遮荫处理对芍药幼苗生长和矿质营养积累的影响

遮荫是保护芍药幼苗生长的重要措施。本试验研究了不同遮荫处理对多伦芍药幼苗生长特性和矿质营养积累的影响,以便为多伦芍药幼苗栽培提供指导。采用盆栽试验,研究不遮荫(CK)、出苗一周后20%遮荫、40%遮荫、60%遮荫和80%遮荫5个处理的多伦芍药幼苗生长和矿质营养积累的变化。结果表明:与CK相比,遮荫处理显著提高了幼苗株高,增幅分别为19.9%、31.1%、52.9%、63.7%;显著降低了根生物量比和根冠比,降幅分别为21.5%、23.6%、29.2%、41.8%和40.6%、44.0%、50.9%、63.2%。40%遮荫、60%遮荫和80%遮荫显著提高了比叶面积,增幅分别为77.0%、84.1%、65.2%,显著增加了叶绿素和类胡萝卜素含量,增幅分别为92.3%、128.7%、98.1%和86.9%、113.1%、90.5%,显著降低了根生物量,降幅分别为61.4%、74.3%、78.6%。与CK、20%遮荫、40%遮荫和80%遮荫处理相比,60%遮荫显著提高了根中磷含量,增幅分别为245.7%、65.9%、40.5%、10.3%;60%遮荫处理的根中钾和镁含量显著高于其他处理,比CK、20%遮荫、40%遮荫和80%遮荫处理分别高102.9%、131.7%、57.0%、63.3%和131.3%、55.1%、40.4%、7.7%。本试验条件下,60%遮荫是多伦芍药幼苗生长适宜的光照条件。

Impacts of shading on seedling growth and mineral accumulation in Paeonia lactiflora

Shading is one of the important strategies to protect seedlings of Paeonia lactiflora. The effects of shading treatments on seedling growth and mineral accumulation of Duolun P. lactiflora were investigated in a greenhouse experiment to provide guidance for P. lactiflora cultivation. One week after emergence, seedlings were treated with 20%, 40%, 60% or 80% shading for two months, with no-shading as the control (CK). The results showed that shading treatments significantly increased plant height by 19.9%, 31.1%, 52.9%, and 63.7%, respectively. However, shading significantly reduced the root mass ratio and root to shoot ratio by 21.5%, 23.6%, 29.2%, 41.8% and 40.6%, 44.0%, 50.9%, 63.2%, respectively. Moreover, 40%, 60% and 80% shading significantly increased specific leaf area by 77.0%, 84.1% and 65.2%, and significantly increased chlorophyll content by 92.3%, 128.7%, 98.1%, and increased carotenoid content by 86.9%, 113.1% and 90.5%, respectively. The treatments of 40%, 60%, and 80% shading significantly decreased root biomass by 61.4%, 74.3% and 78.6%, respectively. Compared with CK, 20%, 40% and 80% shading, the 60% shading treatment increased root phosphorus content by 245.7%, 65.9%, 40.5% and 10.3%, increased potassium content by 102.9%, 131.7%, 57.0%, 63.3% and magnesium content by 131.3%, 55.1%, 40.4%, 7.7%, respectively. 60% shading was an appropriate shading intensity for P. lactiflora seedling cultivation based on local conditions in Duolun.