title: [Effects of compaction on diurnal variaaton of soil respiration in Larix gmellini plantation in summer].
abstract: Taking the Larix gmellinii plantation in the experimental forest farm of Northeast Forestry University as test object, and by using Li-8100 automatic instrument, the daily CO2 emission rate of soil in summer under different degrees of man-made compaction was measured, with the regression models established. There were significant differences in the diurnal variation of soil respiration rate under different degrees of man-made compaction. In CK (no compaction), the maximum value of soil respiration appeared at 15:30-17:30, and the minimum value appeared at 03:30-05:30, which were obviously lagged behind those in compaction treatments. The maximum and minimum values of soil respiration rate in main roads appeared at 09:30-11:30 and 23:30-01:30, and those in branch roads appeared at 11:30 and 01:30-03:30, respectively. In all treatments, soil respiration rate had significant correlations with surface temperature, relative humidity, and the temperature at 10 cm soil depth, but the correlation with the soil moisture at 5 cm depth tended to be not significant when the compaction degree was increasing. Compaction altered surface soil physical structure, decreased surface soil CO2 release rate.
authors: Heilongliang Province Key Laboratory of Sustainable Forest Management and Environment Microorganism Engineering, Northeast Forestry University, Harbin 150040, China. hena_nefu@126.com
authors: Na
authors: N
authors: He
authors: Li-hai
authors: LH
authors: Wang
mesh_terms: D002245:Carbon Dioxide / Q000032:analysis*; D019069:Cell Respiration; D002940:Circadian Rhythm; D002947:Cities; D006802:Human Activities; D028221:Larix / Q000502:physiology*; D012621:Seasons; D012987:Soil / Q000032:analysis*
chemical_list: D012987:Soil; D002245:Carbon Dioxide