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基于新疆古尔班通古特沙漠南缘原始盐生旱生荒漠的3种建群灌木琵琶柴(Reaumuria soongori-ca)、多枝柽柳(Tamarix ramosissima)和梭梭(Haloxylon ammodendron)生态系统下土壤剖面实测数据,分析了土壤有机碳(SOC)和土壤微生物量碳(Mc)的垂直分布特征及其与土壤理化因子的关系。结果表明:3个生态系统类型之间土壤剖面SOC分布状况和含量不存在显著差别,但每个生态系统土壤剖面土层之间存在显著差别。各生态系统土壤上层均存在着一定厚度的SOC富集层,中部(10～30cm)SOC含量迅速下降,下部有机碳含量低而稳定。Mc分布与含量与SOC存在相似的规律。Mc对90cm以上的土壤碳循环起着重要的作用,而对深层次的碳库影响不大,不会对全球变化做出响应,但意义更重要,它们可以更长期保留于土壤中而不释放回大气圈。
Based on the three established shrubs of Reaumuria soongori-ca, Tamarix ramosissima and Haloxylon ammodendron in the southern margin of the Gurgaon desert in Xinjiang, The vertical distribution of soil organic carbon (SOC) and soil microbial biomass carbon (MC) and its relationship with soil physical and chemical factors were analyzed. The results showed that there was no significant difference in the distribution and content of soil SOC between the three ecosystem types, but there was a significant difference between the soil profiles of each ecosystem. There is a certain thickness of SOC-rich layer in the upper layer of soils in all ecosystems. The SOC content in the middle (10-30 cm) decreases rapidly and the lower organic carbon content is low and stable. The distribution and content of Mc are similar to those of SOC. Mc plays an important role in the soil carbon cycle above 90cm, but has little effect on deep carbon pools and does not respond to global changes, but in a more important sense, they can be retained in the soil for longer periods of time without release Back to the atmosphere.