How many submerged macrophyte species are needed to improve water clarity and quality in Yangtze floodplain lakes?
How many submerged macrophyte species are needed to improve water clarity and quality in Yangtze floodplain lakes?
复制标题
需要多少沉水植物物种才能改善长江漫滩湖泊的水体透明度和质量？
DOI：
10.1016/j.scitotenv.2020.138267
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发表时间：
2020-07-01
影响因子：
9.8
通讯作者：
Xing, Wei
中科院分区：
文献类型：
--
作者：
Liu, Han;Zhou, Wen;Xing, Wei
成功重建和维持沉水植物是浅水富营养化湖泊恢复的关键问题，因为沉水植物可以通过其结构化作用促进湖泊生态系统从浊水状态向清水状态的转变。然而，很少有人知道的最佳数量的水生植物物种（物种丰富度）所需的浅水富营养化湖泊的恢复。通过对长江中下游沿着19个浅水富营养化湖泊的调查，揭示了水体透明度、水质和物种丰富度之间的内在联系。结果表明，水体营养盐（TN、TP）与K-d、红/蓝光比值呈正相关，表明水质不良会显著降低水体的透明度。通径分析结果表明，水下光气候直接影响沉水植物的形态、生理性状和物种丰富度。功能性状的变化对沉水植物物种丰富度也有显著影响。此外，沉水植物的存在不仅对水下光气候（水的透明度）有积极的影响，而且对水质也有影响。最重要的是，组合的三个或更多的沉水植物物种可以显着提高水质的透明度，在这些采样的富营养化湖泊，但不是水质。此外，穗花狐尾藻和苦草的基本种组合可用于富营养化长江漫滩湖泊沉水植物的恢复。因此，物种丰富度和物种组合是浅水富营养化湖泊沉水植物恢复的关键。(C)2020爱思唯尔B. V.保留所有权利。
Successful re-establishment and maintenance of submerged macrophytes is a pivotal problem for the restoration of shallow eutrophic lakes, since submerged macrophytes can facilitate a shift of lake ecosystems from a turbid water state to a clearwater state through their structuring roles. However, little is known about the optimal number of macrophyte species (species richness) needed for the recovery of shallow eutrophic lakes. Here, we investigated 19 shallow eutrophic lakes along the mid-lower reaches of the Yangtze River to reveal the underlying interrelations among water clarity, water quality and species richness. Our results showed positive correlations of water nutrients (TN and TP) with K-d and Red/Blue light ratio, suggesting that bad water quality can significantly lower water clarity. The results of path analysis indicated that the underwater light climate directly affects morphological and physiological traits and species richness of submerged macrophytes. Changes in functional traits also affected significantly the species richness of submerged macrophytes. Moreover, the presence of submerged macrophytes not only had positive effects on the underwater light climate (water clarity), but also on water quality. Most importantly, the assemblage of three or more submerged macrophyte species can significantly improve water clarity in these sampled eutrophic lakes, but not water quality. Additionally, the basic species assemblage of Myriophyllum spicatum and Vallisneria natans can be used for restoration of submerged macrophytes in shallow eutrophic Yangtze floodplain lakes. It is concluded that species richness and species assemblage are critical for recovery of submerged macrophytes in shallow eutrophic lakes. (C) 2020 Elsevier B.V. All rights reserved.