【摘要】 对儋州市东成镇的7个不同类型的桉树(Eucalyptussp.)人工林和一个马占相思林(Acaciamangium)林下的土壤含水量、土壤温度、土壤容重、土壤坚实度(硬度)以及土壤的机械组成等5个土壤物理指标进行研究。结果表明,有林下植被的桉树人工林地的土壤含水量比无林下植被的桉树人工林地的高出11.2~62.9 g.kg-1;同一样地内,有枯枝落叶覆盖物的土壤含水量平均比没有枯枝落叶覆盖物的土壤含水量高27.6~38.2 g.kg-1;有林下植被的桉树人工林地土壤温度比无林下植被的桉树人工林地和空旷弃荒地低,但却比无林下植被、树冠大、荫蔽度大的马占相思林地的高。有林下植被的桉树人工林地的土壤硬度要比无林下植被的桉树人工林地、马占相思林地和空旷弃荒地的小5.49~18.76 kg.cm-3。林下植被覆盖率高的桉树人工林地,其容重比有林下植被的桉树人工林地、无林下植被的桉树人工林地、马占相思林地、牧草实验地样地小0.33~0.48 g.cm-3。这说明桉树人工林下植被和枯枝落叶是影响土壤含水量、土壤硬度、土壤温度、土壤容重等土壤物理性质的重要因子。因此,为了有效改善桉树林的立地条件以及能更好地经营桉树人工林,在种植桉树后,确保适度桉树人工林下植被的生长和保留枯枝落叶覆盖物来改善土壤物理性质是很重要的。更多还原

【Abstract】 The study on the soil water content,temperature,bulk density,hardness,and mechanical components under 7 artificial Eucalyptus forests and 1 Acacia forest in Dongcheng Town of Danzhou City showed that soil water content in the Eucalyptus forest with 50% coverage of understory vegetation was 11.2～62.9 g·kg^-3 higher than that without understory vegetation,and 27.6～38.2 g·kg^-3 higher in the forest with litter coverage than without it.Soil temperature under the Acacia forest with understory vegetation was higher than that with no understory vegetation or with high coverage of forest canopy,but lower than that in open area.Soil hardness under the Eucalyptus and Acacia forests with understory vegetation was 5.49～18.76(kg·cm^-3 lower) than that without understory vegetation,and soil bulk density under the Eucalyptus forests with high coverage of understory vegetation was 0.33～0.48 g·cm^-3 lower than that with low coverage of understory vegetation or without it,under Acacia forest,and at the plot with 30% of herbage coverage.The results indicated that understory vegetation,litter,and forest canopy were the important factors affecting the soil physical properties under Eucalyptus and Acacia forests,and thus,it was very important to remain some understory vegetations and litters of these forests for improving soil physical characteristics and developing Eucalyptus and Acacia forests.更多还原