Akiyama H, Yan X, Yagi K (2006) Estimations of emission factors for fertilizer-induced direct N2O emissions from agricultural soils in Japan: summary of available data. Soil Sci Plant Nutr 52:774–787. doi:10.1111/j.1747-0765.2006.00097.x
Article
Google Scholar
Arai S, Ishizuka S, Ohta S et al (2008) Potential N2O emissions from leguminous tree plantation soils in the humid tropics. Global Biogeochem Cycles 22:1–9. doi:10.1029/2007GB002965
Article
Google Scholar
Arias-Navarro C, Díaz-Pinés E, Klatt S et al (2017) Spatial variability of soil N2O and CO2 fluxes in different topographic positions in a tropical mountain forest in Kenya. J Geophys Res Biogeosci 122:514–527. doi:10.1002/2016JG003667
Article
Google Scholar
Blackie JR, Edwards KA (1979) General conclusions from the land use experiments in East Africa. East Afr Agric For J 43:273–277. doi:10.1080/00128325.1979.11662968
Google Scholar
Borken W, Matzner E (2009) Reappraisal of drying and wetting effects on C and N mineralization and fluxes in soils. Glob Chang Biol 15:808–824. doi:10.1111/j.1365-2486.2008.01681.x
Article
Google Scholar
Bouwman AF, Boumans LJM, Batjes NH (2002) Emissions of N2O and NO from fertilized fields: summary of available measurement data. Global Biogeochem Cycles. doi:10.1029/2001GB001811
Google Scholar
Breuer L, Papen H, Butterbach-Bahl K (2000) N2O emission from tropical forest soils of Australia. J Geophys Res 105:26353. doi:10.1029/2000JD900424
Article
Google Scholar
Breuer L, Kiese R, Butterbach-Bahl K (2002) Temperature and moisture effects on nitrification rates in tropical rain-forest soils. Soil Sci Soc Am J 66:834. doi:10.2136/sssaj2002.8340
Article
Google Scholar
Brumme R (1995) Mechanisms of carbon and nutrient release and retention in beech forest gaps. Plant Soil 2:593–600
Article
Google Scholar
Butterbach-Bahl K, Kock M, Willibald G et al (2004) Temporal variations of fluxes of NO, NO2, N2O, CO2, and CH4 in a tropical rain forest ecosystem. Global Biogeochem Cycles. doi:10.1029/2004gb002243
Google Scholar
Butterbach-Bahl K, Kahl M, Mykhayliv L et al (2009) A European-wide inventory of soil NO emissions using the biogeochemical models DNDC/Forest-DNDC. Atmos Environ 43:1392–1402. doi:10.1016/j.atmosenv.2008.02.008
Article
Google Scholar
Butterbach-Bahl K, Baggs E, Dannenmann M et al (2013) Nitrous oxide emissions from soils: how well do we understand the processes and their controls? Philos Trans R Soc Lond B Biol Sci 368:20130122. doi:10.1098/rstb.2013.0122
Article
Google Scholar
Castaldi S, Bertolini T, Valente A et al (2013) Nitrous oxide emissions from soil of an African rain forest in Ghana. Biogeosci Discuss 9:16565–16588. doi:10.5194/bgd-9-16565-2012
Article
Google Scholar
Chameides WL, Fehsenfeld F, Rodgers MO et al (1992) Ozone precursor relationships in the ambient atmosphere. J Geophys Res 97:6037. doi:10.1029/91JD03014
Article
Google Scholar
Conrad R (1996) Soil microorganisms as controllers of atmospheric trace gases (H2, CO, CH4, OCS, N2O, and NO). Microbiol Rev 60:609–640
Google Scholar
Davidson EA (1992) Sources of nitric oxide and nitrous oxide following wetting of dry soil. Soil Sci Soc Am J 56:95–102. doi:10.2136/sssaj1992.03615995005600010015x
Article
Google Scholar
Davidson EA, Kingerlee W (1997) A global inventory of nitric oxide emissions from soils. Nutr Cycl Agroecosystems 48:37–50. doi:10.1023/A:1009738715891
Article
Google Scholar
Davidson EA, Verchot LV (2000) Testing the hole in the pipe model of nitric and nitrous oxide emission from soils using the TRAGNET database. Global Biogeochem Cycles 14:1035–1042
Article
Google Scholar
Davidson EA, Vitousek PM, Riley R et al (1991) Soil emissions of nitric oxide in a seasonally dry tropical forest of Mexico. J Geophys Res Atmos. doi:10.1029/91JD01476
Google Scholar
Davidson EA, Keller M, Erickson HE et al (2000a) Testing a conceptual model of soil emissions of nitrous and nitric oxides. Bioscience 50:667. doi:10.1641/0006-3568(2000)050[0667:TACMOS]2.0.CO;2
Article
Google Scholar
Davidson EA, Verchot LV, Cattanio JH, Ackerman IL (2000b) Effects of soil water content on soil respiration in forests and cattle pastures of eastern Amazonia. Biogeochemistry 48:53–69. doi:10.1023/A:1006204113917
Article
Google Scholar
Farquharson R, Baldock J (2008) Concepts in modelling N2O emissions from land use. Plant Soil 309:147–167. doi:10.1007/s11104-007-9485-0
Article
Google Scholar
Fu XQ, Li Y, Su WJ et al (2012) Annual dynamics of N2O emissions from a tea field in southern subtropical China. Plant, Soil Environ 58:373–378
Article
Google Scholar
Garcia-Montiel DC, Steudler PA, Piccolo MC et al (2001) Controls on soil nitrogen oxide emissions from forests and pastures in the Brazilian Amazon. Global Biogeochem Cycles 15:1021–1030
Article
Google Scholar
Garcia-Montiel DC, Steudler PA, Piccolo M et al (2003) Nitrogen oxide emissions following wetting of dry soils in forest and pastures in Rondônia, Brazil. Biogeochemistry 64:319–336. doi:10.1023/A:1024968802018
Article
Google Scholar
Gharahi Ghehi N, Werner C, Hufkens K et al (2014) N2O and NO emission from the Nyungwe tropical highland rainforest in Rwanda. Geoderma Reg 2–3:41–49. doi:10.1016/j.geodrs.2014.09.008
Article
Google Scholar
Government of Kenya (2010) Rehabilitation of the Mau Forest Ecosystem. A project concept prepared by the Interim Coordinating Secretariat, Office of the Prime Minister, on behalf of the Government of Kenya
Gut A, Van Dijk SM, Scheibe M et al (2002) NO emission from an Amazonian rain forest soil: continuous measurements of NO flux and soil concentration. J Geophys Res D Atmos 107:1–10. doi:10.1029/2001JD000521
Google Scholar
Gütlein A, Zistl-Schlingmann M, Becker JN et al (2016) Nitrogen turnover and greenhouse gas emissions in a tropical alpine ecosystem, Mt. Kilimanjaro, Tanzania. Plant Soil. doi:10.1007/s11104-016-3029-4
Google Scholar
Han W, Xu J, Wei K et al (2013) Estimation of N2O emission from tea garden soils, their adjacent vegetable garden and forest soils in eastern China. Environ Earth Sci 70:2495–2500. doi:10.1007/s12665-013-2292-4
Article
Google Scholar
IPCC (2007) Climate change 2007: The Physical Science Basis. Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge University Press, Geneva.
IPCC (2014) Climate Change 2014: synthesis report. Contribution of Working Groups I, II and III to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge University Press, Geneva.
Ishizuka S, Tsuruta H, Murdiyarso D (2002) An intensive field study on CO2, CH4, and N2O emissions from soils at four land-use types in Sumatra, Indonesia. Global Biogeochem Cycles. doi:10.1029/2001GB001614
Google Scholar
IUSS Working Group WRB (2015) World reference base for soil resources 2014, update 2015 International soil classification system for naming soils and creating legends for soil maps. Rome
Jaetzold R, Schmidt H, Hornetz B, Shisanya C (2010) Farm management handbook of Kenya Part II/B. In: Farm management handbook of Kenya, 2nd ed. Ministry of Agriculture, Kenya, in Cooperation with the German Agency for Technical Cooperation (GTZ), Nairobi, p 739
Johansson C, Rodhe H, Sanhueza E (1988) Emission of NO in a tropical savanna and a cloud forest during the dry season. J Geophys Res Res 93:7180–7192
Article
Google Scholar
Kahle D, Wickham H (2013) ggmap: Spatial visualization with ggplot2. R J 5:144–161. doi:10.1023/A:1009843930701
Google Scholar
Keller M, Reiners WA (1994) Soil-atmosphere exchange of nitrous oxide, nitric oxide, and methane under secondary succession of pasture to forest in the Atlantic lowlands of Costa Rica. Global Biogeochem Cycles 8:399–409. doi:10.1029/94GB01660
Article
Google Scholar
Keller M, Veldkamp E, Weitz AM, Reiners WA (1993) Effect of pasture age on soil trace-gas emissions from a deforested area of Costa Rica. Nature 365:244–246
Article
Google Scholar
Kenya Human Rights Commision (KHRC) (2008) A comparative study of the tea sector in Kenya. A case study of large scale tea estates. http://resource.khrc.or.ke:8181/khrc/handle/123456789/15?show=full
Kesik M, Blagodatsky S, Papen H, Butterbach-Bahl K (2006) Effect of pH, temperature and substrate on N2O, NO and CO2 production by Alcaligenes faecalis p. J Appl Microbiol 101:655–667. doi:10.1111/j.1365-2672.2006.02927.x
Article
Google Scholar
Kim D-G, Thomas AD, Pelster D et al (2016) Greenhouse gas emissions from natural ecosystems and agricultural lands in sub-Saharan Africa: synthesis of available data and suggestions for further research. Biogeosciences 13:4789–4809. doi:10.5194/bg-13-4789-2016
Article
Google Scholar
Koehler B, Corre MD, Veldkamp E et al (2009) Immediate and long-term nitrogen oxide emissions from tropical forest soils exposed to elevated nitrogen input. Glob Chang Biol 15:2049–2066. doi:10.1111/j.1365-2486.2008.01826.x
Article
Google Scholar
Krhoda GO (1988) The impact of resource utilization on the hydrology of the Mau Hills forest in Kenya. Mt Res Dev 8:193–200. doi:10.2307/3673447
Article
Google Scholar
Li C, Frolking S, Butterbach-Bahl K (2005) Carbon sequestration in arable soils is likely to increase nitrous oxide emissions, offsetting reductions in climate radiative forcing. Clim Change 72:321–338. doi:10.1007/s10584-005-6791-5
Article
Google Scholar
Li Y, Fu X, Liu X et al (2013) Spatial variability and distribution of N2O emissions from a tea field during the dry season in subtropical central China. Geoderma 193:1–12. doi:10.1016/j.geoderma.2012.10.008
Article
Google Scholar
Liang LL, Grantz DA, Jenerette GD (2015) Multivariate regulation of soil CO2 and N2O pulse emissions from agricultural soils. Glob Chang Biol . doi:10.1111/gcb.13130
Google Scholar
Ludwig J, Meixner FX, Vogel B, Forstner J (2001) Soil-air exchange of nitric oxide: an overview of processes, environmental factors, and modeling studies. Biogeochemistry 52:225–257. doi:10.1023/a:1006424330555
Article
Google Scholar
Matson PA, Vitousek PM, Livingston GP, Swanberg NA (1990) Sources of variation in nitrous oxide flux from Amazonian ecosystems. J Geophys Res 95:16789. doi:10.1029/JD095iD10p16789
Article
Google Scholar
Medinets S, Skiba U, Rennenberg H, Butterbach-Bahl K (2015) A review of soil NO transformation: associated processes and possible physiological significance on organisms. Soil Biol Biochem 80:92–117. doi:10.1016/j.soilbio.2014.09.025
Article
Google Scholar
Melillo JM, Steudler PA, Feigl BJ et al (2001) Nitrous oxide emissions from forests and pastures of various ages in the Brazilian Amazon. J Geophys Res 106:179–188
Article
Google Scholar
Milder J, Moroge M, Shames S (2015) Operationalizing climate-smart agricultural landscapes: the case of a tea- producing landscape in Kericho, Kenya. In: Minang PA, van Noordwijk M, Freeman OE et al (eds) Climate-smart landscapes: multifunctionality in practice. World Agroforestry Centre (ICRAF), Nairobi, pp 319–333
Google Scholar
Monroy L, Mulinge W, Witwer M (2013) Analysis of incentives and disincentives for tea in Kenya. Technical notes series
Müller AK, Matson AL, Corre MD, Veldkamp E (2015) Soil N2O fluxes along an elevation gradient of tropical montane forests under experimental nitrogen and phosphorus addition. Front Earth Sci 3:1–12. doi:10.3389/feart.2015.00066
Article
Google Scholar
Mutugi M, Kiiru W (2015) Biodiversity, local resource, national heritage, regional concern, and global impact: the case of Mau Forest, Kenya. Eur Sci J 1:681–692
Google Scholar
Neff JC, Keller M, Holland EA et al (1995) Fluxes of nitric oxide from soils following the clearing and burning of a secondary tropical rain forest. J Geophys Res 100:25913. doi:10.1029/95JD02027
Article
Google Scholar
Nobre AD, Keller M, Crill PM, Harriss RC (2001) Short-term nitrous oxide profile dynamics and emissions response to water, nitrogen and carbon additions in two tropical soils. Biol Fertil Soils 34:363–373. doi:10.1007/s003740100396
Article
Google Scholar
Nottingham AT, Turner BL, Whitaker J et al (2015) Soil microbial nutrient constraints along a tropical forest elevation gradient: a belowground test of a biogeochemical paradigm. Biogeosciences 12:6071–6083. doi:10.5194/bg-12-6071-2015
Article
Google Scholar
Omumbo JA, Lyon B, Waweru SM et al (2011) Raised temperatures over the Kericho tea estates: revisiting the climate in the East African highlands malaria debate. Malar J 10:12. doi:10.1186/1475-2875-10-12
Article
Google Scholar
Otter LB, Yang WX, Scholes MC, Meixner FX (1999) Nitric oxide emissions from a southern African savanna. J Geophys Res Atmos 104:18471–18485. doi:10.1029/1999JD900148
Article
Google Scholar
Pape L, Ammann C, Nyfeler-Brunner A et al (2009) An automated dynamic chamber system for surface exchange measurement of non-reactive and reactive trace gases of grassland ecosystems. Biogeosciences 6:405–429. doi:10.5194/bg-6-405-2009
Article
Google Scholar
Pihlatie MK, Christiansen JR, Aaltonen H et al (2013) Comparison of static chambers to measure CH4 emissions from soils. Agric For Meteorol 171–172:124–136. doi:10.1016/j.agrformet.2012.11.008
Article
Google Scholar
Pilegaard K (2013) Processes regulating nitric oxide emissions from soils. Philos Trans R Soc L B Biol Sci 368:20130126. doi:10.1098/rstb.2013.0126
Article
Google Scholar
Potting J, Bakkes J (2004) The GEO-3 scenarios 2002–2032: quantification and analysis of environmental impacts. UNEP/DEWA/RS.03-4 and RIVM 402001022. Division
Pumpanen J, Kolari P, Ilvesniemi H et al (2004) Comparison of different chamber techniques for measuring soil CO2 efflux. Agric For Meteorol 123:159–176
Article
Google Scholar
Purbopuspito J, Veldkamp E, Brumme R, Murdiyarso D (2006) Trace gas fluxes and nitrogen cycling along an elevation sequence of tropical montane forests in Central Sulawesi, Indonesia. Glob Biogeochem Cycles 20:1–11. doi:10.1029/2005GB002516
Article
Google Scholar
Raich JW, Potter CS, Bhagawati D (2002) Interannual variability in global soil respiration, 1980–1994. Glob Chang Biol 8:800–812. doi:10.1046/j.1365-2486.2002.00511.x
Article
Google Scholar
R Core Team (2016) R: a language and environment for statistical computing. R Foundation for Statistical Computing. Vienna, Austria. http://www.R-project.org/
Riley RH, Vitousek PM, Ecology S, Jan N (1995) Nutrient dynamics and nitrogen trace gas flux during ecosystem development in montane rain forest. Ecology 76:292–304
Article
Google Scholar
Rosenstock T, Mpanda M, Pelster D et al (2015) Greenhouse gas fluxes from agricultural soils of Kenya and Tanzania. J Geophys Res Biogeosciences 121:707–723. doi:10.1002/2016JG003341
Google Scholar
Saiz G, Green C, Butterbach-Bahl K et al (2006) Seasonal and spatial variability of soil respiration in four Sitka spruce stands. Plant Soil 287:161–176. doi:10.1007/s11104-006-9052-0
Article
Google Scholar
Serca D, Delmas R, Jambert C, Labroue L (1994) Emissions of nitrogen oxides from equatorial rain forest in central Africa: origin and regulation of NO emission from soils. Tellus 46:243–254
Article
Google Scholar
Smith KA (1990) Anaerobic zones and denitrification in soil: modelling and measurement. In: Revsbech NP, Sørensen J (eds) Denitrification in soil and sediment. Springer, Boston, pp 229–244
Chapter
Google Scholar
Spiess A-N (2014) Propagate: propagation of uncertainty. R package version 1.0-4. http://CRAN.R-project.org/package=propagate
Stehfest E, Bouwman L (2006) N2O and NO emission from agricultural fields and soils under natural vegetation: summarizing available measurement data and modeling of global annual emissions. Nutr Cycl Agroecosystems 74:207–228. doi:10.1007/s10705-006-9000-7
Article
Google Scholar
Tang X, Liu S, Zhou G et al (2006) Soil-atmospheric exchange of CO2, CH4, and N2O in three subtropical forest ecosystems in southern China. Glob Chang Biol 12(546):560. doi:10.1111/j.1365-2486.2006.01109.x
Google Scholar
Tokuda S, Hayatsu M (2004) Nitrous oxide flux from a tea field amended with a large amount of nitrogen fertilizer and soil environmental factors controlling the flux. Soil Sci Plant Nutr 50:365–374. doi:10.1080/00380768.2004.10408490
Article
Google Scholar
UNEP (2012) The role and contribution of montane forests and related ecosystem services to the Kenyan economy
van Dijk SM (2002) Biogenic NO emissions from forest and pasture soils: relating laboratory studies to field measurements. J Geophys Res 107:8058. doi:10.1029/2001JD000358
Article
Google Scholar
van Lent J, Hergoualc HK, Verchot LV (2015) Reviews and syntheses: soil N2O and NO emissions from land use and land-use change in the tropics and subtropics: A meta-analysis. Biogeosciences 12:7299–7313. doi:10.5194/bg-12-7299-2015
Article
Google Scholar
Veldkamp E, Davidson E, Erickson H et al (1999) Soil nitrogen cycling and nitrogen oxide emissions along a pasture chronosequence in the humid tropics of Costa Rica. Soil Biol Biochem 31:387–394. doi:10.1016/S0038-0717(98)00141-2
Article
Google Scholar
Venterea RT, Groffman PM, Verchot LV et al (2003) Nitrogen oxide gas emissions from temperate forest soils receiving long-term nitrogen inputs. Glob Chang Biol 9:346–357. doi:10.1046/j.1365-2486.2003.00591.x
Article
Google Scholar
Verchot LV, Davidson EA, Cattfinio JH et al (1999) Land use change and biogeochemical controls of nitrogen oxide emissions from soils in eastern Amazonia. Global Biogeochem Cycles 13:31–46. doi:10.1029/1998GB900019
Article
Google Scholar
Wang Y, Wang H, Wang ZL et al (2014) Effect of litter layer on soil-atmosphere N2O flux of a subtropical pine plantation in China. Atmos Environ 82:106–112. doi:10.1016/j.atmosenv.2013.10.028
Article
Google Scholar
Werner C, Kiese R, Butterbach-Bahl K (2007) Soil-atmosphere exchange of N2O, CH4, and CO2 and controlling environmental factors for tropical rain forest sites in western Kenya. J Geophys Res 112:D03308. doi:10.1029/2006JD007388
Article
Google Scholar
Wieder WR, Cleveland CC, Townsend AR (2011) Throughfall exclusion and leaf litter addition drive higher rates of soil nitrous oxide emissions from a lowland wet tropical forest. Glob Chan Biol 17:3195–3207. doi:10.1111/j.1365-2486.2011.02426.x
Article
Google Scholar
Yamamoto A, Akiyama H, Naokawa T et al (2014) Lime-nitrogen application affects nitrification, denitrification, and N2O emission in an acidic tea soil. Biol Fertil Soils 50:53–62. doi:10.1007/s00374-013-0830-6
Article
Google Scholar
Yao Z, Wolf B, Chen W et al (2010) Spatial variability of N2O, CH4 and CO2 fluxes within the Xilin River catchment of Inner Mongolia, China: a soil core study. Plant Soil 331:341–359. doi:10.1007/s11104-009-0257-x
Article
Google Scholar
Yao Z, Wei Y, Liu C et al (2015) Organically fertilized tea plantation stimulates N2O emissions and lowers NO fluxes in subtropical China. Biogeosciences 12:5915–5928. doi:10.5194/bg-12-5915-2015
Article
Google Scholar
Zheng X, Han S, Huang Y et al (2004) Re-quantifying the emission factors based on field measurements and estimating the direct N2O emission from Chinese croplands. Global Biogeochem Cycles 18:1–19. doi:10.1029/2003GB002167
Article
Google Scholar
Zhou Z, Jiang L, Du E et al (2013) Temperature and substrate availability regulate soil respiration in the tropical mountain rainforests, Hainan Island, China. J Plant Ecol 6:325–334. doi:10.1093/jpe/rtt034
Article
Google Scholar
Zuazo P (2016) Development of a fully automated soil incubation and gas sampling system for quantifying trace gas emission pulses from soils at high temporal resolution. Dissertation, Albert-Ludwigs-Universität Freiburg im Breisgau, Germany