海拔高度对山核桃林地土壤pH值和有效养分的影响

在山核桃产区湍口镇开展了对山核桃林地土壤pH值和有效养分状况随海拔高度的动态监测。结果表明,在海拔220～330 m的范围内,随着海拔升高,土壤pH值呈明显的上升趋势,变幅为5.05～6.32。土壤速效氮、速效磷、速效钾和有机质则在海拔220～310 m表现出一定程度的下降,它们的变幅分别为土壤速效氮201.25～274.75 mg/kg、速效磷18.60～121.41 mg/kg、速效钾99.63～207.50 mg/kg、有机质26.87～42.77 g/kg;而在海拔330 m的山顶,它们的含量均维持在较高水平。研究结果表明,山核桃林地土壤pH值和有效养分随海拔升高分别表现出明显的垂直分布特征。此外,它们的变异还受到土壤条件、施肥水平以及地形、气候等因素的影响。

Effects of Altitude on pH Value and Available Nutrients in Chinese Hickory Orchards

A dynamic mornitoring was conducted to examine soil pH value and nutrient availability changing with altitude in different Chinese hickory orchards of Tuankou town.Results showed that within the attitude 220～330 m of the increasing height,soil pH value increased obviously with the range of 5.05～6.32.Soil available nutrients of nitrogen(N),phosphorus(P),potassium(K) and organic matter(OM) decreased within 220～310 m with the ranges of 201.25～274.75 mg/kg,18.60～121.41 mg/kg,99.63～207.50 mg/kg and 26.87～42.77 g/kg,respectively.However,at the top of the hill(330 m),the contents of N,P,K and OM soil all maintained a relative higher level.The results indicated pH value and available nutrients perform a vertical distribution with the attitude.In addition,their variations were affected by soil conditions,application rate,topography and climate factors,etc.