气候变化领域集成服务门户(CCPortal): Environmental controls on soil respiration in alpine meadow along a large altitudinal gradient on the central Tibetan Plateau

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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, Jingxue; Li, Ruicheng; Li, Xiang; Tian, Lihua
通讯作者	Zhao, JX (通讯作者)
发表日期	2017
ISSN	0341-8162
EISSN	1872-6887
起始页码	84
结束页码	92
卷号	159
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.
关键词	CARBON-DIOXIDE EXCHANGE ECOSYSTEM CO2 EXCHANGE TEMPERATURE SENSITIVITY TERRESTRIAL ECOSYSTEMS MICROBIAL RESPIRATION SEMIARID GRASSLANDS TALLGRASS PRAIRIE GROWING-SEASON CLIMATE-CHANGE RESPONSES
英文关键词	Alpine meadow; Soil respiration; Temperature sensitivity; Tibetan Plateau; Environmental controls
语种	英语
WOS研究方向	Geology ; Agriculture ; Water Resources
WOS类目	Geosciences, Multidisciplinary ; Soil Science ; Water Resources
WOS记录号	WOS:000412254700008
来源期刊	CATENA
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/258961
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]. 中国科学院青藏高原研究所,2017,159.
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,159.
MLA	Zhao, Jingxue,et al."Environmental controls on soil respiration in alpine meadow along a large altitudinal gradient on the central Tibetan Plateau".CATENA 159(2017).