Responses of Soil Respiration Rates of Four Plant Communities to Grazing Prohibition in Deserted Grassland
Dynamic closed chamber IRGA method is used to study the relationship between soil respiration and temperature of four deserted grassland communities, i. e. , Artemisia desertorum, Leymus secalinus, Glycyrrhiza uralensis and Agropyron crisatum, in grazing and enclosed plots, and reveal their effects on soil respiration in enclosed plots. The main results are as follows: The diurnal patterns of soil respiration rate in grazing and enclosed plots manifest a single-peak asymmetric curve and the maximum soil respiration rate occurs at 14:00-16:00. Soil respiration rates in enclosed plots are higher than those in grazing plots, but the significant differences are distinct in the communities of the grazing and the enclosed plots at certain time. The correlation between soil temperature and soil respiration rates at 10 and 15 cm depths are higher than that at 5 and 20 cm depths. At 15 cm depth, air temperature is well correlated with soil respiration rate. Besides the Artemisia desertorum community, the Q10 values of other plant communities in grazing plots are remarkably lower than those in enclosed plots. The Q10 values are in the order of Artemisia desertorumLeyrnus secalinus lycyrrhiza uralensis Agropyron crisatum. The Q10 value of Artemisia desertorurn community is greatly above other communities.
国家科技期刊平台
NSTL
万方数据
维普
