Jerbi Ahmed, Laur Joan, Lajoie Kevin, Gallant Pierre-Paul, Barnabé Simon, Pitre Frederic E, Labrecque Michel
Institut de recherche en biologie végétale, Université de Montréal, Montréal, QC, Canada.
Montreal Botanical Garden, Research and Development Division, Montréal, QC, Canada.
Front Plant Sci. 2023 Mar 2;14:1087035. doi: 10.3389/fpls.2023.1087035. eCollection 2023.
Traditional treatment of wastewaters is a burden for local governments. Using short rotation coppice willow (SRCW) as vegetal filter has several environmental and economic benefits. Here, we investigated the effect of primary wastewater irrigation on wood structure and composition of the willow cultivar 'SX67' following two years of growth. Compared to unirrigated plants (UI), stem sections of plants irrigated with primary wastewater (WWD) showed an unexpected decrease of hydraulic conductance (K) associated with a decrease in vessel density but not vessel diameter. The majority (86%) of vessels had diameters range groups [20-30[, [30-40[and [40-50[µm and contributed to > 75% of theoretical K, while the group class [50-60[µm (less than 10% of vessels) still accounted for > 20% of total K regardless irrigation treatments. WWD significantly alters the chemical composition of wood with an increase of glucan content by 9 to 16.4% and a decrease of extractives by 35.3 to 36.4% when compared to UI or to plants irrigated with potable water (PW). The fertigation did also increase the proportion of the tension wood which highly correlated with glucan content. In the context of energetic transition and mitigation of climate change, such results are of high interest since WWD effectively permit the phytofiltration of large amounts of organic contaminated effluents without impairing SRCW physiology.
传统的废水处理对地方政府来说是一项负担。使用短轮伐期矮林柳树（SRCW）作为植物过滤器具有若干环境和经济效益。在此，我们研究了原废水灌溉对柳树品种‘SX67’生长两年后的木材结构和组成的影响。与未灌溉的植株（UI）相比，用原废水灌溉的植株（WWD）的茎段显示出导水率（K）意外下降，这与导管密度降低有关，但与导管直径无关。大多数（86%）导管的直径范围分组为[20 - 30[、[30 - 40[和[40 - 50[微米，对理论K的贡献率超过75%，而[50 - 60[微米组（导管占比不到10%）无论灌溉处理如何，仍占总K的20%以上。与UI或用饮用水（PW）灌溉的植株相比，WWD显著改变了木材的化学成分，葡聚糖含量增加了9%至16.4%，提取物减少了35.3%至36.4%。施肥也增加了应拉木的比例，应拉木与葡聚糖含量高度相关。在能源转型和缓解气候变化的背景下，这些结果非常有意义，因为WWD能够有效地对大量有机污染废水进行植物过滤，而不会损害SRCW的生理机能。
