模拟冬季低温和夜间退潮对无瓣海桑幼苗的协同作用  

Synergistic effects of low temperature in winter and ebb tide at night on Sonneratia apetala seedlings growth and key eco-physiological traits

作　　者：陈鹭真[1,2] 杜晓娜[1,2] 陆銮眉[3] 郑仕杰[2] 杨盛昌[1,2] 

机构地区：[1]厦门大学环境与生态学院,福建厦门361005 [2]厦门大学生命科学学院,福建厦门361005 [3]漳州师范学院生物科学与技术系,福建漳州363000

出　　处：《应用生态学报》2012年第4期953-958,共6页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金项目(30700092);福建省自然科学基金项目(2009J05085)资助

摘　　要：利用人工控制手段,模拟冬季低温和夜间低潮对无瓣海桑幼苗的影响,分析气温-水温协同作用下无瓣海桑幼苗的低温适应机制.结果表明:低温显著抑制了无瓣海桑幼苗株高和基径的增长,而提高水温5℃对其的缓解作用分别达41.2%和44.6%;低气温(15℃)显著降低了叶片的最大光化学效率(Fv/Fm)值,进而影响叶片的光合能力,而提高水温未能显著缓解其损伤;低气温时,提高水温能促进幼苗叶片脯氨酸的积累,增加可溶性糖含量,缓解低温对叶片的伤害.极端低温发生时,夜间高潮对幼苗起到较好的保温作用,缓解了低温对幼苗生长和叶片的生理伤害,提高了无瓣海桑幼苗的成活率.By setting up a set of simulated tidal systems with different air-and water temperature and tidal flood conditions,this paper studied the synergistic effects of low temperature in winter and ebb tide at night on the growth and key eco-physiological traits of Sonneratia apetala seedlings.Low air temperature depressed the seedlings growth,but the reduction in the seedling height and basal stem diameter was compensated 41.2% and 44.6%,respectively by a 5 ℃ increase of water temperature.Low air temperature（15 ℃） reduced the leaf Fv/Fm significantly,indicating a dramatic reduction in the leaf photosynthetic capacity,whereas the flooded tide with higher water temperature could not compensate this damage.The flooded tide with high air temperature increased the proline and soluble sugar contents in mature leaves,which could protect the mature leaves from cold damage.When extreme cold events occurred,the flooded tide at night worked as a heat storage medium,which alleviated the cold damage on the seedlings growth and leaf physiological traits,and promoted the survival rate of S.apetala seedlings.

关 键 词：红树林 无瓣海桑 寒害 潮汐 叶绿素荧光 可溶性糖 脯氨酸 

分 类 号：S792.99[农业科学—林木遗传育种]