| 要旨トップ | 目次 | 日本生態学会第63回全国大会 (2016年3月、仙台) 講演要旨
ESJ63 Abstract


一般講演(口頭発表) E1-07 (Oral presentation)

Effects of phosphorus and nEffects of phosphorus and nitrogen addition on CO2, CH4, and N2O fluxes with and without root exclusion in tropical lowland forests in Mt. Kibnabalu, Borneo

*Taiki Mori, Daiki Yokoyama, Kanehiro Kitayama

Previous studies reported that N addition on P-limited ecosystems emitted more N2O than on N-limited ecosystems or NP-limited ecosystems, because P-limited ecosystems can hold a lower amount of the added N into microbial N pool. To test if this phenomenon occurs in other areas, we examined the effects of N and P additions on N2O emissions in two lowland dipterocarp forests with different strength of P-limitations on Mt. Kinabalu, Borneo. Root excluded areas were also prepared in each sub-plot to estimate root N uptakes. In contrast with previous reports, the same amount of N addition caused higher N2O emissions in less P-limited forest. Microbial N pools were not affected by N addition in both forests. These results were probably because N requirement by trees was higher in more severely P-limited forest. Root N uptakes were higher in more severely P-limited forest, and higher amount of N remained in soil in less P-limited forest. In the ecosystems on Mt. Kinabalu, P-limitation would drive N-limitation through constrained free-living N2 fixation, lower N turnover, and higher N consumption for producing phosphatase, resulting in more N-starved condition.


日本生態学会