Abstract: By the method of infrared CO2 determination in closed dynamic chamber system, the soil respiration in natural spruce forest, and 22-， 35-and 65-year old spruce plantations in eastern Qinghai-Tibet plateau was measured in situ, and the soil heterotrophic and autotrophic respiration was differentiated by entrenchment. In the four spruce forests, soil respiration rate had a significant positive exponential correlation with the soil temperature at depth 5 cm, but less correlation with the soil moisture content at the same depth. The annual soil respiration flux was 79208-107020 g C·m-2·a-1, and decreased in the order of natural spruce forest＞22-year old spruce plantation＞65-year old spruce plantation＞35-year old spruce plantation. The annual soil autotrophic and heterotrophic respiration fluxes were 25336〖KG-*2〗-〖KG-*7〗35705 g C·m-2·a-1 and 53869〖KG-*2〗-〖KG-*7〗70382 g C·m-2·a-1, respectively, and had the same variation trend as the annual soil respiration flux. The Q10 value of soil respiration in 22-, 35-, and 65-year old spruce plantations and in natural spruce forest in growth season (from Nov. 2007 to Mar. 2008) and non-growth season (from Apr. 2008 to Oct. 2008) were 459, 654, 477, and 318, and 417, 466, 311, and 274, respectively. Except that in 22-year old spruce plantation, the Q10 value was decreased with increasing restoration year, and was obviously higher in non-growth season than in growth season.

Key words: spruce plantation, soil respiration, soil autotrophic respiration, soil heterotrophic respiration, industrial transformation., eco-efficiency, resource-based area, industrial agglomeration