Based on the rate of soil redistribution at a sloping farmland using
~(137)Cs Tracer Technique and spatial variation of soil
organic carbon(SOC) and total nitrogen(TN),the spatial distribution of SOC and TN loss and the budget between transportation and accumulation for recently 50 years was calculated.The results showed that the rate of soil redistribution ranged from-24.61 t/hm~2/a to 33.56 t/hm~2/a,most of study area was in medium and weakly erosion phase and accounted for 83.66%;and the area of soil deposition accounted for 15.62%;The variation of the loss of SOC and TN was consistent with that of soil redistribution,shoulder-slope had the most serious loss with the rate of 407.57 kg/hm~2/a for SOC and 39.94 kg/hm~2/a for TN,back-slope and summit had the secondly loss with the average rate of 244.2 kg/hm~2/a for SOC and 17.93 kg/hm~2/a for TN,foot-and toe-slope had soil deposition with the average rate of-207.2 kg/hm~2/a for SOC and-20.56 kg/hm~2/a for TN.For the whole area,relative loss of SOC and TN more than 50% accounted for 10.45% and 11.21%,respectively;The net loss of sediment in the study area was 45.54 t/a for recent 48 years,among which SOC and TN were 612.62 kg/a and 47.20 kg/a,respectively,which was 52% more than that of without consideration of the enrichment of sediment on soil organic matter.