| 摘要: |
| 【目的】探究不同供磷水平对青椒幼苗光合特性及矿质元素吸收的影响，为青椒栽培的精准施肥、高效生产提供理论依据。【方法】以‘奥黛丽 红缨枪’青椒幼苗为试材，采用水培法，设置T1(50% P)、T2(75% P)、T3(100% P，对照)、T4(125% P）4个处理，测定不同供磷水平下青椒幼苗的生物量、根系活力、光合色素含量、光合特性及矿质元素含量、积累量，研究各处理对青椒幼苗生长特性的影响，采用主成分分析法分析不同处理的综合表现。【结果】与T3处理相比，T1处理青椒幼苗的地下部鲜质量、地下部干质量、根系活力，叶绿素a、类胡萝卜素、叶绿素a+b含量及净光合速率（Pn）、蒸腾速率（Tr）和气孔导度（Gs）分别显著降低了35.03%，33.33%，54.32%，38.65%，61.83%，22.01%，50.48%，36.50%和40.16%，胞间二氧化碳浓度（Ci）显著升高了18.43%；T2处理地上部鲜质量、地上部干质量、根系活力、叶绿素b含量及Tr和Gs分别显著增加了51.76%，54.02%，14.76%，40.49%，62.02%和124.76%；T4处理地下部鲜质量、地下部干质量、根系活力、叶绿素a含量和Pn分别显著降低了26.60%，32.00%，17.87%，9.81%和28.83%。与T3处理相比，T2处理青椒幼苗Fe、Zn、Ca、K、Mg和N的积累量分别显著上升了62.67%，44.56%，42.33%，24.00%，33.97%和41.41%，Mn和P的积累量分别显著下降了20.85%和34.99%。主成分分析结果表明，各处理青椒幼苗综合表现为T2＞T3＞T4＞T1。【结论】施75%磷肥（T2）对青椒幼苗生长发育、光合作用和矿质元素吸收的促进效果较好。 |
| 关键词: 供磷水平 青椒幼苗 光合性能 矿质元素吸收 |
| DOI： |
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| 基金项目:山西省重点研发计划项目（201903D221065，201903D211011）；山西省现代农业产业技术体系建设专项资金项目（2023CYJSTX08-04） |
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| Effects of different phosphorus supply levels on growth,photosynthetic characteristics and mineral element absorption of green pepper seedlings |
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XU Mengzhu,QIN Zhixiang,ZHANG Fan,et al
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| Abstract: |
| 【Objective】This study investigated the effects of different phosphorus supply levels on photosynthetic characteristics and mineral element absorption of green pepper seedlings to provide basis for further improving precise fertilization and high quality production of green pepper.【Method】The experiment was carried out by hydroponic method with green pepper seedlings of Audrey Red Silk spear.Four treatments of T1(50% P),T2(75% P),T3(100% P),T4(125% P) were included and biomass,root activity,photosynthetic pigment content,photosynthetic characteristics,mineral element content and accumulation of green pepper seedlings were measured.Then,the effects on growth characteristics of green pepper seedlings were analyzed and the comprehensive performance was evaluated using principal component analysis.【Result】Compared to T3,fresh quality of root,dry quality of root,root activity,chlorophyll a,carotenoid,chlorophyll a+b,net photosynthetic rate (Pn),transpiration rate (Tr) and stomatal conductance (Gs) of grafted green pepper seedlings in T1 treatment were significantly decreased by 35.03%,33.33%,54.32%,38.65%,61.83%,22.01%,50.48%,36.50% and 40.16%,while intercellular CO2 concentration (Ci) was increased significantly by 18.43%.In T2 treatment,fresh quality of shoot,dry quality of shoot,root activity,chlorophyll b,Tr and Gs were significantly increased by 51.76%,54.02%,14.76%,40.49%,62.02%and 124.76%,respectively.In T4 treatment,fresh quality of root,dry quality of root,root activity,chlorophyll a and Pn were significantly decreased by 26.60%,32.00%,17.87%,9.81% and 28.83%,respectively.Compared with T3,the accumulation of Fe,Zn,Ca,K,Mg and N in T2 was increased significantly by 62.67%,44.56%,42.33%,24.00%,33.97% and 41.41%,while that of Mn and P was decreased significantly by 20.85% and 34.99%,respectively.The principal component analysis showed that the comprehensive performance of green pepper seedlings was in the order of T2>T3>T4> T1.【Conclusion】The application of 75% phosphorus fertilizer (T2) had good effects on growth,photosynthesis and mineral element absorption of green pepper seedlings. |
| Key words: phosphorus supply level green pepper grafting seedlings photosynthetic absorption of mineral elements |
