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对冀北山地黑桦(Betula dahurica)、白桦(Betula platyphylla)、山杨(Populus davidilana)、油松(Pinus tabulaeformis)、蒙古栎(Quercus mongolica)和五角枫(Acer elegantulum)等6种天然林分类型的土壤养分空间分布、变异以及养分之间的相关关系进行了研究。结果表明:1)土壤pH值介于5.04~6.47之间;有机质、速效钾、全氮、碱解氮、全磷的含量均为油松纯林最低,速效磷以蒙古栎纯林最低,养分整体上有随土壤深度增加而减小的趋势。2)表层土壤pH值的变异系数为0.107,其他土层的pH值变异系数均小于0.1,属于弱变异性。土壤养分指标中40~60cm的变异系数最大,其中,速效磷的变异系数最大,为强变异性,其他养分含量各层均为中等变异。3)pH值、有机质、全氮、碱解氮与速效钾有极显著正相关关系,碱解氮、速效磷与全磷具有极显著正相关关系;pH值与有机质、碱解氮有显著相关关系,全磷与有机质、速效钾有显著相关关系;速效磷与有机质、全氮、碱解氮、速效钾之间关系明显。
Six natural forests, Betula dahurica, Betula platyphylla, Populus davidilana, Pinus tabulaeformis, Quercus mongolica and Acer elegantulum, Type of soil nutrients spatial distribution, variation and nutrient correlation were studied. The results showed as follows: 1) The soil pH ranged from 5.04 to 6.47. The contents of organic matter, available potassium, total nitrogen, available nitrogen and total phosphorus were the lowest in the pure stands of Pinus tabulaeformis, Overall, there is a tendency to decrease as soil depth increases. 2) The coefficient of variation of surface soil pH is 0.107, and the coefficient of variation of other soil layers is less than 0.1, which belongs to weak variability. The coefficient of variation of 40-60 cm in soil nutrient index was the largest. Among them, the coefficient of variation of available phosphorus was the highest, and it was strong variability. The other nutrient contents were all medium variations. There was a significant positive correlation between pH value, organic matter, total nitrogen, available nitrogen and available potassium. There was a significant positive correlation between pH value and total phosphorus. There was a significant positive correlation between pH value and organic matter, Relationship, total phosphorus and organic matter, available potassium has a significant correlation; available phosphorus and organic matter, total nitrogen, available nitrogen, available potassium obvious relationship.