Institute of Agricultural Sciences, Federal University of Jequitinhonha and Mucuri Valleys, Unaí, Brazil.
Department of Sanitary and Environmental Engineering, Federal University of Minas Gerais, Belo Horizonte, Brazil.
J Environ Sci Health A Tox Hazard Subst Environ Eng. 2021;56(3):248-256. doi: 10.1080/10934529.2020.1868821. Epub 2021 Jan 7.
The objective of this study was to evaluate the productivity of shoot dry biomass and the capacity of nitrogen (N), phosphorus (P) and potassium (K) extraction by the Vetiver and Tifton 85 grasses when cultivated in horizontal subsurface flow constructed wetlands (HSSF-CWs) whose porous medium was saturated with solutions containing different nutrient availability. The grass shoots were cut every 30 days to determine the productivity and N, P and K contents in the plant tissue. Models of productivity and the extraction capacity of each nutrient were obtained as a function of the nutrient concentration. Based on the results obtained, it was verified that the productivity of shoot dry biomass and the extractions of N, P and K by the Vetiver grass increased linearly with the nutrient availability of the nutritive solution. In relation to Tifton 85, quadratic models of productivity and N and K extraction were adjusted. The maximum productivity, N, P and K extraction by Vetiver grass were 513.4, 8.2, 1.9 and 10.39 g mmonth, respectively. In relation to Tifton 85 grass, these values were 739.4, 30.8, 3.0 and 15.59 g mmonth for productivity, N, P and K extraction, respectively.
本研究旨在评估在水平潜流人工湿地（HSSF-CWs）中，当多孔介质被不同养分供应水平的溶液饱和时，香根草和梯牧草的地上生物量生产力和氮（N）、磷（P）和钾（K）提取能力。每隔 30 天收割一次草，以确定植物组织中的生产力和 N、P 和 K 含量。根据获得的结果，验证了香根草地上生物量生产力和 N、P 和 K 的提取量与营养液的养分供应线性增加。与梯牧草 85 相比，生产力和 N、K 提取的二次模型进行了调整。香根草的最大生产力、N、P 和 K 提取量分别为 513.4、8.2、1.9 和 10.39 g mmonth。而对于梯牧草 85 草，这些值分别为 739.4、30.8、3.0 和 15.59 g mmonth 的生产力、N、P 和 K 提取。
