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标题：Characteristics of NH4+ and NO3− fluxes in tea (Camellia sinensis) roots measured by scanning ion-selective electrode technique
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作者：Li Ruan ; Kang Wei ; Liyuan Wang 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2016
卷号：6
期号：1
DOI：10.1038/srep38370
语种：English
出版社：Springer Nature
摘要：As a vital beverage crop, tea has been extensively planted in tropical and subtropical regions. Nitrogen (N) levels and forms are closely related to tea quality. Based on different N levels and forms, we studied changes in NO3(-) and NH4(+) fluxes in tea roots utilizing scanning ion-selective electrode technique. Our results showed that under both single and mixed N forms, influx rates of NO3(-) were much lower than those of NH4(+), suggesting a preference for NH4(+) in tea. With the increase in N concentration, the influx rate of NO3(-) increased more than that of NH4(+). The NH4(+) influx rates in a solution without NO3(-) were much higher than those in a solution with NO3(-), while the NO3(-) influx rates in a solution without NH4(+) were much lower than those in a solution with NH4(+). We concluded that (1) tea roots showed a preference for NH4(+), (2) presence of NO3(-) had a negative effect on NH4(+) influx, and (3) NH4(+) had a positive effect on NO3(-) influx. Our findings not only may help advance hydroponic tea experiments but also may be used to develop efficient fertilization protocols for soil-grown tea in the future.