Open AccessSoil organic carbon accumulation during post-agricultural succession in a karst area, southwest China
Author(s) -
Liandong Yang,
Pan Luo,
Lijuan Wen,
Dejun Li
Publication year - 2016
Publication title -
scientific reports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.24
H-Index - 213
ISSN - 2045-2322
DOI - 10.1038/srep37118
Subject(s) - shrubland , soil carbon , karst , ecological succession , environmental science , grassland , subtropics , total organic carbon , soil water , agronomy , soil science , ecology , ecosystem , geography , biology , archaeology
This study was aimed to investigate the direction and magnitude of soil organic carbon (SOC) dynamics and the underlying mechanisms following agricultural abandonment in a subtropical karst area, southwest China. Two post-agriculture succession sequences including grassland (~10 years), shrubland (~29 years), secondary forest (~59 years) and primary forest with cropland as reference were selected. SOC and other soil physicochemical variables in the soil depth of 0–15 cm (representing the average soil depth of the slope in the studied area) were measured. SOC content in the grassland was not significantly elevated relative to the cropland (42.0 ± 7.3 Mg C ha −1 ). SOC content in the shrubland reached the level of the primary forest. On average, SOC content for the forest was 92.6 ± 4.2 Mg C ha −1 , representing an increase of 120.4 ± 10.0% or 50.6 ± 4.2 Mg ha −1 relative to the cropland. Following agricultural abandonment, SOC recovered to the primary forest level in about 40 years with a rate of 1.38 Mg C ha −1 yr −1 . Exchangeable Ca and Mg were found to be the strongest predictors of SOC dynamics. Our results suggest that SOC content may recover rapidly following agricultural abandonment in the karst region of southwest China.