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海南蚂蟥岭流域土壤动物生态地理类群的调查,共获得土壤动物样本2036只,隶属3门7纲18个类目,说明蚂蟥岭流域土壤动物生态地理类群并不丰富。比较流域内5种不同土地利用方式中的土壤动物生态地理类群时发现:桉树人工林地对应尚未开发的原生灌木丛地,其土壤动物生态地理类群的Jaccard相似性系数仅为0.375;土壤动物类群与个体数量分别减少了53.33%与62.74%;土壤动物群落复杂性指数(Cj)下降了1.056;土壤动物群落密度-类群指数(DG)降低了4.620。研究结果还进一步表明:桉树人工林土壤动物多样性的减少,损伤了土壤生态系统中土壤动物分解者的生态功能,造成了桉树人工林种植地枯枝落叶滞留、物质循环功能受阻、肥力下降,流域内土壤生态系统日趋恶化。
A total of 2036 soil animal samples were collected from the Lekaling Watershed, Hainan Province, belonging to 3 classes, 7 classes and 18 categories, indicating that the soil animal eco-geography in the Leyingling watershed is not rich. Comparing the ecotypes of soil fauna among five different land use patterns in the basin found that the eucalyptus plantations correspond to untapped native shrublands and the Jaccard similarity coefficient of soil animal ecogeographic groups is only 0.375. The number of individuals decreased by 53.33% and 62.74% respectively; the complexity index of soil fauna decreased by 1.056; the density of soil fauna and community index (DG) decreased by 4.620. The results also further indicate that the reduction of soil animal diversity in Eucalyptus plantations damages the ecological function of soil animal decomposers in soil ecosystem, causes the retention of litter in Eucalyptus plantation planting land, hinders the material circulation function, decreases fertility, The soil ecosystem in the basin is deteriorating day by day.