Objective The distribution characteristics and influencing factors of soil readily oxidized organic carbon (ROC) were investigated in order to provide a scientific basis for improving the"carbon sequestration"capacity of tropical rainforests and alleviating global warming.
Method The soil of the peripheral secondary forests of Jianfengling, Bawangling and Yinggeling in western Hainan Province was used as the research object. Based on the analysis of soil organic carbon (SOC) characteristics, correlation analysis and linear regression analysis were used to explore the corelation between the distribution laws of soil ROC and the environmental factors in the study regions.
Result ROC content in soil of secondary forests ranked as: Jianfengling < Bawangling < Yinggeling, which was consistent with the law of the distribution characteristics of the SOC. On the vertical profiles of soil, the ROC content gradually decreased with the increase in soil depths. The ROC content in the 0-10 cm soil layer was significantly different from that in the 10-30 cm and 30-50 cm soil layers. The proportion of ROC in the 0-50 cm profile was showed as: Bawangling > Yinggeling > Jianfengling. There was an extremely significant and negative correlation between ROC with silt and clay soil on Jianfengling and Bawangling, and was an extremely significant and positive correlation between ROC with silt and clay soil on Yinggeling. Both the pH value and ROC content of these three mountains were extremely significantly correlated. The correlation between ROC content and pH value ranked as: Bawangling > Yinggeling > Jianfengling.
Conclusion The ROC content of secondary forests is not only affected by the soil organic carbon content, but also by a number of environmental factors such as soil physiochemical properties (pH, soil texture distribution), soil total organic carbon and other environmental factors, which also play a certain role in determining the distribution of ROC in soil of secondary forests.
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