荒漠—绿洲过渡带典型混交灌木根区土壤含水率变化特征麻进，胡广录,陈海志，焦娇

土壤水分是干旱区植被生长的限制因子，研究荒漠—绿洲过渡带植被根区土壤水分时空变化对抵御沙漠化进程具有重要意义。以荒漠-绿洲过渡带3种典型混交灌木梭梭×泡泡刺(SS×PP)、泡泡刺×沙拐枣(PP×SG)、沙拐枣×梭梭(SG×SS)为研究对象，对3种典型混交灌木根区0～100 cm土层土壤进行连续采样并测定土壤含水率。结果表明：1)7-9月，3种混交灌木根区0～100 cm土层土壤含水率的变化范围依次为：梭梭×泡泡刺0.54%～2.75%、1.06%～2.41%、0.73%～4.72%;沙拐枣×梭梭0.42%～2.59%、0.96%～2.35%、0.57%～3.58%;泡泡刺×沙拐枣0.31%～2.38%、0.56%～2.33%、0.79%～3.71%。3种混交灌木在0～60 cm土层土壤含水率随深度增加而增大，60～100 cm土层各类型混交灌木土壤含水率变化逐渐趋于稳定。2)7月，0～100 cm土层混交灌木梭梭×泡泡刺的土壤含水率显著高于沙拐枣×泡泡刺，9月，20～40、60～100 cm土层混交灌木沙拐枣×梭梭的土壤含水率显著低于其他2种混交灌木类型。3)3种混交灌木土壤持水能力大...

Variation Characteristics of Soil Moisture Content in the Root-Zone Soil of Typical Mixed Shrubs in the Desert-Oasis Transition Zone

Soil moisture is the limiting factor for vegetation growth in arid regions.It is of great significance to study the temporal and spatial changes of soil moisture in the root zone of vegetation in the desert-oasis transition zone to resist the process of desertification.In this paper,three typical mixed shrubs occurring in the desert-oasis transition zone were studied:Haloxylon ammodendron×Nitraria sphaerocarpa(SS×PP),Nitraria sphaerocarpa×Calligonum mongolicum(PP×SG) and Calligonum mongolicum×Haloxylon ammodendron(SG×SS).Soils in the 0-100 cm soil layer in the root zone of three typical mixed shrubs were continuously sampled and the soil moisture contents were measured.The results showed that 1) from July to September,the ranges of soil moisture content in the 0-100 cm soil layer in the root zone of the three mixed shrubs were as follows:SS×PP:0.54%-2.75% (July),1.06%-2.41% (August),0.73%-4.72% (September); SG×SS:0.42%-2.59%,0.96%-2.35%,0.57%-3.58%; SG×PP:0.31%-2.38%,0.56%-2.33%,0.79%-3.71%.From July to September,the soil moisture contents of the three types of fixing land plants in the 0-60 cm soil layer increased with soil depth,while the contents were gradually stable in the soil layer of 60-100 cm in three mixed shrubs.2) In July,the soil moisture content in the soil layer of 0-100 cm with SS×PP was significantly higher than that of SG×PP.In September,the soil moisture contents of SG×SS in the soil layers of 20-40 cm and 60-100 cm were significantly lower than those of other mixed types.3) The soil water-holding capacity of the three types of fixing land plants ranked as SS×PP>SG×PP>SG×SS.The results of this study can provide a scientific basis for the construction of windbreak and sand fixation vegetation in the desert-oasis transition zone.