利用染色示踪与图像处理术研究根系对土壤大孔隙的影响

Root influence on soil macropores by dye tracing and image processing technology

以定西安家沟流域油松、柠条根部土壤为例介绍了染色示踪和图像处理技术在土壤大孔隙研究中的应用,分析根系对土壤大孔隙的影响.将配制好的示踪溶液沿树基部渗入土壤,可获得具有颜色深浅不同的土壤染色剖面.土壤孔隙越大,充斥的染料溶液就越多,所染的颜色就越深,反之则浅.据此利用地理信息系统软件ArcGIS和遥感图像处理软件ERDAS对染色土壤剖面图像进行处理并分级计算,计算染色的等级以及染色面积.结果表明染色等级高以及染色面积大的区域一般出现在根系密度较大的地方,并且对染色示踪方法的影响因素进行了讨论.

Taking the soil in Anjiagou catchment for a case study, the relationship between roots and soil macropores was analyzed by the dyeing tracing and image processing technology. The dye tracing solution was infiltrated through the soil along the trunk or branches of trees and stained soil profiles with different shades of color were obtained. The bigger the macropores were, the more the dye solution was poured, and the darker the color of the stained region was. Images of the soil profiles dyed were processed with ArcGIS and remote sensing image processing software （ERDAS） for color classification. The dyeing areas of a different classification were then calculated and the results show that the higher dyeing level and large dyeing area appeared in soil surface and in places with roots. The factors that influence soil pore quantification were also discussed.