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	Partitioning pattern of carbon flux in a Kobresia grassland on the Qinghai-Tibetan Plateau revealed by field 13C pulse-labeling
	Wu Y. B. ; Tan H. C. ; Deng Y. C. ; Wu J. ; Xu X. L. ; Wang Y. F. ; Tang Y. H. ; Higashi T. ; Cui X. Y.
	2010
关键词	13C pulse labeling alpine meadow carbon allocation carbon turnover grazing photosynthetically-fixed carbon festuca-pratensis l lolium-perenne upland grassland alpine meadow root exudation soil rhizosphere plants c-14
英文摘要	Characterizing the carbon turnover in terrestrial ecosystems is critical for understanding and predicting carbon dynamics in ecosystems. We used in situ 13C pulse labeling to track photosynthetic carbon fluxes from shoot to roots and to soil in a Kobresia humilis meadow on the Qinghai-Tibet Plateau. We found that about 36.7% of labeled carbon was translocated out from the shoots within the first 24 h after photosynthetic uptake. This is equivalent to 66.1% of total 13C moving out from the shoot during the 32-day chase period, indicating a rapid and large translocation of newly fixed carbon to belowground parts in these alpine plants. 58.7% of the assimilated 13C was transferred belowground. At the end of the chase phase, 30.9% was retained in living roots, 3.4% in dead roots, 17.2% lost as belowground respiration and 7.3% remained in the soil. In the four carbon pools (i.e., shoots, living roots, dead roots, and soil pools), living roots consistently had the highest proportion of 13C in the plant-soil system during the 32 days. Based on the 13C partitioning pattern and biomass production, we estimate a total of 4930 kg C ha-1 was allocated belowground during the vegetation growth season in this alpine meadow. Of this, roots accumulated 2868 kg C ha-1 and soils accumulated 613 kg C ha-1. This study suggests that carbon storage in belowground carbon pools plays the most important role in carbon cycles in the alpine meadow.
出处	Global Change Biology
卷	16
期	8
页	2322-2333
收录类别	SCI
语种	英语
ISSN号	1354-1013
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/22773]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Wu Y. B.,Tan H. C.,Deng Y. C.,et al. Partitioning pattern of carbon flux in a Kobresia grassland on the Qinghai-Tibetan Plateau revealed by field 13C pulse-labeling. 2010.

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