Study On The Pattern Of Soil CO₂ Respiration In Dahurian Larch Forest Of Frigid-temperate Zone

Soil respiration is the second largest flux in the global carbon cycle. The Dahurian larch larix gmelinii forests in the frigid-temperate zone is the main species and sensitive to the climate change, but the soil respiration for the Dahurian larch forest of Daxinganling in Inner Mongolia was not inadequately understood till now. We choose Dahurian larch forest zone as the case study area, our aim was to know the pattern of soil respiration and the main influential factor. The results showed that:1. Soil carbon release of Dahurian larch forest mainly focused on the top soil. The pattern of soil respiration shows obvious diurnal and seasonal variation in the frigid-temperate zone. The soil respiration showed single peak shape diurnally and the carbon released from soil to atmosphere was ranged as Augustï¹¥Julyï¹¥Septemberï¹¥June. The gross carbon released from soil was about 706 g cm-2.a-1.2. Soil respiration originates in the top soil in Dahurian larch forest of frigid-temperate zone, and soil respiration rates affected mainly by soil temperature. The results showed that there was significant correlations between soil respiration rates and the soil temperature at 10 cm soil layer (r=0.8795) and the moisture was not the main limited factor. Meanwhile, significant correlations between the atmosphere CO2 concentration of forest and the soil respiration rates(r=0.4261) was also been found.3. The Q10 value of soil respiration in Dahurian larch forest was relative higher compared with other areas, which suggested that the temperature has more important effects on the susceptive permafrost environment. More efforts should put in the response of frigid-temperate zone to the climate change in the further study.