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对位于科尔沁沙地奈曼旗中部的沙漠化区域(S区)和舍力虎湖盆(潜在沙漠化区域,P区)表层土壤理化性质、0～100cm土壤有机碳(SOC)、全氮(TN)和土壤各级颗粒密度进行了对比分析;S区内设对照点MS、风蚀发生地TS和颗粒沉降地LS,P区内相应位置设为MC、NC和SC。结果表明:自西北向东南由以中粗沙组分为主的土壤向以粘粉粒和极细沙组分为主的土壤过渡;粘粉粒密度每减少1kg·m-2,SOC和TN密度分别下降10和1.1g·m-2;0～20cm土壤容重平均值在1.322～1.651g·cm-3变化,表现为TS>MS>LS>NC>SC>MC,粘粉粒含量表现出完全相反的趋势,pH表现为NC>SC>MC>S区;相对各区域的对照点,以风力侵蚀作用为主的TS和SC处SOC和TN含量及密度有不同程度的下降;同样以土壤可蚀性颗粒的沉降堆积作用为主,LS的SOC和TN含量及密度较TS和MS有明显的增加,而NC较SC和MC均大幅减少。S区土壤粘粉粒中的SOC和TN含量远高于P区,但风蚀引起的粘粉粒吹蚀和沙沉积对P区土壤质量的影响程度显著大于S区。区域自然条件下,特定的土地利用方式增大了潜在沙漠化土壤的风蚀风险,风蚀作用的持续效应导致了不同的土壤碳、氮储量变化。
Soil physical and chemical properties, soil organic carbon (SOC) and total nitrogen (TN) in the 0-100 cm soil layer in the desertification area (S area) and the Xilu tihu basin (potential desertification area and P area) in the central Naiman Banner of Horqin sandy land, And soil particle density at all levels were analyzed; S area with the control point MS, wind erosion occurred at TS and particle settlement to LS, P area within the corresponding location set to MC, NC and SC. The results showed that the soil from coarse to coarse sand components mainly changed from northwest to southeast to the soil composed mainly of sticky grain and fine sand components. When the density of sticky grain decreased by 1 kg · m-2, SOC and TN The density decreased by 10 and 1.1g · m-2, respectively. The average bulk density of soil from 0 to 20cm varied from 1.322 to 1.651g · cm-3, showing TS> MS> LS> NC> SC> MC, In the opposite trend, the pH value showed NC> SC> MC> S. Compared with the control points of each area, the content and density of SOC and TN in the TS and SC dominated by wind erosion decreased to some extent. Sedimentation and sedimentation of erodible particles are dominant. The contents and densities of SOC and TN in LS are significantly higher than those in TS and MS, while those in NC are significantly lower than those in SC and MC. The content of SOC and TN in the soil sticky particles in S zone is much higher than that in P zone. However, the effect of wind erosion on the soil quality in P zone was significantly greater than that in S zone due to wind erosion. Under the regional natural conditions, the specific land use pattern increases the risk of wind erosion in potentially desertified soils, and the persistent effects of wind erosion lead to different soil carbon and nitrogen reserves.