Effects of water nutrients on regeneration capacity of submerged aquatic plant fragments
Effects of water nutrients on regeneration capacity of submerged aquatic plant fragments
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DOI：
10.1051/limn/2014008
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发表时间：
2014-01-01
影响因子：
1
通讯作者：
Hussner, Andreas
中科院分区：
文献类型：
--
作者：
Kuntz, Katharina;Heidbuechel, Patrick;Hussner, Andreas
水生植物在世界上几乎所有淡水栖息地都发挥着重要作用。尽管沉水植物主要通过营养植物碎片的扩散传播，但大多数水生植物物种的分布范围很广。在无沉淀物条件下，研究了8种沉水植物(金鱼藻、油菜、加拿大伊乐藻、伊乐藻、黑藻、水生肉豆蔻、异叶肉豆娘和刺肉豆蔻)在不同水分营养条件下再生能力和再生类型(根和(或)枝)的差异。总体而言，在本研究中，毛状藻的再生率最高(82+/-2%)，其次是山毛藻(73+/-2%)和水生毛藻(47+/-4%)，而异叶木霉的再生率最低(1+/-1%)。加拿大淫羊草、轮叶淫羊草、北美淫羊茅茎段的再生率分别为40+/-2、23.2%、16.2%和7.1%。硝酸盐浓度对三种植物的再生能力有一定的影响，但对磷酸盐的影响不显著。此外，不同的营养浓度对加拿大独角龙、加拿大独角龙和轮叶龙须草的再生类型所占比例也有显著影响。综上所述，沉水植物的再生能力差异很大，水分营养对沉水植物碎片的再生具有潜在的影响。这可能会影响该物种在田间条件下的进一步定居和传播。
Aquatic plants play a substantial role in almost all freshwater habitats throughout the world. Even though submerged aquatic plants dominantly spread by the dispersal of vegetative plant fragments, most aquatic plant species show a broad distribution range. Here we studied the differences in the regeneration capacity and the regeneration type of fragments (by root and/or shoot growth) of eight submerged plant species (Ceratophyllum demersum, Egeria najas, Elodea canadensis, Elodea nuttallii, Hydrilla verticillata, Myriophyllum aquaticum, Myriophyllum heterophyllum and Myriophyllum spicatum) under different water nutrients in sediment-free conditions. Overall, M. spicatum showed the highest regeneration (82 +/- 2%) in this study, followed by C. demersum (73 +/- 2%) and M. aquaticum (47 +/- 4%), whereas M. heterophyllum showed the lowest (1 +/- 1%). The shoot fragments of E. canadensis, H. verticillata, E. najas and E. nuttallii regenerated by 40 +/- 2, 23 2, 16 2 and 7 1%. The nitrate concentration affected the regeneration capacities of E. najas (P = 0.05), M. spicatum (P = 0.013) and C. demersum (P = 0.001), whereas phosphate had no significant effect. Additionally, the different nutrient concentrations had a significant effect on the portion of the regeneration types within E. canadensis, E. nuttallii and H. verticillata. Summarizing, submerged plants differ significantly in their regeneration capacity, and water nutrients have a potential effect on the regeneration of submerged plant fragments. This might influence the further colonization and spread of the species under field conditions.