中文摘要：

表面下的流动是在在上面的长江盆泼出紫色土壤的陆地的一个突出的流量过程。然而，识别并且确定仍然保持困难。在这研究，在 situ 流量，试验性的阴谋被用来用收集马槽孤立和陆上的流动和表面下的流动用一连串的时间领域反射计(TDR ) 测量土壤潮湿动力学。优先的流动的频率通过土壤性质，地形学，降雨紧张，起始的湿，和耕种的联合分析在降雨事件和表面下的流动过程的控制期间被调查。当优先的流动出现的频率是很低的时，结果证明那表面下的流动由于开发得好的 macropores 在紫色土壤侧面是无所不在的，特别在表面土壤(仅仅在阴谋 C 的 2 个案例) 在所有 22 个降雨事件期间。干燥先前的潮湿条件支持了优先的流动的出现。然而，在不同深度和各种各样的斜坡位置的土壤潮湿的连续即时监视在集中的暴风雨期间暗示了多重表面下的侧面的流动的可能的出现。降雨紧张，耕种操作，和土壤性质在学习区域作为表面下的流动的主要控制被认出，它为在这个区域减轻表面下的流动的不利环境效果允许管理惯例的优化。

英文摘要：

Subsurface flow is a prominent runoff process in sloping lands of purple soil in the upper Yangtze River basin.However,it remains difficult to identify and quantify.In this study,in situ runoff experimental plots were used to measure soil moisture dynamics using an array of time domain reflectometry（TDR） together with overland flow and subsurface flow using isolated collecting troughs.Frequency of preferential flow during rainfall events and the controls of subsurface flow processes were investigated through combined analysis of soil properties,topography,rainfall intensity,initial wetness,and tillage.Results showed that subsurface flow was ubiquitous in purple soil profiles due to welldeveloped macropores,especially in surface soils while frequency of preferential flow occurrence was very low（only 2 cases in plot C） during all 22 rainfall events.Dry antecedent moisture conditions promoted the occurrence of preferential flow.However,consecutive real-time monitoring of soil moisture at different depths and various slope positions implied the possible occurrence of multiple subsurface lateral flows during intensive storms.Rainfall intensity,tillage operation,and soil properties were recognized as main controls of subsurface flow in the study area,which allows the optimization of management practices for alleviating adverse environmental effects of subsurface flow in the region.