Fluxes of greenhouse gases from Andosols under coffee in monoculture or shaded by Inga densiflora in Costa Rica

Fluxes of greenhouse gases from Andosols under coffee in monoculture or shaded by Inga densiflora in Costa Rica

The objective of this study was to evaluate the effect of N fertilization and the presence of N2 fixing leguminous trees on soil fluxes of greenhouse gases. For a one year period, we measured soil fluxes of nitrous oxide (N2O), carbon dioxide (CO2) and methane (CH4), related soil parameters (temperature, water-filled pore space, mineral nitrogen content, N mineralization potential) and litterfall in two highly fertilized (250 kg N ha-1 year-1) coffee cultivation: a monoculture (CM) and a culture shaded by the N2 fixing legume species Inga densiflora (CIn). Nitrogen fertilizer addition significantly influenced N2O emissions with 84% of the annual N2O emitted during the post fertilization periods, and temporarily increased soil respiration and decreased CH4 uptakes. The higher annual N2O emissions from the shaded plantation (5.8 ± 0.3 kg N ha-1 year-1) when compared to that from the monoculture (4.3 ± 0.1 kg N ha-1 year-1) was related to the higher N input through litterfall (246 ± 16 kg N ha-1 year-1) and higher potential soil N mineralization rate (3.7 ± 0.2 mg N kg-1 d.w. d-1) in the shaded cultivation when compared to the monoculture (153 ± 6.8 kg N ha-1 year-1 and 2.2 ± 0.2 mg N kg-1 d.w. d-1). This confirms that the presence of N2 fixing shade trees can increase N2O emissions. Annual CO2 and CH4 fluxes of both systems were similar (8.4 ± 2.6 and 7.5 ± 2.3 t C-CO2 ha-1 year-1, -1.1 ± 1.5 and 3.3 ± 1.1 kg C-CH4 ha-1 year-1, respectively in the CIn and CM plantations) but, unexpectedly increased during the dry season.

Authors: Hergoualc'h, K.; Skiba, U.; Harmand, J.M.; Henault, C.

Topic: tropical forests,climate change,forest management,logging effects,ecosystems,livelihoods,small businesses,policy,governance

Publisher: Springer

Publication Year: 2008

ISSN: 0168-2563

Source: Biogeochemistry 89(3): 329-345

DOI: 10.1007/s10533-008-9222-7

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