Lu B.,Northeast Forestry University |
Wang S.,WuYing Forestry and Meteorology Experiment Station |
Mao Z.,Northeast Forestry University |
Sun T.,Northeast Forestry University |
And 4 more authors.
Shengtai Xuebao/ Acta Ecologica Sinica | Year: 2010
In order to ascertain the carbon emission rate of total soil respiration (Rt), including soil microbial respiration (Rh), root respiration (Rr), litterfall respiration (R1) and their response influence on soil temperature and water content of four typical primary Korean pine forest communities at the Xiaoxing'an Mountain, trenching-plot and infrared gas exchange analyzer approaches were used to measure soil CO2 during the growing season. The results indicated that Rt Rh Rr and R1 of four primary Korean pine forest communities changed obviously seasonally. Rt, Rh, Rr of four communities were higher in July and September, lower in June and October. On average, contribution of Rhto Rt was 58. 8%, ranked first and the second was Rr(26. 5%), the third was R1 (12. 5%). There was significant correlation between Rt and soil temperature in 5cm depth in all plots during growing season (P < 0. 01). Q10 of Rr and Rh was 2. 88 and 2. 23, respectively showing that the root respiration was more sensitivity to soil temperature than that of microbial respiration. The average soil respiration rate in growing season of the four communities ranked: Tilia- Pinus koraiensis (6. 38μmol · m-2 · s -1) > Picea sp., Abies nephlolepis-Pinus koraiensis (6. 32μmol · m-2·s -1) > Betula costata-Pinus koraiensis (5. 95 μmol · m-2·s -1) > Quercus mongolica-Pinus koraiensis (2. 86μmol · m-2 · s-1). Rh and RT differed among the four primary Korean pine communities.