N2O and NO emission from the Nyungwe tropical highland rainforest in Rwanda

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N2O and NO emission from the Nyungwe tropical highland rainforest in Rwanda. / Gharahi Ghehi, N.; Werner, C.; Hufkens, K.; Kiese, R.; Van Ranst, E.; Nsabimana, D.; Wallin, Göran; Klemedtsson, Leif; Butterbach-Bahl, K.; Boeckx, P.

In: Geoderma Regional, Vol. 03-feb, 2014, p. 41-49.

Research output: Contribution to journalArticle

Harvard

Gharahi Ghehi, N, Werner, C, Hufkens, K, Kiese, R, Van Ranst, E, Nsabimana, D, Wallin, G, Klemedtsson, L, Butterbach-Bahl, K & Boeckx, P 2014, 'N2O and NO emission from the Nyungwe tropical highland rainforest in Rwanda', Geoderma Regional, vol. 03-feb, pp. 41-49.

APA

Gharahi Ghehi, N., Werner, C., Hufkens, K., Kiese, R., Van Ranst, E., Nsabimana, D., Wallin, G., Klemedtsson, L., Butterbach-Bahl, K., & Boeckx, P. (2014). N2O and NO emission from the Nyungwe tropical highland rainforest in Rwanda. Geoderma Regional, 03-feb, 41-49.

CBE

Gharahi Ghehi N, Werner C, Hufkens K, Kiese R, Van Ranst E, Nsabimana D, Wallin G, Klemedtsson L, Butterbach-Bahl K, Boeckx P. 2014. N2O and NO emission from the Nyungwe tropical highland rainforest in Rwanda. Geoderma Regional. 03-feb:41-49.

MLA

Vancouver

Gharahi Ghehi N, Werner C, Hufkens K, Kiese R, Van Ranst E, Nsabimana D et al. N2O and NO emission from the Nyungwe tropical highland rainforest in Rwanda. Geoderma Regional. 2014;03-feb:41-49.

Author

Gharahi Ghehi, N. ; Werner, C. ; Hufkens, K. ; Kiese, R. ; Van Ranst, E. ; Nsabimana, D. ; Wallin, Göran ; Klemedtsson, Leif ; Butterbach-Bahl, K. ; Boeckx, P. / N2O and NO emission from the Nyungwe tropical highland rainforest in Rwanda. In: Geoderma Regional. 2014 ; Vol. 03-feb. pp. 41-49.

RIS

TY - JOUR

T1 - N2O and NO emission from the Nyungwe tropical highland rainforest in Rwanda

AU - Gharahi Ghehi, N.

AU - Werner, C.

AU - Hufkens, K.

AU - Kiese, R.

AU - Van Ranst, E.

AU - Nsabimana, D.

AU - Wallin, Göran

AU - Klemedtsson, Leif

AU - Butterbach-Bahl, K.

AU - Boeckx, P.

PY - 2014

Y1 - 2014

N2 - Tropical forest soils are a significant source for N2O and NO. Current estimates of N2O and NO emissions areuncertain due to the limited number of fieldmeasurements and model input data. Furthermore, considerable spatialand temporal variability exists due to variation of soil properties, vegetation characteristics and meteorology.Weused a process-based model (ForestDNDC-tropica) to estimate N2O and NO emissions from the entire (970 km2)tropical highland forest (Nyungwe) in southwestern Rwanda. Scaling these results to that regional level using legacysoil, meteorological and simulated vegetation data we found in most cases agreement between N2O and NOmeasurements and model predictions. Limited agreement was found for acid soils with high clay content and reducedmetals, indicating that abiotic N2O and NO forming processes in acidic soils might be under-represented inthe current ForestDNDC-tropica model. The Nyungwe forest was estimated to emit 439 t N2O-N year?1 (2.8–5.5 kg N2O-N ha?1 year?1) and 244 t NO-N year?1 (0.8–5.1 kg N ha?1 year?1), corroborating previous studies intropical forests and highlighting that also tropical highland rainforest soils are a major source of atmospheric N2Oand NO. The uncertainty for the N2O and NO emission estimates was 153 and 50 t N2O-N year?1 and 36 and 16 tNO-N year?1 considering uncertainty in model input data and annual variability, respectively. The results showedthat soil bulk density and pH were the most influential factors driving spatial variation and model uncertainty. Toimprove global model-based estimates of N2O and NO emission from tropical forest focus should therefore alsobe oriented in delivering more detailed soil and vegetation data.

AB - Tropical forest soils are a significant source for N2O and NO. Current estimates of N2O and NO emissions areuncertain due to the limited number of fieldmeasurements and model input data. Furthermore, considerable spatialand temporal variability exists due to variation of soil properties, vegetation characteristics and meteorology.Weused a process-based model (ForestDNDC-tropica) to estimate N2O and NO emissions from the entire (970 km2)tropical highland forest (Nyungwe) in southwestern Rwanda. Scaling these results to that regional level using legacysoil, meteorological and simulated vegetation data we found in most cases agreement between N2O and NOmeasurements and model predictions. Limited agreement was found for acid soils with high clay content and reducedmetals, indicating that abiotic N2O and NO forming processes in acidic soils might be under-represented inthe current ForestDNDC-tropica model. The Nyungwe forest was estimated to emit 439 t N2O-N year?1 (2.8–5.5 kg N2O-N ha?1 year?1) and 244 t NO-N year?1 (0.8–5.1 kg N ha?1 year?1), corroborating previous studies intropical forests and highlighting that also tropical highland rainforest soils are a major source of atmospheric N2Oand NO. The uncertainty for the N2O and NO emission estimates was 153 and 50 t N2O-N year?1 and 36 and 16 tNO-N year?1 considering uncertainty in model input data and annual variability, respectively. The results showedthat soil bulk density and pH were the most influential factors driving spatial variation and model uncertainty. Toimprove global model-based estimates of N2O and NO emission from tropical forest focus should therefore alsobe oriented in delivering more detailed soil and vegetation data.

KW - ForestDNDC-tropica Nitrous oxide Nitric oxide Sensitivity analysis Tropical forest Acrisols Alisols Cambisols Nyungwe Rwanda

M3 - Article

VL - 03-feb

SP - 41

EP - 49

JO - Geoderma Regional

JF - Geoderma Regional

ER -