凤阳山不同植被恢复方式对土壤有机碳及其组分的影响

Effects of Different Vegetation Restoration Models of Fengyang Mountain on Soil Organic Carbon and Its Components

以凤阳山自然保护区典型常绿阔叶林与杉木林、柳杉林与针阔混交林为研究对象,研究同一采样点不同植被恢复方式下土壤总有机碳、易氧化有机碳、稳定态有机碳的变化特征。结果表明:总体上,常绿阔叶林土壤总有机碳质量分数高于杉木林,柳杉林高于针阔混交林;常绿阔叶林0<h≤60 cm层单位面积土壤总有机碳储量比杉木林高出10.76%,柳杉林比针阔混交林高出4.05%。常绿阔叶林0<h≤20 cm、20 cm<h≤40 cm层土壤易氧化有机碳质量分数分别为1 518.47和786.63 mg/kg,显著高于杉木林同层的1 302.94和655.74 mg/kg(p<0.05);柳杉林0<h≤20 cm、20 cm<h≤40 cm层易氧化有机碳质量分数分别为1 342.36和540.35 mg/kg,显著低于针阔混交林同层的1 618.92和586.63 mg/kg(p<0.05)。常绿阔叶林0<h≤20 cm、20 cm<h≤40 cm层土壤稳定态有机碳质量分数分别为2.23和1.60 g/kg,显著高于杉木林同层的1.52和1.10 g/kg(p<0.05);柳杉林0<h≤20 cm、40 cm<h≤60cm层稳定态有机碳质量分数分别为2.36和1.31 g/kg,显著高于针阔混交林同层的1.84和1.02 g/kg(p<0.05)。随着土层加深,土壤总有机碳、易氧化有机碳、稳定态有机碳质量分数整体呈逐渐降低趋势。

With evergreen broad-leaved forest and Cunninghamia lanceolata forest, coniferous and broad-leaved mixed forest and Cryptomeria fortunei forest in national nature reserve of Fengyang Mountain, we investigated the variation characteristics of total organic carbon, readily oxidized and recalcitrant organic carbon under different vegetation restoration models of the same sampling spot. The total organic carbon of evergreen broad-leaved forest was higher than that of Cunninghamia lanceolata forest, and that of the Cryptomeria fortunei forest was higher than that of coniferous and broad-leaved mixed forest. The unit area reserves of total organic carbon of evergreen broad-leaved forest and Cryptomeria fortunei forest increased by 10.76% and 4.05% in 0-60 cm layer, respectively. The readily oxidized organic carbon of evergreen broad-leaved forest in the 0-20 and 20-40 cm layers were 1 518.47 and 786.63 mg/kg, higher than that of Cunninghamia lanceolata forest （1 302.94 and 655.74 mg/kg）, respectively （ p 〈0.05）. The readily oxidized organic carbon of Cryptomeria fortunei forest in the 0-20 and 20-40 cm layers were 1 342.36 and 540.35 mg/kg layers, lower than that of coniferous and broad-leaved mixed forest （1 618.92 and 586.63 mg/kg）, respectively （ p 〈0.05）. The recalcitrant organic carbon of evergreen broad-leaved forest in the 0-20 and 20-40 cm layers were 2.23 and 1.60 g/kg, higher than that of Cunninghamia lanceolata forest （1.52 and 1.10 g/kg）, respectively （ p 〈0.05）. The recalcitrant organic carbon of Cryptomeria fortunei forest in the 0-20 and 40-60 cm layers were 2.36 and 1.31 g/kg, higher than that of coniferous and broad-leaved mixed forest （1.84 and 1.02 g/kg）, respectively （ p 〈0.05）. The total organic carbon, readily oxidized carbon and recalcitrant organic carbon of all vegetation restoration models showed decreasing trends with the increasing of the soil depth.