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本文在前人研究的基础上，通过对水土流失现象，水土保持林以及森林覆盖率与土壤流失量（或侵蚀模数）的综合分析，首次定义水土保持林有效覆盖率（ＥＣＲ）为在水土保持林防护范围内土壤流失量等于或小于允许流失量时的森林覆盖率。并提出了确定方法，还以黄土高原水土流失区为例，初步确定了该区的水土保持林的ＥＣＲ约为４３％，并以黄土高原１１个试区（１９８６～１９９０年）定位研究结果进行了初步验证
Based on the previous studies, based on the comprehensive analysis of soil and water loss, soil and water conservation forests, forest cover and soil erosion (or erosion modulus), this paper first defines the effective coverage of water and soil conservation forests (ECR) Maintain forest cover at or below the permissible level of forest loss within the scope of forest protection. And put forward the determination method. Taking the soil and water loss area of the Loess Plateau as an example, the ECR of the soil and water conservation forest in this area was preliminarily determined to be about 43%. Based on the results of the positioning study in 11 pilot areas of the Loess Plateau (1986-1990) A preliminary verification