摘要
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 。
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.
出处
《林业科学》
CAS
CSCD
北大核心
2000年第2期20-25,共6页
Scientia Silvae Sinicae
基金
国家自然科学基金 !( 3 9170 63 0 )
关键词
长白落叶松
水曲柳
营养关系
混交林
磷
同位素
Larix olgensis\% Henry, \%Fraxinus mandshurica\% Rupr, ^(32) P, Nutrition relationship, Mixed stand, The mechanism of increasing production
