盐分和温度对盐节木幼苗早期生长的影响  

Effects of salt and temperature on early growth of Halocnermum strobilaceum (Chenopodiaceae) seedlings

作　　者：高瑞如[1,2] 赵瑞华[1] 杨学军[2] 杨慧玲[2,3] 黄振英[2] 

机构地区：[1]山西师范大学生命科学学院,山西临汾041004 [2]中国科学院植物研究所植被与环境变化国家重点实验室,北京100093 [3]河南农业大学生命科学学院,郑州450002

出　　处：《生态学报》2009年第10期5395-5405,共11页Acta Ecologica Sinica

基　　金：国家自然科学基金资助项目(30872074;30970461);国家科技基础条件平台建设项目(2005DKA21006);山西师范大学青年人才基金资助项目(YZ06013)

摘　　要：盐节木是新疆盐生荒漠中分布的优势植物种,对盐生生境具有适应性。利用野外调查和实验室控制实验相结合的方法,研究了温度、不同盐分类型(单盐NaCl或者土壤复合盐)和盐分浓度梯度对盐节木早期幼苗根长及鲜重的影响,探讨盐分和温度对幼苗生长的影响机制。研究结果表明,与对照相比,低浓度盐分(EC<6.25 dS/m)对盐节木幼苗根长具有明显促进作用,高于这一浓度,根长生长逐渐被抑制。15/25℃的变温最有利于幼苗根生长,高于或低于此温度,根长生长均被抑制,但这种变化因盐类型不同而变化。15/35℃的变温有利于盐节木幼苗生物量的积累,5/15℃不利于幼苗生物量的积累;幼苗生物量积累在盐分浓度为9.38 dS/m达到最大。温度、盐分浓度及盐类型对盐节木幼苗早期生长的影响具有明显的交互效应。复合盐对盐节木幼苗生长的抑制作用明显要小于单盐,可能是复合盐中的不同离子之间发生拮抗作用,削弱了单盐离子造成的毒害。Halocnermum strobilaceum,with the adaptability to saline habitats,is a dominant species in saline desert in Xinjiang.Effects of temperature and salt on root elongation and fresh weight of H.strobilaceum seedlings were studied through both field investigation and controlled experiments in laboratory.Our experiment applied three levels of temperature,two types of salt apply i.e.NaCl or soil multiple salts and six levels of salt concentration to seedling of H.strobilaceum.Compared with control,lower salt concentration which characterized as the electric conductance（E.C.） being lower than 6.25 dS/m significantly promoted root elongation,while root elongation was gradually inhibited by higher salt concentration（E.C.〉6.25 dS/m）.The diurnal temperature of 15/25 ℃ was the optimal temperature for root elongation,and growth of root was inhibited when the growing temperature was higher than this range.But the inhibition of root elongation varied with salt type.The seedling fresh weight（biomass） accumulation was favored at 15/35 ℃,but was not inhibited until 5/15 ℃.It was optimal for seedling biomass accumulation at E.C.being 9.38 dS/m.The interactions of temperature,salt concentration and salt type significantly influenced the seedling growth at early stage.NaCl inhibition to H.strobilaceum seedling growth was significantly higher than that of multiple salts at the same concentration,suggesting that antagonism may occur among ions in multiple salts solution and moderate the effects of ionic toxicity of single salt.

关 键 词：盐节木 土壤盐分 温度 幼苗鲜重 根长 

分 类 号：Q142[生物学—生态学] Q948[生物学—普通生物学]