Environmental controls on soil respiration in alpine meadow along a   large altitudinal gradient on the central Tibetan Plateau

doi:10.1016/j.catena.2017.08.007

CORC > 北京大学 > 城市与环境学院

	Environmental controls on soil respiration in alpine meadow along a large altitudinal gradient on the central Tibetan Plateau
	Zhao, Jingxue ; Li, Ruicheng ; Li, Xiang ; Tian, Lihua
刊名	CATENA
	2017
关键词	Alpine meadow Soil respiration Temperature sensitivity Tibetan Plateau Environmental controls CARBON-DIOXIDE EXCHANGE ECOSYSTEM CO2 EXCHANGE TEMPERATURE SENSITIVITY CLIMATE-CHANGE TERRESTRIAL ECOSYSTEMS MICROBIAL RESPIRATION SEMIARID GRASSLANDS TALLGRASS PRAIRIE GROWING-SEASON CHINA
DOI	10.1016/j.catena.2017.08.007
英文摘要	Little is known about how environmental factors modify spatiotemporal variations of soil respiration (Rs) and its temperature sensitivity (Q(10)) in alpine grasslands on the Tibetan Plateau (TP). We conducted an altitudinal experiment across lower and upper limits of alpine meadows on the central TP. Soil respiration and related environmental factors were observed at each of 7 altitudes (from 4400 m to 5200 m) during the growing seasons of 2012 and 2013. Soil temperature (ST) rather than soil moisture (SM) was the major abiotic factor controlling seasonal variation of Rs in alpine grasslands across the seven altitudes. In addition to ST and SM, plant biomass is also an important factor controlling seasonal trends of Rs. The seasonal mean Rs increased with increasing altitude up to 4950 m, and then decreased above 4950 m. Below-ground biomass (BGB), ST and SM have direct effects on Rs, and the altitudinal trends of Rs can be well-predicated from these three variables (R-2 - 0.65). The Q(10) values of seasonal Rs generally increased with increasing altitude. Alpine meadows generally have higher Q(10) values comparing with steppe meadows. Along the altitude gradient, Q(10) was negatively correlated with ST, but positively correlated with SM, AGB, BGB and SOC. The results suggested that future climate warming would enhance Rs rates more dramatically in high-altitudes grasslands, and changes in vegetation structure under climate change might have a large impact on Rs in these alpine grasslands.; Strategic Priority Research Program (B) of the Chinese Academy of Sciences [XDB03030402]; National Key Projects for Basic Research of China [2010CB951301]; China Postdoctoral Science Foundation [2017M610698]; SCI(E); ARTICLE; 84-92; 159
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/470359]
专题	城市与环境学院
推荐引用方式 GB/T 7714	Zhao, Jingxue,Li, Ruicheng,Li, Xiang,et al. Environmental controls on soil respiration in alpine meadow along a large altitudinal gradient on the central Tibetan Plateau[J]. CATENA,2017.
APA	Zhao, Jingxue,Li, Ruicheng,Li, Xiang,&Tian, Lihua.(2017).Environmental controls on soil respiration in alpine meadow along a large altitudinal gradient on the central Tibetan Plateau.CATENA.
MLA	Zhao, Jingxue,et al."Environmental controls on soil respiration in alpine meadow along a large altitudinal gradient on the central Tibetan Plateau".CATENA (2017).