引入地位指数和密度指数可大幅提高林龄单因变量平均高生长模型的拟合度。
Repameterizing the average tree height growth model improved the fitting results a lot by introducing site index and density index variables.
土壤水亏缺及杨树遮荫等其它原因造成复合系统农作物减产趋于严重，其中林龄3年的杨农复合系统的小麦玉米产量减产平均达到35%。
The production of crops in agroforestry decreased seriously because of lacking of soil water and illumination and so on, production of wheat and corn in 3 years agroforestry system decreased by 35%.
苔藓最大持水率平均为945%，在林龄和海拔间差异不显著；
The mean MWHR of moss was 945% and there was no significant difference among stands with different ages and located at different elevations.
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