Comparison Of Soil Respiration Of Main Forest Types With Different Hydrarch Successional Stages Of Original Pinus Korensis Forest In Xiaoxing’an Mountains

Forest soil respiration is a key factor affecting carbon balance of terrestrial ecosystem. It provides theoretical evidences for evaluating regional ecosystem carbon balance by studying the interaction between itself and surroundings. In our study, the main forest types of main forest types with different hydrarch successional stages of original Pinus korensis forest in Xiaoxing’an Mountains were chosen, i.e. Pruce-fir-Korean pine forest and birch secondary forest, to investigate the effect of soil moisture on the hydrarch successional stages by separating the composition of soil respiration and anglicizing the interaction between each respiration and environmental factors. The results are followed:The results indicated that each component of respiration in both Spruce-fir-Korean pine forest and birch secondary forest soil show a significant monthly dynamic characteristics with a single peak, with the maximum in July & August and the minimum in May & October. Temperature and each component of respiration in soil of the two forests at each depth show a significant exponential correlation (P<0.01) especially for the temperature in 5cm deep soil. There is no significant correlationship between soil moisture and each component of soil respiration in two forests, but the combined effect of soil temperature and soil moisture on respiration is generally revealed.Compared to Spruce-fir-Korean pine forest, birch secondary forest has a higher annual mean respiration rate and respiration fluxes in each component, indicating that each component of soil respiration rate and carbon emission decreased with the wet raw succession in xiao xing an ling region (Birch secondary forest→ Spruce-fir-Korean pine forest).Soil moisture and substrate quality have a significant effect on litter decomposition. Under a certain soil moisture conditions, the decomposition rate of three kinds of litter come with the order of:Korea pine<Abies<Birch. For the same species, the decomposition rate under different soil moisture come with the order of:5%<35%<65%<75%. We found a intensive trend in waterlogged condition(75%). Our results of soil respiration in different soil moisture is consist with other field experiments, the accumulative CO2 emission from soil performs as: 65%> 75%> 35%> 5%.