Eucalypt plantation effects on organic carbon and aggregation of three different-textured soils in Brazil
Yuri L. Zinn A B D , Rattan Lal A and Dimas V. S. Resck C
+ Author Affiliations
- Author Affiliations
A Carbon Management and Sequestration Center, The Ohio State University, 2021 Coffey Road, Columbus, OH 43210-1085, USA.
B Departamento de Ciência do Solo, Universidade Federal de Lavras, Lavras, MG 37200 000, Brazil.
C Embrapa Cerrados, Planaltina, DF 73301-970, Brazil.
D Corresponding author. Email: ylzinn@dcs.ufla.br
Soil Research 49(7) 614-624 https://doi.org/10.1071/SR11264
Submitted: 14 March 2011 Accepted: 12 October 2011 Published: 17 November 2011
Abstract
Short-cycle (~7 years) tropical eucalypt plantations can sequester much carbon (C) in biomass, but their impact on soil organic C (SOC) varies considerably according to soil properties. Three Oxisols (sandy, loamy, and clayey) under 14-year-old eucalypt (Eucalytus camaldulensis Dehnh.) coppice stands and native cerrado vegetation were sampled to a depth of 1 m, in order to assess whether soil texture controls SOC response to afforestation in central Brazil. Both SOC concentration and stocks were proportional to contents of clay+silt to 1 m depth, with no effect of eucalypt plantation. However, there was a 40% decrease in water-stable aggregates of 2–8 mm size in all soils under eucalypt stands in the 0–0.05 m depth, which probably helped to release occluded particulate organic matter (POM) into free POM. In the 0–0.05 m depth, SOC partition throughout particle-size fractions (sand, silt, and clay) was unaltered in the loamy and clayey Oxisols, whereas in the sandy Oxisol, clay-bound SOC strongly decreased simultaneously with a strong increase in free POM. As free POM is often more susceptible to decay than clay-bound SOC, this change suggests a higher susceptibility to SOC change in sandy soils. Soil respiration in the 0–0.05 m depth was more strongly correlated with the mean weight diameter and clay+silt contents than with SOC and nitrogen concentrations, with no effect of eucalypt plantation. In conclusion, soil texture affects total SOC retention and soil respiration, with little or no effect of eucalypt plantation. However, decreased aggregation and lower POM occlusion occurred in all soils planted with eucalyptus, suggesting that SOC levels in eucalypt plantations can be better conserved with less intensive soil preparation practices, especially in coarse-textured soils.
Additional keywords: carbon partitioning, carbon storage in soil, forest soils, soil respiration.
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