中文摘要：

调查了川中丘陵区小流域典型农林复合生态系统土壤养分的时空分异，同时研究了不同土地利用方式下土壤养分含量的变化。结果表明：2002年与1999年相比，耕地土壤有机质含量，全量养分都有相应的增加，速效养分有一定程度的降低。土壤养分含量剖面分异明显，随深度的增加大多数呈明显的下降趋势。但全钾的变化比较特殊，不同深度土壤全钾含量没有明显的变化。不同台位林地的土壤养分含量存在明显的差异，林地土壤有机质、氮素含量随高度的增加而增加，但磷、钾含量却有随高度的增加而降低的趋势。不同土地利用方式之间土壤有机质、全氮、全钾含量差异显著。土壤有机质含量在几种土地利用方式之间的比较是：水田〉林地〉旱坡地〉草地，土壤全氮含量水田〉林地〉旱坡地〉草地，全钾含量水田〉草地〉林地〉旱坡地。

英文摘要：

Space-time distribution of soil nutrient content in different land use types was investigated in the agro-forestry of central hilly of Sichuan, China. Results indicated that, the content of soil organic matter and total nutrient of cropland increased from 1999 to 2002. But, the content of available nutrient decreased. The content of soil increased following the increasing of depthof soil except total potassium. The diversity of soil nutrient content in different height woodland was significant. Soil organic matter and nitrogen content of woodland increased with the increasing of depth. But potassium and phosphorus decreased with the increasing of depth. Significant differences among land use were found for soil organic matter, total nitrogen and total potassium. The trend of soil organic matter content changing was that： paddy field 〉 woodland 〉 dry farmland 〉 pasture. The trend of total soil nitrogen content was that： paddy field 〉 woodland 〉 dry farmland 〉 pasture. The trend of total soil potassium content was that： paddy field 〉 pasture 〉 woodland 〉 dry farmland.