Interspecific competition effects on phosphorus accumulation by Hydrilla verticillata and Vallisneri

• 作 者: Xiufeng Zhang Zhengwen Liu
• 机 构: Institute of Hydrobiology of Jinan University, Guangzhou 510632, China.;State Key Laboratory of Lake
• 出 处: 环境科学学报（英文版）
• 发表日期: 2011年8期
• 关键词: interspecific competition submersed plants phosphorus storage

The competition between submersed plants has been recognized as an important factor influencing the structure of plant communities in shallow lakes.The ability of different species to take up and store nutrients from the surrounding ambience varies,and hence plant community structure might be expected to affect the cycling of nutrients in lake ecosystems.In this study,the uptake of phosphorus by Hydrilla verticillata and Vallisneria natans was studied and compared in monoculture and competitive mixed-culture plantings.Results showed that for both studied species the phosphorus concentrations of different tissues and of whole plants was unaffected by competition.However,the quantity of phosphorus accumulated by whole plants of H.verticillata was significantly higher in mixture culture than in monoculture,while that of V.natans was lower in the mixed culture.The results indicated that H.verticillata has a competitive advantage over V.natant,when the two species are grown in competition,and is able to accumulate a greater quantity of phosphorus.