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Nitrogen-removal ability and niche of Coix lacryma-jobi and Reineckia carnea in response to NO3−/NH4+ ratio

2014; Elsevier BV; Volume: 120; Linguagem: Inglês

10.1016/j.aquabot.2014.05.016

1879-1522

Biqing Chen, Dong Liu, Wenjuan Han, Xing Fan, Haiqin Cao, Qinsu Jiang, Yu Liu, Chang Jie, Ying-En Ge,

Polymer-Based Agricultural Enhancements

Abstract Wastewater comes from various sources with remarkably different nitrate (NO 3 − )/ammonium (NH 4 + ) 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 NO 3 − /NH 4 + ratios. In this study, we investigated the growth traits and nitrogen accumulation of Coix lacryma-jobi and Reineckia carnea under five NO 3 − /NH 4 + 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 NO 3 − /NH 4 + ratio of 50/50 for C. lacryma-jobi , but those were the highest under a ratio of 75/25 for R. carnea . Under the NH 4 + -only (0/100) treatment, C. lacryma-jobi exhibited ammonium toxicity with leaf nitrogen concentration (43 mg g −1 ) exceeding the maximum limit for plants. In contrast, R. carnea showed less sensitivity to NO 3 − /NH 4 + 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).