西北林学院学报2017，Vol.32Issue(2)：8-15,8.DOI:10.3969/j.issn.1001-7461.2017.02.02
NaHCO3胁迫对宁夏4种灌木生长及光合特性的影响
Effects of NaHCO3 Stress on the Growth and Photosynthetic Characteristics of Four Shrubs in Ningxia
摘要
Abstract
A pot experiment was carried out to investigate the NaHCO3 stress on the growth and photosynthetic characteristics of 4 shrub species,Lycium ruthenicum,Hippophae rhamnoides,Shepherdia argentea and Tamarix chinensis.Five different levels of NaHCO3 were set:0,250,500,750,and 1 000 mmol · L-1.The results showed that 1) with the increase of NaHCO3 concentration,the seedling growth was obviously inhibited.The plant height and biomass accumulation decreased,as well as net photosynthetic rate (Pn),transpiration rate and chlorophyll relative value.The decreasing amplitude of the growth index of four plants was in the order of L.ruthenicum＜T.chinensis＜S.argentea＜H.rhamnoides.2) With the increase of salt-stress time,when the salt concentration was less than 500 mmol · L-1,Pn of L.ruthenicum and T.chinensis decreased at first and then increased,showing that plants had adapted to the NaHCO3 concentration,and the L.ruthenicum and T.chinensis also showed relatively high NaHCO3 tolerance.3) Under the lower concentration of NaHCO3 treatment,S.argentea and H.rhamnoides improved the NaHCO3 tolerance by increasing root/shoot ratio,L.ruthenicum and T.chinensis changed not obviously among different treatments.4) The salt tolerance threshold for L.ruthenicum was 600 mmol· L-1,516 mmol · L-1 for T.chinensis,470 mmol · L-1 for S.argentea and 303 mmol · L-1 for H.rhamnoides.Based on the analysis of growth and photosynthetic characteristics,the NaHCO3 tolerance of four plants were L.ruthenicum ＞ T.chinensis ＞S.argentea ＞ H.rhamnoides.关键词
NaHCO3胁迫/生长/生理特性/耐盐性Key words
NaHCO3 stress/growth/physiology characteristic/salt tolerance分类
农业科技引用本文复制引用
龚佳,倪细炉,李健..NaHCO3胁迫对宁夏4种灌木生长及光合特性的影响[J].西北林学院学报,2017,32(2):8-15,8.基金项目
国家科技攻关项目“宁夏主要退化土壤生态修复关键技术合作研究”(2015DFA90900). （2015DFA90900）
