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作 者 ：姜发艳;孙辉;林波;刘庆

期 刊 ：应用生态学报 2009年 20卷 11期 页码：2581-2587

关键词：亚高山森林土壤；易氧化有机碳；微生物生物量碳；颗粒态有机碳；

Keywords:subalpine forest soil, easily oxidizable organic carbon, microbial biomass carbon, particulate organic carbon,

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.

Abstract:

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 ca
rbon 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) ontents in 0-10, 10-20, and 20-30 cm soil layers decreased from 35.89, 26.91, and 26.00 g·kg^-1 in primary 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·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 rimary 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 consumption.

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