globalchange  > 气候减缓与适应
DOI: 10.1007/s10533-013-9844-2
Scopus记录号: 2-s2.0-84891902025
论文题名:
No temperature acclimation of soil extracellular enzymes to experimental warming in an alpine grassland ecosystem on the Tibetan Plateau
作者: Jing X.; Wang Y.; Chung H.; Mi Z.; Wang S.; Zeng H.; He J.-S.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 117, 期:1
起始页码: 39
结束页码: 54
语种: 英语
英文关键词: Alpine grassland ; Global warming ; Q10 ; Soil extracellular enzyme activity ; Temperature acclimation ; Tibetan plateau
Scopus关键词: acclimation ; adaptation ; alpine environment ; biogeochemistry ; biomass ; carbon sequestration ; enzyme activity ; global warming ; grassland ; grassland soil ; organic carbon ; seasonal variation ; China ; Qinghai-Xizang Plateau
英文摘要: Alpine grassland soils store large amounts of soil organic carbon (SOC) and are susceptible to rising air temperature. Soil extracellular enzymes catalyze the rate-limiting step in SOC decomposition and their catalysis, production and degradation rates are regulated by temperature. Therefore, the responses of these enzymes to warming could have a profound impact on carbon cycling in the alpine grassland ecosystems. This study was conducted to measure the responses of soil extracellular enzyme activity and temperature sensitivity (Q10) to experimental warming in samples from an alpine grassland ecosystem on the Tibetan Plateau. A free air-temperature enhancement system was set up in May 2006. We measured soil microbial biomass, nutrient availability and the activity of five extracellular enzymes in 2009 and 2010. The Q10 of each enzyme was calculated using a simple first-order exponential equation. We found that warming had no significant effects on soil microbial biomass C, the labile C or N content, or nutrient availability. Significant differences in the activity of most extracellular enzymes among sampling dates were found, with typically higher enzyme activity during the warm period of the year. The effects of warming on the activity of the five extracellular enzymes at 20 °C were not significant. Enzyme activity in vitro strongly increased with temperature up to 27 °C or over 30 °C (optimum temperature; Topt). Seasonal variations in the Q10 were found, but the effects of warming on Q10 were not significant. We conclude that soil extracellular enzymes adapted to seasonal temperature variations, but did not acclimate to the field experimental warming. © 2013 Springer Science+Business Media Dordrecht.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83603
Appears in Collections:气候减缓与适应
气候变化事实与影响

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作者单位: Department of Ecology, College of Urban and Environmental Sciences, Key Laboratory for Earth Surface Processes of the Ministry of Education, Peking University, 5 Yiheyuan Rd, Beijing, 100871, China; Key Laboratory of Adaptation and Evolution of Plateau Biota, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, 23 Xinning Rd, Xining, 810008, China; Department of Environmental Engineering, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul, 143-701, South Korea; Laboratory of Alpine Ecology and Biodiversity, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, 100085, China; Key Laboratory for Urban Habitat Environmental Science and Technology, Peking University Shenzhen Graduate School, Peking University, Shenzhen, 518055, China

Recommended Citation:
Jing X.,Wang Y.,Chung H.,et al. No temperature acclimation of soil extracellular enzymes to experimental warming in an alpine grassland ecosystem on the Tibetan Plateau[J]. Biogeochemistry,2014-01-01,117(1)
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