不同供氮水平下加拿大一枝黄花的化感作用与资源竞争分析

为探讨加拿大一枝黄花在入侵过程中的化感作用与资源竞争之间的关系，采用化感-竞争分离法，分析了加拿大一枝黄花在入侵过程中其化感作用与资源竞争及在不同氮水平下的反应特性。结果表明，外来入侵杂草加拿大一枝黄花具有较强的生物干扰能力，在不同氮素水平下，其资源竞争能力较强且表现稳定，但化感作用潜力则随供氮水平的下降而明显增强，土著植物一枝黄花不具化感作用潜力，在供氮水平充足下，其资源竞争能力减弱，但氮胁迫下却明显增强，这被认为是在环境资源匮乏时生态位之间竞争加剧的结果。

Solidago canadensis L. allelopathy and resource competitiveness under different nitrogen supply

To find the relationship between Solidago canadensis L. allelopathy and resource competitiveness in the process of invasion, allelopathy and competition separation-based bioassay (ACS) approach was used to analyze S. canadensis L. response under different nitrogen supply. The results show that the invasive plant S. canadensis L. has a high ability to interfere with target wheat plant. It is highly stable and very competitive, and its allelopathic potential increases with decreasing nitrogen supply in co cultured systems. The reverse is true for the native species of S. decurrens Lour., which has a lower allelopathic potential at all nitrogen supply levels and a low resource competitiveness under normal to rich nitrogen supply. However, S. decurrens Lour. has a remarkably high ability to compete for resources under low nitrogen supply, believed to be induced by co-culture system competition.