物种多样性对豆科牧草功能特征的影响  

Effects of species diversity on functional trait of legume forage

作　　者：张灵菲[1] 魏斌[1] 郝敏[1] 葛庆征[1] 傅华[1] 张卫国[1] 江小雷[1] 

机构地区：[1]兰州大学草地农业科技学院,甘肃兰州730020

出　　处：《草业科学》2012年第1期25-29,共5页Pratacultural Science

基　　金：国家自然科学基金项目(30770333);国家科技支撑计划(2009BAC53B04;2008BAD95B03)

摘　　要：利用室外盆栽实验方法就物种多样性对豆科牧草功能特征及生产力的影响进行了研究。结果表明,物种多样性对豆科牧草比叶面积、株高有促进作用,二者呈显著正相关关系;对相对生长率、根深、叶干物质含量和单位叶面积根量4个功能特征有负面影响,4个变量均随物种多样性的增加而显著下降(P<0.05)。豆科牧草的地上、地下生产力都随着物种多样性的增加而下降。研究结果说明,随着物种多样性的增加,种间竞争作用导致豆科牧草的比叶面积和株高增加,而导致相对生长率、根深、叶干物质含量和单位叶面积根量4个与生产力密切相关的功能特征值减小,进而限制混播群落中豆科牧草的生产力。A pot experiment was used to determine the effects of species diversity on functional traits of legume forages by measuring the relative growth rate, specific leaf area, leaf dry mass content, plant height, root depth and root mass per unit leaf area, and productivity. The results of this study indicated that the species diversity had a positive effect on specific leaf area and plant height, and a negative effect on relative growth rate, root depth, leaf dry mass content, and root mass per unit leaf area. The productivity, aboveground and belowground biomass of legume forage decreased as the species diversity increased. These results suggested that the increasing interspecific competition caused by the increase of species diversity increased the specific leaf area and plant height, but restricted other four functional traits and the productivity of legume forages.

关 键 词：豆科牧草 功能特征 物种多样性 生产力 

分 类 号：S54[农业科学—作物学]