灌木层中乔木树种和阳性乔灌木种类比例、相对密度和重要值均随坡位梯度从下部到上部逐渐增大。

Percentage, relative density and importance values of tree species and intolerant tree and shrub species increased while slope gradient from lower to upper.

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落叶树种在华北地区的种植比例很高，因此，落叶乔灌木植物的冬态造景尤为重要。

The high proportion of deciduous tree and shrub in North China makes it important to make scene of deciduous tree and shrub form in winter.

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