摘要
罗布麻对锂具有一定的富集作用，锂对于罗布麻生长可能有益。本文采用沙培试验方法，研究了根施及叶面喷施方式下不同锂浓度处理对一年生罗布麻生长、叶绿素含量及其荧光特性的影响。结果表明，无论叶面喷施或根施，不同锂浓度处理对一年生罗布麻生长状况均表现出较为明显的影响，在一定浓度范围（0～10mg／kg）内，随着锂浓度的增加，叶绿素荧光参数（包括Fv／Fm/Fv／Fo、ψo、φEo、PIABs、叶绿素含量、叶绿素a／叶绿素b值、Sm）、罗布麻生长量、株高、茎粗及主叶对数和侧枝数等均有所增加，说明适宜的锂供应有利于罗布麻的生长。但随着供应浓度的进一步提高，各项生长及荧光指标呈降低趋势，因此过量的锂供应会抑制罗布麻生长，而且有益与有害之间的范围很小，在实际罗布麻栽培中要严格控制锂施用量。
Pot experiments were used to identify the effects of lithium levels on growth, chlorophyll content and chlorophyll fluorescence parameters of Apocynum wenetum. When A. wenetum was exposed to lithium either by foliage spray or root application, variation lithium level had an obvious influence on plant growth and appear ante. The concentrations of lithium used were O, 5, 10 and 20 mg/kg, and growth rate and fluorescence pa rameters （including Fv/Fm, Fv/Fo, ψo, φEo＇ PIABs, photosynthetic pigments contents, Sin） of A. wenetum were measured. All parameters significantly increased in proportion to lithium application rate at lower lithium levels, but growth and fluorescence parameters were generally lower at 20 mg/kg than at 10 mg/kg, at higher levels, indicating toxicity at the higher rate. Similarly, stem diameter, plant height, and the number of leaves on the main and branch of A. wenetum were also responsive to lower levels of applied lithium. The margin be- tween beneficial and toxic lithium concentrations was very small. Therefore, the lithium concentration in plant growth media or foliar application should be strictly controlled when cultivating A. wenetum.
出处
《草业学报》
CSCD
北大核心
2015年第1期81-87,共7页
Acta Prataculturae Sinica
基金
中国科学院西部专项(KZCX2-XB3-07)
自治区科技重大专项(201130106-2)资助
关键词
罗布麻
锂
叶绿素荧光
Apocynum venetum
lithium
chlorophyll fluorescence
