Milbau Ann, Nijs Ivan, Van Peer Liesbeth, Reheul Dirk, De Cauwer Benny
Research Group of Plant and Vegetation Ecology, Department of Biology, University of Antwerp, Universiteitsplein 1, B-2610 Wilrijk, Belgium.
Department of Plant Production, Faculty of Agricultural and Applied Biological Sciences, University of Ghent, Coupure Links 653, B-9000 Ghent, Belgium.
New Phytol. 2003 Sep;159(3):657-667. doi: 10.1046/j.1469-8137.2003.00833.x.
• An experiment with synthesized grassland communities was performed to identify plant traits that contribute to invasiveness and community traits that promote invasibility, and to study the relationship between, and the relative importance of, invasiveness and invasibility. • Eight perennial grass species were used both as invasible monocultures and as potential invaders in gaps in these monocultures. Invasion success in the establishment phase, and invader and monoculture traits were assessed. • Invasion success expressed as germination correlated significantly with germination time (invader trait), light penetration in the gaps and N acquisition by the edge plants (monoculture traits). Success expressed as leaf length correlated with seed mass, germination time (invader traits) and light penetration. Forty-six per cent of the variation in germination was explained by invader identity and 8% by monoculture identity, whereas, for leaf length, they explained 15% and 18%, respectively. • Regenerative traits (seed mass and germination time) correlated with invasiveness, and resource availability (light and nitrogen) with invasibility. The results suggest that species characteristics would largely determine the extent of an invasion event (number of seedlings), while the success of individual invaders (growth and survival) is determined by both species and ecosystem characteristics.
• 开展了一项关于人工合成草地群落的实验，以确定有助于入侵性的植物性状以及促进可入侵性的群落性状，并研究入侵性与可入侵性之间的关系及其相对重要性。
• 八种多年生草本植物既被用作可入侵的单一栽培植物，也被用作这些单一栽培植物间隙中的潜在入侵者。评估了建立阶段的入侵成功率以及入侵者和单一栽培植物的性状。
• 以发芽表示的入侵成功率与发芽时间（入侵者性状）、间隙中的光照穿透率以及边缘植物的氮素获取量（单一栽培植物性状）显著相关。以叶长表示的成功率与种子质量、发芽时间（入侵者性状）和光照穿透率相关。发芽变化的46% 由入侵者身份解释，8% 由单一栽培植物身份解释，而对于叶长，它们分别解释了15% 和18%。
• 再生性状（种子质量和发芽时间）与入侵性相关，资源可用性（光照和氮）与可入侵性相关。结果表明，物种特征在很大程度上决定入侵事件的程度（幼苗数量），而个体入侵者的成功（生长和存活）则由物种和生态系统特征共同决定。
