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Elevated CO2 decreases soil carbon stability in Tibetan Plateau
The lack of ecosystem-scale CO _2 enrichment experiments in alpine regions considerably restricts our ability to predict the feedback of the global carbon (C) cycle to climate change. Here we investigate soil C response in an experiment with 5-year CO _2 enrichment and nitrogen (N) fertilization in a Tibetan meadow (4585 m above the sea level). We found that despite non-significant increase in bulk soil C pool, elevated CO _2 dramatically altered the allocation of C in different soil fractions and soil mineralization potentials. By changing soil microbial composition and enhancing enzyme activities, elevated CO _2 significantly accelerated soil organic matter (SOM) mineralization rates and stimulated the microbial utilization of ‘old C’ relative to that of ‘new C’. Furthermore, N fertilization under elevated CO _2 altered the decomposition process, increased the fungi to bacteria ratio, and decreased the coarse particulate organic matter pool and enzyme activities, indicating that N fertilization counters the CO _2 fertilization effect. Overall, our findings suggest a growing threat of elevated CO _2 in reducing SOM stability, and highlight the key role of N availability in driving soil C turnover under elevated CO _2 .
Elevated CO2 decreases soil carbon stability in Tibetan Plateau
The lack of ecosystem-scale CO _2 enrichment experiments in alpine regions considerably restricts our ability to predict the feedback of the global carbon (C) cycle to climate change. Here we investigate soil C response in an experiment with 5-year CO _2 enrichment and nitrogen (N) fertilization in a Tibetan meadow (4585 m above the sea level). We found that despite non-significant increase in bulk soil C pool, elevated CO _2 dramatically altered the allocation of C in different soil fractions and soil mineralization potentials. By changing soil microbial composition and enhancing enzyme activities, elevated CO _2 significantly accelerated soil organic matter (SOM) mineralization rates and stimulated the microbial utilization of ‘old C’ relative to that of ‘new C’. Furthermore, N fertilization under elevated CO _2 altered the decomposition process, increased the fungi to bacteria ratio, and decreased the coarse particulate organic matter pool and enzyme activities, indicating that N fertilization counters the CO _2 fertilization effect. Overall, our findings suggest a growing threat of elevated CO _2 in reducing SOM stability, and highlight the key role of N availability in driving soil C turnover under elevated CO _2 .
Elevated CO2 decreases soil carbon stability in Tibetan Plateau
Guang Zhao (author) / Chao Liang (author) / Xiaojuan Feng (author) / Lingli Liu (author) / Juntao Zhu (author) / Ning Chen (author) / Yao Chen (author) / Li Wang (author) / Yangjian Zhang (author)
2020
Article (Journal)
Electronic Resource
Unknown
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