摘要
采用盆栽控制实验方法,以松嫩草地的优势种——羊草和主要伴生种——虎尾草为对象,研究了盐碱胁迫下丛枝菌根真菌(arbuscular mycorrhizal fungi,AM真菌)对两者种间相互作用的影响.结果表明:AM真菌侵染显著降低了羊草和虎尾草的生物量,而且对实验中优势种虎尾草的负影响大于对劣势种羊草的影响;种间竞争关系显著抑制了羊草的生长,但是对虎尾草的生物量影响不显著;盐碱胁迫条件下,AM真菌能够通过增加对优势种虎尾草的抑制效应促进两物种的共存.AM真菌对于草地生态系统中植物种间关系和物种共存具有重要的调节作用.
Mycorrhiza, a symbiosis formed between higher plants and soil fungi, has important ecosystem function in the regulation of inter-specific competition and the maintenance of ecosystem functions such as plant composition, community structure and diversity. To study the effect of arbuscular mycorrhizal fungi （AM fungi） on the inter-specific interaction between the dominant species （Leyrnus chinensis） and its main companion species （Chloris virgata） under soil salinity- alkalinity stress, a controlled pot experiment was carried out on the campus of Northeast Normal University. Biomass of L. chinensis and C. virgata was reduced significantly by the colonization of AM fungi,and the negative effect of AM fungi on the dominant species C. virgata was greater than on the subordinate specie L. chinensis in this study. The growth of L. chinensis was significantly inhibited by inter-specific competitive interaction. However,the biomass of C. virgata was not influenced by inter- specific competition. Moreover,AM fungi could improve the coexistence of L. chinensis and C. virgata by reducing the dominance of C. virgata under soil salinity-alkalinity stress condition. Therefore,AM fungi might play an important role in regulating the inter-specific interaction and coexistence.
出处
《东北师大学报（自然科学版）》
CAS
CSCD
北大核心
2014年第1期124-129,共6页
Journal of Northeast Normal University(Natural Science Edition)
基金
国家自然科学基金资助项目(30900184)
教育部博士点基金资助项目(20090043120010)
吉林省科技发展计划青年科研基金资助项目(20130522065JH)
关键词
丛枝菌根真菌
种间竞争
盐碱胁迫
羊草
虎尾草
共生
arbuscular mycorrhizal fungi
inter-specific competition
soil salinity-alkalinity stress
Leymus chinensis
Chloris virgata
coexistence
