Late-Season Fluxes of Ammonium and Nitrate in Roots of Two Poplar Clones Pretreated with Nutrient Addition

文献类型： 外文期刊

第一作者： Zhao, Yan

作者： Zhao, Yan;Wang, Hui;Li, Jiyue;Dong, Wenyi;Wei, Hongxu;Zhao, Yan;He, Chunxia

作者机构：

关键词： Non-invasive micro-test technique;Ion-selective microelectrodes;Populus spp. hybrid;Nutrient storage;Nitrogen

期刊名称：INTERNATIONAL JOURNAL OF AGRICULTURE AND BIOLOGY （ 影响因子：0.822； 五年影响因子：0.906 ）

ISSN： 1560-8530

年卷期： 2017 年 19 卷 6 期

页码：

收录情况： SCI

摘要： Nutrient uptake and storage at fall is important for improving tree stock quality. Fertilization during late-season has been proven to efficiently improve inherent nutrient storage in coniferous and some hardwood species, but information about poplar is limited. With the aim to quantify characteristics of NH4+ and NO3- fluxes in poplar roots at fall, two poplar clones of #26 and #46 with contrasting growing performances were obtained from hybrids generated from the hybridization (Populus tomentasa x P. bolleana and P. alba x P. glandulosa as male and female parents, respectively) and cultured as rooted grafted cuttings to receive pre-treatments of three-time fertilization (N, P2O5, and K2O, 5, 4.5, and 0.5 g plant(-1)) at early May, June, and July 2008. Un-fertilized cuttings were labeled as the control and all cuttings were raised in pots for six months. In late September, shoot height of the 26 clone was greater by 6-71% relative to the 46 clone. In the pre-fertilization treatment, biomass increased by 21%, 23%, and 49% in leaves, stem, and root, respectively, in the 26 clone compared to the 46 clone. Pre-fertilized cuttings of the 26 clone had lower N concentration by 67% in stem but higher K concentration by 5% in leaves compared to the 46 clone. Vector diagnosis indicated that the pre-fertilization treatment countered N deficiency and induced steady-state loading of P relative to the control. At fall, pre-fertilization delayed the alternation of NH4+ flux from efflux to influx for about 10 min in the 26 clone and resulted in a general NH4+ influx in the 46 clone. Meanwhile the fertilization treatment converted the NO3- influx to efflux since the 6 min after experiment start. In conclusion, during the late-season, pre-fertilization resulted in a better nutrient status in hybrid poplar rooted cuttings of both clones, but NH4+ influx and NO(3)(-)efflux were only promoted in the 46 clone. Although the 26 clone had a better natural ability for stem biomass production and NH4+ uptake, the 46 clone may be more efficient in N uptake to receive fall fertilization. (C) 2017 Friends Science Publishers

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