Changes in soil organic carbon in the upper Heihe river basin, China

YY Qin, Qi Feng, NM Holden, JJ Cao

Abstract


The Heihe River Basin is a globally significant carbonpool, but its soil organic carbon dynamics is poorly understood. Soilsamples taken between 2500 m and 4100 m revealed that the majority(>75%) of soil organic carbon was from 0-40 cm. It showed anegative relationship with pH and soil bulk density, and a positiverelationship with altitude and soil water content, respectively. From2005 to 2011, soil carbon content in the upper catchment decreasedfrom 93 g/kg to 53 g/kg. These results suggest that policies shouldaim to reduce carbon loss by transferring it from the top- to thesub-soil.

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Phyton. International Journal of Experimental Botany. ISSN print 0031-9457 ISSN en line 1851-5657 Fundación Rómulo Raggio Gaspar Campos 861,  Vicente López, Buenos Aires, Argentina (C.P. 1638) Tel 54 11 4791-0868 / 4796-1456 revistaphyton@fund-romuloraggio.org.ar www.revistaphyton.fund-romuloraggio.org.ar