Moisture availability Moisture availability constrains soil trace gas constrains soil trace gas fluxes in an eastern fluxes in an eastern Amazonian regrowth forest Amazonian regrowth forest Steel Vasconcelos, Daniel Zarin, Eric Steel Vasconcelos, Daniel Zarin, Eric Davidson, Francoise Ishida, Elisana Santos, Davidson, Francoise Ishida, Elisana Santos, Maristela Araújo, Débora Aragão, Lívia Maristela Araújo, Débora Aragão, Lívia Rangel-Vasconcelos, Francisco Oliveira, Rangel-Vasconcelos, Francisco Oliveira, William McDowell, Claudio Carvalho William McDowell, Claudio Carvalho University of Florida University of Florida Woods Hole Research Center Woods Hole Research Center Instituto de Pesquisa Ambiental da Amaz Instituto de Pesquisa Ambiental da Amazô nia nia Universidade Federal Rural da Amaz Universidade Federal Rural da Amazô nia nia University of New Hampshire University of New Hampshire Embrapa Amaz Embrapa Amazô nia Oriental nia Oriental
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Moisture availability constrains soil trace gas fluxes in an eastern Amazonian regrowth forest Moisture availability constrains soil trace gas fluxes in.
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Moisture availability constrains Moisture availability constrains soil trace gas fluxes in an soil trace gas fluxes in an
Steel Vasconcelos, Daniel Zarin, Eric Davidson, Steel Vasconcelos, Daniel Zarin, Eric Davidson, Francoise Ishida, Elisana Santos, Maristela Araújo, Francoise Ishida, Elisana Santos, Maristela Araújo,
Débora Aragão, Lívia Rangel-Vasconcelos, Francisco Débora Aragão, Lívia Rangel-Vasconcelos, Francisco Oliveira, William McDowell, Claudio CarvalhoOliveira, William McDowell, Claudio Carvalho
University of FloridaUniversity of FloridaWoods Hole Research CenterWoods Hole Research Center
Instituto de Pesquisa Ambiental da AmazInstituto de Pesquisa Ambiental da AmazônianiaUniversidade Federal Rural da AmazUniversidade Federal Rural da Amazôniania
University of New HampshireUniversity of New HampshireEmbrapa AmazEmbrapa Amazônia Orientalnia Oriental
COCO22 ,, NN22OO, and , and CHCH44 greenhouse gases greenhouse gases
NONO precursor of O precursor of O33
Gas production and consumption strongly Gas production and consumption strongly linked to the availability of soil moisturelinked to the availability of soil moisture
Limited understanding of the mechanisms that Limited understanding of the mechanisms that control variation in soil trace gas emissionscontrol variation in soil trace gas emissions
►Rainfall, litterfall, and decomposition Rainfall, litterfall, and decomposition confounding factors in observational studiesconfounding factors in observational studies
►Very few manipulative studies in tropical Very few manipulative studies in tropical forestsforests
IntroductionIntroduction
► Quantify the impacts of Quantify the impacts of soilsoil moisture moisture
availability availability on trace gas fluxes in a regrowth on trace gas fluxes in a regrowth
forest stand in eastern Brazilian Amazoniaforest stand in eastern Brazilian Amazonia
ObjectiveObjective
► Pará State, BrazilPará State, Brazil
► Regrowth forest (13 Regrowth forest (13 years old in 2000)years old in 2000)
► Rainfall = 2540 mmRainfall = 2540 mm
► TTair air = 24 – 27 = 24 – 27 ooCC
► OxisolOxisol
Study areaStudy area
► Treatments = control, irrigation, and litter removalTreatments = control, irrigation, and litter removal► Replicates = 4Replicates = 4► Plot size = 20 m x 20 mPlot size = 20 m x 20 m
► Repeated measure analysisRepeated measure analysis: treatment, : treatment, date, and treatment x date effectsdate, and treatment x date effects
► Contrast analysisContrast analysis: season (wet vs. dry) and : season (wet vs. dry) and treatment within season effectstreatment within season effects
Irrigation increases soil water Irrigation increases soil water availabilityavailability