海南西部不同林龄橡胶人工林生态系统土壤有机碳库及其影响因素分析

Study on Soil Organic Carbon and Its Impact Factors in Rubber Plantation Ecosystem at Different Stand Ages in the Western Region of Hainan

该研究通过对海南西部不同林龄橡胶人工林土壤剖面进行有机碳含量实测,估算土壤有机碳储量,结果表明4种不同林龄橡胶人工林生态系统土壤有机碳含量为6.20～14.36 g/kg;橡胶人工林土壤有机碳碳含量随土壤层的增深而逐渐减少,除33 a胶林0～60cm各层土壤有机碳含量差异显著外,其他同一林龄橡胶人工林不同土壤层间差异不显著,不同林龄橡胶人工林在同一土壤层间有机碳含量差异显著,土壤有机碳集中于0～30 cm土壤层;5、10、19和33 a橡胶人工林生态系统土壤有机碳储量分别为76.85、74.48、81.74和85.31 t/hm2。气候条件、土壤质地、凋落物量累积与分解、林龄大小和胶林经营管理是影响橡胶人工林土壤有机碳蓄积的主导因子。

The organic carbon content in the soil profiles of different forest age-class rubber plantations was measured,and the soil organic carbon storage was estimated.The results showed that the content of soil organic carbon（SOC） ranged from 6.20 to 14.36 g/kg for rubber plantation ecosystem at stand age of 5 a,10a,19a and 33a.The soil organic carbon content gradually decreased with the increasing depth of soil layers,and there was little difference in the soil carbon content in each layer of 0-60 cm of different stand ages except that of 33a.The carbon content at the same soil layer differed significantly of the rubber plantations with different stand ages,most of organic carbon concentrated in 0-30 cm soil.The carbon stock of soil organic carbon in 5a,10a,19 a and 33a rubber plantation were 76.85,74.48,81.74 and 85.31 t/hm2 respectively.The soil texture,litter content accumulation and decomposition,forest age size and rubber forest management may be the main factors influencing the soil organic carbon accumulation of rubber plantation.