甜瓜对不同形态氮素的吸收动力学研究  

Uptake Kinetics of Different Forms of Nitrogen by Muskmelon

作　　者：宋世威[1] 季凯莉[1] 葛体达[1] 黄丹枫[1] 

机构地区：[1]上海交通大学农业与生物学院,上海200240

出　　处：《土壤通报》2009年第3期590-593,共4页Chinese Journal of Soil Science

基　　金：国家863计划项目(2006AA10Z221);上海市"蔬菜学"重点学科建设项目(B209)

摘　　要：采用水培方法研究了甜瓜(Cucumis melo L.)对不同形态氮素(NO3-、NH4+和Gly)的吸收动力学特性,以及添加NH4+对NO3-吸收的影响。结果表明:甜瓜对不同形态氮素的吸收符合米氏方程,最大吸收速率(Vmax)和亲和力(1/Km)均表现为NO3->NH4+>Gly。NH4+的存在促进了甜瓜吸收NO3-的能力,在提高吸收速率的同时提高了离子亲和力。Uptake kinetics of different forms of nitrogen （NO3-, NH4＋ and Gly） by muskmelon （Cucumis melo L.）, also the effect of NH4＋ to NO3- uptake, were studied under hydroponics condition. The results indicated that uptake kinetics of different forms of nitrogen by muskmelon accorded with Michaelis-Menten equation. Both the maximum uptake rate （Vmax） and the affinity （1/Kin） followed the tendency NO3-〉 NH4＋ 〉 Gly. NH4＋ improved the uptake ability of NO3- by muskmelon, with enhancing both the uptake rate and the affinity with the uptake site.

关 键 词：甜瓜 氮素 氨基酸 吸收动力学 

分 类 号：S652[农业科学—果树学]