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

	Environmental controls on soil respiration in alpine meadow along a large altitudinal gradient on the central Tibetan Plateau
	Zhao, JX (Zhao, Jingxue)1,2; Li, RC (Li, Ruicheng)2; Li, X (Li, Xiang)1; Tian, LH (Tian, Lihua)3; Zhao, JX
刊名	CATENA
	2017
卷号	159 期号:0 页码:84-92
关键词	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
文献子类	Article
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.
学科主题	普通生物学
WOS研究方向	Geology; Agriculture; Water Resources
语种	英语
WOS记录号	WOS:000412254700008
内容类型	期刊论文
源URL	[http://ir.itpcas.ac.cn/handle/131C11/7931]
专题	青藏高原研究所_图书馆
通讯作者	Zhao, JX
作者单位	1.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Alpine Ecol & Biodivers, Beijing 100101, Peoples R China. 2.Peking Univ, Key Lab Earth Surface Proc, Minist Educ, Coll Urban & Environm Sci,Dept Ecol, Beijing 100871, Peoples R China. 3.Southwest Minzu Univ, Inst Qinghai Tibetan Plateau, Chengdu 610041, Sichuan, Peoples R China.
推荐引用方式 GB/T 7714	Zhao, JX ,Li, RC ,Li, X ,et al. Environmental controls on soil respiration in alpine meadow along a large altitudinal gradient on the central Tibetan Plateau[J]. CATENA,2017,159(0):84-92.
APA	Zhao, JX ,Li, RC ,Li, X ,Tian, LH ,&Zhao, JX.(2017).Environmental controls on soil respiration in alpine meadow along a large altitudinal gradient on the central Tibetan Plateau.CATENA,159(0),84-92.
MLA	Zhao, JX ,et al."Environmental controls on soil respiration in alpine meadow along a large altitudinal gradient on the central Tibetan Plateau".CATENA 159.0(2017):84-92.