【摘要】 [目的]土壤养分含量及其空间分布状况是陆地生态系统健康与可持续发展的重要评价因素，因此分析土壤养分及其空间特征对该区域的土壤养分管理以及土地可持续利用意义重大。[方法]在半干旱的宁南山区选取不同土地利用类型为研究对象，采用地统计学空间插值分析了土壤养分含量及其空间分布特征。[结果]黄土丘陵不同土地利用类型土壤全量养分均处于中等偏下的水平，表层0—20 cm土壤养分含量均高于20—40 cm土层，“表聚效应”明显。整体上，土壤养分含量基本表现为天然草地>柠条>山杏>裸地>梯田>退耕草地，其中天然草地显著高于其他植被类型(p<0.05)。从土壤养分的空间分布可知，土壤有机碳含量呈中部低、南北高的状态；土壤速效磷含量呈中部高，南北低的状态；土壤硝态氮和铵态氮含量变化趋势则是从南到北逐渐递增。[结论]人工种植柠条和山杏有利于改善该地区土壤综合质量水平；因此，退耕还林(草)的生态恢复措施能够持续、有效改善当地的土壤质量状况。更多还原

【Abstract】 [Objective] Soil nutrients and their spatial distribution are important ecological factors to ensure ecosystem health. The aim of this study is to analyze the soil nutrients and their spatial characteristics, which is of great significance for soil nutrient management and land sustainable use in this region. [Methods] In this study, different land use types were selected in the semi-arid loess hilly area, and soil nutrients were measured, and analyzed by the geostatistical method. [Results] The results showed that the total soil nutrients of different land uses in the loess hill were at the lower than medium level, and the nutrient content of different land use types in 0—20 cm soil layer was higher than that in 20—40 cm soil layer, showing surface aggregation effect. On the whole, the soil nutrient content showed the order of natural grassland>Caragana Korshinskii>apricot>bare land>terrace>grassland, and the soil nutrient content of the natural grassland was significantly higher than that other vegetation types(p<0.05). From the spatial distribution of soil nutrients, it can be seen that soil organic carbon content is low in the middle and high in the north and south. Soil available P content was high in the middle and low in the north and south. Soil nitrate nitrogen and ammonium nitrogen contents increased gradually from south to north. [Conclusion] The artificial planting of Caragana Korshinskii and apricot was beneficial to improve the comprehensive level of soil quality in this area. Therefore, land conservation measures such as returning farmland to forest(grass) can continuously improve local soil quality.更多还原