文献类型：期刊文献

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

作者：Zhao, Yan[1,6] Wang, Hui[2] Li, Jiyue[3] Dong, Wenyi[4] Wei, Hongxu[5] He, Chunxia[6]

第一作者：Zhao, Yan

通信作者：Li, JY[1];He, CX[2]

机构：[1]Henan Univ Sci & Technol, Forestry Coll, Luoyang 471002, Peoples R China;[2]Henan Univ Sci & Technol, Coll Chem & Pharmaceut, Luoyang 471002, Peoples R China;[3]South China Agr Univ, Coll Forestry, Guangzhou 510642, Guangdong, Peoples R China;[4]Chinese Acad Agr Sci, Key Lab Dry Land Agr, Inst Environm & Sustainable Dev Agr, Beijing 100081, Peoples R China;[5]Chinese Acad Sci, Northeast Inst Geog & Agr Ecol, Changchun 130102, Jilin, Peoples R China;[6]Chinese Acad Forestry, Res Inst Forestry, State Forestry Adm, Key Lab Tree Breeding & Cultivat, Beijing 100091, Peoples R China

年份：2017

卷号：19

期号：6

起止页码：1525-1534

外文期刊名：INTERNATIONAL JOURNAL OF AGRICULTURE AND BIOLOGY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000416107100033)】；

基金：Funding for this study was supported by the National Natural Science Foundation of China (No. 31400385; 31670616; 41201224), the Fundamental Research Funds for the Central Non-profit Research Institution of CAF (No. CAFYBB2014QB027), the Specialized Research Fund for Young Scholars of the Research Institute of Forest-ry, Chinese Academy of Forestry (No. RIF2013-08) and the Starting Foundation for Doctors of Henan University of Science and Technology (No. 09001520).

语种：英文

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

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