中文摘要：

对川西亚高山云杉原始林及其皆伐迹地上云杉人工林不同演替阶段（22、47和65年）表层（0~30 cm）土壤碳储量及活性有机碳含量进行了分析.结果表明：在0~10、10~20和20~30 cm土层中,土壤总有机碳（TOC）储量分别由22年生云杉人工林的95.87、79.08和71.55 t.hm-2减少到65年生云杉人工林的56.12、34.75和31.06 t.hm-2,且47和65年生云杉人工林各层土壤TOC储量小于原始林（88.08、71.16和64.81 t.hm-2）;各层土壤易氧化有机碳（EOC）含量分别由原始林的35.89、26.91和26.00 g.kg-1减少到65年生云杉人工林的20.25、14.50和12.36 g.kg-1,土壤微生物生物量碳（MBC）含量由原始林的524.44、273.26和257.97 mg.kg-1减少到65年生云杉人工林的312.41、186.95和152.18 mg.kg-1,颗粒态有机碳（POC）含量由原始林的40.23、27.10和19.55 g.kg-1减少到65年生云杉人工林的12.33、7.31和5.32 g.kg-1.川西亚高山云杉原始林在转变为人工林后相当长的时间内,土壤有机碳及活性碳一直处于净消耗状态.

英文摘要：

Soil samples at 0-30 cm depth were collected from the primary spruce （Picea asperata） forest and its plantations at different succession stages （22-, 47-, and 65-year-old） in subalpine zone of western Sichuan Province to study the dynamic changes of soil organic carbon stock and labile organic carbon content. The soil total organic carbon （TOC） stocks in 0-10, 10-20, and 20- 30 cm soil layers decreased from 95.87, 79. 08, and 71.55 t · hm-2 in 22-year-old plantation to 56. 12, 34. 75, and 31.06 t · hm-2 in 65-year-old plantation, respectively, and the TOC stocks in these soil layers in 47 and 65-year-old plantations were less than those （88.08, 71.16 and 64. 81 t ·hm-2, respectively） in primary forest. The easily oxidizable organic carbon （EOC） contents in 0 -10, 10-20, and 20-30 cm soil layers decreased from 35.89, 26.91, and 26.00 g · kg-1 in pri- mary forest to 20.25, 14. 50, and 12.36 g · kg-1 in 65-year-old plantation, the microbial biomass carbon （MBC） contents decreased from 524.44, 273.26, and 257.97 mg 1· kg-1 in primary forest to 312. 41, 186. 95, and 152. 18 mg· kg-1 in 65-year-old plantation, and the particulate organic carbon （POC） contents decreased from 40.23, 27.10, and 19. 55 g · kg-1 in primary forest to 12.33, 7.31, and 5.32 g · kg-1 in 65-year-old plantation, respectively. The results suggested that within the long succession period of primary P. asperata forest to its plantations in the subalpine zone of western Sichuan Province, soil TOC and labile organic carbon were in the state of net con- sumption.