山杜英人工林土壤有机碳和营养元素的垂直分布格局

Vertical Distribution of Soil Organic Carbon and Nutrient Element Storages of An Elaeocarpus sylvestris Plantation

土壤养分能为植物和土壤微生物的生存提供环境支撑和物质基础在植物生长和生理代谢方面发挥重要的作用以韶关市小坑林场山杜英(Elaeocarpus sylvestris)人工林为研究对象通过测定不同土壤深度的碳、氮、磷和钾的质量分数探讨不同土壤深度的养分质量分数和储量的垂直分布规律在林地内建立3个面积为20 m×20 m的样地每个样地按梅花形挖5个土壤剖面均按0<h≤20cm、20cm<h≤40cm、40cm<h≤60cm、60cm<h≤80 cm、80 cm<h≤100 cm分层由下至上采集土壤将每个样地5个土壤剖面同一土层混合成1个土壤样品带回实验室分析结果表明:①山杜英人工林土壤有机碳、氮、磷、钾的碳质量分数均随着土壤深度的增加呈现减少的趋势其中土壤有机碳和氮质量分数有明显的表层富集现象②山杜英人工林土壤有机碳、氮、磷和钾储量分别为136.37、12.81、6.75和302.82thm-2其中土壤有机碳和氮储量与土壤有机碳和氮质量分数的变化特征一致均随土壤深度的增加而减少但磷和钾储量随土层深度的增加而呈缓慢增加趋势。

Soil carbon,nitrogen,phosphorus and potassium of an Elaeocarpus sylvestris plantation were studied in Xiaoken Forest Farm,Shaoguan City for forest soil nutrient management.Three plots with an area of 20 m×20 m were established in the plantation,and five soil profiles with a depth of 100 cm for each plot were selected.Soils were collected in layers of 0-20,20-40,40-60,60-80 and 80-100 cm,and the same layer of 5 soil profiles was mixed into one soil sample and brought back to the laboratory for analysis.Contents of soil organic carbon and nutrient in the E.sylvestris plantation decreased generally with the increase of soil depth,and soil organic carbon and nitrogen contents were rich in the soil surface layer.The soil organic carbon,nitrogen,phosphorus and potassium storages were 136.37,12.81,6.75 and 302.82 t·hm-2,respectively.The distribution patterns of organic carbon and nitrogen storages were similar to those of organic carbon and nitrogen contents,while the phosphorus and potassium storages slightly increased with increase of soil depth.