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  Folha Amazônica


ND-08 (McNabb / Costa)

LBA Dataset ID:



1. McNabb, Ken
      2. Beldini, Troy

Point(s) of Contact:

McNabb, Ken (

Dataset Abstract:

Eucalyptus grandis and other clonal plantations cover about 3.5 million ha in Brazil. Long-term sustainability of these plantation systems is probably in part linked to maintenance of soil organic matter and good soil structure and aggregation, especially in areas with low-fertility soils.This study investigated soil aggregate dynamics on a clay soil and a sandy soil, each with a Eucalyptus plantation and an adjacent primary forest. Silvicultural management did not reduce total C stocks, and did not change soil bulk density. Aggregates of the managed soils did not decrease in mass as hypothesized, which indicates that soil cultivation in 6 year cycles did not cause large decreases in soil aggregation in either soil texture. Silt, clay, and C of the sandy plantation soil shifted to greater aggregate protection, which may represent a decrease in C availability. The organic matter in the clay plantation soil increased in the fractions considered less protected while this shift from C to structural forms considered more protected was not observed.

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Ending Date:


Metadata Last Updated on:


Data Status:

Not yet in archive queue

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Data Center URL:

Distribution Contact(s):

ORNL DAAC User Services (

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Data Access:

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Citation Information - Other Details:

Beldini, T.P. and K. McNabb. 2013. LBA-ECO ND-08 Soil Respiration and Soil Fractions, Jari Plantations, Para, Brazil. Data set. Available on-line [] from LBA Data and Information System, National Institute for Space Research (INPE/CPTEC), Cachoeira Paulista, Sao Paulo, Brazil.

Keywords - Theme:

Parameter Topic Term Source Sensor

Uncontrolled Theme Keyword(s):  soil characteristics, soil fractions, soil respiration

Keywords - Place (with associated coordinates):

(click to view profile)
(click to view profile)
North South East West
Para Eastern (Belem) Jari Celulose -0.86000 -0.86000 -52.55000 -52.55000

Related Publication(s):

Beldini. T.P., K.L. McNabb, B.G. Lockaby, F.G.Sanchez,O. Navegantes-Cancio and R. Cosme de Oliveira. 2009. The Effect of Plantation Silviculture on Soil Organic Matter and Particle-size Fractions in Amazonia. Revista Brasileira de Ciencias de Solo, 33:1593-1602

The effect of Amazonian Eucalyptus plantations on soil aggregates and organic matter density fractions

Data Characteristics (Entity and Attribute Overview):

Data Characteristics:

<pre>Data are provided as three comma-delimited ASCII files:

Data Application and Derivation:

These data were collected to address the effects of plantation forestry on soil bulk density, aggregation and carbon storage. The study design also allows for an analysis of how soil texture influences the impact of plantation management on soils.

Quality Assessment (Data Quality Attribute Accuracy Report):

Quality Assessment:

Not provided.

Process Description:

Data Acquisition Materials and Methods:


This project was conducted on the property of Jari Celulose, Monte Dourado, Para, Brazil where 55 000 ha of Eucalyptus spp. (Jari, 2009) are harvested on approximately 6 year rotations to produce bleached kraft pulp for international and domestic sales (McNabb & Wadauski, 1999). The local climate is classified as Amw – hot and humid in the Koppen system. The annual rainfall average is 2115 mm, with a dry season from September to November. The average annual temperature is 26.4 degrees C varying less than 2 degrees monthly. The natural vegetation is tropical ombrophilous lowland forest (UNESCO, 1973).

This study investigated identical properties of a clayey Oxisol (Haplustox) and a sandy Ultisol (Hapludult).

The initial clearing of native forest for plantations began in 1968. Each site was converted from native forest using slash and burn methods, in 1971 for the sandy site and 1988 for the clay one. Site preparation methods included burning, root removal, soil ripping and sub-soiling. Seedlings were hand

planted in planting beds, and came from clonally propagated stock that was matched to the specific conditions at each site. Each study site had a plantation and adjacent primary forest within 5 m. Field surveys, soil maps and aerial photographs were used to choose these sites. Within each site,

relief, slope, soil parent material and texture were uniform.

Eight sample plots of 100 m2 (10 m by 10 m) were established on each soil texture, four in the plantation and four in the native forest. Soil samples were taken from four randomly selected locations within each plot during July 2001. Sampling was done using a bucket auger. Soil samples were collected at 0–20 and 30–50 cm depths and bulked across samples within a plot. A 2 kg composite sample was

taken from each depth after thorough mixing in the field.

After sampling, soil samples for all analyses were immediately transported to the laboratory where sub-samples of all soils were dried at 105 degrees C to determine moisture content. The soil samples were stored at field moisture in sealed plastic bags at 4 degrees C and analysed within 2 weeks of field sampling.

Aggregate size classes were isolated according to the protocol described by Cambardella & Elliot (1994). The entire field-moist soil sample was passed through a 2.8-mm sieve and then a sub-sample was taken to determine the gravimetric moisture content. The soil moisture content of each soil sample used in the fractionation procedure was adjusted to a common level following Elliott & Cambardella (1991). The initial 100 g oven-dry equivalent sample used in the wet-sieving procedure was capillary-wetted overnight at 4 degrees C while resting on pre-rinsed Whatman filter paper to bring the sample to field capacity. Following capillary wetting, the sample was gently immersed in 500 mL of deionized water and placed on the sieving apparatus. The sample was then wet-sieved through a series of three nested sieves to obtain two aggregate fractions: (1) 250–2000 micons (small macro-aggregates (SMAG)), and (2) 53–250 microns (micro-aggregates (MIAG)). The sieving apparatus was a RoTap model RX-29 (W.S Tyler, Salisbury, NC, USA) without the tapping action of the hammer arm. The sieving cycle was 2 min, with a water flow rate of 1750 mL per min. Each of the fractions was dried overnight at 50 degrees C and weighed. C and N in aggregates were determined through dry combustion analysis on a Perkin-Elmer 2400 series II CHNS�O analyser (Perkin-Elmer, Norwalk, CT, USA). The mass of the

aggregate fraction is the percent of dry soil from an oven-dry equivalent of 100 g of field-moist soil. C and N contents were calculated based on the oven-dry equivalent mass of the aggregate fraction and its C or N concentration, and aggregate masses were corrected for sand content as described by Elliott et al. (1991).


Elliott, E.T. & Cambardella, C.A. 1991. Physical separation of soil

organic matter. Agriculture Ecosystems & Environment, 34, 407–419.

Elliott, E.T., Palm, C.A., Reuss, D.E. & Monz, C.A. 1991. Organic matter contained in soil aggregates from a tropical chronosequence: correction for sand and light fraction. Agriculture, Ecosystems and Environment, 34, 443–451.

McNabb, K.L. & Wadauski, L. 1999. Multiple rotation yields for

intensively managed plantations in the Amazon basin. New

Forests, 18, 5–15.

UNESCO. The Unesco international classification system and mapping of vegetation, 1973. Access under: http:// Access date: Dec. 10, 2008.


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