| 营养液pH变化对刺梨苗吸收硝态氮和铵态氮的影响 |
| |
| 引用本文： | 王梦柳,樊卫国,官纪元,龚芳芳,何春丽.营养液pH变化对刺梨苗吸收硝态氮和铵态氮的影响[J].中国农学通报,2021,37(9):28-34. |
| |
| 作者姓名： | 王梦柳 樊卫国 官纪元 龚芳芳 何春丽 |
| |
| 作者单位： | 1.贵州大学,贵阳 550025;2.贵州省六盘水市农业科学研究院,贵州钟山 553000;3.国家林业和草原局刺梨工程技术研究中心,贵阳 550025 |
| |
| 基金项目： | 国家林业和草原局工程技术研究中心平台运行项目(2019133002) |
| |
| 摘 要： | 研究介质pH变化条件下刺梨(Rosa roxburghii)对不同形态氮素吸收特性的影响,能为不同pH土壤上刺梨的合理施肥提供科学依据。本研究以‘贵农5号’刺梨实生苗为材料,采用营养液培养和离子耗竭法,在分别供给硝态氮和铵态氮的条件下,设置营养液分别为pH 4、5、6、7、8、9的6个处理,测定不同pH营养液培养的刺梨苗对NO3-、NH4+的吸收动力学参数和刺梨苗的植株高度、干重生物量、氮含量及氮吸收量,分析营养液pH变化与NO3-、NH4+的吸收动力学参数的相关性和营养液pH变化与刺梨苗植株高度、生物量、氮含量和氮素吸收量的相关性。研究结果表明,刺梨根系对硝态氮、铵态氮及总氮的吸收规律均符合Michaelis-Menten酶动力学方程。营养液的pH变化能够改变刺梨苗根系对NO3-和NH4+的吸收特性。在营养液pH 4~9的范围内和供给硝态氮的条件下,刺梨实生苗的根系对NO3-的最大吸收速率(Imax)、根系与NO3-的亲和力、NO3-流入根系的速率(α)、植株高度、干重生物量、氮含量及氮的吸收量随营养液pH的增大而明显降低,营养液的pH变化与上述指标呈极显著负相关。在供给铵态氮的条件下,刺梨实生苗根系对NH4+的上述指标随营养液pH的升高而明显增大,营养液的pH变化与上述指标呈极显著正相关。在酸性条件下有利于刺梨苗对硝态氮的吸收,升高营养液的pH不利于刺梨苗吸收硝态氮。碱性条件有利于刺梨苗对铵态氮的吸收,酸性条件对刺梨苗吸收铵态氮有不利影响。
|
| 关 键 词： | 刺梨 硝态氮 铵态氮 氮素吸收动力学参数 氮吸收量 |
| 收稿时间： | 2020-07-23 |
Effect of Nutrient Solution pH on Nitrate-N and Ammonium-N Uptake of Rosa roxburghii Seedlings |
| |
| Wang Mengliu,Fan Weiguo,Guan Jiyuan,Gong Fangfang,He Chunli.Effect of Nutrient Solution pH on Nitrate-N and Ammonium-N Uptake of Rosa roxburghii Seedlings[J].Chinese Agricultural Science Bulletin,2021,37(9):28-34. |
| |
| Authors: | Wang Mengliu Fan Weiguo Guan Jiyuan Gong Fangfang He Chunli |
| |
| Institution: | 1.Guizhou University, Guiyang 550025;2.Guizhou Liupanshui Academy of Agricultural Sciences, Zhongshan Guizhou 553000;3.Engineering Technology Research Centre for Cili of National Forestry and Administration, Guiyang 550025 |
| |
| Abstract: | The effects of different nutrient solution pH conditions on the absorption characteristics of different nitrogen forms in Rosa roxburghii were studied, aiming to provide guidance for rational fertilizer in the cultivation of R. roxburghii on soil with different pH conditions. Taking R. roxburghii ‘Guinong 5’ seedlings as materials, using the method of nutrient solution culture and ion depletion, six treatments with nutrient solution pH 4, 5, 6, 7, 8, 9 were set up under the application of nitrate and ammonium nitrogen respectively, the absorption kinetics parameters of NO3 -, NH4+ in R. roxburghii seedlings were determined, and the plant height, dry weight biomass, nitrogen content and nitrogen uptake of the R. roxburghii seedlings were measured, the correlation between nutrient solution pH change and absorption kinetic parameters of NO3 -, NH4 and the correlation between nutrient solution pH change and plant height, dry weight biomass, nitrogen content and nitrogen uptake of R. roxburghii seedlings were analyzed. The results showed that the absorption pattern of nitrate nitrogen, ammonium nitrogen and total nitrogen followed the Michaelis-Menten kinetics equation. The nutrient solution pH change affected the absorption of NO3- and NH4+ in the roots of R. roxburghii. When the nutrient solution pH change increased from 4 to 9 and nitrate nitrogen was applied, the maximum absorption rate (Imax) of the root of NO3 -, the root and NO3- affinities, the rate (α) in the roots of the NO3- flow into the roots, plant height, dry weight biomass, nitrogen content and nitrogen uptake of R. roxburghii seedling decreased with the increase of pH, there was a significant negative correlation between the nutrient solution pH change and the above indexes. The above indexes of R. roxburghii seedling of NH4 + increased with the increase of pH under the condition of ammonium nitrogen application, and there was a significant positive correlation between nutrient solution pH change and the above indexes. Acidic condition is beneficial to the nitrate uptake of R. roxburghii seedlings, while the increase of the pH of the nutrient solution is not beneficial for R. roxburghii seedlings to absorb nitrate. Alkaline condition is beneficial to the ammonium uptake of R. roxburghii seedlings, while acidic condition is unfavorable for R. roxburghii seedlings to absorb ammonium nitrogen. |
| |
| Keywords: | Rosa roxburghii nitrate-N ammonium-N nitrogen absorption kinetic parameters nitrogen uptake |
|
| 点击此处可从《中国农学通报》浏览原始摘要信息 |
| 点击此处可从《中国农学通报》下载免费的PDF全文 |
|
