RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2009, Vol. 18 >> Issue (3): 234-240.

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ON THE EFFECTS OF DIFFERENT NUTRIENT CONCENTRATIONS OF SEDIMENT ON THE GROWTH AND RESOURCE ALLOCATION OF POTAMOGETON CRISPUS

  

  1. 1.Laboratory of Aquatic Plant Biology| Wuhan Botanical Garden| Chinese Academy of Sciences| Wuhan 430074| China； 2.College of Horticulture and Gardening| Yangtze University| Jingzhou 434025| China； 3.Yangtze River Fisheries Research Institute| Chinese Academy of Fishery Sciences| Jingzhou 434000|China
  • Online:2009-03-20

Abstract:

The influence of three kinds of sediments with different nutrient status on the growth and resource allocation of a submerged freshwater macrophyte Potamogeton crispus L.was examined outdoors in the pond.The results showed that the growth of submerged macrophyte P.crispus showed a temporary physiological response to different nutrient concentrations of sediment.Total soluble sugars content of leaves was higher on the fertile sediment than that on the low nutritional sediment at the early stages of plant growth.There was a regulation of allometric growth in the accumulation of biomass of roots，stems，leaves and turions of P.crispus，which showed different regulations of allometry.The ratios between belowground and aboveground biomass exhibited a dependent change on any sediment nutrient level.Allometric growth relationships between belowground biomass and aboveground biomass of P.crispus were significantly affected by the sediment nutrients.At the same time，the C∶N and N∶P ratios of turions were significantly affected by the three sediment types.However，the C∶N and N∶P ratios of leaves and stems were not significantly affected by the three sediment types.The response may change the fate of the turions in the second year，and affect the maintenance of the populations.With biomass allocation regulation，P.crispus firstly allocated more biomass to the formation of turions to continue the populations showing refuging lifehistory strategy under the stress of sediment nutrients

Key words: Potamogeton crispus, sediment, plant turion, stress, resource allocation

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