According to the principle of greening for fixing soil on slope, the slope is stabilized, water and soil conserved, and environment beautified by means of greening rock slope.

根据边坡植被固土绿化的原理，在石质边坡上进行植被绿化，稳定边坡、保持水土、美化环境。

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Under the artificial vegetation, soil forming process has been started although it is still in an initial stage, and the biological sand-fixing effect is obvious.

人工调控下的绿地，流沙开始成土发育，但发育仍处于初级较低水平，生物固沙取得明显效果。

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He acknowledged that any soil used to grow nitrogen-fixing plants or were fertilised for agricultural reasons would result in an increase in gases involved in the formation of ozone.

BBC: Invasive plant 'increases ozone pollution'