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Citation:

Analysis of CO2 Efflux in Soil Profiles after Clear-cutting and Prescribed Burning of Natural Regenerated Castanopsis carlesis Secondary Forest in Subtropical China

  • Received Date: 2015-06-15
  • Clear-cutting & prescribed burning is one of the most common management measures in the economic development of Chinese forestry, which not only has a strong interference in woodland, but also leads to the changes in soil physical and chemical properties. In order to evaluate the importance of clear-cutting and prescribed burning on the soil organic carbon uptake and storage of different depths in mid-subtropical evergreen broad-leaved forest, taking 36-year-old natural regenerated Castanopsis carlesis secondary stand in Fujian Province as the object, the Fick's diffusion method were used to calculate the daily dynamic changes of soil CO2 flux from 0 to 80 cm depth of soil. And the relationship between the CO2 flux and soil temperature, moisture in soil profiles was also analyzed by using regression models. The results are as follows: (1) The CO2 concentration in different soil layers decreased significantly after clear-cutting and prescribed burning, and the closer to the surface, the larger the decline. From 0 to 80 cm soil depth, the mean daily CO2 concentration in the controlled (CK) plot was 1.9 times in residue burnt (RB) plot and 1.3 times in residue retention (RR) plot. And both in RB and RR plot, different depth of soil CO2 concentration decreased obviously. (2) The daily dynamic changes of CO2 flux in soil profile showed a mono-peak trend, with its maximum value mainly from 12:30 am to 15:30 pm as well as the minimum from 6:30 pm to 9:30 pm, the mean daily soil respiration in RB plot (1.99 μmol·m2·s-1) was significantly higher than that in RR plot (0.99 μmol·m2·s-1) and CK plot (0.96 μmol·m2·s-1), the whole soil CO2 flux in all the test plots decreased with the increasing of soil depth. The daily average CO2 flux in soil profile of RB plot was significantly higher than the others, except for the soil depth from 20 to 40 cm. And there was no significant difference on daily CO2 flux in soil profiles of RR and CK plot. (3) In addition, the diurnal range of soil CO2 flux in RB plot (147%) was higher than that in the RR (99%) and the CK plot (66%), and there are some significant differences of RB vs. RR and CK (PP2 flux vs. soil temperature, it was found that the CO2 efflux of different depth soil correlated exponentially with soil temperature in all plots, and the Q10 value showed that the sensitivity of soil temperature increased significantly after clear-cutting and prescribed burning. But the soil moisture was not significant correlated with CO2 efflux. And the hybrid model of temperature and soil moisture was proved to be a more appropriate predictor of CO2 dynamic state in all testing plots. Consequently, clear-cutting & prescribed burning could definitely affect CO2 flux in deep soil as well as its daily dynamic, and would also change the soil CO2 flux of soil temperature and moisture content of different soil layer response mechanism.
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Analysis of CO2 Efflux in Soil Profiles after Clear-cutting and Prescribed Burning of Natural Regenerated Castanopsis carlesis Secondary Forest in Subtropical China

  • 1. College of Geographical Sciences, State Key Laboratory Breeding Base of Humid Subtropical Mountain Ecology, Fujian Normal University, Fuzhou 350007, Fujian, China

Abstract: Clear-cutting & prescribed burning is one of the most common management measures in the economic development of Chinese forestry, which not only has a strong interference in woodland, but also leads to the changes in soil physical and chemical properties. In order to evaluate the importance of clear-cutting and prescribed burning on the soil organic carbon uptake and storage of different depths in mid-subtropical evergreen broad-leaved forest, taking 36-year-old natural regenerated Castanopsis carlesis secondary stand in Fujian Province as the object, the Fick's diffusion method were used to calculate the daily dynamic changes of soil CO2 flux from 0 to 80 cm depth of soil. And the relationship between the CO2 flux and soil temperature, moisture in soil profiles was also analyzed by using regression models. The results are as follows: (1) The CO2 concentration in different soil layers decreased significantly after clear-cutting and prescribed burning, and the closer to the surface, the larger the decline. From 0 to 80 cm soil depth, the mean daily CO2 concentration in the controlled (CK) plot was 1.9 times in residue burnt (RB) plot and 1.3 times in residue retention (RR) plot. And both in RB and RR plot, different depth of soil CO2 concentration decreased obviously. (2) The daily dynamic changes of CO2 flux in soil profile showed a mono-peak trend, with its maximum value mainly from 12:30 am to 15:30 pm as well as the minimum from 6:30 pm to 9:30 pm, the mean daily soil respiration in RB plot (1.99 μmol·m2·s-1) was significantly higher than that in RR plot (0.99 μmol·m2·s-1) and CK plot (0.96 μmol·m2·s-1), the whole soil CO2 flux in all the test plots decreased with the increasing of soil depth. The daily average CO2 flux in soil profile of RB plot was significantly higher than the others, except for the soil depth from 20 to 40 cm. And there was no significant difference on daily CO2 flux in soil profiles of RR and CK plot. (3) In addition, the diurnal range of soil CO2 flux in RB plot (147%) was higher than that in the RR (99%) and the CK plot (66%), and there are some significant differences of RB vs. RR and CK (PP2 flux vs. soil temperature, it was found that the CO2 efflux of different depth soil correlated exponentially with soil temperature in all plots, and the Q10 value showed that the sensitivity of soil temperature increased significantly after clear-cutting and prescribed burning. But the soil moisture was not significant correlated with CO2 efflux. And the hybrid model of temperature and soil moisture was proved to be a more appropriate predictor of CO2 dynamic state in all testing plots. Consequently, clear-cutting & prescribed burning could definitely affect CO2 flux in deep soil as well as its daily dynamic, and would also change the soil CO2 flux of soil temperature and moisture content of different soil layer response mechanism.

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