不同磷水平土壤接种丛枝菌根真菌对植物生长和养分吸收的影响  

Influences of arbuscular mycorrhizal fungi(AMF)on the growth and ecological stoichiometry of clover and ryegrass grown in monoculture or in mixture at different phosphorus(P)levels

作　　者：陈梅梅[1] 陈保冬[1] 王新军[1] 朱永官[1] 王幼珊 

机构地区：[1]中国科学院生态环境研究中心,北京100085 [2]北京市农林科学院植物营养与资源研究所,北京100089

出　　处：《生态学报》2009年第4期1980-1986,共7页Acta Ecologica Sinica

基　　金：国家自然科学基金委创新群体资助项目(40621061);国家重点基础研究发展计划资助项目(2005CB121105)

摘　　要：通过盆栽试验研究了不同磷水平土壤接种丛枝菌根真菌Glomus mosseae对三叶草(Clover)和黑麦草(Ryegrass)生长、P浓度及N∶P比的影响。试验结果表明,Glomus mosseae显著提高了三叶草中P浓度和生物量,降低了植株N∶P比,对黑麦草植株P含量、生物量及N∶P比没有显著影响;在不同磷水平土壤中,接种处理对单种时三叶草中P含量的影响程度不同,以中磷和高磷水平下的影响较显著,这表明Glomus mosseae对三叶草的菌根效应在不同磷水平下并不相同;另外,两种植物混合种植情况下,黑麦草的竞争能力高于三叶草,使得其P浓度和生物量都显著高于三叶草,而接种Glomus mosseae增加了混种中三叶草的生物量和P浓度,降低了黑麦草的生物量,表明Glomus mosseae能提高混种中三叶草的竞争能力,从而改变群落中物种的竞争关系。此外,在一定磷水平下,菌根真菌的存在降低了三叶草中N∶P比,这会改变三叶草的受限制方式,由受P元素限制变为受N元素限制。A pot experiment was conducted to investigate the effects of AMF on the growth,P concentrations and N∶P ratios of clover and ryegrass grown in monoculture or in mixture at different P levels.The results showed that：（1）the inoculation with Glomus mosseae significantly increased dry mass and P concentration,decrease N∶P ratio of clover,while had no significant influences on those of ryegrass;（2）at different P levels,AMF had a more significant influence on P concentration of clover grown singly in soil with medium or high P than that in soil with low P,suggesting that Glomus mosseae had a different effect on P concentration of clover at different P levels;（3）ryegrass showed competitive advantages against clover in mixture,thus,ryegrass in mixture had a higher P concentration and dry mass than clover,however,the inoculation with Glomus mosseae enhanced dry mass and P concentration of clover,while decreased dry mass of ryegrass in mixture culture,which indicated that root colonization can improve the competitiveness of clover in mixture,and affected plant community structure.In addition,the colonization of Glomus mosseae also reduced N∶P ratio of clover,this can lead to the shift in limitation from P to N nutrient.

关 键 词：丛枝菌根真菌Glomus mosseae 磷 三叶草 黑麦草 N∶P比 

分 类 号：S154[农业科学—土壤学]