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Seasonal dynamics of soil CO2 effluxes with responses to environmental factors in lower subtropical forests of China

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Abstract

Seasonal metrics and environmental responses to forestry soil surface CO2 emission effluxes among three types of lower subtropical forests were consistently monitored over two years with static chamber-gas chromatograph techniques among three types of lower subtropical forests. Results showed that annual CO2 effluxes (S+L) reached 3942.20, 3422.36 and 2163.02 CO2 g·m−2·a−1, respectively in the monsoon evergreen broadleaf forest, mixed broadleaf-coniferous forest and coniferous forest. All the three types of forests revealed the same characteristics of seasonal changes with the CO2 effluxes peaking throughout June to August. During this peaking period, the effluxes were 35.9%, 38.1% and 40.2% of the total annual effluxes, respectively. The CO2 emission process responding to the environmental factors displayed significantly different patterns in forestry soils of the three types of forests. The coniferous forest (CF) was more sensitive to temperature than the other two types. The Q 10 values were higher, along with greater seasonal variations of the CO2 efflux, indicating that the structurally unique forestry ecosystem has disadvantage against interferences. All the three types of forestry CO2 effluxes showed significant correlation with the soil temperature (T s), soil water content (M s) and air pressure (P a). However, stepwise regression analysis indicated no significant correlation between air pressure and the soil CO2 efflux. With an empirical model to measure soil temperature and water content in 5 cm beneath the soil surface, the CO2 effluxes accounting for 75.7%, 77.8% and 86.5% of the efflux variability respectively in soils of BF, MF and PF were calculated. This model can be better used to evaluate the CO2 emission of soils under water stress and arid or semi-arid conditions.

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Authors and Affiliations

  1. South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, 510650, China

    Zhang Deqiang, Zhou Guoyi, Yan Junhua, Liu Shizhong, Zhou Cunyu, Liu Juxiu, Tang Xuli, Li Jiong & Zhang Qianmei

  2. Institute of Geographical Sciences and Natural Resoureces, Chinese Academy of Sciences, Beijing, 100101, China

    Sun Xiaomin

  3. Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100083, China

    Wang Yuesi

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  1. Zhang Deqiang
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  2. Sun Xiaomin
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Zhang, D., Sun, X., Zhou, G. et al. Seasonal dynamics of soil CO2 effluxes with responses to environmental factors in lower subtropical forests of China. SCI CHINA SER D 49 (Suppl 2), 139–149 (2006). https://doi.org/10.1007/s11430-006-8139-z

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  • DOI: https://doi.org/10.1007/s11430-006-8139-z

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