西双版纳橡胶林土壤有机碳分布特征研究

摘要

Focused on soil organic carbon ( SOC) content in rubber plantations with different stand age , the soil or-ganic carbon distribution at temporal and spatial scales had been analyzed in Mengla , Xishuangbanna .It was shown that SOC content of 10, 20, 30 a rubber plantation was 9.51-10.88, 7.36-7.88, 8.78-9.31 g.kg -1, respec-tively, and organic carbon storage decreased as 10 a>30 a>20 a.SOC content gradually decreased with the in-creasing depth of soil layers , and there was no significant difference in SOC content in 0-45 cm soil layer of 20 a, 30 a rubber plantation .SOC content in the same soil layer differed significantly among rubber plantations with differ-ent stand age.But, the majority of SOC concentrated in 0-30 cm soil layer, especially in 0-15 cm soil layer.SOC storage in the surveyed rubber plantations were 47.50-66.41 t· hm-2 , and exhibited similar trend in different soil layers and different stand age plantations as SOC content .Compared with rubber plantations in Danzhou , Hainan Province, the SOC storage in rubber plantations in Xishuangbanna was larger , while, the variation of SOC in depth was less in Xishuangbanna .%针对西双版纳勐腊县境内不同林龄橡胶林的土壤有机碳含量，分析其在时间和空间尺度上的分布情况。结果表明：10、20、30 a橡胶林土壤有机碳含量分别为9.51～10.88、7.36～7.88、8.78～9.31 g．kg－1，各林龄有机碳储量10 a＞30 a＞20 a。橡胶林土壤有机碳含量均随土壤深度的增加而降低，10 a龄橡胶林在0—45 cm土层中的土壤有机碳含量随深度变化差异显著，其他2个林龄橡胶林土壤有机碳含量在各土层间差异不显著。不同林龄橡胶林土壤有机碳含量在同一土层中差异显著，但均主要分布于0—30 cm土层中，特别是0—15 cm土层。不同林龄土壤有机碳总储量为47.50～66.41 t· hm－2，其在不同土层间以及不同林龄间的变化趋势与土壤有机碳含量变化趋势相近。将西双版纳与海南儋州橡胶林土壤有机碳分布特征进行对比，前者各个林龄橡胶林土壤有机碳总量均大于后者，但后者橡胶林土壤有机碳随深度增加的变异趋势比前者更明显。