【摘要】 确定标准小区在土壤侵蚀预报中具有重要意义 ,也是进行土壤侵蚀规律研究的必要基础。文中根据我国的自然环境条件、土壤侵蚀特征、农业生产特点 ,通过分析土壤侵蚀发生的地形特点、已有资料的坡度变化范围 ,以及土壤流失量估算中的误差变化规律 ,提出并论证了我国土壤侵蚀研究中的标准小区应选定 1 5°坡度、 2 0 m坡长、 5m宽的清耕休闲地。小区每年按传统方法准备成苗床 ,并按当地农作习惯适时中耕 ,保证没有明显的杂草生长。更多还原

【Abstract】 Determination of unit plot is very important for soil loss prediction, it is also a key base to researches on erosion mechanism. According to environmental conditions, characteristics of soil erosion and agricultural production, standard of unit plot in China was studied based on analysis of landform features of erosive regions, previous data from field observation, and error diffusion in soil loss prediction. The Standard of Unit Plot in Soil Loss Prediction of China was put forward, the unit plot is 20 m long, 5 m wide, with a uniform length wise slope of 15°, in continuous fallow and preparation in accordance with local farming system.更多还原