与上坡位比较，中坡位和下坡位土壤质量有所改善，反之，可以认为上坡位的土壤质量有退化的趋势。
Compared with that of upper slope, the soil quality of middle slope and lower slope improves, contrarily, the soil quality of upper slope can be considered to have the tendency to degenerate.
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.
在这一进程中，美国天才作家埃德加·爱伦·坡无疑是一位伟大的先行者。
Among this process, the Amercian genius writer Edgar Allan Poe undoubtedly was a great forerunner.
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