气候变化领域集成服务门户(CCPortal): Carbon pools and fluxes in a Tibetan alpine Kobresia pygmaea pasture partitioned by coupled eddy-covariance measurements and (CO2)-C-13 pulse labeling

CCPortal

DOI	10.1016/j.scitotenv.2014.10.082
	Carbon pools and fluxes in a Tibetan alpine Kobresia pygmaea pasture partitioned by coupled eddy-covariance measurements and (CO2)-C-13 pulse labeling
	Ingrisch, Johannes; Biermann, Tobias; Seeber, Elke; Leipold, Thomas; Li, Maoshan; Ma, Yaoming; Xu, Xingliang; Miehe, Georg; Guggenberger, Georg; Foken, Thomas; Kuzyakov, Yakov
通讯作者	Ingrisch, J (通讯作者)
发表日期	2015
ISSN	0048-9697
EISSN	1879-1026
起始页码	1213
结束页码	1224
卷号	505
英文摘要	The Tibetan highlands host the largest alpine grassland ecosystems worldwide, bearing soils that store substantial stocks of carbon (C) that are very sensitive to land use changes. This study focuses on the cycling of photoassimilated C within a Kobresia pygmaea pasture, the dominating ecosystems on the Tibetan highlands. We investigated short-term effects of grazing cessation and the role of the characteristic Kobresia root turf on C fluxes and belowground C turnover. By combining eddy-covariance measurements with (CO2)-C-13 pulse labeling we applied a powerful new approach to measure absolute fluxes of assimilates within and between various pools of the plant-soil-atmosphere system. The roots and soil each store roughly 50% of the overall C in the system (76 Mg Cha(-1)), with only a minor contribution from shoots, which is also expressed in the root:shoot ratio of 90. During June and July the pasture acted as a weak C sink with a strong uptake of approximately 2 g C m(-2) d(-1) in the first half of July. The root turf was the main compartment for the turnover of photoassimilates, with a subset of highly dynamic roots (mean residence time 20 days), and plays a key role for the C cycling and C storage in this ecosystem. The short-term grazing cessation only affected aboveground biomass but not ecosystem scale C exchange or assimilate allocation into roots and soil. (C) 2014 Elsevier B.V. All rights reserved.
关键词	ECOSYSTEM CO2 EXCHANGE RANGELAND DEGRADATION ASSIMILATED CARBON MEADOW ECOSYSTEM DIOXIDE EXCHANGE SOIL PLATEAU QINGHAI GRASSLAND CHINA
英文关键词	Alpine grassland; Carbon cycle; Land use changes; Grazing; Tibetan-Plateau
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Environmental Sciences
WOS记录号	WOS:000347654900120
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
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/258605
推荐引用方式 GB/T 7714	Ingrisch, Johannes,Biermann, Tobias,Seeber, Elke,et al. Carbon pools and fluxes in a Tibetan alpine Kobresia pygmaea pasture partitioned by coupled eddy-covariance measurements and (CO2)-C-13 pulse labeling[J]. 中国科学院青藏高原研究所,2015,505.
APA	Ingrisch, Johannes.,Biermann, Tobias.,Seeber, Elke.,Leipold, Thomas.,Li, Maoshan.,...&Kuzyakov, Yakov.(2015).Carbon pools and fluxes in a Tibetan alpine Kobresia pygmaea pasture partitioned by coupled eddy-covariance measurements and (CO2)-C-13 pulse labeling.SCIENCE OF THE TOTAL ENVIRONMENT,505.
MLA	Ingrisch, Johannes,et al."Carbon pools and fluxes in a Tibetan alpine Kobresia pygmaea pasture partitioned by coupled eddy-covariance measurements and (CO2)-C-13 pulse labeling".SCIENCE OF THE TOTAL ENVIRONMENT 505(2015).