不同基质中水鳖对共存的穗花狐尾藻和金鱼藻的影响

发布时间：2019-02-25 10:28

【摘要】：研究设置了营养水平不同的3种基质,在有或无浮水植物水鳖共存的情况下,混合种植营养吸收方式不同的两种沉水植物(仅从水中吸收营养的金鱼藻和从水和基质都能吸收营养的穗花狐尾藻),探讨在不同的基质中浮水植物对沉水植物的影响。结果显示:实验中水鳖的存在均未对共存的两种沉水植物的生长产生抑制作用。当水鳖覆盖水面时,与无根的金鱼藻竞争光照和水体营养,促使其增加分枝数和茎长,并增加叶生物量的分配,最终导致水鳖的共存促进了金鱼藻的生物量积累。但与金鱼藻不同,有根的穗花狐尾藻可通过基质吸收营养,与共存的水鳖之间只存在光照竞争,使穗花狐尾藻仅以改变植株形态来适应浮水植物的表层覆盖,生物量积累并未发生显著变化。与沙处理相比,水鳖在营养水平较高的泥处理和泥沙混合处理中生长更旺盛,基质没有显著影响沉水植物的生物量和分株数。因此,在退化湿地生态系统中恢复水生植物时,为了提高群落的物种多样性,可以将沉水植物与少量的浮水植物组合配置,少量的浮水植物不会对沉水植物的生长带来负面影响。
[Abstract]:In this study, three kinds of substrates with different nutrient levels were set up, and under the condition that there were or no floating water plants, the soft-shelled turtle was coexisting. The effects of phytoplankton on submerged plants were studied by mixed cultivation of two submerged plants with different nutrient absorption patterns (only goldfish algae which can absorb nutrients from water and substrate) and Spike foxtail algae which can absorb nutrients from both water and substrate. The effects of phytoplankton on submerged plants in different substrates were studied. The results showed that the existence of soft-shelled turtle did not inhibit the growth of two submerged plants. When the shelled turtle covered the water surface, it competed with the rootless goldfish algae for light and water nutrition, which made it increase the number of branches and stem length, and increase the distribution of leaf biomass, which resulted in the coexistence of the turtle and the accumulation of the biomass of goldfish algae. However, different from goldfish, the rootstocks can absorb nutrients through the substrate, and there is only a competition of light between them, which makes them adapt to the surface layer of the phytoplankton only by changing the plant shape. Biomass accumulation did not change significantly. Compared with the sand treatment, the water turtle grew more vigorously in the mud treatment and the sediment mixed treatment, and the substrate had no significant effect on the biomass and plant number of submerged plants. Therefore, when restoring aquatic plants in degraded wetland ecosystems, in order to improve the species diversity of communities, submerged plants can be combined with a small number of phytoplankton. A small amount of phytoplankton does not negatively affect the growth of submerged plants.
【作者单位】：华中师范大学生命科学学院;
【基金】：汉丰湖湖滨带湿地生态修复技术示范(2013ZX07104-004-03) 华中师范大学中央高校基本科研业务费专项资金(No.CCNU16A02032)资助~~
【分类号】：S931.1;X52

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