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.

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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.

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