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Soil Respiration

Otgonsuren Avirmed

Question

What are the soil respiration rates of the study areas, i.e., how much carbon dioxide is released from the soils in grazed and in non-grazed areas?

Methods:

Soil respiration measurements were done using soil respiration system from PP Systems. This system consists of infrared gas analyzer, chamber and soil temperature probe. Measurements were done along transects of steppe, riparian and forest zones of the study valleys.

Results and Discussion

soil respiration in Hovsgol taiga

Figure 1: Soil Respiration in forest

Soil respiration and atmospheric carbon dioxide amount of forest zone of the study valleys is shown in the graph above. Both soil respiration and atmospheric carbon dioxide amount were highest in Shagnuul valley, where the oldest forest is growing. Soil respiration in Noyon and Sevsuul valleys were lower than of atmospheric carbon dioxide. These are the valleys that have been most affected by forest fire.

Soil respiration of the steppe zones of the study valleys shows that soil respiration was higher in grazed valleys in 2003, but the same results were not observed in 2004. The highest soil respiration was measured in Borsog (a reference valley) in 2004.

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