Water percolation through the root-soil interface

Benard, Pascal; Kroener, Eva; Vontobel, Peter; Kaestner, Anders; Carminati, Andrea

doi:10.1016/j.advwatres.2015.09.014

Cited by 50 publications

(46 citation statements)

References 39 publications

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“…Moderate water stress did not stop the roots from absorbing water, and the RWU recovered after rewetting. This observation was agreement with the findings of other researchers (Ahmed et al., ; Benard, Kroener, Vontobel, Kaestner, & Carminati, ). Even if the water deficit was severe and some plants withered, most plants recovered within a few hours or days (Kramer, ).…”

Section: Discussionsupporting

confidence: 94%

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Modelling root water uptake under deficit irrigation and rewetting in Northwest China

et al. 2020

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The spatial and temporal distribution of root water uptake (RWU) under deficit irrigation are critical factors for crop growth. The SWAP (soil–water–atmosphere–plant) model was applied to analyze the pattern of RWU for winter wheat (Triticum aestivum L.) under three irrigation levels: no water deficit (100% evapotranspiration [ET]), moderate water deficit (80% ET) and severe water deficit (60% ET). The 2–yr experiments indicated that SWAP was highly accurate (mean relative error [MRE] <21.7%, root mean square error [RMSE] <0.07 cm3 cm−3) in simulating the soil water content (SWC). Root water uptake was significantly (P < 0.01) different in the 0‐ to 60‐cm soil layer. The 0‐ to 60‐cm soil layer was the main source of RWU, and the average value accounted for 89.4% of the total root zone. Water stress had the greatest adverse effect on heading to grain filling, reducing RWU by 0.0026 cm3 cm−3 d−1. The critical SWC was 67.9% of the field capacity, when the RWU dropped to 95% of the control treatment. After rewetting, compensation and hysteresis effects on RWU were observed. The ranking of RWU recovery ability after rewetting was: emergence to jointing > jointing to heading > grain filling to maturity > heading to grain filling. Recovery time of RWU was 2 to 11 d and gradually increased with growth stage. The simplified RWU model established using path analysis and regression performed well (R2 = 0.836; P < 0.01) for RWU. This provided a more convenient way to accurately estimate RWU with fewer variables.

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Section: Discussionsupporting

confidence: 94%

“…() and Benard et al. () found that this dynamic behavior of the rhizosphere was the effect of mucilage. The mucilage is a gelatinous material secreted by the root tips and is capable of absorbing large amounts of water under dry conditions (McCully & Boyer, ).…”

Section: Discussionmentioning

confidence: 97%

Modelling root water uptake under deficit irrigation and rewetting in Northwest China

et al. 2020

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“…In particular, they found that mucilage contains phospholipid surfactants that lower the surface tension (minimum value of 48 mN.m -1 for filtered and concentrated mucilage) compared with that of pure water (72 mN.m -1 ). Other studies have shown that after drying, mucilage becomes hydrophobic and limits the rewetting of the root-soil interface [105]. In any cases, mucilage modifies the wetting properties of the root-soil interface compared with the bulk soil.…”

Section: D) How Maximizing the Thrust Efficiency?mentioning

confidence: 99%

Physical root–soil interactions

2017

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Abstract. Plant root system development is highly modulated by the physical properties of the soil and especially by its mechanical resistance to penetration. The interplay between the mechanical stresses exerted by the soil and root growth is of particular interest for many communities, in agronomy and soil science as well as in biomechanics and plant morphogenesis. In contrast to aerial organs, roots apices must exert a growth pressure to penetrate strong soils and reorient their growth trajectory to cope with obstacles like stones or hardpans or to follow the tortuous paths of the soil porosity. In this review, we present the main macroscopic investigations of soil-root physical interactions in the field and combine them with simple mechanistic modeling derived from model experiments at the scale of the individual root apex.2

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“…The combination of increased SWR and slow rewetting rate of mucilage results in reduced water content within the rhizosphere for days after rewetting [ Moradi et al ., ]. The reduced moisture content during rewetting events serves to shield roots from extreme shifts in osmotic pressure [ Benard et al ., ], while the increased moisture retention during dry conditions promotes plant resiliency. As mucilage ages within soil, hydrophobicity becomes increasingly permanent, which can lead to SWR independent of moisture content [ Carminati , ].…”

Section: Introductionmentioning

confidence: 99%

Pore‐scale water dynamics during drying and the impacts of structure and surface wettability

Cruz

Furrer

Guo

et al. 2017

Water Resources Research

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Plants and microbes secrete mucilage into soil during dry conditions, which can alter soil structure and increase contact angle. Structured soils exhibit a broad pore size distribution with many small and many large pores, and strong capillary forces in narrow pores can retain moisture in soil aggregates. Meanwhile, contact angle determines the water repellency of soils, which can result in suppressed evaporation rates. Although they are often studied independently, both structure and contact angle influence water movement, distribution, and retention in soils. Here drying experiments were conducted using soil micromodels patterned to emulate different aggregation states of a sandy loam soil. Micromodels were treated to exhibit contact angles representative of those in bulk soil (8.4° ± 1.9°) and the rhizosphere (65° ± 9.2°). Drying was simulated using a lattice Boltzmann single‐component, multiphase model. In our experiments, micromodels with higher contact angle surfaces took 4 times longer to completely dry versus micromodels with lower contact angle surfaces. Microstructure influenced drying rate as a function of saturation and controlled the spatial distribution of moisture within micromodels. Lattice Boltzmann simulations accurately predicted pore‐scale moisture retention patterns within micromodels with different structures and contact angles.

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Water percolation through the root-soil interface

Cited by 50 publications

References 39 publications

Modelling root water uptake under deficit irrigation and rewetting in Northwest China

Modelling root water uptake under deficit irrigation and rewetting in Northwest China

Physical root–soil interactions

Pore‐scale water dynamics during drying and the impacts of structure and surface wettability

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