局部根区水氮耦合对玉米幼苗养分吸收利用的影响  

Interactive effects of water and nitrogen supply on nutrient absorption and utilization of maize seedlings under partial root-zone water stress

作　　者：王旭明[1] 张铮[1] 王海红[1] 祝鹏飞[1] 王馨[1] 束良佐[1] 

机构地区：[1]淮北师范大学生命科学学院,资源植物生物学安徽省重点实验室,安徽淮北235000

出　　处：《干旱地区农业研究》2010年第3期107-113,共7页Agricultural Research in the Arid Areas

基　　金：国家自然科学基金项目(30771286);资源植物生物学安徽省重点实验室项目(KLPRB200901)

摘　　要：研究局部根区水分胁迫下不同氮形态与供应部位对玉米幼苗养分吸收利用的影响。氮设三种形态(50%NO3--N+50%NH4+-N;NO3--N;NH4+-N)。采用分根培养的方法,用聚乙二醇(PEG6000)模拟水分胁迫。PEG和氮只加入到分根装置的一侧根室,形成局部根区水分胁迫下水氮同区、水氮异区六个处理。收获时测玉米幼苗植株生物量和各养分浓度。结果表明,水氮同区比水氮异区更利于玉米幼苗生长,氮、磷、钾、钙、镁、铁总含量和增量都高于相应氮形态的水氮异区处理。不同氮形态相比,混合氮有利于促进玉米幼苗生长和增强氮的吸收能力;相对于铵态氮,硝态氮促进了钾、钙、镁、铁总量和增量的增加;养分利用效率基本上与其地上部分该养分浓度的高低呈负相关。Effects of nitrogen form and its application position on nutrient absorption and utilization of maize seedlings under partial root-zone water stress were examined by using solution culture technique.A splitroot system composed of two root compartments was used.Polyethylene glycol（PEG6000） was added to one root compartment simulating partial root-zone water stress.Nitrogen was set as three forms（50% NO3——N＋50% NH4＋-N;NO3-N;NH4＋-N） and supplied to just one root compartment（water-stressed or non-water-stressed-compartment）.Plant biomass and nutrient concentration were examined when plants were harvested.It showed that,plant growth,total content and increment of N,P,K,Ca,Mg,Fe in plants were improved when nitrogen was supplied to non-water-stressed compartment compared to water-stressed one.Comparing to other nitrogen form,the growth and nitrogen absorption by plants treated with mixed nitrogen were the highest.Supply of nitrate increased absorption and increment of K,Ca,Mg and Fe compared to ammonium nutrition.Nutrient use efficiency was oppositely correlated to its concentration in shoot in most case.

关 键 词：局部根区水分胁迫 氮形态 供氮部位 养分利用 玉米幼苗 

分 类 号：Q945.78[生物学—植物学]