Direct measurement and prediction of bulk density on alluvial soils of central Chile
Direct measurement and prediction of bulk density on alluvial soils of central Chile
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DOI：
10.4067/s0718-58392016000100015
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发表时间：
2016-03-01
影响因子：
1.7
通讯作者：
Salazar, Osvaldo
中科院分区：
文献类型：
--
作者：
Casanova, Manuel;Tapia, Elizabeth;Salazar, Osvaldo
研究了土壤容重（rho（B））作为土壤质量的重要指标的意义。通过直接方法（土块，圆柱体，挖掘）与三个样本大小（小，中，大）获得的体积密度值进行了比较，通过10个已发表的土壤传递函数（PTFs）的两个冲积土（大量的细纹理的Fluventic Haploxeroll和聚集，粗纹理的Fluventic Haploxerept）智利中部。除细质地土壤中的小圆柱体外，评估的方法和样本量之间无显著差异。在粗质地土壤上，挖掘和土块方法之间没有显着差异，但中等大小的圆柱体不同于其他大小的圆柱体。一般来说，冷技术往往比其他方法得到更高的值。使用的基本信息（质地和有机质/C含量）从现有的PTFs为两个网站，更好地适合粗质地比细质地的土壤。这表明，有必要确定一套当地校准的PTF，解决整个智利土壤资源的复杂性。
The significance of soil bulk density (rho(b)) as a key indicator of soil quality was examined in this study. Bulk density values obtained by direct methods (clod, cylinder, and excavation) with three sample sizes (small, medium, and large) were compared with those obtained by 10 published pedotransfer functions (PTFs) for two alluvial soils (a massive fine-textured Fluventic Haploxeroll and an aggregated, coarse-textured Fluventic Haploxerept) of central Chile. With the exception of small cylinders in fine-textured soil, there were nonsignificant differences between the methods and sample sizes assessed. On the coarse-textured soil, there were nonsignificant differences between the excavation and clod methods, but medium-sized cylinders differed from other cylinder sizes. In general, the clod technique tended to give higher values than the other methods. Using basic information (texture and organic matter/C content) from the existing PTFs for both sites, a better fit for coarse-textured than fine-textured soils was obtained. This indicates that it is necessary to define a set of locally calibrated PTFs that address the complexity of the soil resource throughout Chile.