Soil inorganic carbon stock in the Tibetan alpine grasslands

As the largest carbon pool in the terrestrial biosphere, soil carbon stock consists of organic and inorganic components. However, previous studies dominantly concentrated on soil organic carbon (SOC) stock, and little is known about the magnitude and patterns of soil inorganic carbon (SIC). In this...

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Bibliographic Details
Published in:Global Biogeochemical Cycles
Main Authors: Yang, Yuanhe, Fang, Jingyun, Ji, Chengjun, Ma, Wenhong, Su, Shenshen, Tang, Zhiyao
Other Authors: Yang, YH (reprint author), Peking Univ, Dept Ecol, Coll Urban & Environm Sci, Beijing 100871, Peoples R China., Peking Univ, Dept Ecol, Coll Urban & Environm Sci, Beijing 100871, Peoples R China., Peking Univ, Minist Educ, Coll Urban & Environm Sci, Key Lab Earth Surface Proc, Beijing 100871, Peoples R China., Inner Mongolia Univ, Coll Life Sci, Hohhot 010021, Peoples R China.
Format: Journal/Newspaper
Language:English
Published: global biogeochemical cycles 2010
Subjects:
ORGANIC-CARBON
CLIMATE-CHANGE
STORAGE
CHINA
PERMAFROST
NITROGEN
PLATEAU
TEMPERATURE
SENSITIVITY
DYNAMICS
permafrost
Online Access:https://hdl.handle.net/20.500.11897/322358
https://doi.org/10.1029/2010GB003804
Description
Summary:As the largest carbon pool in the terrestrial biosphere, soil carbon stock consists of organic and inorganic components. However, previous studies dominantly concentrated on soil organic carbon (SOC) stock, and little is known about the magnitude and patterns of soil inorganic carbon (SIC). In this study, we evaluated the magnitude of SIC stock in the Tibetan alpine grasslands using data from 405 profiles surveyed from 135 sites across the plateau during 2001-2004. Kriging interpolation was conducted to interpolate site-level observations to the regional level. We also compared spatial and vertical distributions of SIC stock with the corresponding patterns of SOC stock in the Tibetan alpine grasslands. Our results showed that SIC stock in the top 1 meter in the Tibetan alpine grasslands was approximately 15.2 Pg C (1 Pg = 10(15) g), with an average density (amount per area) of 13.46 kg C m(-2). SIC density exhibited different spatial and vertical distributions in comparison with SOC density. Spatially, SIC density in the alpine steppe was larger than that in the alpine meadow, in contrast to SOC distribution. Vertically, SIC stock in the upper 30 and 50 cm accounted for 47.6% and 71.6%, respectively, of that in the upper 1 meter, with lower proportions than that of SOC stock in the same interval (67.8% and 83.3%). In total, SIC stock in the Tibetan alpine grasslands was about 2.1 times the corresponding SOC stock, accounting for 28.5% of the total SIC stock in China. These results highlight that SIC stock in the Tibetan grasslands could make a significant contribution to China's terrestrial carbon balance. http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000285015900001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 Environmental Sciences Geosciences, Multidisciplinary Meteorology & Atmospheric Sciences SCI(E) 12 ARTICLE null 24

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