[目的]探讨不同植被恢复类型下土壤有机碳和水分含量特征及其关系，为毛乌素沙地植被恢复类型的选取提供科学依据。[方法]以毛乌素沙地自然恢复草地及沙蒿、沙柳、沙蒿×沙柳(灌灌混交)、樟子松、沙柳×樟子松(乔灌混交)为研究对象，并以裸沙地为对照，分析不同植被恢复类型对0-5。0 m 土层土壤剖面碳、水的影响及其相关性。[结果](1)植被恢复增加土壤有机碳含量，沙柳×樟子松、樟子松、草地、沙蒿×沙柳、沙柳、沙蒿依次降低，0-0。2 m 土层显著高于深层，表现为表聚效应;随着土层深度的增加，各植被类型的有机碳含量逐渐降低;沙蒿、沙柳、沙蒿×沙柳在0。8-2。2 m 土层范围内表现为碳损失。(2)不同植被恢复类型在深层均存在不同程度的水分亏缺，主要集中在1。0-3。0 m 土层，具体亏缺程度为沙柳×樟子松＞樟子松＞沙蒿×沙柳＞沙柳＞草地＞沙蒿。(3)根系是影响土壤有机碳含量和水分消耗的主要因素;土壤有机碳含量与土壤含水量在0-5。0 m 土层范围内负相关。[结论]植被固存有机碳以消耗深层土壤水分为代价，沙柳×樟子松固定同等单位量的碳消耗水分最少。因此，从土壤固碳和保水2个角度同时考虑，沙柳×樟子松在毛乌素沙地的植被恢复中具有较好的恢复效果。
Soil Organic Carbon and Moisture Effects of Different Vegetation Restoration Types in the Mu Us Sandy Land
[Objective]This study was aimed to explore the characteristics of soil organic carbon and moisture content under different vegetation restoration types and their relationships,and to provide a scientific basis for the selection of vegetation restoration models in the Mu Us sandy land.[Methods]Different vegetation、restoration types,including natural restoration of grassland and various plants such as Artemisia desertorum,Salix psammophila,A.desertorum S.psammophila mixed(shrub-shrub mixed),Pinus sylvestris,S.psammophila P.sylvestris mixed(tree-shrub mixed),in the Mu Us sandy land,were studied.Bare sand was used as the control.The effects and correlations of different vegetation restoration types on carbon and water in the 0-5.0 m soil profile were analyzed.[Results](1)Vegetation restoration increased,with S.psammophila P.sylvestris mixed,P.sylvestris,Grassland,A.desertorum S.psammophila mixed,A.desertorum S.psammophila mixed,and A.desertorum showing decreasing trends,with significant accumulation effects observed within the 0-0.2 m soil depth.As soil depth increased,the organic carbon content of all vegetation types gradually decreased.Within the depth range of 0.8-2.2 cm,A.desertorum,S.psammophila,and A.desertorum S.psammophila mixed exhibited carbon loss.(2)Different vegetation restoration types showed varying degrees of soil moisture deficit in deep soil layers,primarily concentrated at 1-3.0 m soil layer,with S.psammophila P.sylvestris mixed showing the most severe deficit,followed by P.sylvestris,A.desertorum S.psammophila,S.psammophila,Grassland,A.desertorum.(3)Roots were identified as the main factors influencing soil organic carbon content and moisture consumption.Soil organic carbon content exhibited a negative correlation with soil moisture within the 0-5.0 m soil depth range.[Conclusion]Vegetation carbon storage was achieved at the expense of utilizing deep soil moisture,with S.psammophila P.sylvestris mixed exhibiting the lowest water consumption per unit of fixed carbon.The study suggests that S.psammophila P.sylvestris mixed exhibits favorable effects in vegetation restoration from the perspective of soil carbon retention and water retention in the Mu Us sandy land.
vegetation restorationsoil organic carbonsoil moistureroot systemthe Mu Us Sandy Land
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