Abstract

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 m⁻²month⁻¹, respectively. In relation to Tifton 85 grass, these values were 739.4, 30.8, 3.0 and 15.59 g m⁻²month⁻¹ for productivity, N, P and K extraction, respectively.

抽象的

这项研究的目的是评估香根草和Tifton 85草在水平地下流人工湿地（HSSF）上种植时的茎干生物量生产力以及氮（N），磷（P）和钾（K）的提取能力。 -CWs），其多孔介质被含有不同养分利用率的溶液饱和。每30天割一次草苗，以确定植物组织中的生产力以及N，P和K的含量。获得了每种养分的生产力和提取能力的模型，作为养分浓度的函数。根据获得的结果，证实香根草的干生物量生产率和香根草对氮，磷和钾的提取量随营养液的养分利用率线性增加。关于Tifton 85，调整了生产力和氮，钾提取的二次模型。香根草的最大产量，氮，磷和钾的提取量分别为513.4、8.2、1.9和10.39 gm^-2月^-1。对于Tifton 85草，生产率，N，P和K提取的这些值分别为739.4、30.8、3.0和15.59 gm ^-2 month ^-1。