中文摘要：

土壤中元素含量的分布特征反映了多个成土因素综合作用下土壤演变过程的结果。研究在黄土高原区关中平原西部地区采集两个典型的土垫旱耕人为土剖面，研究常量元素K、Na、Ca、Mg、P、Fe、A1、Ti的分布特征及其成因。结果表明，土垫旱耕人为土剖面中，K、Fe、Al、n呈中高型分布，ca、P、Na、Mg呈中低型分布。各元素的迁移能力表现为：ca最强，P、Na、Mg、K次之，Fe、A1、n比较稳定。Ca、P、Na、Mg在剖面上的中低型分布主要是由自然环境下元素自身的淋溶迁移引起；稳定元素Fe、A1、Ti和弱迁移元素K在黏化B层（2Bt．层、2Bt：层）和干润淋溶土表层（2A层）的峰值则主要是由于暖湿气候条件下碳酸盐的强烈淋溶而呈现的相对富集。研究表明，关中地区典型土垫旱耕人为土元素地球化学特征的形成主要受控于气候的变化，人为作用的影响主要体现在有机碳和磷等养分元素在表层的富集上。

英文摘要：

Distribution characteristics of elements in soil reflect the result of pedogenic process under the integrated impact of a number of natural and anthropogenic factors. Two typical profiles of Earth-cumuli-Orthic Anthrosols were collected on the third terrace of the Weihe River in the central-west Loess Plateau for analysis of distribution characteristics of main elements, including K, Na, Ca, Mg, P, Fe, A1 and Ti. Results showed that Ca has the strongest migrating capacity, followed by P, Na, Mg, K, while Fe, Al, Ti are relatively steady. K, Fe, Al, Ti were relatively enriched in the buried paleo-surface horizon （2A） and paleo-argillic horizon （2B,）, where natural pedogenic eluviation and illuviation played a main role. While, Ca, Na, Mg and P showed lower contents in above horizons, especially Ca, due to their relatively high mobility under natural environment. The eluviation of carbonate under warm and humid condition resulted in the relative enrichment of K, Fe, AI and Ti in the buried paleo-surface horizon （2A） and paleo-argillic horizon（2Bt）. Effect of human activities on the contents of main elements in Earth-cumuli-Orthic Anthrosols was mainly reflected only in the enrichment of nutrient elements such as C and P in buried plow horizon and modern plow horizon.