环境酸度对紫花苜蓿早期生长和生理的影响

草业学报 ›› 2010, Vol. 19 ›› Issue (2): 47-54.

环境酸度对紫花苜蓿早期生长和生理的影响

李剑峰^1,2,师尚礼^1,2*,张淑卿^1,2

1.甘肃农业大学草业学院,甘肃兰州 730070;
2.草业生态系统教育部重点实验室中-美草地畜牧业可持续发展研究中心,甘肃兰州 730070

收稿日期:2009-02-27 出版日期:2010-02-25 发布日期:2010-04-20
作者简介:李剑峰(1979-),男,甘肃天水人,博士。 E-mail ljfsmart@qq.com
基金资助:
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)和现代农业产业技术体系建设专项资金资助

Effects of the pH value of an acid environment on early growthand physiology of Medicago sativa W525

LI Jian-feng^1,2, SHI Shang-li^1,2, ZHANG Shu-qing^1,2

1.College of Grassland Science, Gansu Agricultural University, Lanzhou 730070, China;

2.Key Laboratory of Grassland Ecosystem of Ministry of Education/Sino-U.S.
Centers for Grazing land Ecosystem Sustainability, Lanzhou 730070, China

Received:2009-02-27 Online:2010-02-25 Published:2010-04-20

摘要/Abstract

摘要： 采用沙培的方式研究酸性土壤中土壤酸度对紫花苜蓿生理和生长的影响。结果表明,pH值在5～6的弱酸性环境为苜蓿的最适生长环境,这一酸度范围内幼苗生长正常或受到促进,如单株叶片数高于对照(pH=7)处理23.6%～27.2%、单叶面积高出对照20.87%～25.50%,叶绿素含量高出对照31.2%～27.9%,差异均达显著水平(P<0.05)。而出苗率、株高、根瘤数、根瘤等级、根长和地上、地下生物量亦高于对照;而pH值低于4的环境酸度为低适生长环境,可使苜蓿幼苗受到严重胁迫,出苗率、株高、单叶面积、单株叶片数、根瘤数、根长和地上、地下生物量均低于其他处理。在不同土壤酸度下,质膜透性、叶绿素含量、光化学效率(Fv/Fo)等均存着显著差异(P<0.05),pH＜4的各项生理指标均明显低于pH≥5的处理,其中地上生物量和根系活力分别不足对照处理的55.6%和61.1%(P<0.05)。

Abstract: The effects of an acid environment in acid soil on seeding growth and physiological index of Medicago sativa were studied by sand culture. The alfalfa grew very well in an acid environment of pH 5 to 6, The numbers of leaves, leaf area, and chlorophyll content per plant were significantly higher (23.6%-27.2%, 20.87%-25.5%, 31.2%-27.9%, respectively ) than those of the control (pH=7). Other morphological features, including rate of germination, height of plant, biomass, number and quality of nodules were not less than in the control (pH=7) and were sometimes increased. Alfalfa growth was seriously restricted when the environmental pH was lower than 4. There was a significant (P<0.05) reduction in the morphological features measured, including rate of germination, height of plant, leaf area, number of leaves per plant, biomass, root length, number and quality of nodules which were significantly (P<0.05) reduced compared with the control group . There were significant (P<0.05) differences in electrolyte leakage, chlorophyll content, Fv/Fo and Fv/Fm under environments with different pH values. All physiological and morphological indexes were significantly (P<0.05) reduced in the weak acid treatment group (pH≥5) compared with the acid treatment group (pH≤4), with above-ground biomass and root activity 55.6% and 61.1% of the control respectively.

中图分类号:

李剑峰,师尚礼,张淑卿. 环境酸度对紫花苜蓿早期生长和生理的影响[J]. 草业学报, 2010, 19(2): 47-54.

LI Jian-feng, SHI Shang-li, ZHANG Shu-qing. Effects of the pH value of an acid environment on early growthand physiology of Medicago sativa W525[J]. Acta Prataculturae Sinica, 2010, 19(2): 47-54.

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