Functional trait values and trait responsiveness to different environmental regimes determine the growth and reproduction of wetland plants. Flooding depth and nitrogen (N) supply, which have strong effects on plant functional traits, are important factors affecting the growth of marsh plant species. A greenhouse experiment was conducted to examine the response of growth, clonal reproductive traits, biomass accumulation and allocation of Glyceria spiculosa to changes in flooding depth 0, +5 and +15 cm relative to the soil surface and N supply (0, 12, 20 and 28 mM N, added as urea [CH₄N₂O]). We found that flooding depth and N supply interactively affected grow, reproduction and biomass cumulation of G. spiculosa. N supply increased plant height (H), leaf area (LA) and above-ground biomass (AGB) and has no effect on leaf dry matter content (LDMC) and root length (RoL) in control treatment, and decreased LDMC and RoL and has no effect on H, LA and AGB in flooding treatment. N supply enhanced ramet number in control and shallow flooding treatment (+5 cm) and had no effect on that in deep flooding depth (+15 cm). Flooding depth has a positive and negative effect on belowground biomass (BGB) and the ratio of belowground to aboveground biomass (BAR), respectively. N supply has a positive effect on rhizome biomass and BGB and a negative effect on BAR. These findings contribute to our understanding of the roles of functional traits in response to habitat changes and of future distribution pattern for G. spiculosa.

功能性状值和对不同环境状况的性状响应决定了湿地植物的生长和繁殖。淹水深度和氮（N）供应对植物功能性状有很强的影响，是影响沼泽植物物种生长的重要因素。进行了一项温室试验，以检查Glyceria spiculosa的生长、克隆繁殖性状、生物量积累和分配对相对于土壤表面和 N 供应（0、12、20和 28 mM N，以尿素 [CH ₄ N ₂ O] 形式添加）。我们发现淹水深度和 N 供应交互影响G. spiculosa 的生长、繁殖和生物量积累. 施氮增加了对照处理的株高（H）、叶面积（LA）和地上生物量（AGB），对叶片干物质含量（LDMC）和根长（RoL）没有影响，降低了LDMC和RoL和水浸处理对H、LA、AGB无影响。施氮增加了控制和浅水处理（+5 cm）的分株数，而对深水深度（+15 cm）的分株数没有影响。洪水深度分别对地下生物量 (BGB) 和地下与地上生物量之比 (BAR) 产生正面和负面影响。氮供应对根茎生物量和 BGB 有积极影响，对 BAR 有消极影响。这些发现有助于我们了解功能性状在响应栖息地变化和G. spiculosa未来分布模式中的作用。