底质营养盐对菹草生长及养分分配的影响

长江流域资源与环境 >> 2009, Vol. 18 >> Issue (3): 234-240.

底质营养盐对菹草生长及养分分配的影响

袁龙义^1,2, 陶玲^1,3, 李伟¹, 刘贵华

1.中国科学院武汉植物园水生植物生物学实验室| 湖北武汉 430074； 2.长江大学园艺园林学院| 湖北荆州 434025；
3.中国水产科学研究院长江水产研究所| 湖北荆州 434000

出版日期:2009-03-20

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

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

摘要/Abstract

摘要：

在野外池塘中，利用3种不同营养状况的底质研究底质营养盐对菹草生长及养分分配的影响，结果表明：沉水植物菹草面对底质营养盐的胁迫出现了急性的生理生化反应，在生长初期叶片总的可溶性糖含量在肥沃的底质上高于贫营养底质上；根、茎、叶和石芽各构件都具有异速生长现象，并且表现规律不一样；菹草的根冠比随底质营养盐的不同而变化；随着营养条件对菹草生长胁迫加重，根、冠的异速生长愈明显，同时石芽的N∶P和C∶N比率显著受底质营养盐的影响，而菹草叶片和茎N∶P和C∶N比率不受底质肥力的影响，这些响应将改变石芽第2年的命运和影响种群的维持；在胁迫生境下，菹草首先分配资源到无性繁殖体——石芽上以便维持种群的延续，以回避策略应对底质营养盐胁迫。

关键词: 菹草, 底质, 植物石芽, 胁迫, 物质分配

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

袁龙义陶玲李伟刘贵华. 底质营养盐对菹草生长及养分分配的影响[J]. 长江流域资源与环境, 2009, 18(3): 234-240.

YUAN Long-Xi, Dao-Ling-??20Li-Wei, LIU Gui-Hua. ON THE EFFECTS OF DIFFERENT NUTRIENT CONCENTRATIONS OF SEDIMENT ON THE GROWTH AND RESOURCE ALLOCATION OF POTAMOGETON CRISPUS[J]. RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN, 2009, 18(3): 234-240.

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