Chinese Journal of Applied Ecology
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GAO Fei, LIN Wei, CUI Xiao-yang*
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Abstract: To investigate the seasonal dynamics of soil organic carbon (SOC) mineralization in Xiaoxing’an Mountain, we incubated soil samples collected from virgin Korean pine forest and broadleaved secondary forest in different seasons in the laboratory and measured the SOC mineralization rate and cumulative SOC mineralization (Cm). We employed simultaneous reaction model to describe C mineralization kinetics and estimated SOC mineralization parameters including soil easily mineralizable C (C1), potentially mineralizable C (C0). We also analyzed the relations between Cm, C1 and their influencing factors. Results showed that the incubated SOC mineralization rate and Cm for 0-5 cm soil layer decreased from early spring to late autumn, while for 5-10 cm soil layer the seasonal variation was not statistically significant for both forest types. The C1 in 0-5 and 5-10 cm soil layers varied from 42.92-92.18 and 19.23-32.95 mg·kg-1, respectively, while the C0 in 0-5 and 5-10 cm soil layers varied from 863.92-3957.15 and 434.15-865.79 mg·kg-1, respectively. Both C1 and C0 decreased from early spring to late autumn. The proportions of C0 in SOC for two forest types were 0.74%-2.78% and 1.11%-1.84% in 0-5 and 5-10 cm soil layers, respectively, and decreased from early spring to late autumn, indicating that SOC tended to become more stable as a whole from spring to autumn. The Cm and C0 were significantly positively correlated to in situ soil water content and hot waterextractable carbohydrate content, but were not correlated to in situ soil temperature and cool waterextractable carbohydrate content. We concluded that soil labile organic carbon, soil physical and chemical properties contributed to the seasonal dynamics of SOC mineralization in the forests.
GAO Fei, LIN Wei, CUI Xiao-yang*. Seasonal dynamics of soil organic carbon mineralization for two forest types in Xiaoxing’an Mountains, China.[J]. Chinese Journal of Applied Ecology.
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URL: https://www.cjae.net/EN/abstract/abstract12161.shtml
https://www.cjae.net/EN/Y2016/V27/I1/9