient of variation of macropore proportion was similar to the macropre degree in the soil profiles. The pore was larger, variety of amount was more obvious. The larger macropore （〉 5mm ） in surface layer was much more than other layers, which decreased rapidly under 30～40 era. The amount of smaller maeropore （〈1mm） changed gently in all layers.

关 键 词：CT扫描 太湖 大孔隙 

分 类 号：S152.5[农业科学—土壤学]