Keywords:
<I>Ottelia acuminata</I> (Gagnep.)Dandy seedling, ammonia tolerance thresholds, antioxi-dase system indices, malondialdehyde.
As a typical representative plant of Erhai Lake in Yunnan Province, Ottelia acuminata (Gagnep.) Dandy has an important ecological status. Erhai Lakeside has characteristics of a low-polluted water that contains major polluted sources, such as ammonia. A simulated experi-ment based on these characteristics was per-formed in 2013 to determine the ammonia toler-ance threshold of macrophyte seedlings through the analysis of antioxidase system indices and malondialdehyde. The tolerance threshold of the seedlings was given as the symbol Nmtor. The re-sults showed that in a blank substrate simulated experiment, the ammonia tolerance threshold of the seedling is 0.5
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*Corresponding author E-mail: chuzhs@126.com