Clonal plants can reproduce both sexually and asexually. Selection of reproductive strategies is crucial for the evolution of clonal plants. Nevertheless, little is known about the reproductive strategy of clonal aquatic plants in diverse environments and at different harvest times. In this study, the reproduction of the clonal aquatic plant species Leersia oryzoides (L.) Swartz. was investigated under two different submergence conditions: mesic and flooding in two different years. We collected data concerning specific leaf area (SLA), a growth-related trait, during the growing season in both years. Seed output (total seed mass, seed number and seed mass) and rhizome mass, which reflect sexual reproduction and asexual reproduction, respectively, were measured in the reproductive period. The correlation between sexual reproduction (total seed mass) and asexual propagation (rhizome mass) was subsequently analyzed. The correlations between SLA and each reproductive output—total seed mass and rhizome mass—were explored. Seed output (the seed number and total seed mass) decreased in the second-year harvest (H2) compared to the first-year harvest (H1). Greater seed mass was observed at H2 than at H1 in the flooding treatment. The ratio of sexual to asexual reproductive output increased under flooding and decreased at H2. Generally, the SLA and rhizome mass were not significantly correlated, while a significant negative correlation was detected between SLA and total seed mass across all observations. A nonsignificant correlation between rhizome mass and total seed mass was also detected. A decrease in sexual reproduction can occur over time, although disturbances such as flooding can promote the allocation of reproduction resources to the sexual approach. Leaf functional traits such as SLA may negatively predict the output of sexual reproduction, and the trade-off between SLA and asexual propagation is likely nonexistent. A trade-off between asexual reproduction and sexual reproduction does not exist for L. oryzoides.

克隆植物可以有性和无性繁殖。生殖策略的选择对于克隆植物的进化至关重要。然而，关于克隆水生植物在不同环境和不同收获时间的繁殖策略知之甚少。在这项研究中，无性系水生植物米草Leersia oryzoides的繁殖（L.）Swartz。在两个不同的淹没条件下进行了调查：在两个不同的年份发生了中度和洪水。在这两年的生长季节中，我们收集了有关特定叶面积（SLA）（一种与生长相关的性状）的数据。在生殖期测量分别反映有性生殖和无性生殖的种子产量（总种子质量，种子数量和种子质量）和根茎质量。随后分析了有性生殖（种子总数）与无性繁殖（根茎质量）之间的相关性。探索了SLA与每个生殖输出（种子总质量和根茎质量）之间的相关性。与第一年收获（H1）相比，第二年收获（H2）的种子产量（种子数量和总种子质量）下降。在淹水处理中，H2处的种子质量大于H1处。在洪水期间，有性生殖与无性生殖产出的比率增加，在H2时减少。通常，SLA与根茎质量无显着相关性，而在所有观察结果中，SLA与总种子质量之间均呈显着负相关。根茎质量和总种子质量之间也没有显着相关性。尽管随着洪水泛滥等干扰会促使生殖资源分配给性方法，但随着时间的流逝，性生殖可能会减少。叶片功能特征（例如SLA）可能会对性繁殖的输出产生负面影响，并且SLA和无性繁殖之间的权衡可能不存在。L. oryzoides。