Soil organic carbon storage varies with stand ages and soil depths following afforestation

Authors

  • Guolong Hou Hong Kong Baptist University
  • Claudio O. Delang Hong Kong Baptist University
  • Xixi Lu National University of Singapore
  • Lei Gao Inner Mongolia University

DOI:

https://doi.org/10.15287/afr.2018.1294

Keywords:

carbon sequestration, afforestation, stand age, soil depth

Abstract

Soil organic carbon (SOC) is the largest component of the terrestrial biosphere carbon pool. Afforestation is an effective solution to mitigate Carbon (C) emission and sequester C into soils. However, how and to which extent afforestation influences SOC stock changes are not well understood. This study conducts a quantitative review that synthesizes 544 data points from 261 sites from 90 papers, to examine the impact of afforestation on SOC changes in three soil layers (0-20 cm, 20-40 cm and 40-60 cm). 212 data points are obtained by standardization and/or extrapolationwith high reliability. The results indicate that stand age has significant effects on the SOC stock dynamics under different conditions of previous land use types, plant functional types, temperature or precipitation. The effect is greatest at the topsoil layer of 0-20 cm. Previous land use types significantly influence SOC accumulations, but these effects are not significant in the first 10 years or after 30 years of afforestation. Besides, afforestation on grassland seems to sequester more SOC than that of cropland in the long term. Plant functional types also significantly affect SOC dynamics, with deciduous hardwood reporting a continuous increase of SOC contents at soil depth of 0-60 cm during the whole afforestation period. On the other hand, the accumulation of SOC in evergreen hardwood and evergreen softwood start from the third decades. Higher SOC accumulation rates are observed under evergreen hardwood but no significant differences were found between deciduous hardwood and evergreen softwood for the longer period after afforestation (>20 years). Mean annual temperature and precipitation negatively affect SOC accumulation in the first two decades of afforestation, however, the effects become positive in the later years.We also found that initial SOC stocks did not play a major role in SOC sequestration. In other words, lower SOC soils could also sequestrate a significant amount of SOC after reforestation.

Author Biographies

Guolong Hou, Hong Kong Baptist University

ProfessorDepartment of Geography

Claudio O. Delang, Hong Kong Baptist University

Department of GeographyProfessor 

Xixi Lu, National University of Singapore

ProfessorDepartment of Geography

Lei Gao, Inner Mongolia University

Professor

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Published

2019-07-30

Issue

Section

Research article