PDF(Pubmed)
Abstract：
Datura stramonium is an invasive herb of the family Solanaceae from Mexico and has been invading seriously in China. The effects of invasive plants on the functional traits of native plants and the stoichiometric characteristics of soil carbon, nitrogen and phosphorus in different habitats were explored by taking the invasive plant D. stramonium and coexisting native plants as the research object. The species, quantity and height of plants in sample plots in farmland, wasteland and roadside habitats were investigated and the specific leaf area (SLA), leaf carbon content (C), nitrogen content (N), carbon-to-nitrogen ratio (C:N), construction cost (CCmass) and stoichiometric characteristics of soil carbon (C), nitrogen (N) and phosphorus (P) were analyzed. The results showed that compared with the noninvaded area, the species and quantity of native plants decreased in the invaded area, and SLA and leaf N showed a decreasing trend. The plant height of native plants in the invaded area of the farmland and wasteland decreased by 23.19% and 15.26%, respectively, while the height of native plants along the roadside increased by 95.91%. The leaf C:N ratio of native plants in the invaded area along the roadside significantly increased by 54.07%. The plant height and leaf N of D. stramonium in the three habitats were higher than those of the native plants. The soil N in the invaded area of the three habitats increased, with the soil N in the farmland increasing by 21.05%, in the wasteland increasing by 9.82% and along the roadside significantly increasing by 46.85%. The soil carbon-to-phosphorus ratio (C:P) in the three habitats showed an increasing trend. The soil C:P ratio in the farmland increased by 62.45%, in the wasteland it increased by 11.91% and along the roadside it significantly increased by 71.14%. These results showed that invasion by D. stramonium has a great effect on the local ecosystem, and it has a high ability to capture resources. D. stramonium can improve its own competitiveness by enhancing invasiveness by changing the functional traits of native plants and the stoichiometric characteristics of soil C, N and P, which may be the reason for its invasive success.
摘要：
曼陀罗是来自墨西哥的茄科植物的入侵草本植物，在中国入侵严重。入侵植物对乡土植物功能性状和土壤碳化学计量特征的影响,以入侵植物D.stramonium和共存的乡土植物为研究对象，探索了不同生境中的氮磷。物种,农田样地植物的数量和高度，调查了荒地和路边的栖息地，并确定了特定的叶面积(SLA)，叶碳含量（C），氮含量（N），碳氮比（C：N），建筑成本(CCmass)和土壤碳(C)的化学计量特征，分析了氮(N)和磷(P)。结果表明，与非入侵地区相比，入侵地区原生植物的种类和数量减少，SLA和叶片N均呈下降趋势。农田和荒地侵入区乡土植物株高分别下降23.19%和15.26%,分别,而路边乡土植物的高度增加了95.91%。沿路边入侵地区的本地植物的叶片C：N比显着增加了54.07％。三个生境中的D.stramonium的株高和叶片N均高于本地植物。三个生境侵入区的土壤N增加,随着农田土壤氮增加21.05%，荒地增加9.82%，路边显着增加46.85%。3个生境土壤碳磷比(C:P)均呈增加趋势。农田土壤C:P比增加了62.45%,在荒地，上升了11.91％，在路边，上升了71.14％。这些结果表明，斯特拉米的入侵对当地生态系统有很大影响，它具有很高的捕获资源的能力。D.stramonium可以通过改变本地植物的功能特性和土壤C的化学计量特征来增强侵袭性，从而提高自身的竞争力，N和P,这可能是其侵入性成功的原因。
