Analysis on soil respiration and its effect factors in the Hobq Sand Dune

Soil respiration is a very important aspect in mass circulation and energy flow through ecosystems; it is the main index of evaluating carbon dioxide change in atmospheres and soil biological activity. This paper determined and analyzed the soil respiration of Hobq sand dune in natural conditions of semiarid region, the results indicated that 1) the soil respiration rate was related to soil moisture, but it was unrelated to the soil temperature at small time scales in sand dune of semiarid region. 2) The soil respiration rate was related to bacterial population and azotobacter population, but it was unrelated to the epiphyte population and actinomyces population. 3) The soil respiration rate was related to vegetation biomass, including aboveground and underground biomass. This conclusion could help to realize the soil respiration and its effect factors in sand dune of semiarid region, and understand the material cycle and energy flow in terrestrial ecosystem.