摘要
采用砂培的方法研究酸性（pH值4．5）土壤下Fe^2＋对苜蓿生长和生理的影响。结果表明，土壤Fe^2＋含量在10～100mg／kg时苜蓿生长正常，出苗率、株高、单叶面积、单株叶片数、地上及地下生物量不低于对照组（pH值6，Fe^2＋10mg／kg）；在50mg／kgFe^2＋含量下，苜蓿生长受到促进，各指标均高于或显著（P〈0．05）高于其他处理；而Fe^2＋含量在100～200mg／kg时，幼苗的生长受到严重抑制，出苗率、株高、叶片长度、单株叶片数、根长和地上及地下生物量均显著低于（P〈0．05）其他处理；不同Fe^2＋含量下，苜蓿的叶片电导率、MDA含量、根系活力、可溶性糖含量，光化学效率（Fv／Fm）和光系统Ⅱ潜在活性（Fv／Fo）均存在显著差异，〈100mg／kgFe^2＋含量处理下的根系活力、光化学效率（Fv／Fm）和光系统Ⅱ潜在活性（Fv／Fo）显著高于100～200mg／kgFe^2＋处理，但叶绿素含量与铁离子浓度间并不存在显著的相关性。
The effects of Fe^2＋ in acid soil on seeding growth and physiological index of M. sativa were studied in sand culture. M. sativa grew very well at Fe^2＋ concentrations of 10-100 mg/kg. The morphological items measured were rate of germination, plant height, leaf area, number of leaves per plant, and weight of shoots and roots, no less than the control group （pH 6,Fe^2＋ 10 mg/kg）; Seedling growth was stimulated, and the physiological index of plants was higher, or significantly （P（0.05） higher than that of other treatments when the concentration of Fe^2＋ was less than 50 mg/kg. Concentrations of Fe^2＋ in the range 100-200 mg/kg soil resulted in a seriously restricted growth of M. sativa and there was a significant （P〈0.05） decrease in the measured morphological items. There were significant （P〈0.05） differences in electrolyte leakage, MDA content, root activity, soluble sugar content, Fv/Fo and Fv/Fm with different concentrations of Fe^2＋ ; When the concentration of Fe^2＋ was less than 100 mg/kg, the root activity, electrolyte leakage, Fv/Fo and Fv/F were significantly （P（0.05） higher than those in Fe^2＋ concentrations of 100-250 mg/kg. Chlorophyll content was not correlated with Fe^2＋ concentration.
出处
《草业学报》
CSCD
北大核心
2009年第5期10-17,共8页
Acta Prataculturae Sinica
基金
国家科技部"西北优势和特色牧草生产加工关键技术研究与示范"(2007BAD52B06)
"奶牛优质饲草生产技术研究及开发"(2006BAD04A04)
"优质抗逆专用草新品种选育"(2006BAD01A19)
农业部行业专项"人工草地优质牧草生产技术研究与示范"(nyhyzx07-022)
现代农业产业技术体系建设专项奖金资助
