Agricultural and forested land use impacts on floodplain shallow groundwater temperature regime

摘要: Given the importance of groundwater temperature to biogeochemical health aquatic ecosystems, a floodplain study was implemented improve understanding rural land use impacts on shallow (SGW) temperature. Study sites included historic agricultural field (Ag) and bottomland hardwood forest (BHF), each with nine piezometers in an 80 × 80 m grid. Piezometers were equipped pressure transducers monitor SGW level at 30 min intervals during 2011, 2012, 2013, 2014 water years. The is one first utilize long-term, continuous, automated, situ monitoring investigate temperatures. Average period 11.1 11.2 °C Ag BHF sites, respectively. However, range site 72% greater than site. Results indicate responsiveness seasonal climate fluctuations related absence canopy. Patterns intra-site differences both illustrate influence stream–aquifer thermal conduction occasional baseflow reversals. Considering similar surface soil amplitudes low average flow values results suggest that contrasting rates plant use, recharge, subsurface hydraulic conductivity are likely mechanistic causes for observed differences. highlight long-term impact removal hydrology regime. Copyright © 2015 John Wiley & Sons, Ltd.