| Cite this article: | 裴艳武,黄来明,贾小旭,等.不同土质条件下土壤水分对长柄扁桃生理特性的影响[J].灌溉排水学报,0,():-. |
| Pei Yanwu,Huang Laiming,Jia Xiaoxu,et al.不同土质条件下土壤水分对长柄扁桃生理特性的影响[J].灌溉排水学报,0,():-. |
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| Effects of Soil Water Conditions on Physiological Characteristics of Amygdalus Pedunculata Pall under Different Textureal Soils |
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Pei Yanwu1,2, Huang Laiming3, Jia Xiaoxu3, Shao Ming''an3, Zhang Yinglong4
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1.College of Natural Resources and Environment, Northwest A &2.F University;3.Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences;4.Shenmu Ecological Association
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| Abstract: |
| Abstract: 【Background】Amygdalus pedunculata Pall is a deciduous shrub of the genus Amygdalus in the family Rosaceae, which is widely used for desertification control in the arid and semi-arid regions of Northwest China. However, the response of Amygdalus pedunculata Pall to water stress in different soil textures is not conclusive.【Objective】This study aims to explore the response of Amygdalus pedunculata Pall to water stress in different textural soils to provide a basis for the rational allocation of Amygdalus pedunculata Pall in the arid and semi-arid regions of Northwest China. 【Method】A soil column experiment was conducted by using the typical sandy and loamy soils combined with five water treatments (90 ± 5% FC (i.e., field capacity), 75 ±5% FC, 60 ± 5% FC, 45 ± 5% FC, 30 ± 5% FC). Each treatment had four replicates, giving a total of 40 columns (2 soil types × 5 water contents × 4 replicates). Soil samples were air-dried and sieved (<2 mm) to remove stones and roots before filling into the column. Vermiculite was added to the surface of the soil to limit evaporation and the bottom of each soil column sealed to prevent water losses. A tube (2 mm in diameter) inserted from the surface to somewhere mid-way through the soil column was used for irrigating the soil to prevent crusting of the column soils. Amygdalus pedunculata Pall seedlings of similar heights and stem diameters were transplanted into the columns and fixed to the third strains in each column. The experiment was carried out in the growing season of Amygdalus pedunculata Pall, lasting from April 2018 through September 2018. The dynamics of the net photosynthetic rate (Pn), stomatal conductance (Gs), leaf water potential (Ψw) and water consumption by transpiration (W-Tr) of Amygdalus pedunculata Pall under different water treatments in the sandy and loamy soils were measured 3 to 4 times every month. 【Result】The results showed that Pn, Gs and W-Tr in soils with different textures increased initially and then decreased with the reduced of soil water content, while the Ψw showed a downward trend during the whole growing season. Under the same water condition, the Pn, Gs, Ψw and W-Tr of Amygdalus pedunculata Pall during different growth periods showed significant differences between the sandy and loamy soils. However, this discrepancy was not consistent under different water conditions. The Pn, Gs, W-Tr of Amygdalus pedunculata Pall were all higher in loamy soils than in sandy soils under relatively high water treatments (> 60% FC) during growing season, while these parameters (Pn, Gs, W-Tr) were higher in sandy soils than those in loamy soils under lower water treatments (< 60% FC).【Conclusion】Amygdalus pedunculata Pall responded differentially to water stress when grown in different textural soils and it is more adaptable in sandy soils than in loamy soils under increasing intensity of water stress. This can guide revegetation programs on the Loess Plateau where there is a high degree of heterogeneity in soil and water conditions. |
| Key words: Amygdalus pedunculata Pall; Soil texture; Water stress; Photosynthetic characteristics; Water consumption. |
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