中文摘要：

以南方花岗岩崩岗崩壁不同土层土壤为研究对象,运用染色示踪和Photoshop CS5图像提取技术,记录水平方向上土壤剖面的染色面积和最大染色深度,以分析崩岗崩壁不同土层的水分运动分布特征.结果表明：红土层持水性能高于砂土层和碎屑层,但水分的侧向运移速率低于其他2个土层;在水平方向上10~30 cm内各土层土壤含水量均随深度的增加呈现逐渐减小的趋势;经过24 h染色入渗试验后,砂土层水平方向上0~9 cm和碎屑层0~13 cm内的染色面积均超过80%;红土层优先流现象明显,剖面染色比例小,亮蓝染色剖面呈条带状分布,其染色面积随深度的增加而缓慢下降;砂土层和碎屑层平均染色比例较大,亮蓝染色剖面呈块状均匀分布,并随深度的增加表现出先缓慢下降后迅速下降的趋势.

英文摘要：

To investigate moisture migration characteristics of soil layers in collapsing hill,dye tracer method and image extraction technology were applied to granite-based collapsing hill in Anxi,and dyed area and maximum horizontal filtration depth were recorded. The results showed that water holding capacity of red soil layer was higher than those of sand soil layer and detritus soil layer,while lateral migration rate of red soil was lower than the other two layers. Soil moisture content decreased when soil depth increased from 10 cm to 30 cm. Twenty-four h after dyeing,ratios of dyed area from sandy soil layer within the depth of 9 cm and detritus soil layer within the depth of 13 cm were over 80%. Preferential flow was obvious in red soil layer. Dyeing area ratio of red soil layer was averagely low and dropped along with soil depth,presenting a strip-like profile. Average dyeing area ratios for sand soil layer and detritus soil layer were high with block distribution. Dyed ratio decreased slowly before sharp drop when soil depth increased.