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用灌施和管施方法研究了纯林和混交林中长白落叶松与水曲柳对3 2 P的吸收及利用。结果表明 ,树木对3 2 P的吸收、运转很快 ,施3 2 P的当日即达冠层。3 2 P在树冠上层分布最多 ,中层次之 ,下层最少。灌施时3 2 P在树冠阳面分布较多 ;管施时在树冠阴面分布较多。灌施时混交林中树木对3 2 P的吸收多于纯林 ;管施时纯林中树木对3 2 P的吸收多于混交林。各林型中水曲柳对3 2 P的吸收均明显多于长白落叶松。树木可通过根系接触直接交换3 2 P ,混交林中异种树木间3 2 P交换量最多。长白落叶松与水曲柳种间营养关系协调 ,混交后根系接触较多 ,分布趋于合理 ,改善了树木的磷营养状况 ,提高了生产力
The application and application of 3 2 P by P. lanceolata and S. bungeana in pure and mixed forests were studied by means of irrigation and tube application. The results showed that the absorption of 3 2 P by trees was fast and reached the canopy on the day of application of 32 P. 3 2 P is the most widely distributed in the canopy, with the lowest level in the middle level. When applied, 3 2 P was more distributed in the canopy of the canopy; there were more distributions of canopy in the canopy when the tube was applied. In the mixed forest, the absorption of 3 2 P by the trees in the mixed forest was more than that in the pure forest. The absorption of 32 P by the trees in the pure forest was more than that in the mixed forest. The absorption of 3 2 P in Fraxinus mandshurica forest was significantly higher than that of Larix olgensis in each forest. Trees can exchange 32 P directly through root contact, while 3 2 P exchange among heterogeneous trees in mixed forest is the most. The relationship between the nutrition of Changbai Larch and Fraxinus mandshurica was coordinated, the root contact was more after mixed, the distribution tended to be reasonable, the phosphorus nutrition of trees was improved and the productivity was improved