| 英文摘要: | Glob. Change Biol. http://doi.org/6nn (2015)
Soils contain the largest carbon stock in the terrestrial biosphere, so their response to climate change is important. However, soil carbon responses to warming from both modelling and experimental studies are mixed, and the net effect remains unclear.
To investigate recent trends in soil carbon dynamics, Leiyi Chen, from the Chinese Academy of Sciences, and co-workers compiled measurements from ~100 experimental studies on sites with constant land use. They found an overall increase in soil carbon content over the past few decades, with an average accumulation rate of 0.19% yr−1. This average conceals the variability between sites, with carbon increases in 43.1%, stability in 31.4%, and decreases in carbon for 25.5%. Soil carbon increases tended to occur in forests and grasslands (driven by a range of factors that lead to increases in biomass production) and decrease in croplands (related to changes in management such as reduced manure application and increased ploughing depth). These findings suggest that climate change has not yet resulted in soil carbon loss and is unlikely to trigger a strong positive climate feedback. |