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Investigation:

ND-02 (Davidson / Stone / Markewitz / Carvalho / Sa / Vieira / Moutinho / Figueiredo)

LBA Dataset ID:

LBA_ND02_SGF_Apeu

Originator(s):

1. DAVIDSON, E.A.
2. DE CARVALHO, C.J.R.
      3. FIGUEIREDO, R.D.O.

Point(s) of Contact:

ORNL DAAC User Services Office Oak Ridge National Laboratory Oak Ridge, Tennessee 37 (ornldaac@ornl.gov)

Dataset Abstract:

This data set reports the results of a study to quantify the effects of moisture and substrate availability on soil trace gas fluxes in a regrowth forest in Eastern Amazonia, Apeu, Para, Brazil, from 1999-2003. The efflux of carbon dioxide (CO2), nitric oxide (NO), nitrous oxide (N2O), and methane (CH4) from soil was measured as a response to (1) increased soil moisture availability during the dry season by irrigation and (2) decreased substrate availability by continuous removal of aboveground litter and compared to (3) untreated control plots. Soil gas fluxes are reported in one comma-separated data file.

Beginning Date:

1999-08-19

Ending Date:

2003-04-19

Metadata Last Updated on:

2009-12-14

Data Status:

Archived

Access Constraints:

PUBLIC

Data Center URL:

http://daac.ornl.gov/

Distribution Contact(s):

ORNL DAAC User Services Office Oak Ridge National Laboratory Oak Ridge, Tennessee 37 (ornldaac@ornl.gov)

Access Instructions:

PUBLIC

Data Access:

IMPORTANT: The LBA-ECO Project website is no longer being supported. Links to external websites may be inactive. Final data products from the LBA project can be found at the ORNL DAAC. Please follow the fair use guidelines found in the dataset documentation when using or citing LBA data.
Datafile(s):

LBA-ECO ND-02 Soil Trace Gas Fluxes in Eastern Amazonia, Para, Brazil: 1999-2003 :  http://daac.ornl.gov/cgi-bin/dsviewer.pl?ds_id=953

Documentation/Other Supporting Documents:

LBA-ECO ND-02 Soil Trace Gas Fluxes in Eastern Amazonia, Para, Brazil: 1999-2003 :  http://daac.ornl.gov/LBA/guides/ND02_Soil_Gas_Flux_Apeu.html

Citation Information - Other Details:

Davidson, E.A., C.J.R. de Carvalho, R.D. Figueiredo. 2009. LBA-ECO ND-02 Soil Trace Gas Fluxes in Eastern Amazonia, Para, Brazil: 1999-2003. Data set. Available on-line [http://daac.ornl.gov] from Oak Ridge National Laboratory Distributed Active Archive Center Oak Ridge, Tennessee, U.S.A. doi:10.3334/ORNLDAAC/953

Keywords - Theme:

Parameter Topic Term Source Sensor
CARBON DIOXIDE FLUX BIOSPHERE TERRESTRIAL ECOSYSTEMS FIELD INVESTIGATION IR CO2 ANALYZER
METHANE FLUX BIOSPHERE TERRESTRIAL ECOSYSTEMS FIELD INVESTIGATION GC-FID (GAS CHROMATOGRAPH/FLAME IONIZATION DETECTOR)
NITRIC OXIDE FLUX BIOSPHERE TERRESTRIAL ECOSYSTEMS FIELD INVESTIGATION CHEMILUMINESCENCE
NITROUS OXIDE FLUX BIOSPHERE TERRESTRIAL ECOSYSTEMS FIELD INVESTIGATION GC-ECD (GAS CHROMATOGRAPH/ELECTRON CAPTURE DETECTOR)

Uncontrolled Theme Keyword(s):  CAPOEIRA, CARBON DIOXIDE, METHANE, NITRIC OXIDE, NITROUS OXIDE, SECONDARY FORESTS

Keywords - Place (with associated coordinates):

Region
(click to view profile)
Site
(click to view profile)
North South East West
  PARA EASTERN (BELEM) -1.31670 -1.31670 -47.95000 -47.95000

Related Publication(s):

Davidson, E.A., C.J.R. de Carvalho, A.M. Figueira, F.Y. Ishida, J.P.H.B. Ometto, G.B. Nardoto, R.T. Saba, S.N. Hayashi, E.C. Leal, I.C.G. Vieira, and L.A. Martinelli. 2007. Recuperation of nitrogen cycling in Amazonian forests following agricultural abandonment. Nature 447(7147):995-998.

Vasconcelos, S.S., D.J. Zarin, M. Capanu, R. Littell, E.A. Davidson, F.Y. Ishida, E.B. Santos, M.M. Araujo, D.V. Aragao, L.G.T. Rangel-Vasconcelos, F.D. Oliveira, W.H. McDowell, and C.J.R. de Carvalho. 2004. Moisture and substrate availability constrain soil trace gas fluxes in an eastern Amazonian regrowth forest. Global Biogeochemical Cycles 18(2). Global Biogeochemical Cycles 18, GB2009, doi:10.1029/2003GB002210

Data Characteristics (Entity and Attribute Overview):

Data Characteristics:

The efflux of carbon dioxide (CO2), nitric oxide (NO), nitrous oxide (N2O), and methane (CH4) from soil was measured as a response to increased soil moisture availability during the dry season by irrigation and decreased substrate availability by continuous removal of aboveground litter and compared to untreated control plots. Soil gas fluxes are reported in one comma-separated data file.



Data File Description: ND02_Soil_Gas_Flux_Apeu.csv



Column Number Heading Description

1 Site Study Site: Apeu

2 Date Sample date (YYYY/MM/DD)

3 Year Sample year (YYYY)

4 Month Sample month (MM)

5 DayofYear Day of Year

6 Treatment_Status Treatment: pre-treatment, post-treatment

7 Treatment Treatment class: Control, Irrigation, Litt.Exc.

[Litt.Exc. = litter exclusion, removal of existing

litter and exclusion of new litter]

8 CO2_Mean Carbon dioxide, mean

9 CO2_Std_Err Carbon dioxide, standard error

10 CO2_Reps Carbon dioxide, number of repetitions

11 CO2_Units Carbon dioxide, measurement units

12 NO_Mean Nitric oxide,mean

13 NO_Std_Err Nitric oxide, standard error

14 NO_Reps Nitric oxide, number of repetitions

15 NO_Units Nitric oxide, measurement units

16 N2O_Mean Nitrous oxide, mean

17 N2O_Std_Err Nitrous oxide, standard error

18 N2O_Reps Nitrous oxide, number of repetitions

19 N2O_Units Nitrous oxide, measurement units

20 CH4_Mean Methane, mean

21 CH4_Std_Err Methane, standard error

22 CH4_Reps Methane, number of repetitions

23 CH4_Units Methane, measurement units



Example data record:

Site,Date,Year,Month,DayofYear,Treatment_Status,Treatment,CO2_Mean,CO2_Std_Err,CO2_Reps,CO2_Units,

NO_Mean,No_Std_Err,NO_Reps,NO_Units,N2O_Mean,N2O_Std_Err,N2O_Reps,N2O_Units,

CH4_Mean,CH4_std_err,CH4_Reps,CH4_Units

Apeu,1999/08/12,1999,8,224,pre-treatment,Irrigation,0.189,0.01,8,g C/m2/h ,

0.442,0.17,8,ng N/cm2/h ,-0.104,0.29,8,ng N/cm2/h ,

-0.945,0.18,8,mg CH4/m2/d

Apeu,1999/08/12,1999,8,224,pre-treatment,Litt.Exc.,0.195,0.03,8,g C/m2/h ,

0.142,0.09,8,ng N/cm2/h ,0.610,0.12,8,ng N/cm2/h ,

-0.903,0.60,8,mg CH4/m2/d

...

Apeu,2003/04/24,2003,4,114,post-treatment,Litt.Exc.,0.580,0.13,8,g C/m2/h ,

0.320,0.16,8,ng N/cm2/h ,0.690,0.41,7,ng N/cm2/h ,

-0.100,0.06,8,mg CH4/m2/d

Apeu,2003/04/24,2003,4,114,post-treatment,Control,0.420,0.07,8,g C/m2/h ,

1.650,0.86,8,ng N/cm2/h ,1.050,0.11,8,ng N/cm2/h ,

0.330,0.16,8,mg CH4/m2/d

Data Application and Derivation:

These results demonstrate significant soil moisture and substrate constraints on soil trace gas emissions, particularly for CO2, and suggest that climate and land-use changes that alter moisture and substrate availability are therefore likely to have an impact on atmosphere chemistry.

Quality Assessment (Data Quality Attribute Accuracy Report):

Quality Assessment:

Measurement quality control procedures are described in Vasconcelos et al.(2004).

Process Description:

Data Acquisition Materials and Methods:

Plots were established in 1999, when the regrowth forest was 12 years old. Each of the 12 plots was 20 x 20 m with a centrally nested 10 x 10 m measurement subplot. Litter was removed in four of the 20 m x 20 m plots. Another four plots were irrigated during the dry season, and the remaining plots were left as an experimental control. To avoid edge effects, all measurements were taken within the center 10 meter x 10 meter of each treatment. These 100 meter square areas were further divided into 2.5 m x 2.5 m subplots, each of which was dedicated to a particular use. Fluxes of N2O, NO, CO2, and CH4 were measured about bi-monthly or quarterly within two of these mini-plots. Treatments began in 2000, after more than one full year of baseline data had been gathered. Two chambers were located in each of two of the subplots of each plot, for a total of eight replicated per treatment type.



Fluxes of nitric oxide (NO) and carbon dioxide (CO2) were measured in the field using dynamic chambers connected to a Scintrex LMA-3 chemiluminescent analyzer and a LICOR 6252 IRGA. Fluxes of N2O and CH4 were measured by filling syringes with gas from static chamber headspace at 10-minute intervals, and analyzing the samples in a laboratory using gas chromatography.

References:

Vasconcelos, S.S., D.J. Zarin, M. Capanu, R. Littell, E.A. Davidson, F.Y. Ishida, E.B. Santos, M.M. Araujo, D.V. Aragao, L.G.T. Rangel-Vasconcelos, F.D. Oliveira, W.H. McDowell, and C.J.R. de Carvalho. 2004. Moisture and substrate availability constrain soil trace gas fluxes in an eastern Amazonian regrowth forest. Global Biogeochemical Cycles 18(2). Global Biogeochemical Cycles 18, GB2009, doi:10.1029/2003GB002210

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