摘要
经过二年的观察记录,基本掌握迎红杜鹃(Rhododendron mucronulatum Turcz.)的生长发育规律。其中,早春花朵开放包括花前预备期和花朵开放期,枝条动态生长表现为S曲线型,并可分为初长、快长、慢长和趋停4期。引种驯化的光照因子测试表明,立境相对光照强度以60％～90％为适;迎红杜鹃喜弱酸、适中性、稍耐碱的土壤,是北京园林露地引种最有希望的一种杜鹃花。运用逐步回归与相关分析筛选出对迎红杜鹃叶绿素含量影响最大的是叶片的Fe元素含量;其次为Ca元素,表现为比较明显的负相关影响,这进一步验证了华北碱性水土地区露地栽植杜鹃花的主要威胁来自植株潜性缺Fe和缺Fe失绿黄化。
On the basis of observation and recordation on R. mucronulatum during 2 years, its regular pattern of growth and development is found out. The inflorescence in early spring time includes pre-blooming preparation and blooming period. The development of shoots is modelled S-type curve and divided into 4 stages:sprout, rapid growth, slow growth and stagnation. The light condition of R. mucronulatum adapts to 60%~90% relative light density. This trial confirms R. mucronulatum acidulous-loving, neutral-adaptive and alkaline-tolerant. According to the results of stepwise regression and correlative analysis, it is the Fe content of leaf that influences the chlorophyll content seriously. Thus, the chlorosis is caused by Fe-deficiency or Ca-excessiveness. The study demonstrates furthermore that potential Fe-deficiency and chlorosis is the key threat of rhododendrons or azaleas cultivated in alkaline Northern China.
出处
《园艺学报》
CAS
CSCD
北大核心
1993年第2期181-186,共6页
Acta Horticulturae Sinica
关键词
迎红杜鹃
杜鹃
引种
栽培
Rhododendron mucronulatum
Growth and development
Introduction and cultivation
Potential Fe-deficinecy and chlorosis
