摘要
本实验以匍匐茎型克隆植物野牛草为材料,通过测定其在同质营养和3个斑块尺度的异质营养条件下生长指标、形态指标和叶绿素荧光参数的变化,研究野牛草对异质营养的表型可塑性反应。野牛草在尺度为25cm×25cm异质营养条件下会产生更多的分株、丛和分枝,积累更多的生物量,具有较高的Fv/Fm和ΦPSⅡ,生长状况要好于其他营养条件,但根系长度和间隔子长度并没有明显的变化。结果表明,生理整合调控了野牛草的表型可塑性,提高了母株的叶绿素荧光特性,增加了克隆分株对养分的吸收、利用能力,使野牛草在异质营养条件下的生长状况好于同质营养条件,特别是在尺度为25cm×25cm的异质营养条件下效果更为明显。
Phenotypic responses of ramets of the stoloniferous clonal plant Buchloe dactyloides in homogeneous nutrient and under three scales of heterogeneous nutrients were studied by measuring the growth, morphological characters of clonal ramets and the chlorophyll fluorescence characteristics of mother ramets. Compared with other nutrient treatments, the number of ramets, clumps and stolons, biomass, Fv/Fm and ФPS Ⅱ were higher in plots of heterogeneous nutrient at 25 cm× 25 cm spacing. However, different nutrient conditions did not prompt significant differences in internode and root length. These results suggested that physiological integration modifies phenotypic plasticity of clonal ramets for efficient absorption and utilization of nutrients, and increases the chlorophyll fluorescence of mother ramets in heterogeneous nutrient. These effects were more pronounced when the spacing was 25 cm×25 cm.
出处
《草业学报》
CSCD
北大核心
2014年第3期104-109,共6页
Acta Prataculturae Sinica
基金
国家林业局948项目(2012-4-44)
国家自然科学基金项目(31070625)资助
关键词
克隆植物
表型可塑性
生理整合
野牛草
异质营养
clonal plant
phenotypic plasticity
physiological integration
Buchloe dactyloides
nutrient heterogeneity
