长白落叶松与水曲柳磷素营养关系的研究

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＾３２Ｐ的吸收及利用。结果表明，树木对＾３２Ｐ的吸收，运转很快，施＾３２Ｐ的当日即达冠层。＾３２Ｐ在树冠上层分布最多，中层次之，下层最少。灌施时＾３２Ｐ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＾３２Ｐ的吸收多地纯林；管施时纯林中树木对＾３２Ｐ，混交林中异种树木间＾３２Ｐ交换量最多。长白落叶松与水曲柳种间营养关系协调，

STUDIES ON THE NUTRITION RELATIONSHIP OF PHOSPHORUS BETWEEN LARIX OLGENSIS HENRY AND FRAXINUS MANDSHURICA RUPR

Absorption and utilization of 32 P of \%Larix olgensis\% Henry and \%Fraxinus mandshurica\% Rupr, applied by pouring and with tube, were studied in pure and mixed stand. The result showed that absorption and transport of 32 P of trees were very fast, and 32 P reached crown at the date treated. 32 P distributing in higher level of crown was the most; that in middle level of crown came second; and that in lower level of crown was the least. 32 P distributing in sun face of crown was more when appling 32 P by pouring; while that in shade face of crown was more when appling 32 P with tube. Absorption of 32 P of trees in mixed stand was more than that in pure stand when appling by pouring; while that in pure stand was more than that in mixed stand when appling with tube. Absorption of 32 P of \%F.mandshurica\% was more than that of \%L.olgensis\% in differnt stand type. Trees could exchange 32 P directly through root system connection, and the mount of exchange of 32 P between different tree species was the most in mixed stand. The nutrition relationship between \%L. olgensis\% and \%F.mandshurica\% was harmonious, and in mixed stand the root system connected more extensively and distributed more rationally, which improved P nutrition condition of trees and raised productivity.