naa a22 4500 510752721 CHVBK 20180411083110.0 cr unu---uuuuu 180411e20131101xx s 000 0 eng 10.1007/s11270-013-1763-2 doi (NATIONALLICENCE)springer-10.1007/s11270-013-1763-2 The Increased Contribution of Atmospheric Nitrogen Deposition to Nitrogen Cycling in a Rural Forested Area of Kyushu, Japan [Elektronische Daten] [Masaaki Chiwa, Tsutomu Enoki, Naoko Higashi, Tomo'omi Kumagai, Kyoichi Otsuki] Japan has been receiving increasing levels of atmospheric nitrogenous pollutants from the East Asian continent over the last few decades, so it is critical to evaluate the impact of this increased atmospheric nitrogen (N) deposition on N cycling even in rural forests. This study evaluated the contribution of the current level of atmospheric N deposition to N cycling in a rural forested area. Bulk precipitation and stream water were collected during 2007-2011 at the Shiiba Research Forest (SRF) located in the central Kyushu mountain range of southern Japan. Litterfall was also collected to investigate the contribution of atmospheric N deposition to total N input (litterfall N + atmospheric N deposition). The results showed that atmospheric depositions of both nitrate (NO3 −) and ammonium (NH4 +) were a few times higher during 2009-2011 than in 1991. This could be the result of additional N deposition from the increased long-range transport of nitrogenous pollutants from the East Asian continent. The current level of annual N deposition (9.7kgNha−1year−1) at the SRF was comparable with that at many urban sites and was close to the reported threshold values causing N saturation in forest ecosystems. Although current atmospheric N deposition was an important component (23%) of total N input (43kgNha−1year−1) at the SRF, the concentrations of NO3 − in stream water were consistently low (<10μmolL−1). These results indicate that atmospheric N deposition is currently largely incorporated into forest ecosystems without excess N export from forested watersheds. Springer Science+Business Media Dordrecht, 2013 Atmospheric N deposition nationallicence Rural forest nationallicence N cycling nationallicence Long-range transport nationallicence East Asia nationallicence Chiwa Masaaki Kyushu University Forest, Kyushu University, 394 Tsubakuro, 811-2415, Sasaguri, Fukuoka, Japan aut Enoki Tsutomu Kyushu University Forest, Kyushu University, 394 Tsubakuro, 811-2415, Sasaguri, Fukuoka, Japan aut Higashi Naoko Kyushu University Forest, Kyushu University, 394 Tsubakuro, 811-2415, Sasaguri, Fukuoka, Japan aut Kumagai Tomo'omi Hydrospheric Atmospheric Research Center, Nagoya University, Furo-cho, Chikusa-ku, 464-8601, Nagoya, Aichi, Japan aut Otsuki Kyoichi Kyushu University Forest, Kyushu University, 394 Tsubakuro, 811-2415, Sasaguri, Fukuoka, Japan aut Water, Air, & Soil Pollution Springer Netherlands 224/11(2013-11-01), 1-8 0049-6979 224:11<1 2013 224 11270 https://doi.org/10.1007/s11270-013-1763-2 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11270-013-1763-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Chiwa Masaaki Kyushu University Forest, Kyushu University, 394 Tsubakuro, 811-2415, Sasaguri, Fukuoka, Japan aut NATIONALLICENCE 700 1- Enoki Tsutomu Kyushu University Forest, Kyushu University, 394 Tsubakuro, 811-2415, Sasaguri, Fukuoka, Japan aut NATIONALLICENCE 700 1- Higashi Naoko Kyushu University Forest, Kyushu University, 394 Tsubakuro, 811-2415, Sasaguri, Fukuoka, Japan aut NATIONALLICENCE 700 1- Kumagai Tomo'omi Hydrospheric Atmospheric Research Center, Nagoya University, Furo-cho, Chikusa-ku, 464-8601, Nagoya, Aichi, Japan aut NATIONALLICENCE 700 1- Otsuki Kyoichi Kyushu University Forest, Kyushu University, 394 Tsubakuro, 811-2415, Sasaguri, Fukuoka, Japan aut NATIONALLICENCE 773 0- Water, Air, & Soil Pollution Springer Netherlands 224/11(2013-11-01), 1-8 0049-6979 224:11<1 2013 224 11270 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer