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Effects of Acmella radicans Invasion on Soil Seed Bank Community Characteristics in Different Habitats

文献类型： 外文期刊

作者： Wu, Xiaohan 1 ; Yang, Kexin 1 ; Zheng, Fengping 2 ; Xu, Gaofeng 2 ; Fan, Zewen 1 ; Clements, David Roy 5 ; Yang, Yunhai 2 ; Yang, Shaosong 2 ; Jin, Guimei 2 ; Zhang, Fudou 2 ; Shen, Shicai 2 ;

作者机构： 1.Yunnan Univ, Sch Agr, Kunming 650504, Peoples R China

2.Agr Environm & Resource Res Inst, Yunnan Acad Agr Sci, Key Lab Prevent & Control Biol Invas, Minist Agr & Rural Affairs China, Kunming 650205, Peoples R China

3.Yunnan Acad Agr Sci, Agr Environm & Resource Res Inst, Key Lab Green Prevent & Control Agr Transboundary, Kunming 650205, Peoples R China

4.Yunnan Lancang Mekong Agr Biosecur Int Sci & Techn, Kunming 650205, Peoples R China

5.Trinity Western Univ, Dept Biol, Langley, BC V2Y 1Y1, Canada

关键词： Acmella radicans; soil seed bank; seed density; species diversity; invasive plant

期刊名称：PLANTS-BASEL （ 影响因子：4.1； 五年影响因子：4.5 ）

ISSN： 2223-7747

年卷期： 2024 年 13 卷 18 期

页码：

收录情况： SCI

摘要： To examine the effects of the recent Acmella radicans invasion on plant community and diversity in invaded habitats, the composition, density, species richness, diversity indices, and evenness index of the soil seed bank community of two different habitats (wasteland and cultivated land) in Yunnan Province, China, were analyzed through field sampling and greenhouse germination tests. A total of 28 species of plants belonging to 15 families and 28 genera, all annual herbs, were found in the soil seed bank. Seed densities and species number in the seed bank tended to be greater in April than in October; cultivated land also featured higher seed densities and species numbers compared to wasteland. With increased A. radicans cover, the seed bank population of A. radicans also significantly increased, but the seed bank populations of many other dominant species (e.g., Ageratum conyzoides and Gamochaeta pensylvanica) and native species (e.g., Laggera crispata and Poa annua) clearly declined. The germination of A. radicans seeds was concentrated during the period from the 4th to the 5th weeks. Vertically, the seed number of A. radicans was significantly different among the 0-5 cm, 5-10 cm and 10-20 cm layers that accounted for 80.7-90.6%, 9.4-16.1% and 0.0-3.2% of the total seed density in wasteland, respectively; and in cultivated land, A. radicans accounted for 56.8-64.9%, 26.7-31.8% and 8.1-13.5% of the total seed density, respectively. With reduced A. radicans cover, the species richness, Simpson index, Shannon-Wiener index, and Pielou indices of the weed community generally increased, and most diversity indices of weed communities in cultivated land were lower than in wasteland under the same cover of A. radicans. The results indicate that the invasion of A. radicans has negatively affected local weed community composition and reduced weed community diversity, and that these negative impacts in cultivated land may be enhanced by human disturbance. Our study was the first to elucidate the influence of A. radicans invasion on soil seed bank community characteristics in invaded habitats, providing a better understanding of its invasion and spread mechanisms in order to aid in developing a scientific basis for the prevention and control of this invader.

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