氮素营养条件对菜心吸收矿质养分的影响及其与硝酸盐累积的关系  

Effects of Supplied Nitrogen Form on Nutrient Absorption and Nitrate Acc umulation in Flowering Chinese Cabbage

作　　者：艾绍英[1] 王美丽[1] 姚建武[1] 黄小红[1] 蔡永发[1] 

机构地区：[1]广东省农业科学院土壤肥料研究所,广东广州510640

出　　处：《农业环境科学学报》2003年第5期578-581,共4页Journal of Agro-Environment Science

基　　金：广东省自然科学基金资助项目(000152)

摘　　要：采用水培试验,研究了不同氮形态供应条件下菜心吸收矿质养分以及与硝酸盐累积的关系。结果表明,当营养液中只含硝态氮源时,菜心吸收钾和氯的量与硝酸盐累积量呈间接的负相关关系;当营养液中硝铵态氮的比例为7∶3时,磷、钾、钙、镁、硫、氯、钼的吸收均间接地与硝酸盐累积有负相关关系,进一步的分析表明,在这种氮素营养条件下,磷主要是通过改变它与全氮的吸收比例而影响硝酸盐的累积,而其他元素则主要是改变了它们与硝态氮的吸收比例而影响硝酸盐的累积。说明根据不同氮素营养条件下矿质养分吸收与硝酸盐累积的关系,针对性地采取营养调节措施,以达到降低硝酸盐的目的是可行的。Asolution culture experiment was conducted for studying effect of nitr ogen formon nutrient absorption in f lowering Chinese cabbage and related to nitrate accum ulation.It was indicated that the ab sorption of K and Cl were the main infl uence factor in nitrate accumulation when onlyNO 3- -Nwas available in the nutrient solu tion.When ratio ofNO 3- -NandNH 4+ -Nwas 7∶3in the nutrient solution,the absorption of P,K,Ca,Mg,S,Cl,Mo all influence nitrate ac cumulation in flowering Chinese cab bage,resulting in ratios of K,Ca,Mg,S,Cl,Mo toNO 3- -Nand P to total Nin this nitrogen nut rition condition as a major characte rs.It was possible to reduce nitrate content by nutrition regulation measure according to t he relations of nutrients absorptio n and nitrate accumulation in the different nitrogen form supplie d.

关 键 词：氮素 营养条件 菜心 营养吸收 矿质养分 影响因素 硝酸盐累积 水培试验 

分 类 号：S636[农业科学—蔬菜学]