There are notable differences of N concentration ,P concentration ,C:N ratio and C:P ratio between leaves on the surface and those 5cm below the surface .

• 林型和时间对N浓度、P浓度、C/N比、C/P比变化趋势产生影响。 同一种林型内地表和地下5厘米处叶片对N浓度、P浓度、C/N比、C/P比变化趋势也会产生影响。