NOTICE -- The LBA-ECO Project website is no longer being supported.  This archive is a snapshot, as it existed in 2013, of the LBA-ECO website, maintained by NASA Goddard Space Flight Center, and now archived at the ORNL DAAC.  Links to external websites may be inactive. Final data products from the LBA project can be found at the ORNL DAAC.
banner
banner banner banner banner banner banner
banner banner banner banner banner banner banner
home aboutlibrarynews archivecontacts banner

spacer
banner
Investigations
Overview
Abstracts & Profiles
Publications
Research Sites
Meetings
Synthesis Groups
LBA-HYDROMET
LBA-Air-ECO
Logistics
Overview
Field Support
Travel
Visa
Shipping
Data
  Overview
Find LBA Data
Investigator Checklist
Process & Policy
Documentation & Archive
Training & Education
  Overview
Activities Summary
T&E Goals
Student Opportunities
  Folha Amazônica
 
spacer

Investigation:

ND-10 (Townsend / Asner / Bustamante)

LBA Dataset ID:

ND10_SOIL_CHEMISTRY

Originator(s):

1. ASNER, G.P.
2. TOWNSEND, A.R.
      3. BUSTAMANTE, M.M.C.

Point(s) of Contact:

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

Dataset Abstract:

Soil chemical properties from two pasture chronosequences, one on clayey soils and the other on sandy soils from six pastures to the east of the Flona-Tapajos, South of Santarem, Para, Central Brazilian Amazon. Data were collected by: Alan R. Townsend (University of Colorado) Gregory P. Asner (Carnegie Institution) Mercedes M.M.C. Bustamante (Universidade de Brasilia)
Data Quality Statement: The Data Center has determined that this data set has missing or incomplete data, metadata, or other documentation resulting in diminished usability of this product. User beware.

Beginning Date:

1997-08-01

Ending Date:

1997-08-31

Metadata Last Updated on:

2013-07-01

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-10 Soil Properties of Pasture Chronosequences, Para, Brazil: 1997 :  http://daac.ornl.gov/cgi-bin/dsviewer.pl?ds_id=1171

Documentation/Other Supporting Documents:

LBA-ECO ND-10 Soil Properties of Pasture Chronosequences, Para, Brazil: 1997 :  http://daac.ornl.gov/LBA/guides/ND10_Soil_Chemistry.html

Citation Information - Other Details:

Asner, G.P., A.R. Townsend, and M.M.C. Bustamante. 2013. LBA-ECO ND-10 Soil Properties of Pasture Chronosequences, Para, Brazil: 1997. Data set. Available on-line [http://daac.ornl.gov] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, USA http://dx.doi.org/10.3334/ORNLDAAC/1171

Keywords - Theme:

Parameter Topic Term Source Sensor
BULK DENSITY BIOSPHERE SOILS FIELD INVESTIGATION ANALYSIS
CARBON BIOSPHERE SOILS LABORATORY ANALYSIS
PHOSPHATE BIOSPHERE SOILS LABORATORY AUTOANALYZER
SOIL CHEMISTRY BIOSPHERE SOILS FIELD INVESTIGATION ANALYSIS
SOIL TEXTURE BIOSPHERE SOILS FIELD INVESTIGATION ANALYSIS

Uncontrolled Theme Keyword(s):  PASTURE CHEMISTRY, SOIL CHEMISTRY, SOIL NITROGEN, SOIL ORGANIC CARBON, SOIL PHOSPHORUS

Keywords - Place (with associated coordinates):

Region
(click to view profile)
Site
(click to view profile)
North South East West
  PARA WESTERN (SANTAREM) -3.13330 -3.26660 -54.66600 -54.93300

Related Publication(s):

Asner, G.P., A.R. Townsend, M.M.C. Bustamante, G.B. Nardoto, and L.P. Olander. (2004) Pasture degradation in the central Amazon: linking changes in carbon and nutrient cycling with remote sensing. Global Change Biology 10(5):844-862.

Asner, G.P., Townsend, A.R., and Bustamante, M.M.C. 1999. Spectrometry of pasture condition and biogeochemistry in the Central Amazon. Geophysical Research Letters 26(17): 2769-2772.

Townsend, A.R., G.P. Asner, C.C. Cleveland, M.E. Lefer, and M.M.C. Bustamante. (2002) Unexpected changes in soil phosphorus dynamics along pasture chronosequences in the humid tropics. Journal of Geophysical Research-Atmospheres 107(D20)

Data Characteristics (Entity and Attribute Overview):

Data Characteristics:

Data are currently available as two ASCII csv files:

ND10_tapajos_pasture_soil_chemistry.csv

ND10_tapajos_pasture_P_fraction_summary.csv



File organization and contents are as follows:

File #1

Filename: ND10_tapajos_pasture_soil_chemistry.csv,,,,,,,,,,,,,,,,,,,

File date: 16-Apr-13,,,,,,,,,,,,,,,,,,

Associated LBA Dataset ID: ND10_Soil_Chemistry,,,,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,,,

Col.,Column heading,Units/format,Variable description,,,,,,,,,,,,,,,,

----1,Soil_order,,Soil order either Oxisol or Entisol,,,,,,,,,,,,,,,,

----2,Age,y,Age of the pasture at the time of sampling in years,,,,,,,,,,,,,,,,

----3,Sand,%,Percent of soil mass classified as sand particles,,,,,,,,,,,,,,,,

----4,Silt,%,Percent of soil mass classified as silt particles,,,,,,,,,,,,,,,,

----5,Clay,%,Percent of soil mass classified as clay particles,,,,,,,,,,,,,,,,

----6,pH,,Soil pH,,,,,,,,,,,,,,,,

----7,Total_C_conc,%,Mean soil carbon concentration reported in percent (%). Total C was determined on a combustion reduction elemental analyzer.,,,,,,,,,,,,,,,,

----8,Total_C_stderr,,Standard error of the mean soil C concentration , N of 10 samples per site ,,,,,,,,,,,,,,,,

----9,Total_N_conc,%,Mean soil nitrogen concentration reported in percent (%). Total N was determined on a combustion reduction elemental analyzer.,,,,,,,,,,,,,,,,

---10,Total_N_stderr,,Standard error of the mean soil N concentration , N of 10 samples per site ,,,,,,,,,,,,,,,,

---11,Total_P_conc,ug/g,Mean soil phosphorus concentration reported in micrograms P per gram of soil (ug/g). Total P was determined using a sulfuric acid digest see methods for details,,,,,,,,,,,,,,,,

---12,Total_P_stderr,ug/g,Standard error of the mean soil P concentration , N of 10 samples per site ,,,,,,,,,,,,,,,,

---13,Bulk_density,g/cm3,Soil bulk density reported in grams per centimeter cubed (g/cm3),,,,,,,,,,,,,,,,

---14,Total_C_pool,kg/m2,Mean soil carbon pool in the 0 to 10 cm depth calculated from measured soil C concentration (Col 5) and bulk density (Col 8) and reported in kilograms carbon per meter squared (kg/m2),,,,,,,,,,,,,,,,

---15,Total_N_pool,kg/m2,Mean soil nitrogen pool in the 0 to 10 cm depth calculated from measured soil N concentration (Col 7) and bulk density (Col 8) and reported in kilograms nitrogen per meter squared (kg/m2),,,,,,,,,,,,,,,,

---16,Total_P_pool,g/m2,Mean soil phosphorus pool in the 0 to 10 cm depth calculated from measured soil P concentration and bulk density (Col 8) and reported in grams phosphorus per meter squared (kg/m2),,,,,,,,,,,,,,,,



Sample data for File #1

Soil_order,Age,Sand,Silt,Clay,pH,Total_C_conc,Total_C_stderr,Total_N_conc,Total_N_stderr,Total_P_conc,Total_P_stderr,Bulk_density,Total_C_pool,Total_N_pool,Total_P_pool,,,,

Oxisol,2,37,3,60,5.3,4.35,0.1,0.32,0.02,173.8,14.8,1.2,5.2,0.4,20.9,,,,

Oxisol,7,39,2,59,5.4,2.28,0.04,0.19,0.01,135.8,6.7,1.5,2.7,0.2,16.3,,,,

...

Entisol,7,92,2,5,5.6,1.54,0.2,0.09,0.04,52.3,4.3,1.4,2.2,0.1,7.5,,,,

Entisol,15,91,4,5,5.3,1.4,0.04,0.08,0.01,45.2,2.1,1.4,2,0.1,6.5,,,,



File #2

Filename: ND10_tapajos_pasture_P_fractions.csv,,,,

\'File date:,16-Apr-13,,,

Associated LBA Dataset ID: ND10_Soil_Chemistry,,,,

,,,,

Column,Column_heading,Units/format,Explanation,

----1,Soil,,Soil order,

----2,Age,years,Pasture age in years at the time of sampling,

----3,P_fraction,,Name of the fraction labeled according to extractant in the modified Hedley technique: Pi indicates inorganic P and Po organic P ,

----4,Mean_conc,ug per g,Concentration of P reported in micrograms P per gram of soil (ug per g),

----5,Std_err_conc,ug per g,Standard error of the mean concentration reported in micrograms of P per gram of soil (ug per g). N= 8 for all,

,,,,



Sample data for File #2

Soil,Age,P_fraction,Mean_conc,Std_err_conc

Oxisol,2,Resin_Pi,8.6,3.5

Oxisol,2,Bicarb_Pi,2.9,1.7

Oxisol,2,Bicarb_Po,4.7,0.9

Oxisol,2,1M_HCl,8,2.9

Oxisol,2,NaOH_Pi,25.5,9.1

....

Entisol,15,conc_HCl_Pi,6.9,0.3

Entisol,15,conc_HCl_Po,3,0.4

Entisol,15,Residual,9.6,0.8

Entisol,15,Sum of fractions,39.6,1.5

Data Application and Derivation:

These data were to analyze the effects of pasture development on different soil types in the Amazon and to better understand biogeochemical dynamics in these environments.

Quality Assessment (Data Quality Attribute Accuracy Report):

Quality Assessment:

Data presented here were published but no information on detection limits and/or quality control measures were given.

Process Description:

Data Acquisition Materials and Methods:

Sites



The field sites comprised two pasture chronosequences located on ranches south of Santarem, Para and the Amazon River, and east of the Tapajos River. Mean annual rainfall is 2000mm, most of which occurs between January and May, and mean annual temperature is 25 degrees C. All sites are on upland terra firme that has pockets of relic depositional surfaces, creating a mix of clay-rich Oxisols and highly sandy Entisols (Parrotta et al., 1995; Silver et al., 2000). We established one chronosequence of pastures on the Oxisols dating 2, 7, and 15 years since conversion at the start of the study, and the other chronosequence (1, 7, and 15 years since conversion) on the sandy Entisols. Three of the sites (1 year Entisol, 2 years and 7 years Oxisols) were dominated by the common pasture grass Brachyaria brizantha; the other three sites were dominated by another common grass, Pennesetum clandestinum. All pastures were formed from primary forest.



All but the two youngest pasture sites had been burned since conversion as a means for controlling woody pioneer species, with one post-clearing burn in

each of the two 7-year old pastures, and two such burns in the two oldest pastures. Cattle stocking rates ranged from 0.25 and 0.5 head of cattle ha~1 yr~1,

which is low but typical of the central Amazon basin (Dias-Filho et al., 2001). Topographic relief at all sites is minimal, and none of the pastures have been fertilized. All soil collections were conducted along randomly selected 100m transects within each pasture.



Methods

During the first field campaign (August 1997), 10 soil samples per site were collected from 0 to 10 cm depth along random intervals within 100m transects. Soils were air dried, sieved at 2 mm, and transported to the University of Brasilia, Brazil. Bulk density was determined using an excavation method in which the volume of removed soil is measured by replacing it with a known volume of sand, and the soil removed is dried and weighed. Sub-samples for total organic C and N were ground to a fine powder and analyzed using a

combustion reduction elemental analyzer (CE Elantech, Inc., Lakewood, NJ, USA). Total P analyses were performed by digesting 5 g of sieved, air-dried soil in

H2SO4 and H2O2 (Parkinson & Allen, 1975); the digested solution was then analyzed for phosphate concentrations using a flow-injection autoanalyzer (OI

Analytical, Inc.). Modified-Hedley-P fractions were determined according to methods described in Tiessen & Moir (1993) and Townsend et al. (2002). Because higher bulk densities are often found in increasingly older pastures due to soil compaction, total soil values for all elements in pasture sites were adjusted as described by Veldkamp (1994).

References:

Dias-Filho MB, Davidson EA, de Carvalho CJR (2001) Biogeochemical cycles in Amazonian pastures. In: The Biogeochemistry of the Amazon Basin (eds McClain ME, Victoria RL, Ritchey JE),Oxford University Press, New York, pp. 9–23.





Parkinson JA, Allen SE (1975) A wet oxidation process suitable for the determination of nitrogen and mineral nutrients in biological materials. Communications in Soil Science and Plant Analysis, 6, 1–11.



Parrotta JA, Francis JK, de Almeida RR (1995) Trees of the Tapajos. Technical Report IITF-1, US Forest Service.





Silver WL, Neff J, McGroddy M et al. (2000) Effects of soil texture on belowground carbon and nutrient storage in a lowland Amazonian forest ecosystem. Ecosystems, 3, 193–209.





Tiessen H, Moir JO (1993) Characterization of available P by sequential extraction. In: Soil Sampling and Methods of Analysis (ed. Carter MR), Lewis, Boca Raton, FL, pp. 56–73.





Townsend AR, Asner GP, Cleveland CC et al. (2002) Unexpected changes in soil phosphorus dynamics following forest-topasture conversion in the humid tropics. Journal of Geophysical Research, 107, 8067–8076.



Veldkamp E (1994) Organic carbon turnover in three tropical soils under pasture after deforestation. Soil Science Society of America Journal, 58, 175–180.

Skip navigation linksHOME | ABOUT | LIBRARY | NEWS ARCHIVE | CONTACTS | INVESTIGATIONS | LOGISTICS | DATA |TRAINING & EDUCATION

NASA logo
ORNL DAAC
Get Acrobat Reader