摘要
为探究氮素形态对高山杜鹃侧枝生长的影响,以3年生盆栽高山杜鹃粉精灵为试验材料,单一氮源处理为对照,采用盆栽方式,研究5种不同氮素形态配比供应(铵硝比例分别为T1:100∶0,T2:75∶25,T3:50∶50,T4:25∶75和T5:0∶100)对其营养生长期侧枝生长、光合特性、代谢酶活性及营养元素积累的影响。结果表明,不同氮素形态下粉精灵不同生长期侧枝干物质积累量、苗高增量和侧枝长度均有所差异,以侧芽萌发期T3处理侧枝干物质积累量最高,T2处理在嫩侧枝期、侧枝半木质化期的苗高增量和侧枝长度均显著高于其他处理。侧枝半木质化期,与T1处理相比,T2处理显著提高净光合速率、蒸腾速率、气孔导度、水分利用率及磷含量,降低胞间二氧化碳浓度;叶片Fe元素吸收量以T1处理最高,Mg元素吸收量以T5处理最高。此外,在不同生长期,硝酸还原酶活性均随硝态氮含量的增加而增加,以嫩侧枝期酶活性最高。综上,不同氮素形态对高山杜鹃粉精灵侧枝生长和生理特性的影响有所差异,且混合氮源处理较单一氮源处理更有利于促进侧枝生长,以铵硝比例75∶25促进侧枝生长及提高养分积累和光合效能效果最好。本研究为筛选适合高山杜鹃生长发育的氮素施用方法提供了理论依据。
To study the effect of nitrogen form on the growth of side branches of alpine Rhododendron,3-year potted alpine Rhododendron Fen Jing-ling powder fairy was used as experimental material.A single nitrogen source treatment was used as the control,and the effects of 5 different nitrogen form ratios(ammonium and nitrate ratio:T1:100∶0,T2:75∶25,T3:50∶50,T4:25∶75 and T5:0∶100,respectively)on collateral growth,photosynthetic characteristics,metabolic enzyme activity and nutrient accumulation in vegetative growth period were studied in pot.The results showed that there were differences between different nitrogen ratios on the dry matter accumulation of lateral branches,seedling height increment,and lateral branch length of Fen Jing-ling at different growth stages,among which the T3 treatment had the highest dry matter accumulation of lateral branches at the stage of lateral bud germination and the T2 treatment had significantly higher seedling height increment and lateral branch length than the other treatments at the stage of shoot lateral branches and semi-lignification of lateral branches.During the semi-lignification stage of lateral branches,compared with T1 treatment,T2 treatment significantly increased net photosynthetic rate,transpiration rate,stomatal conductance,water use efficiency,and phosphorus content while reducing intercellular carbon dioxide concentration.The absorption of Fe element in leaves was the highest in T1 treatment,and the absorption of Mg element was the highest in T5 treatment.In addition,nitrate reductase activity increased with the increase in nitrate nitrogen ratio at different growth stages,with the highest enzyme activity occurring during the tender branch stage.In summary,the effects of different nitrogen ratios on the growth and physiological characteristics of the side branches of the Rhododendron Fen Jing-ling vary.The mixed nitrogen source treatment promoted the growth of the side branches compared to a single nitrogen source treatment,with an ammonium-nitrogen ratio of 75∶25 being more conducive to the growth of the side branches,improving nutrient accumulation and photosynthetic efficiency.This study provides a theoretical basis for optimizing nitrogen fertilizing strategies and nitrogen application methods suitable for the growth and development of alpine rhododendrons,thereby improving the cultivation and management level of seedling quality.
作者
高研
彭绿春
李世峰
解玮佳
宋杰
张露
熊俊芬
赵正雄
GAO Yan;PENG Lüchun;LI Shifeng;XIE Weijia;SONG Jie;ZHANG Lu;XIONG Junfen;ZHAO Zhengxiong(School of Resources and Environment,Yunnan Agricultural University,Kunming,Yunnan 650201;Flower Research Institute,Yunnan Academy of Agricultural Sciences/National Engineering Research Center for Ornamental Horticulture/Yunnan Flower Breeding Key Laboratory/Yunnan Flower Research and Development Center,Kunming,Yunnan 650205)
出处
《核农学报》
CAS
CSCD
北大核心
2024年第4期785-793,共9页
Journal of Nuclear Agricultural Sciences
基金
云南省重大科技专项(202302AE09018)。
关键词
高山杜鹃
氮素形态
侧枝生长
生理特性
营养元素
Rhododendron hybrids
nitrogen form
lateral branch growth
physiological characteristics
nutritional elements
