对7年生鲁山杨中成林进行了施肥试验，结果表明：施肥1年后，施有机肥1 kg／株的处理胸径生长量、单株材积生长量和蓄积生长量均为最大，分别比对照提高43％、31％和31％；施肥2年后，施有机肥2 kg／株的处理胸径生长量、树高生长量最大，分别比对照提高31％和44％，施1 kg／株的处理单株材积生长量、蓄积生长量最大，均比对照提高42％，与对照有极显著差异。从成本效益方面看，施有机肥1 kg／株的处理投入最低，利润最高，投入－产出比最高。因此，从追肥后杨树生长量和成本效益综合考虑，杨树中成林施有机肥1 kg／株效果较好。%The fertilization trial on the mid-aged forest of P.×liaoningensis Z.Wang et.H.D.Chen sp.nov.for the 7-year-old plantation was conducted,the results showed that the forest stand DBH growth,the single tree volume growth and the forest stand volume growth were the greatest with applying organic fertilizer the number of 1 kg per plant after a year,which increased 43%,31% and 31% than that of the contrast;the forest stand DBH growth and the tree height growth were the greatest with applying organic fertilizer the nunber of 2 kg per plant after two years,which increased 31% and 44% than that of the contrast,and the single tree volume growth and the forest stand volume growth were the greatest with applying organic fertilizer the nunber of 1 kg per plant,which increased 42% and 42% than that of the con-trast.From a cost-effectiveness perspective,applying organic fertilizer the number of 1 kg per plant had the highest profits and the input-output ratio.Therefore,comprehensive consideration of the poplar growth and cost-effective,the effect is the best for the poplars’mid-aged forest applying organic fertilizer the number of 1 kg per plant.
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