【摘要】 为探讨不同森林植被类型对土壤活性有机碳库的影响,以北京山地典型针叶林和阔叶林为对象,对土壤有机碳含量与密度进行研究。结果表明:随土层深度增加,土壤总有机碳含量、土壤易氧化碳含量和土壤颗粒有机碳含量逐渐递减。在0～10cm和10～20cm土层内,阔叶林土壤有机碳含量均显著地高于针叶林土壤。土壤有机碳密度随土层深度变化的趋势与土壤有机碳含量的变化趋势相似,但针叶林与阔叶林之间不同深度土壤有机碳密度的差异没有规律性。土壤易氧化碳占土壤总有机碳的比率范围为0.36～0.45,土壤颗粒有机碳占土壤总有机碳的比率范围为0.28～0.73,且随土层深度增加比率减小。土壤活性有机碳与土壤总有机碳极显著相关,土壤易氧化碳与颗粒有机碳的相关性也极显著(P<0.01)。因此,阔叶林比针叶林能积累更多的土壤有机碳。更多还原

【Abstract】 In order to explore the effects of different forest types on soil active carbon pool,the content and density of soil organic carbon(SOC)were studied in different soil horizons under typical coniferous and broadleaved forests in the mountainous area of Beijing.The results showed that the content of total SOC,readily oxidizable carbon and particulate organic carbon decreased with increasing soil horizons,and the content in the depth of 0--10 cm and 10--20 cm under broadleaved forest was obviously higher than that under coniferous forest.The trend that SOC density decreased with increasing soil horizons was similar to that of SOC content.However,no regularity was found for SOC density in different depths between coniferous forest and broadleaved forest.The ratio of readily oxidizable carbon to total SOC content was in the range of 0.36--0.45,the ratio of particulate organic carbon to total SOC content was in the range of 0.28--0.73 and the ratios decreased with increasing soil horizons.The active SOC was significantly related to total SOC,and the relationship between readily oxidizable carbon and particulate organic carbon was significant.Broadleaved forest may offer more SOC than coniferous forest.更多还原