Wen Ji-Hui, Li Bing-Yao, Xiao Hong-Yu, Gong Cai-Ying, Gao An-Guo, Wang Yan-Hong, Li De-Liang, Zeng Hong-Yuan, Li You-Zhi, Yuan Gui-Xiang, Fu Hui, Wu Ai-Ping
Ecology Department, College of Resources and Environment, Hunan Provincial Key Laboratory of Rural Ecosystem Health in Dongting Lake Area, Hunan Agricultural University, Changsha 410128, China.
State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Hangzhou 311300, China.
Plants (Basel). 2023 Mar 6;12(5):1193. doi: 10.3390/plants12051193.
Water level rise is considered an environmental filter for the growth and reproduction of aquatic plants in lakes. Some emergent macrophytes can form floating mats, enabling them to escape from the negative effects of deep water. However, an understanding of which species can be uprooted and form floating mats easily and what factors affect these tendencies remains greatly elusive. We conducted an experiment to determine whether the monodominance of in the emergent vegetation community in Lake Erhai was related to its floating mat formation ability and to try to find the reasons for its floating mat formation ability during the continuous increase in water level over the past few decades. Our results showed that both the frequency and biomass proportion of were greater among the plants on the floating mats. Furthermore, was more likely to be uprooted than the other three previously dominant emergent species due to its smaller angle between the plant and the horizontal plane, rather than the root:shoot or volume:mass ratios. The dominance of in the emergent community in Lake Erhai is due to its easier ability to become uprooted, allowing it to outperform other emergent species and become the single dominant emergent species under the environmental filter of deep water. The ability to uproot and form floating mats may be a competitive survival strategy for emergent species under the conditions of continuous significant water level rise.
水位上升被认为是湖泊中水生植物生长和繁殖的一个环境筛选因素。一些挺水大型植物可以形成漂浮草甸，使它们能够免受深水的负面影响。然而，对于哪些物种能够轻易被连根拔起并形成漂浮草甸，以及哪些因素影响这些趋势，目前仍知之甚少。我们进行了一项实验，以确定洱海挺水植被群落中[物种名称]的单优势度是否与其形成漂浮草甸的能力有关，并试图找出在过去几十年水位持续上升期间其形成漂浮草甸能力的原因。我们的结果表明，在漂浮草甸上的植物中，[物种名称]的出现频率和生物量比例都更高。此外，由于[物种名称]植株与水平面之间的夹角较小，而不是根冠比或体积质量比，它比其他三种先前占优势的挺水物种更有可能被连根拔起。[物种名称]在洱海挺水群落中的优势地位是由于其更容易被连根拔起，使其在深水的环境筛选下优于其他挺水物种，成为单一的优势挺水物种。在水位持续显著上升的条件下，连根拔起并形成漂浮草甸的能力可能是挺水物种的一种竞争性生存策略。
