| 摘要: |
| 【目的】探讨油松人工林不同林分密度下的土壤特性及水源涵养功能。【方法】以秦岭西段30年生油松人工林为研究对象,设置6种不同林分密度(1 367，1 861，2 517，2 617，3 012和3 683株/hm2)的标准地，采集土样和枯落物样品带回室内，测定土壤理化性质、土壤持水量、枯落物层持水特性等。【结果】林分密度对油松人工林的土壤含水率、有机质含量、体积质量、总孔隙度、土壤最大持水量、毛管持水量具有显著影响。密度为2 617 株/hm 2的林地土壤体积质量较小(1.14 g/cm3)，总孔隙度较大(62.57%)，有机质含量较高，为1 367 株/hm2林地的1.63倍，土壤持水性能较好(1 251.40 t/hm2)。【结论】油松人工林在适宜密度条件下，有利于改善土壤结构，增强土壤肥力，提高土壤的蓄水能力，使林地具有更好的水源涵养功能。在秦岭西段小陇山林区，油松人工林的林分密度为2 617 株/hm2左右较合理。 |
| 关键词: 油松人工林 林分密度 土壤有机质 土壤体积质量 孔隙度 持水量 |
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| 基金项目:林业公益性行业科研专项（20100400206）；国家自然科学基金项目（31070570） |
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| Soil properties and water conservation function of Pinus tabulaeformis plantation with different stand densities |
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| Abstract: |
| 【Objective】This paper was to discuss the soil properties and water conservation function of Pinus tabulaeformis plantation with different densities.【Method】30 year-old P.tabulaeformis plantation with six different stand densities(1 367,1 861,2 517,2 617,3 012 and 3 683 plant/hm2) in western Qinling mountains were taken as the research object.The soil and litter samples were collected to measure soil physical and chemical properties,soil water-holding capacity,and litter water-holding characteristics.【Result】Stand density had significant influence on the soil water content,organic matter content,bulk density,total porosity,soil maximal water-holding capacity and capillary water-holding capacity.P.tabulaeformis plantation with stand density of 2 617 plant/hm2 had low soil bulk density (1.14 g/cm3),large total porosity (62.57%),high organic matter content which was 1.63 times to that of plantation with density of 1 367 plant/hm2,and good soil water-holding capacity (1 251.40 t/hm2).【Conclusion】P.tabulaeformis plantation with proper density was beneficial to improve soil structure,fertility and water-holding capacity and had better water conservation function.2 617 planthm2 was a reasonable stand density for P.tabulaeformis plantation in western Qinling mountains. |
| Key words: Pinus tabulaeformis plantation stand density organic matter bulk density porosity water-holding capacity |
