七家子径流小区的试验研究工作,从1954年5月开始。至1956年底止,已经经历了整整三年的时间,并且完成了一个当地的农家耕作制度。尽管这个试验是不很健全的,还达不到科学试验所要求的水平,但经过三年的实践和逐步改进,对于目前绕阳河上游水土流失情况,还是获得了一些轮廓的概念。从这些概 Seven sub-runoff plot experimental research work, from May 1954 onwards. By the end of 1956, it had taken three full years and completed a local farming system. Although this experiment is not perfect and can not reach the level required by scientific experiments, after three years of practice and gradual improvement, some concepts of contouring have been obtained for the current situation of soil and water loss in the upper reaches of the Yangyang River. From these summary