以黄土高原南部3 ～15°缓坡耕地为对象,以彬县、永寿、西峰、黄龙、耀县、淳化149 场侵蚀性降雨为样本,研究得出本区侵蚀降雨能量最大值为2 160.42 Jm2 ,最小值为34.53 Jm2 ,平均值为331.47 Jm2 ;径流能量最大值为741.5 Jm2 ,最小值为0 .272 Jm2 ,平均值为98 .4 Jm2 。不同降雨量、降雨历时、降雨强度量级中,侵蚀能量数量特征不同;降雨能量基本与降雨量的增加呈正相关,径流能量以50 mm 降雨量为界,形成增幅大小不同2 个区间。依据降雨量、降雨强度可将降雨能量划分为低雨强中雨型、高雨强中雨型、低雨强暴雨型和低雨强特大暴雨型4 级;依据平均径流深可将径流能量划分为浅水深低能量、中水深低中能量和大水深高能量3 级。 In order to study the erosive rainfalls of 149 sites in Binxian, Yongshou, Xifeng, Huanglong, Yao County and Chunhua plots, the maximum rainfall energy of erosion in this area was 2 160.42 J m2, the minimum value is 34.53 Jm2, the average value is 331.47 Jm2; the maximum runoff energy is 741.5 Jm2, the minimum value is 0.272 Jm2, and the average value is 98.4 Jm2. In different rainfall, rainfall duration and rainfall intensity, the quantity of erosion energy is different. The rainfall energy is basically related to the increase of rainfall, and the runoff energy is formed by 50 mm rainfall, forming two different amplitudes. Based on the rainfall and rainfall intensity, the rainfall energy can be divided into 4 classes: low-rainfall strong moderate-rainfall type, high-intensity heavy rainfall type, low rainfall heavy rainfall type and low rainfall heavy rainfall type. According to the average runoff depth, the runoff energy can be divided into shallow water Deep Energy, Deep Water Medium Energy and Deep Water Energy 3.