海南岛灌丛土壤有机碳分布特征

Distribution Characteristics of Soil Organic Carbon in the Shrub Community of Hainan Island

海南岛土壤有机碳研究工作多集中在森林土壤,而灌丛土壤尚未引起足够重视。本文以海南岛24个灌丛样地的72个土壤剖面为研究对象,分析其有机碳含量、有机碳密度及其碳储量,以期揭示海南岛灌丛土壤有机碳的分布特征,并初步估算海南岛灌丛土壤的有机碳储量,为评价海南岛灌丛的重要生态价值提供理论依据。结果表明:海南岛灌丛土壤平均有机碳含量为(6.20±0.61)g/kg,平均土壤有机碳密度为5.94 kg/m^2;土壤有机碳含量及各土层统一到10 cm厚度的平均有机碳密度随土壤深度的增加而减少;海南岛灌丛土壤(100 cm)的有机碳储量约为1.48×10~7t。其中,土壤表层(0~30 cm)与(0~50 cm)的贡献率分别为46.15%和65.28%,与其它类型土壤一致。

At present, the investigation of soil organic carbon in Hainan Island is mainly concentrated in the forest soil, but shrub communities＇ soil has not attracted enough attention. This study was based on the survey of 72 soil profiles of 24 shrub communities plots in Hainan Island, and then analyzed its concentration and density of soil organic carbon and the carbon storage. The results suggested the distribution characteristics and preliminarily estimated the storage of soil organic carbon in the shrub community of Hainan Island, as well as provided the theoretical basis for important ecological value in the shrub community of Hainan Island, The results showed that the concentration of soil organic carbon in the shrub community of Hainan Island was （6.20±0.61）g/kg, and the average density of soil organic carbon was 5.94 kg/m2. The concentration and average density of soil organic carbon with the soil layer of 10 em thickness in the shrub community of Hainan Island decreased with the increase of soil depth. The storage of soil organic carbon in the shrub soil （100 cm） of Hainan Island was about 1.48×107 t, and the contribution rate of soil surface layer （0-30 cm） and （0-50 cm） were 46.15% and 65.28%, respectively, it is consistent with other types of soil,