基于森林土壤碳清查的方法,研究了川西低山丘陵区马尾松(Pinus massoniana)、杉木(Cunninghamia lanceolata)、巨桉(Eucalyptus grandis)和柏木(Cupressus funebris)人工林土壤的有机碳密度,结果表明,4种人工林土壤各层有机碳含量介于(4.34±0.75)～(23.41±2.75)g·kg-1,并随土壤深度的增加而降低;马尾松、杉木、巨桉和柏木人工林1 m深度内土壤平均有机碳密度分别为(79.9±10.0)、(125.9±21.2)、(145.4±22.1)和(157.9±29.2)t·hm-2;柏木混交林的土壤有机碳密度显著增加,柏木-栎针阔混交林和柏木-慈竹混交林的土壤有机碳密度分别为(187.9±16.0)和(158.6±15.4)t·hm-2.%Investigations were implemented on soil organic carbon density in plantations of Pinus massoniana, Cunninghamia lanceolata, Eucalyptus grandis and Cyprssus funebris in the hilly region of the western Sichuan. The result showed that soil organic carbon content in the plantations decreased with depth and varied from 4.34 (±0.75) to 23.41 (±2.75) g/kg. Mean soil carbon density within 1 m of depth of the plantation of P. massoniana, C. lanceolata, Eu. grandis and C. funebris was 79.9 (±10.0) t/ha, 125.9 (±21.2) t/ha, 145.4 (±22.1) t/ha and 157.9 (±29.2) t/ha. Soil organic carbon density in mixed forest of C.funebris increased significantly.
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