陕北风沙区不同植被类型土壤养分特征与肥力评价

Soil nutrient characteristics and fertility evaluation of different vegetation types in aeolian sand region of northern Shaanxi

选取红石峡沙地植物园的4种典型植被类型(樟子松、紫穗槐、柠条和草地)为研究对象,测定了土壤pH、有机质含量、碱解氮含量、速效磷含量、速效钾含量等指标,并运用单因素方差分析法和土壤肥力综合评价法对其进行分析.结果表明:4种植被类型土壤肥力均处于中低级水平,各样地间土壤肥力综合值无显著差异;除pH外,其他土壤养分指标具明显的垂直分布特性.

Four typical vegetation types(Pinus sylvestris var.mongolica Litv,Amorpha fruticosa Linn,Caragana korshinskii Kom and grassland)in Hongshixia Botanical Garden were investigated regarding soil pH,and organic matter,alkali hydrolyzed nitrogen,available phosphorus,available potassium.Single factor variance analysis and comprehensive evaluation method of soil fertility were used to analyze these indicators.The results showed that soil fertility of the 4 vegetation types was at low and middle level,and soil fertility comprehensive values did not vary significantly among different sites.Except for pH,other soil nutrient indicators showed obvious vertical distribution characteristics.