盆栽桐花树对不同遮光度的生理生态响应  

Eco-physiological responses of pot-planted Aegiceras corniculatum to different shade levels

作　　者：刁俊明[1] 陈桂珠[2] 

机构地区：[1]嘉应学院生命科学学院,广东梅州514015 [2]中山大学环境科学与工程学院,广州510275

出　　处：《生态学杂志》2011年第4期656-663,共8页Chinese Journal of Ecology

基　　金：联合国环境规划署/全球环境基金项目(GF/2730-02-4340);广东省科技计划项目(2010B031900044);广东省科技计划项目(2009198)资助

摘　　要：盆栽红树植物桐花树(Aegiceras corniculatum)1年生幼苗,研究了在浇灌淡水和人工海水2种情况下不同遮光度(透光率25%、45%和100%)处理对盆栽桐花树生理生态的影响。结果表明,处理360d后,在相同盐度处理下植株的茎高年增量随光照强度减弱而增大,3种光照强度处理之间差异极显著,而茎径年增量则与茎高年增量相反。平均每株分枝数、叶片数、叶面积和叶片厚度存在显著差异。在相同盐度处理下,光照强度25%和45%处理的植株叶片叶绿素a、叶绿素b、总叶绿素含量无显著差异,但均显著高于100%光照强度,而6种处理植株叶片叶绿素a/b比值没有显著差异。在相同盐度处理下,随着光照强度的降低,净光合速率、可溶性糖含量、硝酸还原酶(NR)活性和根系活力均呈下降趋势,且不同光照强度处理间存在极显著差异。在同一光照强度下,淡水组的可溶性糖含量、NR活性和根系活力均比人工海水组低。试验表明,遮光对盆栽桐花树的生理生态有显著影响。One-year-old Aegiceras corniculatum seedlings were planted in pots under 3 light intensities,i.e.,full sunlight,45% sunlight,and 25% sunlight,aimed to study the eco-physiological responses of the seedlings to different shade levels after irrigated with fresh water and artificial seawater.After treated for 360 d,the annual increment of height growth at the same water salinities increased significantly with increasing light intensity,and had significant differences among the three light intensity treatments.On the contrary,the annual increment of stem diameter decreased significantly.The average branch number,leaf number,leaf area,and leaf thickness all existed significant differences among the treatments.At the same water salinities,the leaf chlorophyll a,chlorophyll b,and total chlorophyll contents had no significant differences under 25% and 45% sunlight but were significantly higher than those under full sunlight,while the chlorophyll a/b ratio had less difference among all the treatments.The net photosynthetic rate,soluble sugar content,nitrate reductase activity,and root vigor at same water salinities decreased significantly with the reduction of light intensity.Under the same light intensities,the seedlings irrigated with fresh water had lower soluble sugar content,nitrate reductase activity,and root vigor,compared with those irrigated with sea water.Our results indicated that shading had significant effects on the eco-physiology of pot-planted A.corniculatum.

关 键 词：桐花树 淡水 人工海水 光照强度 生理响应 

分 类 号：S792.99[农业科学—林木遗传育种]