Abstract: To select proper time periods at daily scale to measure soil respiration and take the measured average value to represent the daily average soil respiration can make the shortterm observed data be effectively applied in the estimation of soil respiration at yearly scale. By using 64-days diurnal observation data of soil respiration rate (R_s) under different vegetation types in Ebinur Lake area in 2007-2012, the representative time periods for measuring the R_s were selected, and the effectiveness was estimated. The selected representative time periods for measuring the R_s in freezing period, thawing period, and growth period were 9:00-13:00, 12:00-16:00, and 8:00-12:00, respectively. The differences between the average R_s values of representative time periods and of 24 hours in freezing period, thawing period, and growth period were 0.030, 0.004, and 0.039 μmol·m^-2·s^-1, and the relative differences were 1.94%, 0.86%, and 1.76%, respectively. Overlaying the R_s in representative time periods to yearly scale could represent the yearly soil carbon flux in Ebinur Lake area (R²=0.972). Our results could provide data support for the selection of the measurement time periods of soil respiration in temperate arid area, and also, provide theoretical basis for the objective evaluation of soil respiration in arid area.

Key words: dimethyl disulfide, Apolygus lucorum, behavioral manipulation., repellent, slow-release system