Abstract
High nitrogen, especially ammonium, input has been observed in Shichinohe, Aomori Prefecture, northeastern Japan. The monitoring study on soil and soil solution has been carried out to determine soil acidification status since 1996. Soils and soil solutions in Minamitonai and Haginosawa are not strongly acidic. Fluctuations in nitrate concentrations coincided with sodium (Na+) or calcium (Ca2+). Produced protons due to nitrification were exchanged with Ca2+ or neutralized by weathering process. Exchangeable Ca2+ accumulated in surface layers, particular in the older Japanese cedar (Cryptomeria japonica) stand (42 years old). Exchangeable Ca2+ affected soil solution chemistry and the Ca2+ concentration was significantly higher in the older Japanese cedar stand than that in the younger stand (22 years old). Base cations, especially Ca2+, accumulation prevented soil (solution) acidification in Shichinohe site.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
