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Effect of different nitrogen forms on growth of Fraxinus mandshurica seedlings.

ZHANG Yandong(Xishuangbanna Tropical Botanic Garden,Chinese Academy of Sciences,Kunming 650223) ,FAN Zhiqiang,WANG Qingcheng,WANG Zhenquan( School of Forest Resource and Environment,Northeast Forestry University,Harbin 15040).  
The effect of NO\+-\-3 N and NH\++\-4 N and their different supply ratios on the growth of Fraxinus mandshurica seedlings was studied by sand culture in greenhouse.The highest seedling growth was obtained at a NH\+-\-3 N/NH\++\-4 N ratio of 75/25 in nutrient solution.The growth of seedlings declined with the increasing ratio of NH\++\-4 N to NO\+-\-3 N. Excessive NH\++\-4 N inhibited root growth,and the root/shoot ratio of the seedlings significantly decreased as the NH\++\-4 N/NO\+-\-3 N ratio was over 50%.Increasing NH\++\-4 N in nutrient solution led to the decrease of net photosynthetic rate,the increase of phosphorus content in plant tissues,and the decrease of Zn and Fe contents.The pH value of cultural medium was affected markedly by nitrogen form,which was increased with increasing NO\+-\-3 N and decreased with increasing NH\++\-4 N in nutrient solution.The pH value was up to 7\^22 in the medium contained NO\+-\-3 N alone,while decreased to 4\^20 only with NH\++\-4 N.
【Fund】: 国家”九五”科技攻关项目!(96 0 1 1 0 2 0 1 )
【CateGory Index】: S718
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