如何评价黄土高原自然侵蚀与人为加速侵蚀作用 ，恢复与重建植被的可能性和必要性等是近年来治理黄河的热点问题。
There have been many arguments on how to evaluate the natural erosion and man_made accelerated erosion, the possibility to recover and rebuild vegetation on loess plateau.
一切非自然的植被恢复都是人工绿化。
All restoration of plants against nature is artificial greening.
在荒漠植被难以自然发生的次生裸地，当不易获得水源时，可采用无灌溉人工植苗造林和直播造林方法进行植被恢复重建。
Planting and seeding can restore and reconstruct vegetation in without irrigation region on condition that water is short in secondary bare land.
直播造林在石质山地植被恢复中具有明显效果，自然演替恢复效果较差。
It is a useful practical technology for direct seeding in vegetation restoration, while method of natural succession can not be used.
直播造林在石质山地植被恢复中具有明显效果，自然演替恢复效果较差。
It is a useful practical technology for direct seeding in vegetation restoration, while method of natural succession can not be used.
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