A Look at Amazon Basin Seasonal Dynamics with the Biophysical ...
A Look at Amazon Basin Seasonal Dynamics with the Biophysical ... A Look at Amazon Basin Seasonal Dynamics with the Biophysical ...
Effect of labile carbon additions on N 2 O emissions from forest soils inthe southwestern Brazilian AmazonD.C. Garcia-Montiel 1 , J.M. Melillo 1 , P.A. Steudler 1 , C. Neill 1 , C.C. Cerri 2 , B. Feigl 2and M. Piccolo 21 The Ecosystems Center, Marine Biological Laboratory, Woods Hole, MA 02543,USA.2 Centro de Energia nuclear na Agricultura, Avenida Centenário 303, CEP13416000, Piracicaba, SP, Brasil.dgarcia@mbl.edu jmelillo@mbl.edu steudler@mbl.edu cneill@mbl.educerri@cena.usp.br eduardo@cena.usp.br mpiccolo@cena.usp.brThe availability of labile organic carbon for microbial metabolic processes couldbe an important factor regulating N 2 O emissions from tropical soils. Weinvestigated how an increase in labile C affects N 2 O and CO 2 emissions fromforest soils in the southwestern Brazilian Amazon State of Rondônia.Experimental manipulations included the addition of NO - 3 or glucose to field plotsin the forest and of NH + 4 , NO - 3 and/or glucose to laboratory incubations of soils.The addition of labile carbon dramatically increased the emissions N 2 O and CO 2from the forest soils. These results indicate a strong C limitation of forest N 2 Oproduction. In this study and related field observations, we have observed apositive linear correlation between the emissions of N 2 O and CO 2 from forestsoils in Rondônia. We have used this relationship together with our processbasedbiogeochemistry model, the Terrestrial Ecosystem Model (TEM), to predictN 2 O emissions for the Amazon Basin. For the period 1980-1995, we estimateannual basin-wide N 2 O-N emissions of between 0.74 and 0.83 Tg.
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Effect of labile carbon additions on N 2 O emissions from forest soils in<strong>the</strong> southwestern Brazilian <strong>Amazon</strong>D.C. Garcia-Montiel 1 , J.M. Melillo 1 , P.A. Steudler 1 , C. Neill 1 , C.C. Cerri 2 , B. Feigl 2and M. Piccolo 21 The Ecosystems Center, Marine Biological Labor<strong>at</strong>ory, Woods Hole, MA 02543,USA.2 Centro de Energia nuclear na Agricultura, Avenida Centenário 303, CEP13416000, Piracicaba, SP, Brasil.dgarcia@mbl.edu jmelillo@mbl.edu steudler@mbl.edu cneill@mbl.educerri@cena.usp.br eduardo@cena.usp.br mpiccolo@cena.usp.brThe availability of labile organic carbon for microbial metabolic processes couldbe an important factor regul<strong>at</strong>ing N 2 O emissions from tropical soils. Weinvestig<strong>at</strong>ed how an increase in labile C affects N 2 O and CO 2 emissions fromforest soils in <strong>the</strong> southwestern Brazilian <strong>Amazon</strong> St<strong>at</strong>e of Rondônia.Experimental manipul<strong>at</strong>ions included <strong>the</strong> addition of NO - 3 or glucose to field plotsin <strong>the</strong> forest and of NH + 4 , NO - 3 and/or glucose to labor<strong>at</strong>ory incub<strong>at</strong>ions of soils.The addition of labile carbon dram<strong>at</strong>ically increased <strong>the</strong> emissions N 2 O and CO 2from <strong>the</strong> forest soils. These results indic<strong>at</strong>e a strong C limit<strong>at</strong>ion of forest N 2 Oproduction. In this study and rel<strong>at</strong>ed field observ<strong>at</strong>ions, we have observed apositive linear correl<strong>at</strong>ion between <strong>the</strong> emissions of N 2 O and CO 2 from forestsoils in Rondônia. We have used this rel<strong>at</strong>ionship toge<strong>the</strong>r <strong>with</strong> our processbasedbiogeochemistry model, <strong>the</strong> Terrestrial Ecosystem Model (TEM), to predictN 2 O emissions for <strong>the</strong> <strong>Amazon</strong> <strong>Basin</strong>. For <strong>the</strong> period 1980-1995, we estim<strong>at</strong>eannual basin-wide N 2 O-N emissions of between 0.74 and 0.83 Tg.
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