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以流动沙丘为对照,研究了科尔沁沙地25年生和35年生樟子松人工固沙林表层土壤(0～15cm)有机碳(SOC)和土壤轻组有机碳(LFOC)的变化.结果表明:流动沙丘造林后,粗沙含量明显降低,土壤极细沙和粘粉粒含量显著增加;SOC和LFOC含量均显著增加,但随土层加深趋于减少;流动沙丘造林显著增加了表层土壤的SOC和LFOC储量,且林龄越长,SOC和LFOC储量越高.人工林地0～15cm层LFOC储量的增幅远高于SOC储量,说明流动沙丘造林对表层土壤LFOC的影响大于SOC.
Using flow dunes as control, the changes of organic carbon (SOC) and soil organic matter (LFOC) in the 25 cm and 35-year-old Pinus sylvestris var. Mongolica artificial sand-fixation forests in Horqin sandy land were studied. After afforestation, the content of coarse sand decreased obviously and the content of soil very fine sand and sticky grain increased significantly. The contents of SOC and LFOC increased significantly, but decreased with the deepening of soil layer. The flowering dune afforestation significantly increased the SOC and LFOC And the longer the age, the higher the SOC and LFOC reserves.The increase of LFOC reserves in 0-15 cm layer of the plantation was much higher than that of SOC, which indicated that the effect of flow dune afforestation on the LFOC of topsoil was larger than that of SOC.