| 引用本文: | 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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| 摘要: |
| 摘 要：长柄扁桃是蔷薇科(Rosaceae)扁桃属(Amygdalus)的落叶灌木，被广泛应用于西北旱区荒漠化防治。【目的】本研究旨在探讨不同土质条件下长柄扁桃对水分胁迫的响应特征，为西北旱区因地制宜进行长柄扁桃人工林建设提供参考。【方法】以黄土高原北部典型壤土和砂土为供试土壤，设置5种水分处理（分别为90 ± 5% FC（FC为田间持水率），75±5% FC，60±5% FC ，45±5% FC和30±5% FC），研究了不同质地土壤和水分条件下长柄扁桃生长季内净光合速率（Pn）、气孔导度（Gs）、叶片水势（Ψw）及蒸腾耗水量（W-Tr）的动态变化规律。【结果】随着土壤含水率的降低，不同质地土壤中长柄扁桃生长季内Pn、Gs和W-Tr均呈现先上升后下降的趋势，而Ψw呈现下降趋势。同一水分处理下长柄扁桃不同时期Pn、Gs、Ψw及W-Tr在不同质地土壤间均表现出显著差异，但这种差异在不同水分条件下表现不同。高水分处理下（> 60% FC）长柄扁桃生长季内Pn、 Gs、W-Tr均表现为壤土高于砂土，而低水分处理下（< 60% FC）Pn、 Gs、W-Tr表现为砂土高于壤土。【结论】长柄扁桃在不同质地土壤中对水分胁迫的响应不同，随着水分胁迫的加剧，长柄扁桃更适宜在砂土中生长。 |
| 关键词: 长柄扁桃;土壤质地;水分胁迫;光合特征;耗水规律 |
| DOI： |
| 分类号:S728.2 |
| 基金项目:国家自然科学基金青年基金项目 (41601221)，国家重点研发计划重点专项课题 (2016YFC051605)，中国科学院青年创新促进会会员项目(2019052)，中国科学院地理科学与资源研究所秉维优秀青年人才项目 (2017RC203) 和中国科学院水利部水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室项目 (A314021402-2010) 资助 |
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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. |
