| 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 |
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| 基金项目:草种质资源收集、评价与创新（KJCX20140103）资助。 |
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| 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 |
