loading page

The latest status of nitrogen saturation on Kureha Hill, Toyama, Japan, based on 20-year observations
  • Miyu Takahashi,
  • Tomonori Kawakami
Miyu Takahashi
Toyama Prefectural University

Corresponding Author:[email protected]

Author Profile
Tomonori Kawakami
Toyama Prefectural University
Author Profile

Abstract

Excessive anthropogenic nitrogen fixation alters the nitrogen cycle and increases nitrogen deposition, leading to nitrogen saturation, which leads to forest decline and nitrate leakage into stream waters. Kureha Hill in Toyama Prefecture, Japan, is considered to be in nitrogen saturation, since many streams have contained high concentrations of nitrate for more than 20 years. This study verified the latest status of nitrogen saturation by comparing the latest data with 20-year observational data. Results showed that the current nitrate concentration in stream water is lower than that observed 20 years ago. However, the C/N ratio of the soil between 12 and 18, indicates that nitrogen saturation could take place. In addition, the net nitrogen mineralization and net nitrification rate showed no significant change from the past data. Based on the nitrogen leakage to the stream water, Kureha Hill’s nitrogen saturation was found to be less intense; however, its potential to produce nitrate has been unchanged for 20 years.
29 Sep 2023Submitted to Ecological Research
04 Oct 2023Assigned to Editor
04 Oct 2023Submission Checks Completed
04 Oct 2023Review(s) Completed, Editorial Evaluation Pending
16 Oct 2023Reviewer(s) Assigned