报道了一年生大青杨苗吸肥规律及苗木干物质和主要营养元素积累与分配的动态变化。结果表明，苗木形成１ｋｇ干物质对氮、磷、钾的需要量为：Ｎ２４４２ｇ，Ｐ２Ｏ５５３４ｇ，Ｋ２Ｏ１５５９ｇ。其吸肥规律为前期对氮、磷、钾的吸收分别占其总量的２２６９％，２４６８％，２９７３；中期占５５０８％，５３６８％，５１１３％；后期占２２２４％，２１６４％，１９１４％。前、中、后期吸收Ｎ∶Ｐ２Ｏ５∶Ｋ２Ｏ分别为１∶１∶１０９∶１３１，１∶０９７∶０９３和１∶０９７∶０８６ Reported the annual growth of young poplar seedlings fertilizer law and seedling dry matter and the main nutrient elements of the dynamic changes in the accumulation and distribution. The results showed that the requirement of 1kg dry matter for seedling to nitrogen, phosphorus and potassium was: N2442g, P2O5534g, K2O1559g. The law of absorption of fertilizer was 22.69%, 24.68% and 29.73% of the total amount of absorption of nitrogen, phosphorus and potassium respectively in the early period, 55.08%, 53.68% and 51.13% in the medium term, ; Late accounted for 22  24%, 2164%, 19  14%. Before, during and after the absorption of N: P2O5: K2O were 1: 1: 109: 1 31, 1: 0 97: 93 and 1: 0 97: