The forest age as a factor affecting soil respiration is one of the hot issues in the carbon cycle, and forest age also plays an important role in simulating succession and monitoring the long-term carbon dynamic. We investigated soil respiration dynamics and characteristics in warm-temperate oak chronosequence in China, and measured soil respi-ration with a Li-Cor infrared gas analysis. We studied the effects of forest age on soil respiration flux and different com-ponents of Quercus aliena. The results showed that the seasonal patterns of soil respiration among the age classes of Q. aliena var. acuteserrata forest ( 40 a, 80 a,>160 a) and different components showed the obvious seasonal dynam-ics, and occurred as a unimodal curve. Soil respiration rate had a significantly exponential correlation to 5 cm soil tem-perature. This also could be explained by the effects of temperature on the activity of soil organisms. The exponential equations of soil temperature and soil respiration accounted for more than 80% of the variations in soil respirationrate. There was no significant variation in soil respiration and its components among different forest ages, and the sen-sitivity of soil respiration to temperature in different age chronosequence and soil components of Q. aliena var. acuteser-rata forest also had no significant difference, which might be explained by the fact that there was no significant differ-ence among the age classes of Q. aliena var. acuteserrata forest in soil properties, forest productivity and micro-envi-ronmental conditions. The cumulative soil respiration in treatment with doubled litter was significantly ( P<0. 05 ) higher than that of other components, which indicated that more litter could provide more abundant nutrient for the ac-tivity of soil microorganisms. There were also correlations of cumulative soil respiration with soil organic carbon ( SOC) , fine root biomass ( FR) and microbial respiration ( MR) , which indicated that the soil properties and under-ground metabolism could well enough to explain the pattern of soil respiration among the age classes of Q. aliena var. acuteserrata forest in this region.
国家科技期刊平台
NSTL
万方数据
维普
