| Title | Elevated CO(2)decreases soil carbon stability in Tibetan Plateau |
| Authors | Zhao, Guang Liang, Chao Feng, Xiaojuan Liu, Lingli Zhu, Juntao Chen, Ning Chen, Yao Wang, Li Zhang, Yangjian |
| Affiliation | Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, 11 Datun Rd, Beijing 100101, Peoples R China Chinese Acad Sci, Inst Appl Ecol, Shenyang 110016, Peoples R China Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100101, Peoples R China Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100101, Peoples R China Univ Chinese Acad Sci, Beijing 100101, Peoples R China Peking Univ, Shenzhen Grad Sch, Shenzhen 518055, Peoples R China CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China |
| Keywords | PROGRESSIVE NITROGEN LIMITATION ATMOSPHERIC CO2 ECOSYSTEM RESPONSES PINE FOREST DIOXIDE PLANTS POOLS FACE TURNOVER GROWTH |
| Issue Date | Nov-2020 |
| Publisher | ENVIRONMENTAL RESEARCH LETTERS |
| Abstract | 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 CO2. |
| URI | http://hdl.handle.net/20.500.11897/592836 |
| ISSN | 1748-9326 |
| DOI | 10.1088/1748-9326/abbb50 |
| Indexed | SCI(E) |
| Appears in Collections: | 深圳研究生院待认领 |
