Measuring water retention in undisturbed samples of stony soils

Pereira, Caroline Andrade; Mulazzani, Rodrigo Pivoto; Lier, Quirijn de Jong van; Pedron, Fabrício de Araújo; Gubiani, Paulo Ivonir

doi:10.1590/1678-992x-2022-0145

Cited by 1 publication

(5 citation statements)

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“…One of the most important results from this study is the distinct and complex contribution of CFs on soil porosity and water retention. The effect of CFs properties like their size and internal porosity on the shape of soil water retention curve of the same soils evaluated in this study can be seen in a previous paper (Pereira et al, 2023). Here we focus on water retention at some specific suctions of great interest to evaluate soil porosity and plant available water.…”

Section: Discussionsupporting

confidence: 62%

“…The description of methodology in this study is based on the description presented by Pereira et al (2023). Their proposed techniques for measuring water retention in undisturbed blocks of soils with CFs may be unknown to many researchers and readers.…”

Section: Methodsmentioning

confidence: 99%

“…The soils sampled in this study are those described in Pereira et al (2023). They are located in southern Brazil and contain CFs with an apparent diameter between 2 and 250 mm (Figure 1).…”

Section: Methodsmentioning

confidence: 99%

“…This is one of the factors that makes the technique not so feasible for soils with CFs. Recently, Pereira et al (2023) proposed a technique that consists of coating soil blocks with paraffin wax and using a fine‐grained mineral paste sandwiched between the surface of suction sources and sampled blocks to provide a good hydraulic continuity between them. This technique proved suitable to determine the volumetric water content in soil blocks with CFs from saturation up to 10 m of water suction.…”

Section: Introductionmentioning

confidence: 99%

“…Using the strategy developed by Pereira et al (2023), the present study was performed with two objectives: (i) to characterize the bulk water retention capacity of soils with CFs from three different parent materials, and (ii) to get insights into the effect of porous‐ and non‐porous CFs on water retention to explain multilinear regressions of soil bulk water retention capacity as a function of particle sizes class and soil bulk density.…”

Section: Introductionmentioning

confidence: 99%

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Particle arrangement and internal porosity of coarse fragments affect water retention in stony soils

Pereira

Mulazzani

Lier

et al. 2023

European J Soil Science

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Information about water retention in stony soils lags behind due to methodological difficulties. We applied a new strategy to measure the water retention in soils with coarse fragments (CFs) and to get insights into the effect of CFs porosity on water retention. Water retention at zero, 10, and 150 m suction, bulk density, and the mass fraction of six particle size classes were measured in undisturbed blocks from soils with variable CFs contents, originating from three parent materials. The results showed that some soils contain porous CFs (2-250 mm) with a water holding capacity as high as the fine fraction (<2 mm). The water held in the suction range of 1-150 m in a soil with porous CFs was twice as high as in soils with non-porous CFs. Multilinear regressions revealed that both the water retention capacity at 1 m suction and in the range 1-150 m were more dependent on bulk density than on the fraction of CFs and fine particles. In the soil with porous CFs, there was no correlation between their fraction and soil water retention. These results show that the bulk water retention capacity of soils with CFs is underestimated when not considering the internal porosity of the CFs. A better understanding of the effect of the porosity of CFs on bulk soil porosity and water retention is important to propose suitable pedotransfer functions and refine physically-based hydraulic functions for stony soils.

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Section: Discussionsupporting

confidence: 62%

Section: Methodsmentioning

confidence: 99%

“…The soils sampled in this study are those described in Pereira et al (2023). They are located in southern Brazil and contain CFs with an apparent diameter between 2 and 250 mm (Figure 1).…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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