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Soil organic carbon storage and soil CO$_{2}$ flux in the alpine meadow ecosystem

Content Provider	Springer Nature Link
Author	Tao, Zhen Shen, ChengDe Gao, QuanZhou Sun, YanMin Yi, WeiXi Li, YingNian
Copyright Year	2007
Abstract	High-resolution sampling, measurements of organic carbon contents and $^{14}$C signatures of selected four soil profiles in the Haibei Station situated on the northeast Tibetan Plateau, and application of $^{14}$C tracing technology were conducted in an attempt to investigate the turnover times of soil organic carbon and the soil-CO$_{2}$ flux in the alpine meadow ecosystem. The results show that the organic carbon stored in the soils varies from 22.12×10$^{4}$ kg C hm$^{−2}$ to 30.75×10$^{4}$ kg C hm$^{−2}$ in the alpine meadow ecosystems, with an average of 26.86×10$^{4}$ kg C hm$^{−2}$. Turnover times of organic carbon pools increase with depth from 45 a to 73 a in the surface soil horizon to hundreds of years or millennia or even longer at the deep soil horizons in the alpine meadow ecosystems. The soil-CO$_{2}$ flux ranges from 103.24 g C m$^{−2}$ a$^{−1}$ to 254.93 gC m$^{−2}$ a$^{−1}$, with an average of 191.23 g C m$^{−2}$ a$^{−1}$. The CO$_{2}$ efflux produced from microbial decomposition of organic matter varies from 73.3 g C m$^{−2}$ a$^{−1}$ to 181 g C m$^{−2}$ a$^{−1}$. More than 30% of total soil organic carbon resides in the active carbon pool and 72.8%281.23% of total CO$_{2}$ emitted from organic matter decomposition results from the topsoil horizon (from 0 cm to 10 cm) for the Kobresia meadow. Responding to global warming, the storage, volume of flow and fate of the soil organic carbon in the alpine meadow ecosystem of the Tibetan Plateau will be changed, which needs further research.
Starting Page	1103
Ending Page	1114
Page Count	12
File Format	PDF
ISSN	10069313
Journal	Science in China Series D: Earth Sciences
Volume Number	50
Issue Number	7
e-ISSN	18622801
Language	English
Publisher	Science in China Press
Publisher Date	2007-01-01
Publisher Place	Beijing
Access Restriction	Subscribed
Subject Keyword	Tibetan Plateau alpine meadow soil organic carbon CO$_{2}$ flux $^{14}$C signature Geosciences
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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