Organic carbon mineralization in soils of a natural forest and a forest plantation of southeastern China

Jinxue Huang, Teng Chiu Lin, Decheng Xiong, Zhijie Yang, Xiaofei Liu, Guangshui Chen, Jinsheng Xie, Yiqing Li, Yusheng Yang

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Understanding soil organic carbon (SOC) mineralization under different temperature regimes is critical for predicting SOC responses to climate change. Yet, the effects of altering temperature regimes on SOC mineralization remain poorly understood in forest plantations converted from natural forests. Forest conversion is extensive and could have major impact on SOC dynamics, so that this knowledge limits our ability of predicting the consequences of such land use change on carbon cycling. To fill this knowledge gap, we conducted a 360-day incubation experiment under constant and varying temperature regimes for soils of a natural forest and a Chinese fir (Cunninghamia lanceolata) plantation. Results showed that SOC mineralization was greater in the forest plantation soil than in the natural forest soil in both temperature treatments, possibly due to greater labile SOC in the forest plantation soil by 27–28%. The results suggested that replacing natural forests with forest plantations may increase CO 2 emission via the mineralization of SOC. In the natural forest soil, SOC mineralization was greater in the varying temperature treatment relative to the constant temperature treatment but no difference was found in the forest plantation soil. Moreover, temperature sensitivity (Q 10 ) of SOC mineralization was greater in the natural forest soil than the Chinese fir soil for the 0–180 day of the incubation. The difference in the response to the two temperature treatments between the two forest soils which was accompanied by difference in soil microbial communities. It was likely that soil microbes of the closed-canopy natural forest were less adapted to temperature fluctuations than soil microbes of the forest plantation soil as the canopy was rarely closed. Our results highlight that soil incubation experiments need to take temperature fluctuations into consideration to more accurately reflect SOC dynamics in the field, especially when evaluating the impacts of replacing natural forests with forest plantations on soil carbon dynamics.

Original languageEnglish
Pages (from-to)119-126
Number of pages8
JournalGeoderma
Volume344
DOIs
Publication statusPublished - 2019 Jun 15

Fingerprint

forest plantations
soil organic carbon
mineralization
plantation
organic carbon
China
carbon
soil
Cunninghamia lanceolata
forest soils
temperature
soil microorganisms
forest soil
natural forest
canopy
soil temperature regimes
incubation
land use change
soil temperature
microbial communities

Keywords

  • Incubation
  • Microbial biomass carbon (MBC)
  • PLFAs
  • Soil organic carbon
  • Subtropical forest
  • Temperature fluctuation

ASJC Scopus subject areas

  • Soil Science

Cite this

Organic carbon mineralization in soils of a natural forest and a forest plantation of southeastern China. / Huang, Jinxue; Lin, Teng Chiu; Xiong, Decheng; Yang, Zhijie; Liu, Xiaofei; Chen, Guangshui; Xie, Jinsheng; Li, Yiqing; Yang, Yusheng.

In: Geoderma, Vol. 344, 15.06.2019, p. 119-126.

Research output: Contribution to journalArticle

Huang, Jinxue ; Lin, Teng Chiu ; Xiong, Decheng ; Yang, Zhijie ; Liu, Xiaofei ; Chen, Guangshui ; Xie, Jinsheng ; Li, Yiqing ; Yang, Yusheng. / Organic carbon mineralization in soils of a natural forest and a forest plantation of southeastern China. In: Geoderma. 2019 ; Vol. 344. pp. 119-126.
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AB - Understanding soil organic carbon (SOC) mineralization under different temperature regimes is critical for predicting SOC responses to climate change. Yet, the effects of altering temperature regimes on SOC mineralization remain poorly understood in forest plantations converted from natural forests. Forest conversion is extensive and could have major impact on SOC dynamics, so that this knowledge limits our ability of predicting the consequences of such land use change on carbon cycling. To fill this knowledge gap, we conducted a 360-day incubation experiment under constant and varying temperature regimes for soils of a natural forest and a Chinese fir (Cunninghamia lanceolata) plantation. Results showed that SOC mineralization was greater in the forest plantation soil than in the natural forest soil in both temperature treatments, possibly due to greater labile SOC in the forest plantation soil by 27–28%. The results suggested that replacing natural forests with forest plantations may increase CO 2 emission via the mineralization of SOC. In the natural forest soil, SOC mineralization was greater in the varying temperature treatment relative to the constant temperature treatment but no difference was found in the forest plantation soil. Moreover, temperature sensitivity (Q 10 ) of SOC mineralization was greater in the natural forest soil than the Chinese fir soil for the 0–180 day of the incubation. The difference in the response to the two temperature treatments between the two forest soils which was accompanied by difference in soil microbial communities. It was likely that soil microbes of the closed-canopy natural forest were less adapted to temperature fluctuations than soil microbes of the forest plantation soil as the canopy was rarely closed. Our results highlight that soil incubation experiments need to take temperature fluctuations into consideration to more accurately reflect SOC dynamics in the field, especially when evaluating the impacts of replacing natural forests with forest plantations on soil carbon dynamics.

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