中文摘要：

以栽植小叶锦鸡儿25年的固定沙丘为研究对象,从3个坡位（迎风坡、顶坡、背风坡）分别进行了4个深度（0~5cm、5~10cm、10~20cm、20~40cm）的取样,开展了固定沙丘土壤交换性盐基空间分布特征研究。结果表明：交换性盐基含量的分布受坡位影响较大（P〈0.01）;各交换性盐基含量表现为：表层（0~5cm）含量最高,随着深度的增加均呈降低趋势;灌丛对交换性Na、Ca、Mg的富集效果显著,对交换性K的富集效果不显著。相关性分析表明,土壤电导率与交换性K、Na、Ca、Mg有显著的相关性,各交换性盐基间相关性显著。

英文摘要：

To study spatial distribution of soil exchangeable base in Horqin Sandy Land, soil samples were collected in different depths （0 - 5 cm, 5 - 10 cm, 10 - 20 cm and 20 - 40 cm） on windward slope, top slope and leeward slope of stable sand dune after the establishment of Caragana microphylla for 25 years. The results showed that the distribution of the contents of exchangeable K, Na, Ca, Mg were affected by slope positions significantly （P 0.01）. The contents of exchangeable base in depth of 0 - 5 cm were the highest among different depths, and decreased with soil layers. Enrichment effect from canopy shrub was significant for exchangeable Na, Ca and Mg, but no significant effect for exchangeable K. There was significant correlation between EC and exchangeable K, Na, Ca and Mg. Correlations among exchangeable K, Na, Ca and Mg were also significant.