西沙群岛主要岛屿不同植被类型对土壤理化性质的影响

Effect of Vegetation Types on Soil Physicochemical Property in East Island and Yongxing Island of Xisha Islands

摘要:

为了解海岛植被恢复过程中植物群落对土壤理化性质的影响，对西沙群岛的永兴岛和东岛上不同植被群落的土壤主要理化性质进行测定。结果表明，随着岛屿植被由藤草经灌木向乔木群落的过渡，土壤含水量由5.9%显著升高至14.2%；土壤微生物生物量碳、生物量氮分别由176.2和41.2 mg kg^-1显著升高至391.5和98.8 mg kg^-1；而pH呈下降趋势。这表明随着植被的恢复，海岛土壤质量不断提高，生态系统渐趋稳定。

Abstract:

In order to understand the effect of vegetation types on soil physicochemical property in Island, the soil physicochemical property in East Island and Yongxing Island of Xisha Islands under three vegetation types were determined. The results showed that in the processes of vegetation types from herbaceous and vines, shrubs to trees community, the soil water content increased significantly from 5.9% to 14.15%, and microbial biomass carbon and nitrogen also increased from 176.2 and 41.2 mg kg^-1 to 391.5 and 98.8 mg kg^-1, respectively. Meanwhile, the soil pH decreased with changes in vegetation types. So, it was suggested that soil quality in Islands enhanced gradually with vegetation recovery, and the island ecosystem became more stable.