前言关于水土保持功能的评价,以往虽然也考虑了流域的地区性及特殊性等因素,进行了长期的多种多样的调查研究工作,但是得到的结论大部分是个别的或定性的,对于社会影响来说;还多半是停留在局限的或抽象的阶段.因此,可以认为各流域试验场地的调查,实验研究成果,在当前很难说是得到了充分的、有效的利用. Foreword Regarding the evaluation of soil and water conservation functions, although various surveys and researches have been carried out for a long time even though the regional and peculiarities of the watershed have also been taken into consideration, most of the conclusions obtained are individual or qualitative. Influence, but also mostly stay in the limited or abstract stage, therefore, we can think that the investigation and experimental research results of the test sites in various watersheds can hardly be said to have been fully and effectively utilized at present.