应用生态学报2017，Vol.28Issue(7)：2254-2260,7.DOI:10.13287/j.1001-9332.201707.009
不同供钾水平对平邑甜茶幼苗生长及NO3-吸收利用特性的影响
Effects of different potassium levels on growth and NO3-uptake and utilization of Malus hupehensis seedlings
摘要
Abstract
In order to explore the effects of potassium fertilizer on the absorption and utilization of nitrogen fertilizer,and provide theoretical basis for scientific fertilization in apple orchard,Malus hupehensis seedlings were used to study the effects of different potassium levels (K0,K1,K2,K3,K4,K5,and K6 equivalent to 0,2,4,6,8,10,and 12 mmol · L-1K+,respectively) on growth and NO3-uptake and utilization using the track technology of 15N and non-damage microtest technique.The results showed that root vigor,nitrate reductase activity and root morphological index of seedlings in K3 treatment were significantly higher than those in the other treatments.The 15N derived from fertilizer (Ndff) in different organs of M.hupehensis seedlings was significantly different among treatments,and the Ndff values of root,stem and leaf appeared in K3 treatment were the highest,being 1.36,1.33 and 1.47 times as those of the K0 treatment,respectively.With the increase of potassium application rate,the 15N utilization rate of seedlings were firstly increased and then decreased,and reached the highest value (23.3％) in K3 treatment,which was 3.04 times as that of K0 treatment.The results of non-damage microtest technique showed that there was a strong absorption of NO3-in K3 treatment (19.34 pmol · cm-2 · s-1),while a clear trend of outflow was observed in the potassium deficiency (K0) and high potassium (K6) treatments.Therefore,the deficit or excess of potassium could inhibit the uptake and utilization of nitrogen,while appropriate potassium could promote root growth,enhance the activity of nitrate reductase,and then increase the absorption of nitrogen by seedlings.关键词
苹果/平邑甜茶/钾水平/氮素/吸收/利用Key words
apple/Malus hupehensis/potassium level/nitrogen/absorption/utilization引用本文复制引用
田歌,王芬,彭玲,何流,姜远茂,葛顺峰..不同供钾水平对平邑甜茶幼苗生长及NO3-吸收利用特性的影响[J].应用生态学报,2017,28(7):2254-2260,7.基金项目
本文由国家自然科学基金项目(31501713)、国家重点研发计划项目(2016YFD0201100)和国家现代农业产业技术体系建设资金项目(CARS-28)资助 This work was supported by the National Natural Science Foundation of China (31501713),the National Key Research and Development Program of China (2016YFD0201100),and the China Modem Agriculture Industry System Construction Foundation (CARS-28). （31501713）
