Responses of feldspathic sandstone and sand-reconstituted soil C and N to freeze–thaw cycles

Abstract The Mu Us Desert in China is significantly affected by seasonal freeze–thaw processes. In order to evaluate the adaptation potential of reconstituted soil with different proportions feldspathic sandstone and sand extreme environment, laboratory simulation freeze-thaw experiments was conducted study characteristics C N under conditions. results showed that content organic matter reached peak after two cycles freezing thawing T1, T2 T3, compared before cycle, increased 70, 55 59%. After ten thawing, T3. one cycle nitrogen peak. contents ammonium 10, 49 11%, nitrate 14, 39 34% conclusion, short-term accumulation carbon reconstructed ratios sand, T3 treatments had better retention performance on nitrogen, which has a good adaptability environment.