Xing Wei, Wu Haoping, Shi Qiao, Hao Beibei, Liu Han, Wang Zhixiu, Liu Guihua
Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430074, China.
1] Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430074, China [2] University of Chinese Academy of Sciences, Beijing 100049, China.
Sci Rep. 2015 May 13;5:10186. doi: 10.1038/srep10186.
Stoichiometric homeostasis of element composition is one of the central concepts of ecological stoichiometry. We analyzed concentrations of macroelements (C, N, P, Ca, K, Mg, S), microelements (Cu, Fe, Mn, Mo, Ni, Zn) and beneficial elements (Na, Se, Si) in submerged macrophytes, water and sediments across 20 Yunnan plateau lakes. We predicted that tissue element composition in submerged macrophytes is affected by lake trophic level and taxonomy, and submerged macrophytes have weak stoichiometric homeostasis for all above 16 elements. Canonical discriminant analyses successfully discriminated among trophic level groups and taxa groups. Of all the elements, C, N, P and S most effectively discriminated among trophic level groups across 20 lakes, revealing lake trophic level mostly affect tissue macroelement composition in submerged macrophytes; while Ca, K and Se most effectively discriminated among submerged macrophytes taxa groups, suggesting taxonomy mostly affect compositions of macroelements and beneficial elements in submerged macrophytes. In addition, the stoichiometric homeostatic coefficient of 1/HCa:C for all five taxa of submerged macrophytes were less than zero, suggesting submerged macrophytes in Yunnan plateau lakes have strong Ca stoichiometric homeostasis. Our findings, not only broaden the knowledge of multielement stoichiometric homeostasis, but also help to choose most appropriate lake management strategy.
元素组成的化学计量稳态是生态化学计量学的核心概念之一。我们分析了云南高原20个湖泊中沉水植物、水和沉积物中的大量元素（碳、氮、磷、钙、钾、镁、硫）、微量元素（铜、铁、锰、钼、镍、锌）和有益元素（钠、硒、硅）的浓度。我们预测沉水植物的组织元素组成受湖泊营养水平和分类学的影响，并且沉水植物对上述所有16种元素的化学计量稳态较弱。典型判别分析成功地区分了营养水平组和分类群组。在所有元素中，碳、氮、磷和硫最有效地区分了20个湖泊的营养水平组，表明湖泊营养水平主要影响沉水植物的组织大量元素组成；而钙、钾和硒最有效地区分了沉水植物分类群组，表明分类学主要影响沉水植物中大量元素和有益元素的组成。此外，所有五个沉水植物分类群的1/HCa:C化学计量稳态系数均小于零，表明云南高原湖泊中的沉水植物具有较强的钙化学计量稳态。我们的研究结果不仅拓宽了对多元素化学计量稳态的认识，也有助于选择最合适的湖泊管理策略。
