Changes in soil carbon of pastures after afforestation with mixed species: Sampling, heterogeneity and surrogates

Shaun Cunningham, K.J. Metzeling, Ralph MAC NALLY, Jim THOMSON, Cavagnaro Cavagnaro

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Accurate and efficient estimation of soil C is vital to understanding and monitoring the role of afforestation in C sequestration. Here, we focused on the potential of mixed-species plantings, for which there is negligible information but expanding investment due to their added environmental benefits. We surveyed soil C and N over a representative chronosequence (5–29 years old) of existing plantings, including measurements in the adjacent pastures to account for differences in soil type and land-use history among properties. Vegetation characteristics of the tree plantings were measured to identify potential surrogates for rapid assessment of soil C. Soil C was highly heterogeneous under the plantings and the adjacent pastures, with up to eight cores required to sample adequately a plot of 400 m2. Vegetation surrogates had limited success in predicting soil C after afforestation, with the only strong predictors being tree density and planting age. Three decades of afforestation with mixed species had not led to substantial changes in C concentration or content of the soil. The C:N ratio of soils increased with planting age suggesting that the C becomes more resistant to decomposition after afforestation. Over longer time scales, tree plantings are likely to have larger impacts on the amount and forms of soil C.
Original languageEnglish
Pages (from-to)58-65
Number of pages8
JournalAgriculture, Ecosystems and Environment
Volume158
DOIs
Publication statusPublished - 2012
Externally publishedYes

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afforestation
soil carbon
pasture
pastures
planting
carbon
sampling
soil
tree planting
vegetation
chronosequences
chronosequence
ecosystem services
carbon nitrogen ratio
carbon sequestration
soil type
soil types
land use
decomposition
timescale

Cite this

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title = "Changes in soil carbon of pastures after afforestation with mixed species: Sampling, heterogeneity and surrogates",
abstract = "Accurate and efficient estimation of soil C is vital to understanding and monitoring the role of afforestation in C sequestration. Here, we focused on the potential of mixed-species plantings, for which there is negligible information but expanding investment due to their added environmental benefits. We surveyed soil C and N over a representative chronosequence (5–29 years old) of existing plantings, including measurements in the adjacent pastures to account for differences in soil type and land-use history among properties. Vegetation characteristics of the tree plantings were measured to identify potential surrogates for rapid assessment of soil C. Soil C was highly heterogeneous under the plantings and the adjacent pastures, with up to eight cores required to sample adequately a plot of 400 m2. Vegetation surrogates had limited success in predicting soil C after afforestation, with the only strong predictors being tree density and planting age. Three decades of afforestation with mixed species had not led to substantial changes in C concentration or content of the soil. The C:N ratio of soils increased with planting age suggesting that the C becomes more resistant to decomposition after afforestation. Over longer time scales, tree plantings are likely to have larger impacts on the amount and forms of soil C.",
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author = "Shaun Cunningham and K.J. Metzeling and {MAC NALLY}, Ralph and Jim THOMSON and Cavagnaro Cavagnaro",
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Changes in soil carbon of pastures after afforestation with mixed species: Sampling, heterogeneity and surrogates. / Cunningham, Shaun; Metzeling, K.J.; MAC NALLY, Ralph; THOMSON, Jim; Cavagnaro, Cavagnaro.

In: Agriculture, Ecosystems and Environment, Vol. 158, 2012, p. 58-65.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Changes in soil carbon of pastures after afforestation with mixed species: Sampling, heterogeneity and surrogates

AU - Cunningham, Shaun

AU - Metzeling, K.J.

AU - MAC NALLY, Ralph

AU - THOMSON, Jim

AU - Cavagnaro, Cavagnaro

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KW - Afforestation

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