Alien plant invasions of riparian zones can trigger bottom-up effects on freshwater ecosystems through changes in leaf litter supply. Riparian zones of ponds are often invaded by alien species, and although these habitats are common, the effect of invasive alien species on ponds has rarely been studied. We performed a leaf litter experiment in a pond and compared within- and between-species variation in the breakdown rates of three native species (Alnus glutinosa, Phragmites australis and Typha angustifolia) and two aggressive alien invaders of riparian zones (Fallopia japonica and Solidago canadensis). The litter of S. canadensis decomposed faster than the litter of the other plants; more than 50 % of the S. canadensis biomass decomposed within a week. This contradicts the home-field advantage hypothesis, and we argue that the quality rather than the origin of litter might be the key factor driving breakdown rates. We also reported considerable intra-specific variation; old leaves (collected in spring after a partial aerial breakdown on stems) decomposed two to seven times slower than senescent leaves (collected in autumn just after abscission). The continuous seasonal supply of leaves of different quality into freshwaters may be disrupted by terrestrial invasions, especially if an invader forms monoculture stands and produces a highly palatable litter, as is the case with S. canadensis. This may fundamentally alter the resource dynamics in the pond environment through a rapid depletion of litter mass before the next litterfall.

外来植物入侵河岸带可以通过落叶物供应的变化触发对淡水生态系统的自下而上的影响。池塘的河岸带经常被外来物种入侵，虽然这些栖息地很常见，但很少研究外来入侵物种对池塘的影响。我们在池塘中进行了落叶试验，比较了三种本地物种（桤木、芦苇和香蒲）和河岸地区的两种侵略性外来入侵者（粳稻和加拿大一枝黄花）的分解率的种内和种间差异。）。S. canadensis的垃圾比其他植物的凋落物分解得更快；超过 50% 的加拿大 S.canadensis生物质在一周内分解。这与主场优势假设相矛盾，我们认为垃圾的质量而不是来源可能是推动故障率的关键因素。我们还报告了相当大的种内变异；老叶（在茎上部分空气分解后在春季收集）比衰老叶（在秋季刚脱落后收集）慢 2 到 7 倍。不同质量的叶子进入淡水的连续季节性供应可能会受到陆地入侵的干扰，特别是如果入侵者形成单一栽培林分并产生非常可口的枯枝落叶，如加拿大 S. canadensis的情况。 这可能会通过在下一次凋落物之前迅速消耗凋落物质量，从根本上改变池塘环境中的资源动态。