The Responses of Invasive Plant Alternanthera philoxeroides to Combined Treatments of N and P Supply

Abstract:

Due to the intensified human activities, atmospheric nitrogen deposition and agricultural and urban runoff have largely increased and led to the shifts in the N: P supply ratios in aquatic ecosystems. In this study, we examined the effects of N and P supply in waters and nutrient level in substrate on the growth and biomass allocation of the invasive plant Alternanthera philoxeroides. In the experiment, A. philoxeroides was applied to five combinations of water N and P supply across with two nutrient levels in substrate. The growth of A. philoxeroides was determined by N: P ratio and increased with the increase of N: P ratio. High nutrients in substrate also promoted the clonal growth and aboveground allocation of A. philoxeroides. Therefore, high soil nutrients at the water’s edge and high N: P supply ratio in water will facilitate the expansion and invasion of A. philoxeroides in aquatic habitats. In the context of increased anthropogenic nitrogen deposition and runoff inputs with high relative level of N, the invasion of A. philoxeroides to aquatic environments needs more attention.

• Periodical: Advanced Materials Research (Volumes 955-959)
• Pages: 512-516
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.955-959.512
• Online since: June 2014
• Authors: Wen Juan Ding, Hua Yong Zhang
• Keywords: Biomass Allocation, Clonal Growth, N: P Ratio, Nitrogen Deposition, Nutrient Level

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