中文摘要：

磷是植物生长的限制性营养因子，以江西省武功山山地草甸为研究对象，分析不同海拔高度（1600～1900 m）和不同土壤深度（0～20 cm和20～40 cm）条件下，土壤全磷、有效磷、活性酸度（ pH值）、水解性总酸度及交换性酸度的空间分布特征，以及土壤酸度与土壤有效磷的相关性。结果表明：（1）武功山山地草甸土壤有效磷和全磷含量随海拔升高而显著增加，有效磷与全磷的变异范围分别为：3．71～17．78 mg/kg及0．46～1．37 g/kg；土壤有效磷与全磷含量呈显著相关性；（2）土壤pH值随海拔升高无显著性变化，土壤交换性酸度和水解性总酸度均随海拔升高而显著增加；（3）土壤有效磷含量与土壤交换性酸度及水解性总酸度显著正相关。研究揭示了武功山山地草甸土壤磷素和土壤酸度的空间分布格局及其相关性，同时也为武功山山地草甸生态系统的植被恢复提供理论依据。

英文摘要：

Phosphorus is one of the essential elements for plant growth .Sites were set according to differ-ent altitudes （ the altitude range from 1 600-1 900 m） and different soil depths in the mountain meadow of Wugong Mountain in Jiangxi Province ,and the spatial distribution of soil total P content and the available P content,and the correlation between soil P and soil acidity were analyzed .The main research results were as follows：（ 1） The cotents of soil available P and total P showed a law of vertical distribution .With the elevation increasing gradually ,the total P content and available P content increased gradually ,the ranges of variation in soil total P and available P were 3.71-17.78 mg/kg and 0.46-1.37 g/kg respectively.The available P content had spatial correlation with the total P content .（ 2） There was no significant difference in pH along the altitudes and soil depths .The soil total hydrolytic acidity and soil exchangeable acidity increased significantly with the increase of altitude.（3）There was a significant positive correlation between soil available P and soil total hy-drolytic acidity and soil exchangeable acidity .This study revealed the spatial distribution of soil P and the cor-relation between available P and soil acidity ,providing a guidance for vegetation restoration in mountain mead-ow ecosystem .