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Quantifying the contribution of land use to N2O, NO and CO2 fluxes in a montane forest ecosystem of Kenya

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Title Quantifying the contribution of land use to N2O, NO and CO2 fluxes in a montane forest ecosystem of Kenya
 
Creator Arias-Navarro, Cristina
Díaz Pinés, Eugenio
Zuazo, Pablo
Rufino, Mariana C.
Verchot, Louis V.
Butterbach-Bahl, Klaus
 
Subject carbon dioxide
land use
nitric oxide
nitrous oxide
soil
tropical forests
food security
climate change
agriculture
 
Description Increasing demand for food and fibre by the growing human population is driving significant land use (LU) change from forest into intensively managed land systems in tropical areas. But empirical evidence on the extent to which such changes affect the soil-atmosphere exchange of trace gases is still scarce, especially in Africa. We investigated the effect of LU on soil trace gas production in the Mau Forest Complex region, Kenya. Intact soil cores were taken from natural forest, commercial and smallholder tea plantations, eucalyptus plantations and grazing lands, and were incubated in the lab under different soil moisture conditions. Soil fluxes of nitrous oxide (N2O), nitric oxide (NO) and carbon dioxide (CO2) were quantified, and we approximated annual estimates of soil N2O and NO fluxes using soil moisture values measured in situ. Forest and eucalyptus plantations yielded annual fluxes of 0.3–1.3 kg N2O– N ha-1 a-1 and 1.5–5.2 kg NO–N ha-1 a-1. Soils of commercial tea plantations, which are highly fertil- ized, showed higher fluxes (0.9 kg N2O–N ha-1 a-1 and 4.3 kg NO–N ha-1 a-1) than smallholder tea plantations (0.1 kg N2O–N ha-1 a-1 and 2.1 kg NO–N ha-1 a-1) or grazing land (0.1 kg N2O– N ha-1 a-1 and 1.1 kg NO–N ha-1 a-1). High soil NO fluxes were probably the consequence of long-term N fertilization and associated soil acidification, likely promoting chemodenitrification. Our experimental approach can be implemented in understudied regions, with the potential to increase the amount of information on production and consumption of trace gases from soils.
 
Date 2017-07
2017-06-22T14:19:15Z
2017-06-22T14:19:15Z
 
Type Journal Article
 
Identifier Arias-Navarro C, Díaz-Pinés E, Zuazo P, Rufino MC, Verchot LV, Butterbach-Bahl K. 2017. Quantifying the contribution of land use to N2O, NO and CO2 fluxes in a montane forest ecosystem of Kenya. Biogeochemistry 134(1-2):95–114.
0168-2563
https://hdl.handle.net/10568/82559
FP3_EALivestockLED
FP3_NitrogenEstimates
FP3_SAMPLES
https://doi.org/10.1007/s10533-017-0348-3
PII-FP3_EALivestockLED
PII-FP3_NitrogenEstimates
 
Language en
 
Rights Copyrighted; all rights reserved
Limited Access
 
Format p. 95-114
 
Publisher Springer Science and Business Media LLC
 
Source Biogeochemistry