So that, according to the field study actual for many years, authors work the new evaluation system of the intensity of urban water and soil losses and its environment effect for reference.
因此，作者根据多年野外考察工作的实际，尝试性地总结出一套城市水土流失强度及其对环境影响的评价体系，供同行参考。
Due to fewer rainfall, lean soil, serious soil and water loss and the long term negative effect of human activity, the ecological environment in hilly semi arid area is being degraded.
低山丘陵半干旱区气候干旱、土地贫瘠、水土流失严重，加上人类活动的长期负面影响，使得该地区生态环境不断恶化。
The rate of coverage of forest have an evident effect on many environment factors such as soil and water reservation ecological environment improvement.
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。
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