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丽色画眉(Eragrostis spectabilis)耐盐特征研究
陈超,刘潇红,张奇,刘宏,袁小环
0
(北京草业与环境研究发展中心,北京 100097; 农业部都市农业(北方)重点实验室,北京 100097;北京草业与环境研究发展中心,北京 100097; 中国林业科学研究院,北京 100091;北京草业与环境研究发展中心,北京 100097; 北京农学院,北京 102206)
摘要:
采用石英砂作为基质,以不同比例的海水浓度浇灌丽色画眉进行盆栽实验。结果表明,随海水浓度的增加,丽色画眉的总生物量、叶宽呈现先增后降的趋势;分蘖数和叶绿素相对含量呈现下降的趋势,但没有显著的差异;比较所有浇灌海水的处理组和对照组,丽色画眉的根冠比都极显著降低(P<0.01)。丽色画眉地上和地下部分盐分离子分析表明,其地上生物量随Na+、Cl-含量增加而先升后降;对于地下部分,Na+、Cl-含量和地下生物量成幂数关系,各处理组K+含量没有明显的差异。丽色画眉根系有选择性地向地上部分运输盐分离子的特征,但对于阳离子K+、Na+的吸收存在差异,无海水添加时,优先选择吸收K+;海水浓度增加时,Na+的吸收增加而K+的吸收受到抑制。
关键词:  根冠比  海水  丽色画眉
DOI:10.13610/j.cnki.1672-352x.20150424.003
基金项目:草种质资源收集、评价与创新(KJCX20140103)资助。
Salt tolerance of purple lovegrass (Eragrostis spectabilis)
CHEN Chao,LIU Xiaohong,ZHANG Qi,LIU Hong,YUAN Xiaohuan
(Beijing Research and Development Center for Grass and Environment, Beijing 100097; Key Laboratory of Urban Agriculture (North), Ministry of Agriculture, Beijing 100097;Beijing Research and Development Center for Grass and Environment, Beijing 100097; Chinese Academy of Forestry Science, Beijing 100091;Beijing Research and Development Center for Grass and Environment, Beijing 100097; Beijing University of Agriculture, Beijing 102206)
Abstract:
In this study, a pot experiment was conducted to analyze the effect of seawater on purple lovegrass using quartz sand as a substrate. The results showed that biomass and leaf width of purple lovegrass slightly increased with a low concentration of seawater and a decrease was observed with an increase of salt concentration in the irrigation water. However, the relative content of chlorophyll and the tiller number showed a slight decrease trend with the irrigation treatment. Compared to the control group, there was a downward trend on the root-shoot ratio with a significant difference (P<0.01). The analysis also showed a significantly negative correlation between salt ions (Na+, Cl-) and aboveground biomass. Contents of Na+ and Cl- in the underground biomass presented an exponential relationship. K+ content in treatment groups had no obvious difference. Moreover, purple lovegrass roots selectively translocated salt ions to the above ground part. It preferred to K+ absorption with no seawater addition and Na+ absorption increased, but K+ uptake was restrained with the increasing seawater concentration.
Key words:  root-shoot ratio  sea water  purple lovegrass

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