No temperature acclimation of soil extracellular enzymes to experimental warming in an alpine grassland ecosystem on the Tibetan Plateau

NWIPB OpenIR

	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
	2014
发表期刊	BIOGEOCHEMISTRY ; Jing, X; Wang, YH; Chung, HG; Mi, ZR; Wang, SP; Zeng, H; He, JS.No temperature acclimation of soil extracellular enzymes to experimental warming in an alpine grassland ecosystem on the Tibetan Plateau,BIOGEOCHEMISTRY,2014,117(1):39
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.; 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.
文献类型	期刊论文
条目标识符	http://210.75.249.4/handle/363003/32345
专题	中国科学院西北高原生物研究所
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]. BIOGEOCHEMISTRY, Jing, X; Wang, YH; Chung, HG; Mi, ZR; Wang, SP; Zeng, H; He, JS.No temperature acclimation of soil extracellular enzymes to experimental warming in an alpine grassland ecosystem on the Tibetan Plateau,BIOGEOCHEMISTRY,2014,117(1):39,2014.
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.
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 (2014).