Low nitrogen retention in a Japanese cedar plantation in a suburban area, western Japan

Ru Yang, Masaaki Chiwa

研究成果: Contribution to journalArticle査読

1 被引用数 (Scopus)

抄録

This study aimed to evaluate nitrogen (N) leaching from Japanese cedar, the main plantation species in Japan, in response to elevated atmospheric N deposition. N leaching and possible factors, including soil nitrification, tree N uptake, and topographic steepness, were evaluated in mature (64–69 year) Japanese cedar trees planted on steep slopes (25°–40°) and neighboring Japanese oak plantations in suburban forests, which served as reference sites. N fertilization (50 kg N ha−1 year−1 as ammonium nitrate) was conducted to evaluate the response of N leaching to an elevated inorganic N pool in the surface soil. The soil water nitrate (NO3) concentration below the rooting zone in the Japanese cedar forest (607 ± 59 μmol L−1) was much higher than that in the Japanese oak plantations (8.7 ± 8.1 μmol L−1) and increased immediately after fertilization, indicating high N leaching from the Japanese cedar plantations. The relatively low N uptake by Japanese cedar planted on the steep slopes could be an important contributor to the high N leaching. This study highlights the importance of vegetation composition for managing the water quality in headwater streams from forest ecosystems disturbed by atmospheric N deposition.

本文言語英語
論文番号5335
ジャーナルScientific reports
11
1
DOI
出版ステータス出版済み - 12 2021

All Science Journal Classification (ASJC) codes

  • 一般

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