Characteristics of plant trait network and its influencing factors in impounded lakes and channel rivers of South-to-North Water Transfer Project, China.
Characteristics of plant trait network and its influencing factors in impounded lakes and channel rivers of South-to-North Water Transfer Project, China.
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DOI：
10.3389/fpls.2023.1127209
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发表时间：
2023
影响因子：
5.6
通讯作者：
中科院分区：
文献类型：
--
作者：
基于性状的方法已被广泛用于评价可变环境对沉水植物群落的影响。然而，从整体植物性状网络（PTN）的角度研究调水工程蓄水湖泊和河道沉水植物对环境因子的响应还很少。通过实地调查，研究了南水北调东线工程蓄水湖泊和河道PTN的拓扑结构特征，并分析了影响PTN拓扑结构的主要因素。总体而言，叶相关性状和器官质量分配性状是长江三峡库区蓄水湖泊和河道中PTNs的枢纽性状，变异性高的性状更有可能成为枢纽性状。此外，PTNs的结构表现出不同的蓄水湖泊和通道河流，PTNs的拓扑结构与湖泊和通道河流的平均功能变异系数。平均功能变异系数越高，PTN越紧，平均功能变异系数越低，PTN越松。水体总磷和溶解氧对PTN结构有显著影响。随着全磷含量的增加，边缘密度增加，而平均路径长度减小。边缘密度和平均聚类系数随着溶解氧的增加而显著降低，而平均路径长度和模块度随着溶解氧的增加而显著增加。本研究探讨了性状网络沿着环境梯度的变化模式和决定因素，以提高我们对调节性状相关性的生态规则的理解。
Trait-based approaches have been widely used to evaluate the effects of variable environments on submerged macrophytes communities. However, little research focused on the response of submerged macrophytes to variable environmental factors in impounded lakes and channel rivers of water transfer project, especially from a whole plant trait network (PTN) perspective. Here, we conducted a field survey designed to clarify the characteristic of PTN topology among impounded lakes and channel rivers of the East Route of South-to-North Water Transfer Project (ERSNWTP) and to unravel the effects of determining factors on the PTN topology structure. Overall, our results showed that leaf-related traits and organ mass allocation traits were the hub traits of PTNs in impounded lakes and channel rivers of the ERSNWTP, which traits with high variability were more likely to be the hub traits. Moreover, PTNs showed different structures among impounded lakes and channel rivers, and PTNs topologies were related to the mean functional variation coefficients of lakes and channel rivers. Specially, higher mean functional variation coefficients represented tight PTN, and lower mean functional variation coefficients indicated loose PTN. The PTN structure was significantly affected by water total phosphorus and dissolved oxygen. Edge density increased, while average path length decreased with increasing total phosphorus. Edge density and average clustering coefficient showed significant decreases with increasing dissolved oxygen, while average path length and modularity exhibited significant increases with increasing dissolved oxygen. This study explores the changing patterns and determinants of trait networks along environmental gradients to improve our understanding of ecological rules regulating trait correlations.
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