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本文通过沙培盆栽试验研究了１年生杨树、刺槐及两者混植对矿物Ｋ的利用，并采用封闭循环系统对树木生长过程中不同形态的变化进行了严格的数量化研究，同时研究了缺Ｋ胁迫下对矿物Ｋ的利用及对Ｎ，Ｐ，Ｋ积累的影响．结果表明：杨树、刺槐都可不同程度吸收矿物Ｋ，两者混交后利用矿物Ｋ的量有很大提高；缺Ｋ胁迫可提高植物吸收矿物Ｋ的量；缺Ｋ主要抑制根系生长，对地上部分影响较小；Ｋ元素对Ｎ的影响较大，对Ｐ的影响较小．
In this paper, we studied the use of 1-year-old Poplar, Robinia pseudoacacia, and their combination on the mineral K by means of sand culture and pot experiment. The closed-loop system was used to conduct rigorous quantitative research on the changes of different morphologies during the growth of trees. Effect of K on Mineral K Utilization and Accumulation of N, P, K under Stress. The results showed that Poplar and Robinia pseudoacacia could both absorb minerals K to different extents, and the amount of mineral K could be greatly increased after mixed with each other. Lack of K could increase the amount of mineral K absorbed by plants. Lack of K mainly inhibited root growth, Part of the impact of smaller; K element of N greater impact on the P less affected.