Water Acquisition From The Seasonal Wetland and Root Development of Pearl Millet Intercropped With Cowpea in A Flooding Ecosystem of Northern Namibia

Zegada‐Lizarazu, Walter; Kanyomeka, Luke; Izumi, Yoshiharu; Iijima, Morio

doi:10.1626/pps.10.20

Cited by 15 publications

(5 citation statements)

References 20 publications

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“…Numerous studies have described water uptake patterns in forests 9 10 11 and grasslands 12 13 14 , but little attention has been focused on croplands. Studies have assessed the main water uptake depths for monocultures 15 16 17 and the competitive interactions among intercropped plants 18 19 20 by directly comparing δ 18 O and δ D in xylem and soil water. Other studies have identified the proportional contributions of water from each soil depth to crops according to the isotopic mixing models 21 22 .…”

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Irrigation depth far exceeds water uptake depth in an oasis cropland in the middle reaches of Heihe River Basin

Yang

Wen

Sun

2015

Sci Rep

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Agricultural irrigation in the middle reaches of the Heihe River Basin consumes approximately 80% of the total river water. Whether the irrigation depth matches the water uptake depth of crops is one of the most important factors affecting the efficiency of irrigation water use. Our results indicated that the influence of plastic film on soil water δ18O was restricted to 0–30 cm soil depth. Based on a Bayesian model (MixSIR), we found that irrigated maize acquired water preferentially from 0–10 cm soil layer, with a median uptake proportion of 87 ± 15%. Additionally, maize utilised a mixture of irrigation and shallow soil water instead of absorbing the irrigation water directly. However, only 24.7 ± 5.5% of irrigation water remained in 0–10 cm soil layer, whereas 29.5 ± 2.8% and 38.4 ± 3.3% of the irrigation water infiltrated into 10–40 cm and 40–80 cm layers. During the 4 irrigation events, approximately 39% of the irrigation and rainwater infiltrated into soil layers below 80 cm. Reducing irrigation amount and developing water-saving irrigation methods will be important strategies for improving the efficiency of irrigation water use in this area.

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Irrigation depth far exceeds water uptake depth in an oasis cropland in the middle reaches of Heihe River Basin

Yang

Wen

Sun

2015

Sci Rep

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“…The comparison of the hydrogen isotope signatures in xylem sap with those in a simulated rainfall event (recently irrigated water) and existing (stored) soil water can be used to reveal the source of water used by the plants. Recently, this technique has been used to reveal the water sources of annual crops species (Zegada-Lizarazu and Araki and Iijima, 2005;Iijima et al, 2005;Zegada-Lizarazu et al, 2006a, b;Zegada-Lizarazu et al, 2007). The water uptake by crops from no-tillage fields has not been fully investigated due to the experimental difficulties of the estimation of water uptake in the field-grown crops.…”

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No-Tillage Enhanced the Dependence on Surface Irrigation Water in Wheat and Soybean

Iijima

Morita

Zegada‐Lizarazu

et al. 2007

Plant Production Science

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No-tillage often affects crop root development due to the higher mechanical impedance to root elongation, resulting in yield reduction under an unfavorable rainfall pattern, such as drought. In this study, we analyzed the changes in water source of wheat and soybean under drought stress in a continuous no-tillage field. Deuterium-labeled irrigation water was applied at different growth stages of crops to analyze their water uptake pattern. Mechanical impedance of the surface soil was 3.5 and 4.4 times higher in the no-tillage than in the conventional tillage under wet and drought conditions, respectively. Root length density and root branching index (the length of lateral roots per unit axile root length) of soybean in the surface soil layer were higher in the no-tillage field. This indicates that the increased branching by the higher mechanical impedance of undisturbed surface soil causes roots to accumulate in the surface soil layer. The deuterium concentration in the xylem sap of both crops was significantly higher in the no-tillage than in the tillage under a drought condition. This indicates that the crops in the no-tillage field depend highly on the newly supplied easily accessible water (irrigation water and/or rainfall) as compared with those in the conventional tillage field under a limited water supply. In conclusion, enhanced surface root growth in the no-tillage condition would result in higher dependence on surface supplied irrigation water than in the conventional tillage under drought.

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“…Deuterated (heavy) water was used as the tracer for plant water uptake (Ijima et al , 2007; Zegada-Lizarazu et al , 2007 ). At 14 d after planting, plants were transferred to the aerated water culture with 99.9 atom% deuterium-labelled water (D 2 O).…”

Section: Methodsmentioning

confidence: 99%

Visualization of lateral water transport pathways in soybean by a time of flight-secondary ion mass spectrometry cryo-system

Iijima

Yoshida

Kato

et al. 2011

Journal of Experimental Botany

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Water movement between cells in a plant body is the basic phenomenon of plant solute transport; however, it has not been well documented due to limitations in observational techniques. This paper reports a visualization technique to observe water movement among plant cells in different tissues using a time of flight-secondary ion mass spectrometry (Tof-SIMS) cryo-system. The specific purpose of this study is to examine the route of water supply from xylem to stem tissues. The maximum resolution of Tof-SIMS imaging was 1.8 μm (defined as the three pixel step length), which allowed detection of water movement at the cellular level. Deuterium-labelled water was found in xylem vessels in the stem 2.5 min after the uptake of labelled water by soybean plants. The water moved from the xylem to the phloem, cambium, and cortex tissues within 30–60 min after water absorption. Deuterium ion counts in the phloem complex were slightly higher than those in the cortex and cambium tissue seen in enlarged images of stem cell tissue during high transpiration. However, deuterium ion counts in the phloem were lower than those in the cambium at night with no evaporative demand. These results indicate that the stem tissues do not receive water directly from the xylem, but rather from the phloem, during high evaporative demand. In contrast, xylem water would be directly supplied to the growing sink during the night without evaporative demand.

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Water Acquisition From The Seasonal Wetland and Root Development of Pearl Millet Intercropped With Cowpea in A Flooding Ecosystem of Northern Namibia

Cited by 15 publications

References 20 publications

Irrigation depth far exceeds water uptake depth in an oasis cropland in the middle reaches of Heihe River Basin

Irrigation depth far exceeds water uptake depth in an oasis cropland in the middle reaches of Heihe River Basin

No-Tillage Enhanced the Dependence on Surface Irrigation Water in Wheat and Soybean

Visualization of lateral water transport pathways in soybean by a time of flight-secondary ion mass spectrometry cryo-system

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