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首页> 外文期刊>Freshwater Biology >Resource allocation in the submerged plant Vallisneria natans related to sediment type, rather than water-column nutrients
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Resource allocation in the submerged plant Vallisneria natans related to sediment type, rather than water-column nutrients

机译：淹没植物苦草（Vallisneria natans）的资源分配与沉积物类型有关，而不是与水柱养分有关

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1. Phenotypic plasticity in resource allocation by Vallisneria natans was investigated in a greenhouse experiment, using three types of sediment (sandy loam, clay, and a 50 : 50 (by volume) mixture of the two sediments) and two levels of water-column nutrient. The clay was collected from a highly eutrophic lake in Jiangsu Province, China, and the N and P concentrations applied in nutrient media were at the upper limits observed in most lakes of China. 2. Growth and biomass allocation were significantly affected by sediment type, rather than water-column nutrients. Plant growth in clay and the mixture were similar, and 2.4-3.4 times higher than that in sandy loam. Compared with the plants grown in clay or the mixed sediments, the plants grown in sandy loam allocated relatively more biomass to root (11-17% versus 7-8% of total biomass), and relatively less to leaf (76-82% versus 86-87% of total biomass). Plastic variations in root area were induced by sediment type alone (P < 0.05), whereas the impacts of sediment type and water-column nutrients on leaf area were insignificant (P > 0.05). 3. Plant N and P concentrations were significantly affected by both sediment type and water-column nutrients. Increased nutrient availability in the water column enhanced plant N concentration by 3.5-20.2%, and plant P concentration by 19.1-25.8%. 4. Biomass accumulation and plant nutrient concentration in plants grown in different sediment types and water-column nutrients indicate that sediment type had more significant impacts on growth and N and P concentrations of V. natans than did water-column nutrients. Changes in phenotype are a functional response to nutrient availability in sediment, rather than to water-column nutrients.
机译：1.在温室实验中，使用了三种沉积物（砂壤土，粘土和两种沉积物的50:50（按体积计）的混合物）和两种水柱水平，研究了Vallisneria natans在资源分配中的表型可塑性。养分。粘土是从中国江苏省的一个富营养化湖泊中收集的，营养介质中施用的氮和磷浓度在中国大多数湖泊中均处于上限。 2.沉积物类型而不是水柱养分显着影响生长和生物量分配。粘土和混合物中的植物生长相似，比沙壤土高2.4-3.4倍。与用粘土或混合沉积物种植的植物相比，用沙壤土种植的植物分配给根的生物量相对较多（11-17％比总生物量的7-8％），分配给叶片的相对较少（76-82％总生物量的86-87％）。根系的塑性变化仅由沉积物类型引起（P <0.05），而沉积物类型和水柱养分对叶面积的影响不明显（P> 0.05）。 3.沉积物类型和水柱养分均显着影响植物的氮和磷浓度。水柱中养分利用率的提高使植物氮素浓度提高了3.5-20.2％，植物磷素浓度提高了19.1-25.8％。 4.在不同沉积物类型和水柱养分下生长的植物中的生物量积累和植物养分浓度表明，沉积物类型对V. natans的生长以及氮和磷浓度的影响比水柱养分更大。表型的变化是对沉积物中养分利用率的功能性响应，而不是对水柱养分的响应。

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