| 不同铵硝配比对香蕉幼苗硝态氮吸收动力学特征影响 |
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| 引用本文： | 王岚,王伟,黄承和,常春荣.不同铵硝配比对香蕉幼苗硝态氮吸收动力学特征影响[J].热带作物学报,2012,33(6):988-992. |
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| 作者姓名： | 王岚 王伟 黄承和 常春荣 |
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| 作者单位： | 海南大学农学院,海南海口,570228 |
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| 基金项目： | 海南省自然基金项目（水稻硅与氮、磷、钾营养相关关键基因分子调控机制，310028）；海南大学科研项目（hd09xm61）与作物学省重点学科资助。 |
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| 摘 要： | 将香蕉苗移植到0.2 mmol/L CaSO4溶液中饥饿3d,采用改进耗竭法研究了香蕉幼苗期在5种铵硝配比营养液中的硝态氮的吸收动力学特征,以探讨香蕉铵硝营养特点.结果表明,香蕉幼苗所有铵硝配比处理的硝态氮吸收曲线特征均符合Michaelis-Menten酶动力学模型的描述.加铵不仅显著影响香蕉幼苗硝态氮吸收动力学参数Vax,对Km的影响也达显著水平.在霍格兰营养液的基础上直接添加10％NH4+-N比将10％NO3-N用NIH4+-N替换更能降低香蕉对硝态氮的吸收速率,但这两种处理对Km的影响不显著.在100％硝态氮的基础上,增铵降低了香蕉对硝态氮的吸收速率,增10％NH4+-N降低香蕉对硝态氮的亲和力,增25％ NH+4-N对香蕉对硝态氮的亲和力的影响则相反.在本实验条件下,香蕉硝态氮吸收系统属于低亲和吸收系统.
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| 关 键 词： | 香蕉 增铵 硝态氮 吸收动力学 |
Effect of Nitrate Uptake Kinetic with Different Ratios of Ammonium and Nitrate in Banana Seedlings |
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| WANG Lan,WANG Wei,HUANG Chenghe and CHANG Chunrong.Effect of Nitrate Uptake Kinetic with Different Ratios of Ammonium and Nitrate in Banana Seedlings[J].Chinese Journal of Tropical Crops,2012,33(6):988-992. |
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| Authors: | WANG Lan WANG Wei HUANG Chenghe and CHANG Chunrong |
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| Institution: | College of Agriculture, Hainan University;College of Agriculture, Hainan University;College of Agriculture, Hainan University;College of Agriculture, Hainan University |
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| Abstract: | The characteristics of nitrate uptake kinetic in the solution of five ratios of ammonium and nitrate by modified depleting way treated with 0.2 mmol/L CaSO4 solution for three days were studied to discover the ammonium and nitrate nutrition properties of banana seedlings. The result showed that the nitrate uptake kinetic characteristics of all treatments with five ratios of ammonium and nitrate followed the enzyme kinetic model of Michaelis-Menten. Increasing ammonium ratio remarkably influenced Vmax and Km; Vmax would be reduced more to the Hoagland solution adding 10% ammonium than that in placement of 10% ammonium with 10% nitrate, although Km had no distinct difference between these two treatments. The nitrate uptake rate would be reduced in soil of 100% nitrate treated with increasing ammonium ratios. The nitrate affinity. would be decreased treated with 10% more ammonium, while that for the 25% ammonium treatment was in the opposite direction. The nitrate uptake for banana seedlings belonged to low affinity system. |
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| Keywords: | Banana seedling Increasing ammonium Nitrate Uptake kinetic |
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