The Characteristic of Soil Carbon Storage of Four Typical Plantations in Huatan National Forestry Farm in Yangjiang City, Guangdong Province, China

Plantation plays a great role and potential in forest carbon (C) sink. In order to compare and evaluate the effects of different tree species on soil C storage and its stability, this paper took four typical plantations in the Huatan National Forestry Farm in Yangjiang City, Guangdong Province as research objects, and collected soil at a depth of 1 m to determine the total organic C (TOC) and easily oxidized organic C (ROC) contents and storage, to evaluate the soil C stability of the four stands by the ratios of ROC to TOC. The results showed that the TOC storage of the four stands were Pinus caribaea > Acacia mangium > Eucalyptus urophylla > Magnolia sumatrana , the soil ROC storage were Magnolia sumatrana > Pinus caribaea > Acacia mangium > Eucalyptus urophylla , and the ROC/TOC ratios were Magnolia sumatrana > Pinus caribaea > Acacia mangium > Eucalyptus urophylla . This indicated that the soil C stability of the four stands was the highest in Eucalyptus urophylla plantation and the lowest in Magnolia sumatrana plantation. The results of this study can provide scientific data reference for evaluating soil C sequestration and its stability in different plantations in western Guangdong.