森林覆被率在保持水土、涵养水源、改善生态环境方面起着很大作用。
The rate of coverage of forest have an evident effect on many environment factors such as soil and water reservation ecological environment improvement.
在过去20年，中国通过统一的植树造林规划和大面积天然林禁伐，使森林覆被率从12%增加到18%以上。
Over the past 20 years, China's forest cover has grown from around 12 percent to more than 18 percent through a concerted reforestation program and a ban on logging across vast areas of the country.
从水分平衡分析得出，森林覆被率高出一定值时，地下水位下降，在森林覆被率为29.9%左右时，环境因子处于最佳阶段。
Analyzing the moisture content balance with the rate of forest coverage increase in straight ground water lever fall. Around 29.9% of the rate of forest coverage environment factor stay best stage.
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