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Investigation:

LC-21 (Asner / Bustamante / Silva)

LBA Dataset ID:

LC21_P_Fractionation

Originator(s):

1. Asner, Gregory Paul
2. Bustamante, Mercedes M.C.
3. Silva, Jose Natalino Macedo
4. Broadbent, Eben North
5. Carlson, Kim
6. Carvalho, Ana Paula Ferreira
      7. Hare, Anna Quinn
8. Knapp, David E.
9. Oliveira, Paulo Jose Silva Costa
10. Prado, Zayra Azeredo
11. Silva, Jose Salomao Oliveira
12. Villagomez, April Marie

Point(s) of Contact:

Asner, Gregory P. (gpa@stanford.edu)
Knapp, David E. (deknapp@stanford.edu)

Dataset Abstract:

This data set contains P fractionation efficiency after a selective logging event. The data are categorized by type of land cover or disturbance. The categories are: Forest, Gap, Skids, Roads, Deck Edges, and Deck Center.
The soil characteristics were determined in March of 2003.
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.
Known Problems: The data file is an Excel spreadsheet containing several worksheets of data. Each worksheet contains stacked sections of data with different headers and different formats. Column headings are abbreviated and undefined. Coded explanations are not provided for coded text fields. No additional information was available to properly document the data file for long-term archive.

Beginning Date:

2003-03-01

Ending Date:

2003-03-01

Metadata Last Updated on:

2011-12-29

Data Status:

Not yet in archive queue

Access Constraints:

Public

Data Center URL:

http://daac.ornl.gov

Distribution Contact(s):

ORNL DAAC User Services (uso@daac.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):

Citation Information - Other Details:

Asner, G.P., L.P. Olander. 2011. LBA-ECO LC-21 Efficiency of P fractionation after Selective Logging in Flona Tapajos, Para, Brazil. Available on-line [http://daac.ornl.gov ] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, U.S.A.

Keywords - Theme:

Parameter Topic Term Source Sensor
BIOMASS DENSITY LAND SURFACE LAND USE/LAND COVER    

Uncontrolled Theme Keyword(s):  BIOMASS, LOGGING, TAPAJOS

Keywords - Place (with associated coordinates):

Region
(click to view profile)
Site
(click to view profile)
North South East West
Para Western (Santarem) Flona Tapajos -2.75000 -3.58333 -54.83333 -55.25000

Related Publication(s):

Asner, G.P., M.M.C. Bustamante, and A.R. Townsend. (2003) Scale dependence of biophysical structure in deforested areas bordering the Tapajos National Forest, Central Amazon. Remote Sensing of Environment 87(4):507-520.

Gregory P. Asner, Alan R. Townsend, Mercedes M. C. Bustamante, Gabriela B. Nardoto and Lydia 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.

Olander, Lydia P., Mercedes M. Bustamante, Gregory P. Asner, Everaldo Telles, Zayra Prado, and Plinio Camargo. Surface soil changes following selective logging in an Eastern Amazon forest. Earth Interactions 9( ):

Data Characteristics (Entity and Attribute Overview):

Data Characteristics:

The data values are in micrograms of phosphorus per kilogram of soil.

Data Application and Derivation:

These data were collected to demonstrate P fractionation efficiency after a selective logging event.

Quality Assessment (Data Quality Attribute Accuracy Report):

Quality Assessment:

These data were reviewed and found to be reasonable and accurate.

Process Description:

Data Acquisition Materials and Methods:

Soil samples were dried at 70 degrees C for 10 days and subsamples were ground and sieved (2 mm) with charcoal and large roots removed. P fractionations were conducted on a subset of samples using a modified Hedley fractionation (Tiessen and Moir 1993, Townsend et al. 2002). Three analytical replicates were used for each sample. In short, the soils were subjected to the following series of extractions: resin strips (in

KCl to flocculate soils); bicarbonate (0.5M NaHCO3); hydroxide (0.1M NaOH); hot concentrated acid (3.6M HCl); and a final peroxide/sulfuric acid digest. This same digest was used on a portion of the bicarbonate, hydroxide, and acid extractions, so that the organic P content could be determined from the total minus the inorganic. We did not include the 1M HCl fraction in our analysis because it mainly contains primary mineral P, which is absent in these highly weathered soils. All samples were analyzed using the Murphy Riley method (Murphy and Riley 1962) using a spectrophotometer (Shimadzu UV-1203). The resin and bicarbonate extractable pools are the most labile, while the hydroxide, concentrated acid, and residual fractions are likely dominated by mineral (Fe or Al) or organic matter complexed P that varies in recalcitrance (Tiessen and Moir 1993, Cross and Schlessinger 1995). An independent measure of total soil P was determined using the peroxide/sulfuric digest on a replicate soil sample. The sum of all fractions was compared to this independent measure to provide a measure of confidence in the fractionation

scheme.

References:

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.



Tiessen, H., and J. O. Moir. 1993. Characterization of available P by sequential extraction. Pages 75-86 in M. R. Carter, editor. Soil Sampling and Methods of Analysis. Lewis Publishers.



Tran, T. S., and R. R. Simard. 1993. Mehlich III - Extractable elements. in M. R. Carter, editor. Soil sampling and methods of analysis. Lewis Publishers, Boca Raton FL.

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