Increasing soil carbon stocks in eight permanent forest plots in China
2020
Abstract. Forest soils represent a major stock of organic carbon (C) in the
terrestrial biosphere, but the dynamics of soil organic C (SOC) stock are
poorly quantified, largely due to lack of direct field measurements. In this
study, we investigated the 20-year changes in SOC stocks in eight permanent
forest plots, which represent boreal (1998–2014), temperate (1992–2012),
subtropical (1987–2008), and tropical forest biomes (1992–2012) across
China. SOC contents increased significantly from the 1990s to the 2010s,
mostly in the upper 0–20 cm soil depth, and soil bulk densities do not
change significantly during the same period. As a result, the averaged SOC
stocks increased significantly from 125.2±85.2 Mg C ha −1 in the
1990s to 133.6±83.1 Mg C ha −1 in the 2010s across the forest
plots, with a mean increase of 127.2–907.5 kg C ha −1 yr −1 . This
SOC accumulation resulted primarily from increasing leaf litter and fallen
logs, which accounts 3.6 %–16.3 % of above-ground net primary production.
Our findings provided direct evidence that China's forest soils have been
acting as significant C sinks, although their strength varies in forests
with different climates.
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