Urbanization coupled with climate change results in significant stormwater management challenges. In this context, the use of green infrastructures such as bioswales and bioretention systems to intercept, slow down and filter runoff has been increasing in North America in recent years. However, little data is available on the selection of optimal plant species adapted to cold climates, their optimal positioning in the swale and intra and inter-seasonal variation in plant growth. A field experiment was conducted during three growing seasons from July 2020 to August 2022 in a proximal suburb of Québec City, Canada, to monitor the survival rate. Growth (height and plant area), and floridity (number of flower buds and flower stems) of 22 plant species in 48 cold climate bioretention cells located along streets. The study aimed to understand the influence of planting position (margin: upper position, usually dryer; slope; middle position, fluctuating water conditions; bottom: lower position, usually moister) on species development, in order to identify the species most and least adapted to the different moisture conditions. Results showed that survival was generally high (> 86%) and was not affected by position within the bioretention cells. However, for most species, plant area increased, and height decreased at the margin compared to the slope position, while floridity only increased at the margin for four species ( (L.) Sweet, L., Stella Supreme” L., L.). Seven species ( Jacq “Alba”, L., (L.) C. Presl, L., L. L., (L. Roth ex Mertens) exhibited lower survival and growth rates over time than the others. Overall, 15 out of 22 species performed well in the bioretention cells with minimum maintenance over the course of the experiment. Results also showed that plant area at the end of the growing season was much more influenced by position in the bioretention cells than were height or floridity, while survival was not influenced by this factor. A better knowledge of plant interactions in varying spatial distribution over time can contribute to improving and potentially maximizing bioretention performance.

中文翻译：

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寒冷气候下生物滞留细胞中植物的存活和生长

城市化加上气候变化导致雨水管理面临重大挑战。在此背景下，近年来北美越来越多地使用生物洼地和生物滞留系统等绿色基础设施来拦截、减缓和过滤径流。然而，关于适应寒冷气候的最佳植物品种的选择、它们在洼地中的最佳位置以及植物生长的季节内和季节间变化的数据很少。 2020年7月至2022年8月的三个生长季在加拿大魁北克市近郊进行了一项田间试验，以监测成活率。街道沿线 48 个寒冷气候生物保留室内 22 种植物的生长（高度和植物面积）和花度（花蕾和花茎的数量）。该研究旨在了解种植位置（边缘：上部位置，通常较干燥；斜坡；中间位置，水分波动情况；底部：下部位置，通常较潮湿）对物种发育的影响，以确定最适应和最不适应的物种适应不同的湿度条件。结果显示，存活率普遍较高（> 86%），并且不受生物滞留细胞内位置的影响。然而，对于大多数物种来说，与斜坡位置相比，边缘处的植物面积增加，高度降低，而有四个物种的花度仅在边缘处增加（（L.）Sweet，L.，Stella Supreme”L.，L. ）。 7 个物种（Jacq “Alba”, L., (L.) C. Presl, L., LL, (L. Roth ex Mertens) 随着时间的推移表现出比其他物种更低的存活率和生长率。总体而言，22 个物种中有 15 个物种在生物滞留细胞中表现良好，在整个实验过程中只需最少的维护。结果还表明，与高度或花度相比，生长季节结束时植物面积受生物滞留细胞位置的影响更大，而存活率不受影响随着时间的推移，更好地了解植物在不同空间分布中的相互作用有助于改善并可能最大限度地提高生物滞留性能。