Trace element stoichiometry of submerged macrophytes in Yangtze floodplain lakes and Yunnan plateau lakes (China)
Trace element stoichiometry of submerged macrophytes in Yangtze floodplain lakes and Yunnan plateau lakes (China)
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DOI：
10.1007/s00027-016-0481-4
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发表时间：
2016
期刊：
影响因子：
2.4
通讯作者：
W. Xing;Haoping Wu;Beibei Hao;Han Liu;Guihua Liu
中科院分区：
文献类型：
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作者：
W. Xing;Haoping Wu;Beibei Hao;Han Liu;Guihua Liu
微量元素平衡是生态化学计量学中的一个重要参数。然而，对沉水植物微量元素的化学计量学知之甚少。我们假设，湖泊营养盐（N和P）和分类强烈影响组织微量元素（Al，As，Ba，Cd，Co，Cr，Li，Pb和Sr）的组成和沉水植物在长江漫滩湖泊和云南高原湖泊（中国）的动态平衡。沉水植物在这两组湖泊中具有Co化学计量平衡。长江漫滩湖泊沉水植物Cd化学计量稳态较高，而云南高原湖泊沉水植物Cr、Li、Pb化学计量稳态较高。典型对应分析（CCA）表明，湖泊营养盐改变了沉水植物的微量元素组成。水体总氮（WTN）与各类型湖泊组织中的As和Cd均呈正相关，表明WTN影响沉水植物组织中As和Cd的含量和组成。典型判别分析（CDA）成功地区分了沉水植物的分类群，揭示了沉水植物的多元素组成在不同分类群之间存在显著差异。长江漫滩湖泊与云南高原湖泊在类群和微量元素方面存在着相似的关系，表明某些沉水植物科积累了特定的元素。长江漫滩湖泊与云南高原湖泊微量元素组成的差异表明，沉水植物的微量元素组成受分类和周围环境的影响。
Trace element balance is a key parameter in ecological stoichiometry. However, little is known about trace element stoichiometry of submerged macrophytes. We hypothesized that lake nutrients (N and P) and taxonomy strongly affect tissue trace element (Al, As, Ba, Cd, Co, Cr, Li, Pb and Sr) composition and homeostasis of submerged macrophytes in Yangtze floodplain lakes and Yunnan plateau lakes (China). Submerged macrophytes had Co stoichiometric homeostasis in these two sets of lakes. Moreover, submerged macrophytes in Yangtze floodplain lakes had higher Cd stoichiometric homeostasis, whereas submerged macrophytes in Yunnan plateau lakes had higher Cr, Li and Pb stoichiometric homeostasis. Lake nutrients altered trace element composition of submerged macrophytes as shown by canonical correspondence analysis (CCA). Total nitrogen in water (WTN) positively correlated with tissue As and tissue Cd for all lake types, indicating WTN influenced the concentration and composition of tissue As and tissue Cd in submerged macrophytes. Canonical discriminant analysis (CDA) successfully discriminated among submerged macrophyte taxa, revealing there are significant differences in multielement composition of submerged macrophytes among taxonomy. Some similar relationships of taxa and trace elements between Yangtze floodplain lakes and Yunnan plateau lakes indicated that certain families of submerged macrophytes accumulate specific elements. Differences in relationships of taxa and trace elements between Yangtze floodplain lakes and Yunnan plateau lakes indicated that trace element composition of submerged macrophytes could be affected both by taxonomy and the ambient environment.