Long Term Conventional Tillage Effect on Spatial Variability of Some Soil Physical Properties
Long Term Conventional Tillage Effect on Spatial Variability of Some Soil Physical Properties
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DOI：
10.1080/10440040802395056
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发表时间：
2009-02
影响因子：
--
通讯作者：
E. Özgöz
中科院分区：
文献类型：
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作者：
E. Özgöz
土壤紧实度在许多方面影响作物产量。了解其空间变异性为针对具体地点的土壤处理提供了可能性，可以提高作物生产的盈利能力和可持续性。本研究的目的是（1）调查的粒度分布，重量含水量，容重，和渗透阻力的空间变异性使用经典的和地统计学方法在一个领域中，在传统的土壤耕作方法和特定的作物轮作，（2）评估的空间关系，在研究领域的土壤性质。在一个45公顷的面积上，根据不规则网格设计，在94个预定取样点分别对表土（0至20 cm）和底土（20至40 cm）进行取样。容重表现出最低的变异性（CV = 9.09%的表土和6.00%的底土），渗透阻力表现出最高的变异性（CV = 64.08%和42.69%，表土和底土，分别）。重量含水量和体积密度表现出很高的相关性，特别是与粘土和砂含量，而没有显着的相关性之间发生的渗透阻力和任何质地成分。空间相关范围从72到510米不等。表层土壤粘粒含量具有较强的空间相关性，而下层土壤粘粒含量只有中等的空间相关性。评价的其他土壤性质的空间依赖类没有随深度而变化。强的空间依赖性发生的贯入阻力和砂含量，和一个中等的空间依赖性发生的体积密度，重量含水量，和泥沙含量。体积密度，贯入阻力和纹理成分的克里格图的比较显示，更大的贯入阻力和体积密度与更大的砂含量。然而，大多数研究区的土壤具有粘土质地。因此，农民在使用土壤耕作和其他可能导致压实的管理方法时需要小心。
Soil compaction affects crop yield in many ways. Knowing its spatial variability provides possibilities for site-specific soil treatments that can increase the profitability and sustainability of crop production. The purposes of this study were (1) to investigate the spatial variability of particle size distribution, gravimetric water content, bulk density, and penetration resistance using classical and geostatistical methods in a field in which conventional soil tillage methods and a particular crop rotation were applied, and (2) to evaluate the spatial relations among soil properties in the field studied. Topsoil (0 to 20 cm) and subsoil (20 to 40 cm) were separately sampled at each of 94 predetermined sampling points based on an irregular grid design in a 45 ha areaypic Ustifluvents). Bulk density showed the lowest variability (CV = 9.09% for topsoil and 6.00% for subsoil), and the penetration resistance showed the highest variability among the soil properties investigated (CV = 64.08% and 42.69%, for topsoil and subsoil, respectively). Gravimetric water content and bulk density showed high correlation particularly with clay and sand content, whereas no significant correlation occurred between penetration resistance and any of the textural components. Spatial correlation ranges varied from 72 to 510 m. Clay content had strong spatial dependence in topsoil, whereas, only moderate spatial dependence occurred in subsoil. Spatial dependence classes of other soil properties evaluated did not change with depth. Strong spatial dependence occurred for penetration resistance and sand content, and a moderate spatial dependence occurred for bulk density, gravimetric water content, and silt content. Comparisons of kriged maps of bulk density, penetration resistance, and textural components revealed that greater penetration resistance and bulk density were associated with greater sand content. However, most of the soils of study area had a clayey texture. Therefore, farmers need to be careful in application of soil tillage and other management practices that could cause compaction.