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当前我省各地在开展以小流域为单元的水土保持综合治理中,均把林草措施放在重要位置。林草保持水土的作用主要表现在截留天然降雨、调节地表径流、涵养水源、固持和改良土壤等方面,由于地区、立地条件、营林种草方式、林草组成、覆盖层、郁闭度、生长年限等状况的不同,其保持水土效益有很大差异。为科学地设计水土保持林的各林种,合理地确定林草防护体系比例,我们特对林草保持水土的效益进行了研究,现将初步结果介绍如下。
At present, all the provinces in our country carry out the small watershed as a unit of comprehensive management of soil and water conservation, forest and grass measures are placed in an important position. The main function of forest and grass to conserve soil and water is mainly to intercept natural rainfall, regulate surface runoff, conserve water sources, maintain and improve soil, etc. Due to the different conditions of grassland, grassland, forest and grass, cover, canopy density, Growth period and other conditions, their water and soil conservation have very different benefits. In order to scientifically design various kinds of forest for soil and water conservation forests and rationally determine the proportion of forest and grass protection systems, we have studied the benefits of forest and grass conservation. The preliminary results are as follows.