引用本文: | 依里帆·艾克拜尔江, 李 进, 庄伟伟.两种豆科植物及各器官对不同形态氮的吸收、分配研究[J].广西植物,2023,43(12):2256-2268.[点击复制] |
Erfan AKBERJAN, LI Jin, ZHUANG Weiwei.Absorption and distribution of different forms of nitrogen in two legumes and organs[J].Guihaia,2023,43(12):2256-2268.[点击复制] |
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两种豆科植物及各器官对不同形态氮的吸收、分配研究 |
依里帆·艾克拜尔江1,2, 李 进1, 庄伟伟1*
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1. 新疆师范大学 生命科学学院, 新疆特殊环境特种多样性应用与调控重点实验室, 乌鲁木齐 830054;2. 新疆西天山国家级自然保护区管理局, 新疆 伊宁 835000
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摘要: |
豆科植物在氮素缺乏的荒漠生态系统中大量存在,是该生态系统提供有效氮的中心,也是这一区域重要的先锋物种。该文选择古尔班通古特沙漠广泛分布的弯花黄芪(Astragalus flexus)和镰荚黄芪(Astragalus arpilobus)作为研究对象,分别在0~5、5~15 cm土层添加3种不同形态氮(15N-NH4+、15N-NO3-、15N-glycine),研究两种植物及各器官对不同形态氮素的吸收、分配策略。结果表明:(1)在不同土层中,两种植物均偏好吸收硝态氮,并且弯花黄芪、镰荚黄芪对硝态氮的最高吸收速率均为3.26、2.59 μg·g-1 · h-1。(2)在不同土层中,植物各器官间均对不同氮源吸收及分配有显著性差异(P < 0.05),弯花黄芪根的15N吸收量均大于镰荚黄芪的,3种不同形态氮主要分配于叶。(3)在不同土层中,不同氮源对两种植物的贡献率均为15N-NO3-> 15N-glycine > 15N-NH4+,硝态氮对弯花黄芪氮素吸收的贡献率在37%~41%之间,而对镰荚黄芪氮素吸收的贡献率最高可达45%。(4)植物各器官间均对不同形态氮的回收率存在显著性差异(P < 0.05); 在0~5 cm土层中,植物各器官对硝态氮的回收率均为叶>茎>根,而在5~15 cm土层中,弯花黄芪表现为叶>根>茎。总体上,在古尔班通古特沙漠生态系统中,不同生活型豆科植物对氮素吸收及分配能力既有一致性也有差异性,并且受到不同土壤深度、氮形态的影响。该研究结果为新疆干旱、半干旱区豆科植物的氮吸收利用及分配提供了理论依据。 |
关键词: 豆科植物, 植物器官, 15N同位素标记, 氮素吸收, 古尔班通古特沙漠 |
DOI:10.11931/guihaia.gxzw202210002 |
分类号:Q945 |
文章编号:1000-3142(2023)12-2256-13 |
基金项目:新疆维吾尔自治区自然科学基金面上项目(2021D01A123); 新疆维吾尔自治区重点实验室开放课题(2021D04003); 国家自然科学基金(42007092); 新疆特殊环境物种多样性应用与调控重点实验室开放课题(XJTSWZ-2022-02)。 |
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Absorption and distribution of different forms of nitrogen in two legumes and organs |
Erfan AKBERJAN1,2, LI Jin1, ZHUANG Weiwei1*
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1. Key Laboratory of Special Environment Biodiversity Application and Regulation in College of Life Science, Xinjiang Normal University,
Urumqi 830054, China;2. Xinjiang Administration of West Tianshan National Nature Reserve, Yining 835000, Xinjiang, China
1. Key Laboratory of Special Environment Biodiversity Application and Regulation in College of Life Science, Xinjiang Normal University,
Urumqi 830054, China; 2. Xinjiang Administration of West Tianshan National Nature Reserve, Yining 835000, Xinjiang, China
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Abstract: |
Legumes are abundant in the nitrogen deficient desert ecosystems, which is the center of supplying available nitrogen and the important pioneer species in this region. However, the studies on nitrogen uptake and utilization by legumes in desert ecosystems have rarely been reported so far. In this study Astragalus flexus and A. arpilobus, which are widely distributed in the Gurbantunggut Desert, were selected as the research objects. Three different nitrogen forms(15N-NH4+, 15N-NO3-, 15N-glycine)were added to 0-5 cm and 5-15 cm soil layers, respectively, to study the absorption and distribution strategies of different forms of nitrogen in two plants and their organs. The results were as follows:(1)In different soil layers, both plants preferred to absorb nitrate nitrogen, and the maximum absorption rates of A. flexus and A. arpilobus were 3.26, 2.59 μg·g-1· h-1, respectively.(2)In different soil layers, there were significant differences in the uptake and allocation of different nitrogen sources among plant organs(P < 0.05). The uptake of 15N in root of A. flexus was higher than that of A. arpilobus, and the three different nitrogen forms were mainly allocated to leaves.(3)In different soil layers, the contribution rates of different nitrogen sources to both plants were 15N-NO3- > 15N-glycine > 15N-NH4+, and the contribution rates of nitrate nitrogen to nitrogen absorption of A. flexus ranged from 37% to 41%, while the maximum contribution rate to the nitrogen absorption of A. arpilobus was 45%.(4)There were significant differences in recovery rates of different nitrogen forms between different organs of plants(P<0.05). In the 0-5 cm soil layer, the recovery rate of nitrate nitrogen was leaf > stem > root, while in the 5-15 cm soil layer, the rate was leaf > root > stem. In general, in the Gurbantunggut Desert ecosystem, different life forms legumes had both consistency and difference in nitrogen uptake and allocation capacity, and were affected by different soil depths and nitrogen forms. The results provide theoretical basis for nitrogen uptake, utilization and allocation of legumes in arid and semi-arid regions of Xinjiang. |
Key words: legumes, plant organ, isotopic labeling, nitrogen uptake, Gurbantunggut Desert |
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