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Scientia Silvae Sinicae ›› 2014, Vol. 50 ›› Issue (11): 182-187.doi: 10.11707/j.1001-7488.20141124

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Characteristics of Soil Respiration in Three Types of Stands in Lanlingxi Small Watershed in Three Gorges Reservoir Area

Han Haiyan1, Zhang Tao2, Wang Pengcheng3, Lei Jingpin4, Zeng Lixiong5, Huang Zhilin5, Xiao Wenfa5   

  1. 1. Institute of Desertification Studies, CAF Beijing 100091;
    2. Institute of Forestry Survey and Design of Enshi Enshi 445000;
    3. College of Horticulture and Forestry, Huazhong Agricultural University Wuhan 430070;
    4. Research Institute of Foresty, CAF Beijing 100091;
    5. Research Institute of Forest Environment and Protection, CAF Beijing 100091
  • Received:2013-07-13 Revised:2014-09-22 Online:2014-11-25 Published:2014-12-04

Abstract:

In this study, the trenching method and infrared gas exchange analyzer were used to research the characteristics of soil respiration in 3 different types of stands including coniferous forest, broad-leaved forest and conifer-broadleaved forest in Lanlingxi small watershed in Three Gorges Reservoir Area of China. The results indicated that the annual total soil respiration (Rtotal), root respiration (Rroot), aboveground litter decomposition (Rlitter) and soil organic matter (SOM) decomposition (RSOM) of coniferous forest were 1.61, 0.47, 0.38, 0.76 μmol·m-2 s-1, respectively. The annual Rtotal,Rroot,Rlitter and RSOM were 1.47,0.35,0.16,0.96 μmol·m-2 s-1 for broad-leaved forest and 2.04,0.76,0.48,0.80 μmol·m-2 s-1 for conifer-broadleaved forest, respectively. The respiration rates of soil and its components displayed obvious seasonal dynamics with maximum rate in summer and minimum rate in winter. Soil temperature was the main factor that affected soil and its components respiration rates, and there were significant positive exponential relationships between them (P<0.05). The annual Q10 of Rtotal,Rroot,Rlitter and RSOM were 2.01,1.52,2.73 and 3.03 for coniferous forest,2.51,1.42,3.46,3.08 for broad-leaved forest and 1.86,1.14,3.00,2.32 for conifer-broadleaved forest, respectively. These results suggested that the annual Q10 value of Rroot in the three types of stands was significantly lower than that of the total soil respiration and its other components respiration (P<0.05).

Key words: soil respiration, root respiration, litter decomposition, soil organic matter decomposition, temperature sensitivity

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