Does land use age influence carbon cycling in the Tibetan Plateau?

Although substantial information had been generated on the effects of land use change on soil organic carbon (SOC) and total nitrogen (TN) storage, studies are absent on multifactorial effects of land use types, land use age, and elevation on SOC and TN storage. SOC and TN were therefore investigated in 30 field sites comprising natural forests, planted forests, shrub, and grasslands. SOC and TN stocks differed and correlated significantly with land use age; the C stocks correlates significantly with land use change compared the TN stocks. However, there was no relation between the C and N stocks with elevation, implying that SOC and TN are solely dependent on land use age. SOC sequestration potentials of the sampled ecosystems were 345.86, 293.19, 266.45, and 251.23 t ha−1 for the natural forests, planted forests, shrub, and grasslands with total mean value of 289.18 t·ha−1 (1,060.42 t·ha−1 CO2−eq). A significant SOC stock loss (17.96%, 29.80%, and 37.66%) occurred in converting natura...