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The Gonghe Basin is a sandified and desertified region of China, but thedistribution of soil organic carbon (SOC) and total nitrogen (TN) along thecultivation chronosequence across this ecologically fragile region is notwell understood. This study was carried out to understand the effects ofrestoration with Salix cheilophila for different periods of time (6, 11, 16, 21 years) totest whether it enhanced C and N storage. Soil samples, in four replicationsfrom seven depth increments (0–10, 10–20, 20–30, 30–50, 50–100,100–150 and 150–200 cm), were collected in each stand. Soil bulk density,SOC, TN, aboveground biomass and root biomass were measured. Resultsindicated that changes occurred in both the upper and deeper soil layerswith an increase in revegetation time. The 0–200 cm soil showed that the6-year stand gained 3.89 Mg C ha−1 and 1.00 Mg N ha−1, whichaccounted for 40.82% of the original SOC and 11.06% of the TN of the0-year stand. The 11-year stand gained 7.82 Mg C ha−1 and 1.98 Mg N ha−1 in the 0–200 cmsoil layers, accounting for 58.06% of the SOCand 19.80% of the TN of the 0-year stand. The 16-year stand gained 11.32 Mg C ha−1 and3.30 Mg N ha−1 in the 0–200 cm soil layers,accounting for 66.71% of the SOC and 21.98% of the TN of the 0-yearstand. The 21-year stand gained 13.05 Mg C ha−1 and 5.45 Mg N ha−1from the same soil depth, accounting for 69.79% of the SOC and40.47% of the TN compared with the 0-year stand. The extent of thesechanges depended on soil depth and plantation age. The results demonstratedthat, as stand age increased, the storage of SOC and TN increased. Theseresults further indicated that restoration with S. cheilophila has positive impacts on theGonghe Basin and has increased the capacity of SOC sequestration and Nstorage. The shrub's role as carbon sink is compatible with system managementand persistence. The findings are significant for assessing C and Nsequestration accurately in semi-arid degraded high, cold sandy regions inthe future

solid earth

Changes in soil organic carbon and nitrogen capacities of &amp;lt;i&amp;gt;Salix cheilophila&amp;lt;/i&amp;gt; Schneid along a revegetation chronosequence in semi-arid degraded sandy land of the Gonghe Basin, Tibet Plateau