化感作用与资源竞争对假臭草入侵的影响

化感作用和资源竞争是植物之间普遍存在的一种种间相互作用,也是入侵植物成功入侵的重要"武器"。假臭草的成功入侵除了与其他植物争夺资源外,还通过化感作用抑制其他植物的生长。本研究以假臭草为供体,热研2号柱花草为受体,以植物的化感作用和资源竞争为切入点,应用化感-竞争分离法构建共生群落研究化感作用和资源竞争。结果表明,地上竞争对假臭草入侵的促进作用达到20%以上,而地上化感作用、地下化感和地下竞争对假臭草入侵的影响不明显。地上竞争促进假臭草成功入侵,地上化感作用、地下化感作用和地下竞争可能在入侵后期才发挥作用。

Effect of Allelopathy and Resource Competition on Eupatorium catarium Invasion

Allelopathy and resource competition is widely existed in all plants for interspecific interaction and it is also the important weapon for plants successful invasion. The successful invasion of Eupatorium catarium resulted in resource competition and aUelapathic inhibiting of other plants growth. As the starting point of the plant allelopathy and resource competition, this study regarded Eupatorium catarium as the donor, Stylosanthes guianensis cv. Reyan No. 2 as the recep- tor to build a symbiotic community for research of allelopathy and resource competition via an allelopathic - competitive separation method. The result showed that the active role of aboveground resources competition in Eupatorium catarium invasion was more than 20%, while the effect of the aboveground allelopathy, underground allelopathy and underground competition on Eupatorium catarium invasion was not obvious. Aboveground competition seems to be successful to pro- mote Eupatorium catarium invasion. Aboveground allelopathy, underground allelopathy and underground competition might be available to play a role during the later period of invasion.