Department of Biology, Conservation Biology Group, Philipps-University Marburg, Marburg, Germany.
Plant Biol (Stuttg). 2012 Mar;14(2):257-64. doi: 10.1111/j.1438-8677.2011.00509.x. Epub 2011 Sep 20.
While several studies on regeneration in Salicaceae have focused on seedling recruitment, little is known about factors controlling their vegetative reproduction. In two greenhouse experiments, we studied the response of floodplain willows (Salix fragilis, S. viminalis, S. triandra) to competition with Poa trivialis, and to shoot and root removal when planted as vegetative cuttings. In the first experiment, growth performance variables were analysed in relation to full competition, shoot competition, root competition and control, taking into account two different water levels. After 9 weeks, shoots were removed and the resprouting capacity of the bare cuttings was recorded. In the second experiment, the cutting performance of the three floodplain and an additional two fen willow species (S. cinerea, S. aurita) was compared when grown in three different soil compositions and with two different water levels. After 9 weeks, shoot and root biomass was removed and the bare cuttings were replanted to test their ability to resprout. Cutting performance and secondary resprouting were negatively affected by full and shoot competition while root competition had no or weak effects. The floodplain species performed better than the fen species in all soil types and water levels. Secondary resprouting capacity was also higher in the floodplain species, which showed an additional strong positive response to the previous waterlogging treatment. The results contribute to understanding of the vegetative regeneration ecology of floodplain willows, and suggest that the use of vegetative plantings in restoration plantings could be an effective strategy for recovering floodplain forests.
虽然已有一些关于杨柳科植物再生的研究集中在幼苗的形成上，但对于控制其营养繁殖的因素却知之甚少。在两个温室实验中，我们研究了河边柳（Salix fragilis、S. viminalis、S. triandra）在与 Poa trivialis 竞争时的反应，以及作为营养插条种植时的茎和根去除后的反应。在第一个实验中，我们考虑了两个不同的水位，分析了与完全竞争、茎竞争、根竞争和对照相关的生长性能变量。9 周后，去除了芽，并记录了光秃插条的重新萌芽能力。在第二个实验中，当在三种不同的土壤组成和两种不同的水位下生长时，比较了三种河边柳和另外两种湿地柳（S. cinerea、S. aurita）的插条性能。9 周后，去除了茎和根生物量，并重新种植光秃插条以测试其重新萌芽的能力。完全竞争和茎竞争对插条性能和二次萌芽产生负面影响，而根竞争则没有或影响较弱。在所有土壤类型和水位下，河边柳种的表现都优于湿地柳种。二次萌芽能力在河边柳种中也更高，它们对之前的水淹处理表现出额外的强烈积极反应。研究结果有助于理解河边柳的营养繁殖生态学，并表明在恢复种植中使用营养植物种植可能是恢复洪泛森林的有效策略。
