1 College of Natural Resources and Environment, Northwest A&F University, Yangling, China.
2 Department of Agricultural Soil Science, Department of Soil Science of Temperate Ecosystems, Georg-August University of Göttingen, Göttingen, Germany.
3 Agro-Technological Institute, RUDN University, Moscow, Russia.
This letter explains the processes and mechanisms involved in the nitrogen-induced soil acidification causing substantial carbonate losses and subsequent CO2 emissions from Chinese croplands.