Input of seabird-derived nitrogen into rice-paddy fields near a breeding/roosting colony of the Great Cormorant (Phalacrocorax carbo), and its effects on wild grass

Kentaro Kazama*, Hirotatsu Murano, Kazuhide Tsuzuki, Hidenori Fujii, Yasuaki Niizuma, Chitoshi Mizota

*この研究の対応する著者

研究成果: Article査読

9 被引用数 (Scopus)

抄録

Terrestrial ecosystems near breeding/roosting colonies of piscivorous seabirds can receive a large amount of marine-derived N in the form of bird feces. It has been well demonstrated that N input from seabirds strongly affects plant communities in forests or coastal grasslands. The effects of nutrient input on plant communities in agricultural ecosystems near seabird colonies, however, have rarely been evaluated. This relationship was examined in rice-paddy fields irrigated by a pond system located near a colony of the Great Cormorant Phalacrocorax carbo in Aichi, central Japan. In the present study, spatial variations in N content (N %) and N stable isotope composition (δ15N) of soils and wild grass species together with the growth height of plants in paddy fields in early spring (fallow period) were examined. Soils had a higher N % and δ15N values in fields associated with an irrigation pond that had N input from cormorants. The δ15N values tended to be higher around the inlet of irrigation waters, relative to the outlet. These results indicate that cormorant-derived N was input into the paddy fields via the irrigation systems. Plants growing in soil with higher δ15N had higher δ15N in the above-ground part of the plants and had luxurious growth. A positive correlation in plant height and δ15N of NO3-N was observed in soil plough horizons.

本文言語English
ページ(範囲)128-134
ページ数7
ジャーナルApplied Geochemistry
28
DOI
出版ステータスPublished - 2013 1月
外部発表はい

ASJC Scopus subject areas

  • 環境化学
  • 汚染
  • 地球化学および岩石学

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