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研究了川西亚高山云杉(Picea asperata Mast.)人工林不同阶段(22、47、65年)及原始林表层(0～30cm)土壤有机碳的矿化,并用两室模型对实验数据进行了回归。结果表明,不同恢复阶段云杉人工林各层土壤(0～10、10～20、20～30cm)有机碳64天累积释放的CO2-C显著大于原始林。两室模型模拟土壤有机碳矿化过程得出土壤活性有机碳(AC)含量及其占总有机碳含量的比例均大于原始林,表明原始林转化为云杉人工林后,土壤有机碳稳定性降低。此外,本文分析了凋落物、微生物、土壤理化性质等因素对云杉人工林土壤有机碳矿化的可能影响。
The mineralization of soil organic carbon in different stages (22, 47, 65 years) of Picea asperata Mast. Plantation and the surface layer of 0-30 cm of primary forest in western Sichuan was studied. The experimental data return. The results showed that the cumulative CO2-C release from soil organic carbon (0 ~ 10, 10 ~ 20 and 20 ~ 30cm) in all restoration stages of Picea mongolica plantation at 64 days was significantly greater than that of the original forest. The results of two-compartment model simulating soil organic carbon mineralization showed that the percentage of soil active organic carbon (AC) and its proportion of total organic carbon was higher than that of virgin forest, indicating that after conversion of primary forest to spruce plantation, the soil organic carbon stability reduce. In addition, the possible effects of litter, microorganisms and soil physicochemical properties on soil organic carbon mineralization in spruce plantations were analyzed.