期刊
ANNALS OF THE NEW YORK ACADEMY OF SCIENCES
卷 1470, 期 1, 页码 57-66出版社
WILEY
DOI: 10.1111/nyas.14330
关键词
soil enzyme activity; soil microbial biomass; competitive balance index; relative yield; interspecific interaction
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 (exoticPraxelis clematideaand 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 betweenP. clematideaand siamweed, and suppressive effect of siamweed on cadillo. In coculture of siamweed andP. clematidea, the branch length of siamweed slightly lengthened, while the branch number ofP. clematideaincreased 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.
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