桉树接种固氮菌效果的研究

STUDY ON INOCULATION WITH NITROGENFIXING BACTERIA IN EUCALYPT SEEDLINGS

试验表明接种固氮菌能显著提高桉树苗木的生长及苗木各器官的生物量和Ｎ含量，接种苗木高生长比对照（不接种）增加２９．８１％、叶片数增加３７．３１％、叶片干重增加３５．０１％、茎干重增加５５．５９％、根干重增加７８．９３％、总生物量干重增加５５．８９％。不同菌株的增产效果存在差异，接种催娩克氏菌的效果较接种阴沟肠杆菌的好。接种＋施Ｎ８０ｍｇ／株处理的效果优于接种＋施Ｎ３０ｍｇ／株处理的效果。接种与施Ｎ肥的分析结果表明接种催娩克氏菌的效果等于施Ｎ８０ｍｇ／株的效果。

The experiments showed that the effect of inoculation on eucalypt was distinctive. The Eucalyptus urophylla seedlings inoculated with Klebsiella oxytoca and Enterobacter cloacae strains were 29.81%, 37.31%, 35.01%, 55.59%, 78.93% and 55.89% greater in height growth, leaf number, leaf and stem dry matter, root and total dry matter than the control (noinoculation). The seedlings with different nitrogenfixing bacteria displayed distinct differences on growth. Those inoculated with the Klebsiella oxytoca strains were better than that with Enterobacter cloacae and theri height growth, leaf , stem and root dry matter were increased by 41.89 %,93.23%,107.09% and 127.12% in comparison with the uninoculated seedlings in three months. The fertilization+inoculation experiments showed that the seedlings applied with 80 mg N and the seedlings inoculated with Klebsiella oxytoca strains were the best. \;