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(一)问题的提出 造林整地,拦蓄坡面径流泥沙,可为植物创造良好的生态环境,提高苗木的成活率和幼林生长速度。我地区造林整地的形式,主要是鱼鳞坑、竹节壕、小穴这几种。工程的蓄水标准是按拦蓄当地10年一遇24小时暴雨所产生的径流设计的。对于竹节壕开挖方量和蓄水能力计算比较简单,不必赘述,而对于鱼鳞坑工程,过去一直沿用如下经验公式: 开挖方量与蓄水能力:
(A) the issue of afforestation and soil preparation, blocking runoff and sediment on the slope, the plant can create a good ecological environment, improve seedling survival rate and young growth rate. In our area, afforestation is mainly in the form of fish scale pit, bamboo trench and small hole. The water storage standard of the project is designed according to the runoff generated by the rainstorm in a 24-hour storm once in 10 years. For the calculation of bamboo trenching capacity and storage capacity is relatively simple, do not repeat them, and for the scale-hole pit project, the following empirical formula has been used in the past: The amount of excavation and water storage capacity: