【摘要】 为了探讨桉树纯林和桉树-珍贵树种混交林造林前后土壤理化性质的变化趋势。在广西南宁市郊南面的马尾松林采伐迹地上,分别营造桉树纯林(EP)和桉树-珍贵树种混交林(EM)两种人工林模式,进行造林前后土壤(0~60 cm土层)理化性质的比较研究。结果表明:1)EP和EM土壤容重为1.097~1.433 g/cm3;总孔隙度为47.32%~59.64%,其中非毛管孔隙度为7.76%~17.67%;通气度为11.33%~19.62%;饱和、毛管和田间持水量依次为23.58%~42.16%、21.11%~39.76%和9.19%~37.77%。2)土壤p H值为4.28~4.75;有机质为4.12~29.01 g/kg;全N、水解N分别为0.18~0.72 g/kg、27.96~87.61 mg/kg;全P、有效P分别为0.16~0.30 g/kg、0.45~3.29 mg/kg;全K、速效K分别为1.11~2.76 g/kg、0.16~0.29mg/kg。3)3年生桉树纯林和桉树-珍贵树种混交林两种人工林模式,在造林前后的各项土壤理化指标差异微弱,统计分析结果均无显著差异。更多还原

【Abstract】 In order tfo discuss the changed trend of soil physical and chemical properties before and after the afforestation of Eucalyptus gradis pure plantation(EP) and mixed plantation of E. gradis with precious hardwood(EM). Both of two plantation models were afforested in the Pinus massoniana cutting blank in the south of Nanning, Guangxi Autonomous Region, then the soil(0~60 cm)physical and chemical properties before and after the afforestation were studied. The results showed that:(1)There was 1.097~1.433 g/cm3 of soil bulk density of(EP) and(EM) before and after afforestation. There was 47.32%~59.64%of soil total porosity and then 7.76% ~17.67% of non-capillary porosity, 11.33% ~19.62% of venting quality. There was23.58% ~42.16%, 21.11% ~39.76%, 9.19% ~37.77% of saturation moisture capacity, capillary moisture capacity and field moisture capacity, respectively.(2) 4.28~4.75 of soil p H value; 4.12~29.01 g/kg of organic matter; 0.18~0.72 g/kg of total N,27.96 ~87.61 mg/kg of hydrolytic N; 0.16 ~0.30 g/kg of total P, 0.45 ~3.29 mg/kg of available P, 1.11 ~2.76 g/kg of total K,0.16~0.29 mg/kg of available K.(3)There was no significant difference in the physical and chemical properties of soil before and after afforestation between 3 year-old E. gradis pure forests and 3 year-old mixed plantation of E gradis and precious hardwood.更多还原