Institute of Agricultural Sciences, Federal University of Jequitinhonha and Mucuri Valleys, Unaí, MG, Brazil.
Department of Sanitary and Environmental Engineering, Federal University of Minas Gerais, Belo Horizonte, MG, Brazil.
J Environ Sci Health A Tox Hazard Subst Environ Eng. 2020;55(6):661-668. doi: 10.1080/10934529.2020.1727703. Epub 2020 Feb 18.
Estimation of the Crop Evapotranspiration () in Horizontal Subsurface Flow Constructed Wetlands (HSSF-CWs) is of great importance for hydrological modeling of these systems. The objective of this work was to obtain the Crop Coefficient () values of Vetiver () and Tifton 85 ( spp.) grasses when grown in HSSF-CWs whose porous medium was saturated with solutions containing different nutrients concentrations. The water balance was performed every day in order to determine the of the grasses. It was verified that the values of the Vetiver grass were independent of the nutrient availability, expressed in terms of Electrical Conductivity (EC) of the nutrient solution. The value in the initial growth phase (Phase I) was 0.99, independent of the seasons. In Phase II, the were 0.95 and 1.36 for autumn and spring, respectively, and for Phase III were 1.12 in autumn and 1.60 in spring. In relation to the Tifton 85 grass, the values showed a quadratic behavior as a function of the EC, where the estimation models were obtained by the cluster analysis in Phase II and III. For Phase I, the value was 1.17, independent of the EC and the time of year.
估算水平潜流人工湿地 (HSSF-CWs) 的作物需水量 () 对于这些系统的水文建模非常重要。本工作的目的是获得在多孔介质中饱和含有不同养分浓度溶液的 HSSF-CWs 中生长的香根草和梯牧草的作物系数 () 值。为了确定草的需水量，每天进行水量平衡。结果表明，香根草的 值与养分供应无关，以养分溶液的电导率 (EC) 表示。在初始生长阶段 (阶段 I) 的 值为 0.99，与季节无关。在阶段 II 中，秋季和春季的 值分别为 0.95 和 1.36，而在阶段 III 中，秋季的值为 1.12，春季的值为 1.60。关于梯牧草， 值表现为 EC 的二次函数关系，其中通过聚类分析获得了阶段 II 和 III 的 值估计模型。在阶段 I 中， 值为 1.17，与 EC 和季节无关。
