Wastewater comes from various sources with remarkably different nitrate (NO3
−
)/ammonium (NH4
+
)
ratios. In order to choose coexisting plant species for treating wastewater with various compositions
in constructed wetlands, it is important to know the performances of plant species under different
NO3
−
/NH4
+
ratios. In this study, we investigated the growth traits and nitrogen accumulation of Coix
lacryma-jobi and Reineckia carnea under five NO3
−
/NH4
+
ratios (100/0, 75/25, 50/50, 25/75 and 0/100)
in a hydroponic system. Results showed that, the total biomass, aboveground biomass and aboveground
nitrogen accumulation were the greatest under a NO3
−
/NH4
+
ratio of 50/50 for C. lacryma-jobi, but those
were the highest under a ratio of 75/25 for R. carnea. Under the NH4
+
-only (0/100) treatment, C. lacrymajobi exhibited ammonium toxicity with leaf nitrogen concentration (43mg g−1
) exceeding the maximum
limit for plants. In contrast, R. carnea showed less sensitivity to NO3
−
/NH4
+
ratios as the coefficient of
variance for biomass of R. carnea (17%) was less than half of that of C. lacryma-jobi (40%). The two plant
species differed in nitrogen niche (niche overlap = 0.42).
Wastewater comes from various sources with remarkably different nitrate (NO3
−
)/ammonium (NH4
+
)
ratios. In order to choose coexisting plant species for treating wastewater with various compositions
in constructed wetlands, it is important to know the performances of plant species under different
NO3
−
/NH4
+
ratios. In this study, we investigated the growth traits and nitrogen accumulation of Coix
lacryma-jobi and Reineckia carnea under five NO3
−
/NH4
+
ratios (100/0, 75/25, 50/50, 25/75 and 0/100)
in a hydroponic system. Results showed that, the total biomass, aboveground biomass and aboveground
nitrogen accumulation were the greatest under a NO3
−
/NH4
+
ratio of 50/50 for C. lacryma-jobi, but those
were the highest under a ratio of 75/25 for R. carnea. Under the NH4
+
-only (0/100) treatment, C. lacrymajobi exhibited ammonium toxicity with leaf nitrogen concentration (43mg g−1
) exceeding the maximum
limit for plants. In contrast, R. carnea showed less sensitivity to NO3
−
/NH4
+
ratios as the coefficient of
variance for biomass of R. carnea (17%) was less than half of that of C. lacryma-jobi (40%). The two plant
species differed in nitrogen niche (niche overlap = 0.42).
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