| 引用本文: | 李 双,高 阳,司转运,等.氮量与株间竞争对番茄幼苗根系形态、生物量积累及氮素利用的影响[J].灌溉排水学报,2018,37(5):13-18. |
| LI Shuang,GAO Yang,SI Zhuanyun,et al.氮量与株间竞争对番茄幼苗根系形态、生物量积累及氮素利用的影响[J].灌溉排水学报,2018,37(5):13-18. |
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| 摘要: |
| 【目的】阐明不同氮素供应和株间竞争对番茄幼苗根系形态、叶片光合特性、地上部生物量积累及氮素吸收利用的影响。【方法】在步入式人工气候室内，以盆栽番茄幼苗为研究对象，营养液的氮质量浓度设置为高氮(15 mmol/L，N15)和低氮(1 mmol/L，N1)2个水平，株间竞争设置为每桶种植4株(P4)和单株种植(P1)2个水平，所有处理均充分供水。【结果】随幼苗生长，N15P1处理的幼苗根系形态、Pn和Gs显著优于其他处理，且相同氮质量浓度下4株种植幼苗的Pn小于单株种植。番茄幼苗的单株叶面积随施氮量的增加而增加，在相同氮素供应条件下，株间竞争的存在显著降低幼苗个体的光合面积，进而影响干物质积累。土壤硝态氮量和叶片全氮量均随施氮量的增加而增加，竞争群体叶片氮吸收量呈增加趋势。【结论】营养液中氮质量浓度为15 mmol/L，单株种植的幼苗个体长势最佳；营养液中氮质量浓度为15.0 mmol/L，竞争群体番茄幼苗的氮吸收量最高。 |
| 关键词: 株间竞争； 根系形态； 光合特性； 生物量积累； 氮素利用 |
| DOI：10.13522/j.cnki.ggps.2017.0020 |
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| Impact of N Application and Intra-competition of Tomato Seedlings on Their Root Morphology, Biomass Accumulation and N Use Efficiency |
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LI Shuang, GAO Yang, SI Zhuanyun, Tefo Steve Ramatshaba, DUAN Aiwang
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Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences/ Key Laboratory of Crop Water Requirement and Regulation, Ministry of Agriculture, Xinxiang 453002, China
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| Abstract: |
| 【Objective】 Competition of plants for resources could impact their development and resources acquisition. In this paper, we investigated the impact of nitrogen application and intra-competition of tomato seedlings on their root morphology, photosynthetic traits, above-ground biomass accumulation and nitrogen use efficiency. 【Method】 Pot experiments were conducted in a walk-in greenhouses with sufficient water supply. Two nitrogen treatments were examined: sufficient nitrogen application (N15) with nitrogen concentration in the nutrition solution at 15 mmol/L, and insufficient nitrogen application (N1) with nitrogen concentration in the nutrition solution at 1 mmol/L. The intra-competition was created by growing four plants in one pot (P4); the control was growing a single plant in one pot (P1). 【Result】①With the seedlings growing, Pn, Gs and root morphology in N15-P1 treatment were superior to those in other treatments, and at the same nitrogen application, intra-competition reduced Pn. ②Leaf area per plant increased with nitrogen application, while at the same nitrogen application, intra-competition reduced the leaf area per plant, giving rise to a decrease in above-ground biomass accumulation. ③Increasing nitrogen application led to a rise in soil nitrate and total nitrogen in leaves; intra-competition increased nitrogen in leaves compared with those without competition. 【Conclusion】 When the nitrogen concentration in the nutrient solution was at 1 mmol/L, the seedling without competition grew well, whereas when the nitrogen concentration was at 15 mmol/L, the seedlings competing for resources took up more nitrogen due to the relief in nitrogen stress. |
| Key words: intra-competition; root morphology; photosynthetic characteristics; biomass accumulation; nitrogen utilization |
