Root System Responses to Soil Structural Properties: Micro- and Macro-Scale

Tardieu, Francois F.

doi:10.1007/978-94-009-2421-5_13

Cited by 6 publications

(8 citation statements)

References 50 publications

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“…It should also be pointed out that local soil conditions (like strength in a soil layer) may affect the suitability of a particular soil region for root colonization. But the actual presence of roots in that zone will also depend on whole plant factors, like general water status or nutrition (Tardieu, 1989) and the time‐course of stress development. The conditions in adjacent soil regions will also play a role.…”

Section: Discussionmentioning

confidence: 99%

“…The conditions in adjacent soil regions will also play a role. Tardieu (1988a)(1989) reported that a soil region where soil strength is not limiting per se, may have low root density because of local compaction directly above ( shadow effect ). In our experiment, root density was greater in the peds of the clay‐loam treatment compared with peds in the other treatments.…”

Section: Discussionmentioning

confidence: 99%

“…But the actual presence of roots in that zone will also depend on pected (C, S ϩ LA), little if any green leaf area was left after severe wilting. This indicates that water availability whole plant factors, like general water status or nutrition (Tardieu, 1989) and the time-course of stress develop-was a limiting factor, despite the average water content of the tubes corresponding with values of water poten-ment. The conditions in adjacent soil regions will also play a role.…”

Section: Discussionmentioning

confidence: 99%

“…The conditions in adjacent soil regions will also play a role. Tardieu (1988aTardieu ( , 1989 reported that a soil tial above those to which plants dried the soil in uniform soil (S treatment).…”

Section: Discussionmentioning

confidence: 99%

See 3 more Smart Citations

Spatial Distribution of Roots and Water Uptake of Maize (Zea mays L.) as Affected by Soil Structure

Amato

Ritchie

2002

Crop Science

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The incomplete soil exploration by roots is a possible cause of reduced water uptake and the occurrence of strong gradients in water potential between root clusters and the bulk soil. Therefore, the hydraulic or root signal‐elicited behaviors of plants might correspond to a lower water content than that of the bulk soil. Evidence supporting this hypothesis is scarce and often circumstantial due to the lack of appropriate techniques. This work studies the relations of root clustering caused by localized soil compaction and the spatial patterns of water uptake in plants grown on stored water. Five soil structure treatments were compared in 100‐cm high containers: clay‐loam soil (C), sandy‐clay soil (S), sandy clay with large clay‐loam peds (S + LA), sandy clay with small clay‐loam peds (S + SA), and compacted clay‐loam soil (CC). Root length density (RLD) and volumetric water content (θv) (time‐domain reflectometry) were measured in bulk soil and across peds in 2‐cm increments. In the S treatment, plant growth was rapid initially, but green leaf area declined to zero when water was exhausted. Root length density was quite uniform in each layer. In the CC treatment, root density and water uptake were limited and leaf area remained stable throughout the experiment, suggesting that incomplete water extraction was a consequence rather than a cause of reduced plant growth. In the other treatments, when plants had lost all leaves, the water content of peds ranged from 0.23 cm3 cm−3 in the outer 2 cm, where roots were present, to more than 0.30 cm3 cm−3 in the center, scarcely penetrated by roots. Thus, there was incomplete water extraction in the C and S + LA, and to a lesser extent in S + SA treatments. This study shows that large gradients in soil water content occur in cases of root clustering caused by localized soil compaction. These gradients are associated with a reduction in water uptake.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Spatial Distribution of Roots and Water Uptake of Maize (Zea mays L.) as Affected by Soil Structure

Amato

Ritchie

2002

Crop Science

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“…These low values of stomatal conductance shown even at mid-morning can also be related to soil characteristics, as certain compaction occurred according to the bulk density observed (Dallas and Lewandowski, 2003). Plants growing in relatively compacted soils usually show low stomatal conductance even when soil water availability is high, as water uptake is less efficient (Tardieu 1989;Tardieu and Simonneau, 1998). In our study, leaf water potential daily dynamics may also be reflecting this fact, since its values dropped abruptly between predawn and midmorning, showing that water uptake did not balance water losses through transpiration even when evaporative demand was lower.…”

Section: Resultsmentioning

confidence: 52%

Effect of irrigation frequency and water distribution pattern on leaf gas exchange of cv. ‘Syrah’ grown on a clay soil at two levels of water availability

Sebastian

Lissarrague

Santesteban

et al. 2016

Agricultural Water Management

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The effects of the rainy season and irrigation on soil water and oxygen in a seasonal forest in Panama

1995

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The effects of irrigation and the rainy season on soil gases, water and physical properties were studied in a lowland moist forest in Panama. Two control plots experienced a normal four-month dry season and two experimental plots were irrigated during the dry season.The forest soils were well aerated. The average soil oxygen content at 20 cm never dropped below 15%. Irrigation in the dry season resulted in treatment effects on soil oxygen and water that persisted throughout the rainy season. The late rainy season soil oxygen content at 20 cm was 18.2% in the control plots and 16.8% in the irrigated plots. The late rainy season soil water content at 0–10 cm was 0.34 m3 m-3 in the control plots and 0.36–0.37 m3 m-3 in the irrigated plots. In the control plots, in the absence of any experimental manipulation, the soil physical properties changed within a single rainy season. Specifically, soil oxygen dropped and soil water increased during the eight-month rainy season.The observed alterations in soil physical properties probably resulted from changes in soil structure and the abundance of large pores. The rainy season or irrigation may decrease soil porosity by dispersing aggregates of soil particles, whereas soil desiccation during the dry season may enhance the formation of aggregates and large pores. As a result, the irrigated soils held more water and were less permeable to gas and water than soils experiencing a normal dry season. We conclude that the dry season may play an important role in maintaining soil structure.

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Root System Responses to Soil Structural Properties: Micro- and Macro-Scale

Cited by 6 publications

References 50 publications

Spatial Distribution of Roots and Water Uptake of Maize (Zea mays L.) as Affected by Soil Structure

Spatial Distribution of Roots and Water Uptake of Maize (Zea mays L.) as Affected by Soil Structure

Effect of irrigation frequency and water distribution pattern on leaf gas exchange of cv. ‘Syrah’ grown on a clay soil at two levels of water availability

The effects of the rainy season and irrigation on soil water and oxygen in a seasonal forest in Panama

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