Linking nutrient dynamics and phenology in Lupinus polyphyllus to identify the right timing for population control

IF 3 2区 环境科学与生态学 Q2 ECOLOGY
Elin L. Blomqvist , Yves P. Klinger , Till Kleinebecker , R. Lutz Eckstein
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Abstract

In light of the decline of semi-natural grasslands, road verges have become important refuges for grassland plants, benefiting from the management regimes that resemble those of traditional grasslands. However, the value of road verges for grassland plants is threatened by the presence of invasive alien plant species such as Lupinus polyphyllus. Mowing is most effective for controlling invasive plants when the shoot:root ratio is high or when below-ground reserves are exhausted but seeds have not yet matured. The aim of this study was to identify the optimal time for mowing of L. polyphyllus based on the species nutrient dynamics and phenology. We photographed and collected whole lupine plants throughout one growing season, divided them into roots, leaves, and stem + inflorescence, and analyzed each fraction for three growth-limiting, phloem-mobile nutrients (N, P and K). The nutrient contents in roots were lowest during the flowering phase, while the nutrient contents in stems + inflorescences were lowest during the early flowering phase and increased until the seed ripening phase, before declining again in the seed dispersal phase. Leaf nutrient contents showed a general decrease throughout the season. Shoot:root ratios of nutrient contents were also maximized during flowering. Our conclusion is that mowing will weaken L. polyphyllus most when carried out between phenological phases 2 (less than 50% of flowers open) and 4 (more than 50% of flowers withering), with the most optimal timing being during phase 3, i.e., when more than 50% of flowers are open. Concerning the heterogeneity within L. polyphyllus populations, the phenological assessment before management should prioritize individuals that have progressed furthest in their development.
链接多叶lupinus polyphyllus的营养动态和物候以确定种群控制的正确时机
随着半自然草地的减少,道路边缘已成为草地植物的重要避难所,得益于类似传统草原的管理制度。然而,道路边缘对草地植物的保护价值受到了外来入侵植物的威胁。当茎根比较高或地下储量耗尽而种子尚未成熟时,割草对控制入侵植物最有效。本研究的目的是根据多叶松的营养动态和物候特征,确定多叶松的最佳刈割时间。我们在一个生长季节拍摄并采集了整株羽扇豆,将其分为根、叶和茎+花序,并对每个部分进行了三种生长限制性、韧皮部流动性营养物质(N、P和K)的分析。根的营养物质含量在开花期最低,茎+花序的营养物质含量在开花期早期最低,直到种子成熟期增加,然后在种子传播期再次下降。叶片养分含量在整个季节总体呈下降趋势。在开花期间,茎与根的养分含量比也最大。结果表明,在物候期2(花开放50%以下)和物候期4(花凋谢50%以上)之间进行刈割对多叶松的影响最大,而在物候期3(花开放50%以上)进行刈割效果最佳。对于多叶松种群内的异质性,在管理前的物候评估中应优先考虑发育进展最快的个体。
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来源期刊
Basic and Applied Ecology
Basic and Applied Ecology 环境科学-生态学
CiteScore
6.90
自引率
5.30%
发文量
103
审稿时长
10.6 weeks
期刊介绍: Basic and Applied Ecology provides a forum in which significant advances and ideas can be rapidly communicated to a wide audience. Basic and Applied Ecology publishes original contributions, perspectives and reviews from all areas of basic and applied ecology. Ecologists from all countries are invited to publish ecological research of international interest in its pages. There is no bias with regard to taxon or geographical area.
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