Short-time response in root morphology of alien invasive plant Amaranthus retroflexus to water level gradient in wetland

In order to understand the invasibility of wetland ecosystem, controlled experiment was conducted to investigate the response of root morphology of the alien invasive plant <i>Amaranthus retroflexus</i> L. to water level gradient in wetland. Water level from low to high resulted in dry, wet and flooding conditions. There were five replicates in each treatment. The data, including biomass and root morphological parameters (root mean diameter, root length, root surface, root volume, special root length, special root surface), were collected by weighing and analyzing using WinRHIZO after scanned.