Results of simulating Experiment on Normal Integral Model of different forest and grass coverage degrees,show that forest and grass measures of small watershed are effective in reducing runoff and sediments.They can attain initially the lowest value of 60 percent and the best value of 78 percent in conserving soil and water by taking forest and grass measures for small watershed management, giving the critical value of 65 percent of runoff and infiltration ratio for small watershed.
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