荒漠生物结皮-土壤系统温室气体(CO2、CH4和N2O)通量数据的缺乏,给区域尺度上温室气体通量的估算带来很大的不确定性.2011—2012年在腾格里沙漠东南缘沙坡头地区不同时期建植的人工植被固沙区,采用静态箱-气相色谱法研究了不同类型和不同演替阶段生物结皮覆盖的土壤CO2、CH4和N2O的通量特征.结果表明:结皮类型、恢复时间及二者与采样时间的互作显著影响CO2通量;恢复时间、结皮类型与采样时间的互作显著影响CH4通量;采样日期显著影响CO2、CH4和N2O通量.苔藓结皮年均CO2通量(105.1 mg·m-2·h-1)显著高于藻类结皮(37.7 mg·m-2·h-1).荒漠生物结皮-土壤系统年均CH4和N2O吸收通量分别为19.9和3.4μg·m-2·h-1.藻类结皮的年均CH4和N2O吸收通量略高于苔藓结皮,但差异并不显著.随着荒漠生物结皮的发育和演替的深入,生物结皮-土壤系统呼吸逐渐增加,CH4和N2O吸收能力逐渐下降.与藻类结皮相比,苔藓结皮呼吸对温、湿度的变化更为敏感,且随着生物结皮的发育和演替的深入逐渐增强.温度和湿度不是决定荒漠生物结皮-土壤CH4和N2O通量的关键因子. Lack of data on desert biological crust-soil system fluxes of greenhouse gases (CO2, CH4 and N2O) gives great uncertainty to the estimation of greenhouse gas fluxes at the regional scale. In the 2011 to 2012 deserts in the Tengger Desert The fluxes of soil CO2, CH4 and N2O fluxes covered by different types and different succession stages of biological crusts were studied by static box-gas chromatography (GC-MS) in the artificial vegetation-fixing area built in different periods in Shapotou area, : The type of crust, the recovery time and their interaction with the sampling time significantly affect the CO2 flux; the recovery time, the interaction between the crust type and the sampling time significantly affect the CH4 flux; the sampling date significantly affects the CO2, CH4 and N2O fluxes The mean annual CO2 flux of moss crust (105.1 mg · m-2 · h-1) was significantly higher than that of algal crust (37.7 mg · m-2 · h-1) CH4 and N2O fluxes were 19.9 and 3.4 μg · m-2 · h-1, respectively.The average annual CH4 and N2O flux of algal crusts was slightly higher than that of moss crusts, but the difference was not significant With the development and succession of crusts, the bio-crust-soil system respiration gradually increased, and the absorption capacity of CH4 and N2O decreased gradually. Compared with algal crusts, the respiration of moss crust was more sensitive to temperature and humidity changes, and gradually increased with the development and succession of biological crusts. Temperature and humidity were not the determinants of desert crust-soil CH4 and N2O fluxes The key factor of quantity.