Abstract: To examine the effects of soil nutrients on leaf nitrogen (N), and phosphorus (P), and N∶P stoichiometry in Poyang Lake wetlands, we collected leaf and rhizospheric soil samples and analyzed N and P concentrations. Results showed that leaf N concentration ranged from 0.44 to 3.02 g·kg^-1, with an average of 21.71±8.99 g·kg^-1. Leaf P concentration varied from 0.44 to 3.02 g·kg^-1, with an average of 1.38±0.53 g·kg^-1. The mean of foliar N∶P ratio was 17.19±8.23, suggesting that P, rather than N availability, mainly limited plant growth in Poyang Lake wetlands. Moreover, leaf N and P concentrations were more sensitive to changes in soil P availability rather than soil N availability. Leaf N∶P stoichiometry was well constrained in Poyang Lake wetlands, in that variation in soil N and P did not alter foliar N∶P. In addition, the signi ficantly positive correlations between leaf N and P concentrations were found in various soil nutrient environments. The relationship between N and P in leaves did not shift with the changes of soil nutrients.

Key words: Oncorhynchus keta, fork length at 50% of individuals reached sexual maturity (L₅₀), effect assessment, enhancement release