期刊
APPLIED SOIL ECOLOGY
卷 87, 期 -, 页码 32-38出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsoil.2014.11.012
关键词
Global warming; Increased temperature; Microbial biomass; Response ratio
类别
资金
- National Natural Science Foundation of China [41171084]
- Chinese Academy of Science Western Light Talents Program (Response of livestock carrying capability to climatic change and grazing in the alpine meadow of Northern Tibetan Plateau)
- Natural Science Foundation of Tibet Autonomous Region (Response of species richness and above-ground biomass to warming in the alpine meadow of Tibet)
Alpine ecosystems at high altitudes and latitudes are notably sensitive to climatic warming and the Tibetan Plateau is a widely distributed alpine ecosystem. The magnitude of climatic warming on the Tibetan Plateau is expected to be considerably greater than the global average. However, a synthesis of the experimental warming soil carbon and nitrogen data is still lacking and whether forest soils are more sensitive to warming than grassland soils remains unclear. In this study, we used a meta-analysis approach to synthesise 196 observations from 25 published studies on the Tibetan Plateau. Warming significantly increased microbial biomass carbon (MBC) by 14.3% (95% CI: 2.9-24.6%), microbial biomass nitrogen (MBN) by 20.1% (95% CI: 2.0-45.1%), net nitrogen mineralization by 49.2% (95% CI: 38.1-62.3%) and net nitrification by 56.0% (95% CI: 51.4-66.1%), but did not significantly affect soil carbon (95% CI: -13.9 to 2.7%) or nitrogen (95% CI: -12.4 to 2.6%). The mean annual air temperature was negatively correlated with the warming effects on MBC and MBN. Grasslands exhibited significant MBC and MBN responses to warming. Specifically, soil microbial biomass was more responsive to warming in colder environments. Moreover, forest soils are not always more sensitive to warming than grassland soils as previous studies have suggested. These findings indicate that clarifying the effect of warming on alpine soils need consider ecosystem types and their local climate. (C) 2014 Elsevier B.V. All rights reserved.
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