West limestone dry stone mountain, central as the Loess Plateau hilly region and the Taiwan area, the eastern plains area, 731-1716 m above sea level in between.

西部为石灰岩干石山区，中部为黄土丘陵区和台塬区，东部为平原区，海拔高度在731-1716米之间。

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So the grass, and arbor vegetation should be rehabilitated and developed quickly in order to decrease soil erosion in Hilly-gully region of Loess Plateau, and then decrease soil nutrients loss.

因此，该地区要注意建设和恢复草、灌植被，使之尽快起到水土保持作用，近而减少土壤养分流失。

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Comparison of dryland potential yield increase in gully and hilly regions of Loess Plateau shows that potential yield increase in hilly region is 117.6%, and only 56.6%in gully region.

在黄土台塬区和丘陵区中，丘陵区的粮食增产潜力较台塬区大，前者尚有117.6 %增产能力，后者仅56.6%。

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