论文部分内容阅读
为了研究尺度变化对红壤区梯田果园养分随地表径流流失的影响,通过2011年4–9月份在江西省水土保持生态科技园的野外试验,对比分析了径流小区尺度(处理1)和自然大坡面尺度(处理2)在2种典型降雨下的产流、产沙以及N、P流失特征。结果表明:具有相似下垫面条件的处理1和处理2相比,中雨型条件下处理2单位面积产流、产沙量分别为处理1的23.09%、13.63%,大雨型条件下处理2单位面积产流、产沙量分别为处理1的27.49%、13.72%,其产流产沙过程基本一致,都是随着降雨强度的变化而变化;各处理养分流失主要集中在产流初期,后期逐渐趋于稳定。
In order to study the effect of scale changes on runoff loss of terraced orchard in red soil area with surface runoff, a field experiment of soil and water conservation eco-science and technology park in Jiangxi Province from April to September in 2011 was conducted to compare and analyze the effects of runoff plot size (Treatment 1) Surface scale (Treatment 2) Runoff, sediment yield and N, P loss characteristics under two typical rainfalls. The results showed that compared with treatments 1 and 2, under the condition of medium rain type, the runoff yield per unit area was 2.09% and 13.63% of that of treatments 1 and 2 respectively The runoff and sediment yield per unit area were 27.49% and 13.72% of that of treatment 1, respectively. The process of runoff and sediment yield was basically the same, all of them changed with the change of rainfall intensity. The nutrient loss of each treatment mainly concentrated in the initial stage and later stage Gradually stabilized.