油蒿群落土壤碳通量日动态变化特征

Diurnal Change of Soil Carbon Flux of Artemisia ordosica Community in the East of Kubuqi Desert

利用LI-8100土壤碳通量测量系统测定库布齐沙地东段油蒿群落土壤碳通量日动态,分析土壤碳通量变化特征及其与环境影响因子的相关性。结果表明:土壤碳通量日平均值变化范围为0.23～1.47μmol.m-2.s-1,在不同月份呈V型、单峰型或双峰型,最高值集中在8∶00～14∶00;在整个生长季,大气温度、0～10cm土壤温度、0～5cm土壤体积含水量都是沙地生态系统土壤碳通量的重要调控因子;土壤碳通量与大气温度、0～10cm土壤温度呈极显著指数相关,与0～5cm土壤体积含水量呈极显著线性相关。

Soil carbon flux of Artemisia ordosica community was measured using LI-8100 automated soil CO2 flux system in the east of Kubuqi desert.Diurnal changes of soil carbon flux and its environmental impact factors were analyzed.The results showed that the diurnal average of soil carbon flux ranged from 0.23 to 1.47mol·m-2·s-1 and the diurnal change curve presented v-shaped,or single peak or two peaks.The diurnal maximum of soil carbon flux emerged at between eight and fourteen.During growing season,the important regulative factors to soil carbon flux were air temperature,soil temperature（0-10 cm） and soil moisture（0-5 cm）.Soil carbon flux was significantly exponentially correlated with air temperature and soil temperature（0-10 cm） and was significantly linearly correlated with soil moisture（0-5 cm）.