Groundwater nitrate response to sustainable nitrogen management

Throughout the world, nitrogen (N) losses from intensive agricultural production may end up as undesirably high concentrations of nitrate in groundwater with a long-term impact on groundwater quality. This has human and environmental health consequences, due to the use of groundwater as a drinking water resource, and causes eutrophication of groundwater-dependent ecosystems such as wetlands, rivers and near-coastal areas. At national scale, the measured nitrate concentrations and trends in Danish oxic groundwater in the last 70 years correlate well with the annual agricultural N surpluses. We also show that the N use efficiency of agriculture is related to the groundwater nitrate concentrations. We demonstrate an inverted U-shape of annual nitrate concentrations as a function of economic growth from 1948 to 2014. Our analyses evidence a clear trend of a reversal at the beginning of the 1980s towards a more sustainable agricultural N management. This appears to be primarily driven by societal demand for groundwater protection linked to economic prosperity and an increased environmental awareness. However, the environmental and human health thresholds are still exceeded in many locations. Groundwater protection is of fundamental global importance, and this calls for further development of environmentally and economically sustainable N management in agriculture worldwide.

[1]  E. Davidson,et al.  Nutrients in the nexus , 2016, Journal of Environmental Studies and Sciences.

[2]  D. Postma,et al.  Nitrate Reduction in an Unconfined Sandy Aquifer: Water Chemistry, Reduction Processes, and Geochemical Modeling , 1991 .

[3]  M. Bartoli,et al.  Origin and fate of nitrates in groundwater from the central Po plain: Insights from isotopic investigations , 2013 .

[4]  Lisbeth Flindt Jørgensen,et al.  Groundwater monitoring in Denmark: characteristics, perspectives and comparison with other countries , 2009 .

[5]  B. Nolan,et al.  Nitrate in groundwater in the United States , 2009 .

[6]  J. Rockström,et al.  Response to Comment on “Planetary boundaries: Guiding human development on a changing planet” , 2015, Science.

[7]  Allison M. Leach,et al.  The nitrogen footprint of food products and general consumption patterns in Austria , 2014 .

[8]  A. Tiktak,et al.  Evaluation of the Dutch implementation of the nitrates directive, the water framework directive and the national emission ceilings directive , 2016 .

[9]  F. Chapin,et al.  A safe operating space for humanity , 2009, Nature.

[10]  Martin S. Andersen,et al.  Discharge of nitrate-containing groundwater into a coastal marine environment , 2007 .

[11]  J. Olesen,et al.  Policies for agricultural nitrogen management—trends, challenges and prospects for improved efficiency in Denmark , 2014 .

[12]  S. Carpenter,et al.  Planetary boundaries: Guiding human development on a changing planet , 2015, Science.

[13]  E. Davidson,et al.  Managing nitrogen for sustainable development , 2015, Nature.

[14]  CAS-No.  Common Implementation Strategy for the Water Framework Directive and its , 2003 .

[15]  T. Panayotou.  Economic Growth and the Environment , 2000 .

[16]  E. Cowling,et al.  The Nitrogen Cascade , 2003 .

[17]  Tommy Dalgaard,et al.  Nitrogen footprints: Regional realities and options to reduce nitrogen loss to the environment , 2017, Ambio.

[18]  S. Reed,et al.  Biological nitrogen fixation: rates, patterns and ecological controls in terrestrial ecosystems , 2013, Philosophical Transactions of the Royal Society B: Biological Sciences.

[19]  J. Pekel,et al.  High-resolution mapping of global surface water and its long-term changes , 2016, Nature.

[20]  Alain Dassargues,et al.  Identification of groundwater quality trends in a chalk aquifer threatened by intensive agriculture in Belgium , 2007 .

[21]  S. Wisely.  Grand challenge for the 21st century , 2010 .

[22]  B. Kronvang,et al.  Threshold values and management options for nutrients in a catchment of a temperate estuary with poor ecological status , 2012 .

[23]  B. Nolan,et al.  Nitrate in groundwater of the United States, 1991-2003. , 2010, Environmental science & technology.

[24]  W. Winiwarter,et al.  How a century of ammonia synthesis changed the world , 2008 .

[25]  T. Dalgaard,et al.  Trend reversal of nitrate in Danish groundwater--a reflection of agricultural practices and nitrogen surpluses since 1950. , 2011, Environmental science & technology.

[26]  P. Engesgaard,et al.  Decadal variations in groundwater quality: A legacy from nitrate leaching and denitrification by pyrite in a sandy aquifer , 2017 .

[27]  J. Olesen,et al.  Farm nitrogen balances in six European landscapes as an indicator for nitrogen losses and basis for improved management , 2012 .

[28]  T. Dalgaard,et al.  Regional analysis of groundwater nitrate concentrations and trends in Denmark in regard to agricultural influence , 2012 .

[29]  Richard T. Conant,et al.  Patterns and trends in nitrogen use and nitrogen recovery efficiency in world agriculture , 2013 .

[30]  Josette Garnier,et al.  Nitrogen as a threat to European water quality , 2011 .

[31]  L. N. Plummer,et al.  Use of chlorofluorocarbons (CCl3F and CCl2F2) as hydrologic tracers and age‐dating tools: The alluvium and terrace system of central Oklahoma , 1992 .

[32]  J. Galloway,et al.  Transformation of the Nitrogen Cycle: Recent Trends, Questions, and Potential Solutions , 2008, Science.

[33]  S. Carpenter,et al.  Solutions for a cultivated planet , 2011, Nature.

[34]  Andrea Viezzoli,et al.  Nitrate reduction in geologically heterogeneous catchments--a framework for assessing the scale of predictive capability of hydrological models. , 2014, The Science of the total environment.

[35]  M. Rupert.  Decadal-scale changes of nitrate in ground water of the United States, 1988-2004. , 2008, Journal of environmental quality.

[36]  T. Sonnenborg,et al.  Nitrate vulnerability assessment of aquifers , 2016, Environmental Earth Sciences.

[37]  G. Chow,et al.  Environmental Kuznets Curve: Conclusive Econometric Evidence for , 2014 .

[38]  D. Silverman,et al.  Nitrate from Drinking Water and Diet and Bladder Cancer Among Postmenopausal Women in Iowa , 2016, Environmental health perspectives.

[39]  M. Rhein,et al.  The Bremen mass spectrometric facility for the measurement of helium isotopes, neon, and tritium in water , 2009, Isotopes in environmental and health studies.

[40]  T. Dalgaard,et al.  Developments In The Nitrogen Surplus And The Fossil Energy Use InDanish Agriculture During The 20th Century , 2003 .

[41]  Eric A Davidson,et al.  More food, low pollution (mo fo lo Po): a grand challenge for the 21st century. , 2015, Journal of environmental quality.

[42]  K. Belitz,et al.  Assessment of regional change in nitrate concentrations in groundwater in the Central Valley, California, USA, 1950s–2000s , 2013, Environmental Earth Sciences.

[43]  V. Moreno,et al.  Colorectal cancer risk and nitrate exposure through drinking water and diet , 2016, International journal of cancer.

[44]  Allison M. Leach,et al.  First approach to the Japanese nitrogen footprint model to predict the loss of nitrogen to the environment , 2014 .

[45]  M. Bierkens,et al.  Demonstrating trend reversal of groundwater quality in relation to time of recharge determined by 3H/3He. , 2007, Environmental pollution.

[46]  D. K. Solomon,et al.  An advanced passive diffusion sampler for the determination of dissolved gas concentrations , 2009 .