Bulk Densities of California Soils in Relation to Other Soil Properties

Abstract

Analyses of 721 samples from inorganic horizons of upland and alluvial soils in seven orders were utilized to develop equations for predicting soil bulk density at 1/3‐bar water content. The minimum standard errors of estimate (0.14 g cm−3, r2 = 0.723, for upland soils and 0.11 g cm−3, r2 = 0.672, for alluvial soils) were obtained with functions of organic carbon content, 15‐bar water content, the ratio of 15‐bar water to clay, silt and sand contents, parent material, calcium carbonate equivalent, mean soil horizon depth, and for alluvial soils, soil drainage class too. Functions of electrical conductivity of saturation extract and, for alluvial soils, mean soil horizon depth did not lower the standard errors of estimate (SE) further when added to this list. Organic C content (OC) alone predicts the bulk densities (DB) of upland soils with a SE of 0.19 g cm−3 (r2 = 0.462): DB = 1.66 − 0.308 · OC0.5.

Relações entre propriedades físicas e características de solos da região sul do Brasil

“…Relações similares entre Ds e matéria orgânica e Ds e textura do solo foram demonstradas nos trabalhos desenvolvidos por Alexander (1980), Adams (1983), Rawls (1983), e Bernoux et al (1998). Em solos tropicais, teores elevados de óxidos de ferro e alumínio estão associados à formação de uma estrutura granular…”

Soil Organic Carbon Stocks in Deep Soils at a Watershed Scale on the Chinese Loess Plateau

“…The sampling and measurement of BD is labor intensive, costly, and often impractical, especially at depths below 1 m. Therefore, we used BD values derived from a pedotransfer function (PTF) developed from 1254 measured data sets from the CLP region (Wang et al, 2014b). For soils on the CLP, this PTF outperformed other established PTFs, such as those presented by Alexander (1980), Manrique and Jones (1991), and Balland et al (2008). The PTF model used was …”

Pedotransfer functions to estimate soil bulk density for Northern Africa: Tunisia case

“…Dots correspond to profiles, but their location inside the administrative unit is arbitrary only in a visual purpose. different soils (Adams, 1973;Alexander, 1980;Arrouays and Pélissier, 1994;Benites et al, 2007;Bernoux et al, 1998b;Dupouey et al, 1997;Federer, 1983;Federer et al,1993;Grigal et al,1989;Kaur et al, 2002;Martin et al, 2009;Reinsch and Grossman, 1995). Generally, OC content, measured in g per kg, and with inorganic particle-size expressed as a % of the fine earth (fraction <2 mm), has been the most important variables in PTFs, and followed by clay percent.…”