The Research on the Impact Factors of Low-Quality Stands Soil Respiration after Different Transformations in Greater Higgnan Mountains

Low-quality stands in Greater Higgnan Mountains were transformed by clear-cuttings with different area of forest gaps, then larch were planted after induced transformations. The LI-8150 multi-channel automated soil CO2 flux system was used to measure CO2 flux on soil surface. Changes of different soil respiration rates and influence factors were analyzed after different transformations. The results indicated that the soil respiration rates were all raised, after different transformations compared with no interfered control plots. After analyzing different transformations comprehensively, it showed that the soil respiration rate performed a negative correlation with the soil density significantly, while the correlation with soil organic matter and litter weight in little decomposed was positive (p < 0.05). The largest Q(10) with forest gap area of 625 m(2) was 3.561. Influenced by soil respiration rate, soil underground with depth of 10cm showed the strongest temperature sensitivity. The smallest Q(10) with forest gap area of 900 m(2) was 2.312, and temperature sensitivity of soil was the weakest.