In the edge of the loess hill area, there are 134 species of seed plants, which belong to 93 genera and 42 families.Their the proportions in ecotone are 37.85% .45.59% 65.63% respectively.

• 同时，发现黄土丘陵区泛热带成分分布的多种灌木均自然分布在极端干旱的阳坡地段，这种区系的分布类型与生态适应性之间的关系值得进一步研究。