江西省4种主要森林类型土壤有机碳特征比较

利用64个样地实测数据,运用SPSS软件,以江西省杉木林、马尾松林、阔叶林、针阔混交林4种主要森林类型为研究对象,比较分析了土壤有机碳分布特征及其与土壤容重的关系。结果表明:江西省4种主要森林类型的土壤有机碳含量在1 m土壤剖面分布均表现为:表层>亚表层>底层,森林土壤有机碳主要分布在土壤表层,在同一土壤层次均表现为阔叶林>针阔混交林>杉木林>马尾松林,不同森林类型和土壤层次有机碳含量差异性明显;4种森林类型在不同土壤层次土壤有机碳含量均与容重呈显著负相关;森林土壤有机碳密度阔叶林(13.2265±1.18197 kg/m2)>针阔混交林(11.1804±1.78677 kg/m2)>杉木林(9.1065±1.18197 kg/m2)>马尾松林(6.2019±0.94853 kg/m2),不同森林类型的土壤有机碳密度差异性显著,江西省主要森林类型的土壤有机碳密度为10.1740±0.6935 kg/m2。

Comparison of Soil Organic Carbon Characteristics under 4 Major Forest Types in Jiangxi Province

According to the measured data of 64 surveyed sample plots, using SPSS software, taking Chinese fir forest, masson pine forest, broadleaf forest, mixed broadleaf -conifer forest in Jiangxi as research objects, the author analyzed the distribution characteristics of soil organic carbon and its relationship with soil bulk density.The soil organic carbon content in 1-m soil profile distribution of above four forest types all showed the following trend：surface soil layer＆gt;subsurface soil layer＆gt;bottom soil layer, namely the organic carbon of forest soil was distributed mainly in the surface soil layer.The organic carbon content in the same soil layer of different forest types revealed the following order：broadleaf forest＆gt;mixed broadleaf-conifer forest＆gt;Chinese fir forest＆gt;masson pine forest.There was obvious difference in soil organic carbon content among various forest types as well as among different soil layers.The organic carbon content in different soil layers of four forest types all was significantly negatively correlated with soil bulk density.As for the organic carbon density of forest soil, four forest types could be ranked as follows：broadleaf forest （13.2265 kg/m2 ＆#177;1.18197 kg/m2）＆gt;mixed broadleaf-conifer forest （11.1804 kg/m^2 ±1.78677 kg/m^2）〉Chinese fir forest （9.1065 kg/m^2 ±1.18197 kg/m^2）〉masson pine forest （6.2019 kg/m^2 ±0.94853 kg/m^2）.There was significant difference in soil organic carbon density among different forest types, and the average soil organic carbon density of main forest types in Jiangxi province was （10.1740±0.6935） kg/m^2 .