Drivers of difference in CO2 and CH4 emissions between rubber plantation and tropical rainforest soils
2021
Zhou, Wenjun | Zhu, Jing | Ji, Hongli | Grace, John | Sha, Liqing | Song, Qinghai | Liu, Yuntong | Bai, Xiaolong | Lin, Youxing | Gao, Jinbo | Fei, Xuehai | Zhou, Ruiwu | Tang, Jianwei | Deng, Xiaobao | Yu, Guirui | Zhang, Junhui | Zheng, Xunhua | Zhao, Junbin | Zhang, Yiping
With large area of primary tropical rainforest converted into rubber (Hevea brasiliensis) plantation in Southeast Asia, it is necessary to examine the change in soil CO₂ and CH₄ emissions, and their underlying drivers in tropical rainforest (TRF) and rubber plantation. In TRF and RP in Xishuangbanna Southwest China, we measured the soil CO₂ , CH₄ , temperature, and water content once each week from 2003 to 2008, and twice weeks in 2013 and 2014. Additionally, the concentrations of soil carbon (C) and nitrogen (N) fractions from 2013 to 2014 were observed. Inputs of litter and live, dead, decomposed fine roots dynamics were also included. TRF transplanted to RP did not change significantly the annual soil CO₂ emissions (TRF, 359 ± 91 and RP 352 ± 41 mg CO₂ m⁻² h⁻¹) but decreased soil CH₄ uptake significantly (TRF, −0.11 ± 0.18 mg CH₄ m⁻² h⁻¹) RP, −0.020 ± 0.087 mg CH₄ m⁻² h⁻¹). The most important influence on soil CO₂ and CH₄ emissions in the RP was the leaf area index and soil water content, respectively, whereas the soil water content, soil temperature, and dead fine roots were the most important factors in the TRF. Variations in the soil CO₂ and CH₄ caused by land-use transition were individually explained by soil temperature and fine root growth and decomposition, respectively. The results show that land-use change varied the soil CH₄ and CO₂ emission dynamics and drivers by the variation of soil environmental and plant's factors.
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