西昌市耕地土壤有效钼空间变异特征及影响因素分析  

Analysis on Spatial Variability and Affecting Factors of Available Molybdenum in Cultivated Soil of Xichang City

作　　者：张毅[1] 王昌全[1] 薛国祥[2] 蔡艳[1] 

机构地区：[1]四川农业大学资源环境学院,四川雅安625014 [2]四川省西昌市农业局土肥站,四川西昌615000

出　　处：《湖北农业科学》2012年第13期2701-2705,2744,共6页Hubei Agricultural Sciences

基　　金：农业部;财政部测土施肥补贴资金项目

摘　　要：采用GIS和地统计相结合的方法,对西昌市耕地土壤耕层有效钼含量的空间分布特征及影响因素进行分析。结果表明:该区域内耕层土壤有效钼含量为(0.27±0.15)mg/kg,其空间分布呈带状,土壤有效钼含量变异函数曲线的理论模型能较好地符合指数模型;块金值与基台值之比为6.1%,具有强烈的空间相关性,表明受母质、地形、土壤类型等结构性因素影响较大;不同海拔高度对土壤有效钼含量的影响存在显著差异;不同地貌类型中土壤有效钼含量为平原>丘陵>山地,平原与山地之间土壤有效钼含量存在显著差异,但平原与丘陵、丘陵与山地之间无显著差异;成土母质也是影响土壤有效钼空间分布的主要因素。The spatial distribution characteristics of available molybdenum content in topsoil soil sampled from Xichang city were analyzed using Geostatisitics and GIS methods, as well as factors affecting available molybdenum content. The results showed that the content of available molybdenum in the studied region was （0.27±0.15）mg/kg; and spatial distribution of available molybdenum was beh-shaped. The theoretical mode of variogram curve of available molybdenum fitted the exponen- tial model. The ratio of nugget and sill was 6.1% which had a strong spatial correlation. It showed that available molybdenum was strongly influenced by the structural factors such as parent material, topography, soil type and so on. The content of available molybdenum had significant difference between different altitudes. The order of available molybdenum content was plain〉 hills〉 mountain; and there was significant different between plain and mountain. Soil parent material was one of the main factors influencing the spatial distribution patterns of available molybdenum.

关 键 词：空间变异 耕地 有效钼 西昌 

分 类 号：S151[农业科学—土壤学]