气候变化领域集成服务门户(CCPortal): No temperature acclimation of soil extracellular enzymes to experimental warming in an alpine grassland ecosystem on the Tibetan Plateau

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DOI	10.1007/s10533-013-9844-2
	No temperature acclimation of soil extracellular enzymes to experimental warming in an alpine grassland ecosystem on the Tibetan Plateau
	Jing, Xin; Wang, Yonghui; Chung, Haegeun; Mi, Zhaorong; Wang, Shiping; Zeng, Hui; He, Jin-Sheng
通讯作者	He, JS (通讯作者)
发表日期	2014
ISSN	0168-2563
EISSN	1573-515X
起始页码	39
结束页码	54
卷号	117 期号:1
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 (Q(10)) 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 Q(10) 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 A degrees C were not significant. Enzyme activity in vitro strongly increased with temperature up to 27 A degrees C or over 30 A degrees C (optimum temperature; T-opt). Seasonal variations in the Q(10) were found, but the effects of warming on Q(10) were not significant. We conclude that soil extracellular enzymes adapted to seasonal temperature variations, but did not acclimate to the field experimental warming.
关键词	CARBON-CYCLE FEEDBACKS MICROBIAL BIOMASS ORGANIC-CARBON CLIMATE-CHANGE BOREAL FOREST NITROGEN DEPOSITION THERMAL ADAPTATION SEASONAL PATTERNS EXTRACTION METHOD CO2 FLUX
英文关键词	Global warming; Temperature acclimation; Soil extracellular enzyme activity; Q(10); Alpine grassland; Tibetan plateau
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Geology
WOS类目	Environmental Sciences ; Geosciences, Multidisciplinary
WOS记录号	WOS:000329606200004
来源期刊	BIOGEOCHEMISTRY
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258346
推荐引用方式 GB/T 7714	Jing, Xin,Wang, Yonghui,Chung, Haegeun,et al. No temperature acclimation of soil extracellular enzymes to experimental warming in an alpine grassland ecosystem on the Tibetan Plateau[J]. 中国科学院青藏高原研究所,2014,117(1).
APA	Jing, Xin.,Wang, Yonghui.,Chung, Haegeun.,Mi, Zhaorong.,Wang, Shiping.,...&He, Jin-Sheng.(2014).No temperature acclimation of soil extracellular enzymes to experimental warming in an alpine grassland ecosystem on the Tibetan Plateau.BIOGEOCHEMISTRY,117(1).
MLA	Jing, Xin,et al."No temperature acclimation of soil extracellular enzymes to experimental warming in an alpine grassland ecosystem on the Tibetan Plateau".BIOGEOCHEMISTRY 117.1(2014).