Applying linear discriminant analysis to predict groundwater redox conditions conducive to denitrification

摘要

Highlights?LDA provides insights into the physical conditions associated with denitrification.?Denitrification occurs on coastal plains where poorly drained soils are found.?Other indicators are soil carbon content, water table depth, and sediment type.?Hydrological bypassing of denitrifying areas occurs via artificial drainage.AbstractDiffuse nitrate losses from agricultural land pollute groundwater resources worldwide, but can be attenuated under reducing subsurface conditions. In New Zealand, the ability to predict where groundwater denitrification occurs is important for understanding the linkage between land use and discharges of nitrate-bearing groundwater to streams. This study assesses the application of linear discriminant analysis (LDA) for predicting groundwater redox status for Southland, a major dairy farming region in New Zealand. Data cases were developed by assigning a redox status to samples deriv