JOBBAGY GAMPEL Esteban Gabriel
Soil inorganic carbon storage pattern in China
MI N; SQ WANG; JY LIU; GR YU; WJ ZHANG; EG JOBBÁGY
GLOBAL CHANGE BIOLOGY
Lugar: Londres; Año: 2008 vol. 14 p. 2380 - 2387
Soils with pedogenic carbonate cover about 30% (3.44 × 106 km2) of China, mainly across its arid and semiarid regions in the Northwest. Based on the second national soil survey (19791992), total soil inorganic carbon (SIC) storage in China was estimated to be 53.3±6.3 PgC (1 Pg=1015 g) to the depth investigated to 2 m. Soil inorganic carbon storages were 4.6, 10.6, 11.1, and 20.8 Pg for the depth ranges of 00.1, 0.10.3, 0.30.5, and 0.51 m, respectively. Stocks for 0.1, 0.3, 0.5, and 1 m of depth accounted for 8.7%, 28.7%, 49.6%, and 88.9% of total SIC, respectively. In contrast with soil organic carbon (SOC) storage, which is highest under 500800 mm yr−1 of mean precipitation, SIC storage peaks where mean precipitation is shrubland, cropland >marsh, forest, meadow. Densities of SIC increased generally with depth in all ecosystem types with the exception of deserts and marshes where it peaked in intermediate layers (0.10.3 m for first and 0.30.5 m for latter). Being an abundant component of soil carbon stocks in China, SIC dynamics and the process involved in its accumulation or loss from soils require a better understanding.