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Invasive Chromolaena odorata species specifically affects growth of its co‐occurring weeds
Annals of the New York Academy of Sciences ( IF 5.2 ) Pub Date : 2020-03-13 , DOI: 10.1111/nyas.14330
Qiu-Yuan Xu 1 , Dan Wang 1 , Guo-Ming Quan 2 , Hui-Min Xiang 1 , Jia-En Zhang 3
Affiliation  

Plant–plant interaction is essential to weed invasion success and is related to impacts on the environment. To understand interactions of the well‐known invasive plant siamweed (Chromolaena odorata) and its neighbors (exotic Praxelis clematidea and native cadillo) in South China, and their competitive mechanisms above‐ and belowground, a multicultivation experiment was conducted. Competitive indices, plant morphological traits, soil nutrient contents, enzyme activities, and microbial biomass were measured. Competitive balance index and morphological traits revealed balanced competition between P. clematidea and siamweed, and suppressive effect of siamweed on cadillo. In coculture of siamweed and P. clematidea, the branch length of siamweed slightly lengthened, while the branch number of P. clematidea increased compared with their respective monocultures accordingly. Overall impacts of the two invaders on soil properties were near averages of their single impacts. In coculture of siamweed and cadillo, siamweed was more competitive in both light and nutrient capture; soil urease activity and acid phosphatase activity were magnified and mitigated compared with the averages of those in their respective monocultures, respectively. The species‐specific results of siamweed competing with its co‐occurring weeds would contribute to a better understanding of mechanism in synergistic effect of siamweed with the other invasive plants.

中文翻译:

入侵的 Chromolaena odorata 物种特别影响其共生杂草的生长

植物与植物的相互作用对于杂草入侵的成功至关重要,并且与对环境的影响有关。为了解华南著名入侵植物 siamweed (Chromolaena odorata) 及其邻居(外来的铁线莲和本地的 cadillo)的相互作用及其地上和地下的竞争机制,进行了多栽培实验。测量了竞争指数、植物形态特征、土壤养分含量、酶活性和微生物生物量。竞争平衡指数和形态性状揭示铁线莲和暹罗草之间存在平衡竞争,以及暹罗草对卡迪洛的抑制作用。暹罗草与铁线莲共养时,暹罗草的分枝长度略有延长,而铁线莲的分枝数增加。与各自的单一栽培相比,铁线莲增加了。两种入侵者对土壤性质的总体影响接近其单一影响的平均值。在siamweed和cadillo的共养中,siamweed在光和养分捕获方面更具竞争力;土壤脲酶活性和酸性磷酸酶活性与其各自单一栽培的平均值相比分别被放大和减弱。暹罗草与其共生杂草竞争的物种特异性结果将有助于更好地了解暹罗草与其他入侵植物协同效应的机制。siamweed 在光和养分捕获方面更具竞争力;土壤脲酶活性和酸性磷酸酶活性与其各自单一栽培的平均值相比分别被放大和减弱。暹罗草与其共生杂草竞争的物种特异性结果将有助于更好地了解暹罗草与其他入侵植物协同效应的机制。siamweed 在光和养分捕获方面更具竞争力;土壤脲酶活性和酸性磷酸酶活性与其各自单一栽培的平均值相比分别被放大和减弱。暹罗草与其共生杂草竞争的物种特异性结果将有助于更好地了解暹罗草与其他入侵植物协同效应的机制。
更新日期:2020-03-13
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