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水柱中高铵(NH₄⁺)浓度对沉水植物苦草的生理胁迫

Physiological stress of high NH (4) (+) concentration in water column on the submersed macrophyte Vallisneria Natans L.

作者信息

Cao Te, Xie Ping, Li Zhongqiang, Ni Leyi, Zhang Meng, Xu Jun

机构信息

State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, The Chinese Academy of Sciences, Wuhan, People's Republic of China.

出版信息

Bull Environ Contam Toxicol. 2009 Mar;82(3):296-9. doi: 10.1007/s00128-008-9531-5. Epub 2008 Oct 22.

Abstract

The submersed macrophyte, Vallisneria natans L., was cultured in laboratory with NH (4) (+) -enriched tap water (1 mg L(-1) NH(4)-N) for 2 months and the stressful effects of high ammonium (NH (4) (+) ) concentrations in the water column on this species was evaluated. The plant growth was severely inhibited by the NH (4) (+) supplement in the water column. The plant carbon and nitrogen metabolisms were disturbed by the NH (4) (+) supplement as indicated by the accumulation of free amino acids and the depletion of soluble carbohydrates in the plant tissues. The results suggested that high NH (4) (+) concentrations in the water column may hamper the restoration of submersed vegetation in eutrophic lakes.

摘要

沉水植物苦草(Vallisneria natans L.)在实验室中用富含铵离子(NH(4)(+))的自来水(1毫克/升铵态氮)培养2个月,评估了水柱中高浓度铵离子(NH(4)(+))对该物种的胁迫效应。水柱中添加铵离子(NH(4)(+))严重抑制了植物生长。植物组织中游离氨基酸的积累和可溶性碳水化合物的消耗表明,添加铵离子(NH(4)(+))扰乱了植物的碳氮代谢。结果表明,水柱中高浓度的铵离子(NH(4)(+))可能会阻碍富营养化湖泊中沉水植被的恢复。

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