以黄土高原侵蚀坡耕地(坡地1和坡地2)为对象,选择土壤温度和水分变化较为剧烈的初春3月,采用137Cs和210Pbex示踪技术,在确定的侵蚀和堆积区布设有根和无根2种处理,利用Li-8100土壤碳通量自动测量系统原位监测土壤呼吸,同时监测土壤温度和水分变化。与侵蚀区比较,观测期间堆积区有根和无根处理土壤CO2排放通量均有明显增加,只是这种增加有时没有达到统计上的显著水平。土壤堆积使坡地1有根和无根处理区土壤CO2排放通量分别增加了24.43%(由8.02%至44.41%)和23.95%(由6.37%至43.26%);土壤堆积使坡地2有根和无根处理区土壤CO2排放通量分别增加了44.64%(由17.33%至74.63%)和25.28%(由10.23%至39.76%)。3月份坡耕地侵蚀区和堆积区土壤呼吸随观测时间的变化与土壤温度和水分密切相关,但是,在整个观测期间侵蚀区和堆积区的土壤水分和温度没有差异,研究揭示了坡耕地土壤呼吸空间变化的土壤侵蚀驱动机理。 Taking the sloping arable land (slope 1 and slope 2) on the loess plateau as the object, early March in March, with 137Cs and 210Pbex tracing techniques, was selected to determine root erosion and accumulation area Two treatments were conducted to monitor soil respiration in situ using Li-8100 soil carbon flux automatic measurement system while monitoring soil temperature and moisture changes. Compared with the eroded area, the fluxes of soil CO2 with and without roots in the depositional area increased significantly during the observation period, except that the increase did not reach a statistically significant level. Soil accumulation increased the soil CO2 emissions by 24.43% (from 8.02% to 44.41%) and 23.95% (from 6.37% to 43.26%) in the rooted and non-rooted areas of slope 1; The soil CO2 fluxes in the non-root treatment areas increased by 44.64% (from 17.33% to 74.63%) and 25.28% (from 10.23% to 39.76%), respectively. Soil respiration during the observation period was closely related to soil temperature and moisture. However, there was no difference in soil moisture and temperature between the erosion area and the accumulation area during the whole observation period. The study revealed that soil respiration in sloping farmland Spatial Variability of Soil Erosion Driving Mechanism.