Plant competition has been recognized as one of the most important factors influencing the structure and function of lake ecosystems. Competition from plants of dissimilar growth form may have profound effects on shal...Plant competition has been recognized as one of the most important factors influencing the structure and function of lake ecosystems. Competition from plants of dissimilar growth form may have profound effects on shallow lakes. An experiment was conducted to investigate the effects of competitive interactions of submersed plants with dissimilar growth forms on the biomass allocations. Hydrilla verticillata and Vallisneria natans were selected and were planted in a single-species monoculture and a mixed-species pattern. Results showed that the growth of V. natans was significantly affected by the H. verticillata and caused a sharp reduction of biomass, but the root:shoot ratio of V. natans was not affected significantly and there was a minimal increase in mixture; while for H. verticillata, the biomass and the root:shoot ratio were not significantly changed by the competitive interactions of V. natans, there was minimal increase of biomass and minimal decrease of the root:shoot ratio. These results may indicate that the plant which can develop a dense mat or canopy at the water surface would be a stronger competitor relative to the plant that depends more on light availability near the sediment.展开更多
基金sponsored by China Postdoctoral Science Foundation (Grant No.20090461149)the Postdoctoral Science Foundation of Jiangsu Province (Grant No. 0802029C)the Youth Science Foundation of JINAN Univeristy (Grant No. 51208026)
文摘Plant competition has been recognized as one of the most important factors influencing the structure and function of lake ecosystems. Competition from plants of dissimilar growth form may have profound effects on shallow lakes. An experiment was conducted to investigate the effects of competitive interactions of submersed plants with dissimilar growth forms on the biomass allocations. Hydrilla verticillata and Vallisneria natans were selected and were planted in a single-species monoculture and a mixed-species pattern. Results showed that the growth of V. natans was significantly affected by the H. verticillata and caused a sharp reduction of biomass, but the root:shoot ratio of V. natans was not affected significantly and there was a minimal increase in mixture; while for H. verticillata, the biomass and the root:shoot ratio were not significantly changed by the competitive interactions of V. natans, there was minimal increase of biomass and minimal decrease of the root:shoot ratio. These results may indicate that the plant which can develop a dense mat or canopy at the water surface would be a stronger competitor relative to the plant that depends more on light availability near the sediment.
