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以杨树的８个无性系为试材，采用土培试验，探讨了无性系间的磷营养效率差异。结果表明杨树无性系之间存在着明显的磷营养效率差异。在缺磷胁迫下（-Ｐ处理）无性系 Ｓ17，Ｓ19和 １０５的地上部分生物量分别为 ５５． １５，４８． ２８和 ４９． ２５ ｇ／株，与磷充足（十Ｐ）处理相比，缺磷胁迫使它们的生物量减少均不超过 ３０％，属于I级高效型无性系。无性系 １０６， ７９７和 Ｉ- ６９的生物量分别为 ３５．４５，３１．４５和 ２８． ３５ ｇ／株，缺磷胁迫使其生物量分别下降 ２９％，４３％和５４％，属磷营养效率低效型无性系为Ⅲ级。无性系１３８８和 ３２４４属磷营养效率极低型无性系，为Ⅳ级，生物量分别只有２３．０５，２３．９４ ｇ／株，缺磷胁迫使其生物量下降约５０％左右。８个无性系中，没有发现磷营养效率为Ⅱ级的无性系。
Eight clones of poplar were used as materials, soil culture experiments were conducted to investigate the difference in phosphorus nutrient efficiency among clones. The results showed that there was a significant difference in phosphorus nutrient efficiency between poplar clones. The above-ground biomass of clones S17, S19 and 105 under phosphorus deficiency stress (-P treatment) was 55, respectively. 15,48. 28 and 49. 25 g / plant, compared with the adequate phosphorus (10 P) treatment, the phosphorus deficiency reduced their biomass by no more than 30%, belonging to class I high-efficiency clones. The biomass of clones 106, 797 and I-69 were 35.45, 31.45 and 28, respectively. 35 g / plant, and phosphorus deficiency reduced the biomass by 29%, 43% and 54%, respectively. Clones 1388 and 3244 are extremely low phosphorus type clonal clones, which are Grade IV with biomass of only 23.05 and 23.94 g / plant respectively, and phosphorus deficiency reduces their biomass by about 50%. Among the eight clones, no clones with grade Ⅱ phosphorus nutrition efficiency were found.