| 要旨トップ | 本企画の概要 | 日本生態学会第60回全国大会 (2013年3月,静岡) 講演要旨
ESJ60 Abstract


シンポジウム S08-3 (Lecture in Symposium/Workshop)

Impact of snowpack decrease on net nitrogen mineralization and nitrification in forest soil of northern Japan

Hideaki Shibata, Yuko Hasegawa, Tsunehiro Watanabe, Karibu Fukizawa (Hokkaido Univ.)

The decrease in snowpack amplifies soil freeze-thaw cycles and decreases the snowmelt water supply to soil. This study examined how snow decrease affects the N mineralization and nitrification of forest soil in northern Japan by conducting an in situ experimental manipulation of snowpack and laboratory incubation studies of soil with differing moisture, temperature and freeze-thaw magnitude. For the incubation studies, surface mineral soil was collected and incubated using the resin-core method during the winter. In the field, there were two treatments: 50% and 100% snow removal, in addition to control plots. The 100% removal of snowpack significantly increased net N mineralization and marginally decreased the net nitrification in soil with the increase in freeze-thaw cycles. However, the net nitrification rates decreased in spite of the increase in ammonium-N availability. The results indicate that winter climate change, which alters the snowpack regime, would strongly impact N biogeochemistry through the increase in ammonium availability for plants and microbes, whereas it would be unlikely that the nitrate loss from surface soil would be enhanced.


日本生態学会