| 摘要: |
| 摘要：在温室内采用水培的方法研究了不同氮形态配比下，9个马大杂种相思（Acacia mangium×A. auriculiformis Cunn．ex Bench）无性系幼苗的生长状况发现，NO3- ：NH4+ 比例对马大相思生长及生物量的影响均达到极显著水平。在马大相思幼苗生长方面，当NO3- ：NH4+ 比例为25：75时，苗高净生长量最大，而NO3- ：NH4+ 比例为75：25时，根长净生长量最大，但抑制了苗高的生长；在生物量方面，当NO3- ：NH4+ 比例为25：75时，马大相思幼苗的生物量干重及生物量鲜重积累均达到最大。因此，在供氮总量不变的条件下，NO3- ：NH4+ 比例为25：75时最有利于马大杂种相思幼苗的生长。 |
| 关键词: 马大相思 NO3- ：NH4+ 比例 生长 生物量 |
| DOI： |
| 分类号: |
| 基金项目:国家“十一五”林业科技支撑计划：高产优质相思速生材新品种选育（2006BAD01A1505）； |
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| Effect of ratios between different forms of nitrogen on the seedling growth of Acacia mangium×A. auriculiformis Cunn．ex Bench |
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Zhao Ya-Lin
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| Abstract: |
| Abstract: The effect of nitrogen forms on the growth of Acacia mangium×A. auriculiformis Cunn．ex Bench young seedlings was studied with the method of water culture in greenhouse.The results were that the effect of different proportion of NO3- and NH4+ to the growth and the biomass of 9 clones had an extremly significant level. Under different forms of N，seedlings height net growth was the highest while the proportion of NO3- ：NH4+ was 25：75. While the proportion of NO3- ：NH4+ was 75：25，the root would have the highest net growth. In the fact of the biomass，when the proportion of NO3- ：NH4+ was 25：75，the seedlings’dry biomass and fresh biomass accumulation would be the highest. Therefore , under confession nitrogen all quantity is invariant condition, the young seedling grown best when the proportion of NO3- and NH4+ was 25：75. |
| Key words: Acacia mangium×A. auriculiformis Cunn．ex Bench the proportion of NO3- ：NH4+ growth biomass |
