Research Advance on Allelopathy of Plant in Grassland Ecosystem

Allelopathy of plant becomes one of hot topics in the field of plant chemical ecosystem.Chemical substances are released in environment via some processes,such as leaching,volatilization,residue decomposition and root exudation,producing interactions between plant species or in one species,which are positive or negative on surrounding plants and microorganisms.Allelopathy actions affect the community composition,distribution pattern,succession,the preservation and germination of seeds and the process of nitrogen circulation.The study mainly focused on the types,function characteristics,release ways,extract methods of allelochemical as well as the influence factors of production.It also proposed some scientific problems and application prospect in study on allelopathy of grassland plant.