The surface wash and runoff study was carried out using closed erosion plots in Tekala Forest Reserve in Hulu Langat, Selangor. Variation on the rate of surface wash and runoff were analysed for different slope gradient and at varying physical and chemical soil characteristic. It was found that silt and fine sand were subjected to higher erosion rate compared to clay and course sand. Content of fine sand and silt in eroded materials increased in the range of 4.8 to 7.0 % and 11.8 to 22.5% respectively. The average reduction of course sand and clay were 8.6% and 16.0% respectively. The average rate of surface wash at study site were 85.0 g m-2 yr-1 . This was relatively higher compared to soil loss in Sarawak of 35.5 g m-2 yr-1 . There was a significant and positive correlation between rates of surface wash and surface runoff with average product moment correlation, r of 0.75. During the study period, seven extreme events with rainfall greater than 50 mm in single storm were recorded. These storms account for 25% of the total rainfall and 29% of the surface wash during the one year study period between 7th August 1994 to 17th August 1995. There were also positive and significant correlation between slope angle and surface wash (0.92) and the surface runoff (0.77).
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机译：表面冲洗和径流研究是在雪兰莪州Hulu Langat的Tekala森林保护区使用封闭的侵蚀区进行的。对于不同的坡度梯度和不同的物理和化学土壤特性，分析了表面冲刷和径流速率的变化。研究发现，与粘土和粗砂相比，粉砂和细砂的侵蚀速率更高。侵蚀材料中细砂和粉砂的含量分别增加了4.8％至7.0％和11.8％至22.5％。当然，砂土和粘土的平均减少分别为8.6％和16.0％。研究地点的平均表面清洗率为85.0 g m-2 yr-1。与砂拉越35.5 g m-2 yr-1的水土流失相比，这相对较高。表面冲洗率和地表径流量与平均产品弯矩相关系数r为0.75之间存在显着正相关。在研究期间，记录了7次极端事件，一次暴雨的降雨量大于50毫米。在1994年8月7日至1995年8月17日的一年研究期间，这些风暴占总降雨量的25％和地表冲刷的29％。坡度与表面冲刷（0.92）和坡度之间也存在正相关和显着相关性。地表径流（0.77）。
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