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盐胁迫下构树幼苗各器官中K+、Ca2+、Na+和Cl-含量分布及吸收特征
引用本文:杨帆,丁菲,杜天真. 盐胁迫下构树幼苗各器官中K+、Ca2+、Na+和Cl-含量分布及吸收特征[J]. 应用生态学报, 2009, 20(4): 767
作者姓名:杨帆  丁菲  杜天真
作者单位:江西农业大学园林与艺术学院, 南昌 330045
基金项目:国家林业局重点研究项目,高等学校博士学科点专项科研基金 
摘    要:将当年生构树幼苗置于含有不同浓度(04、1、2、3、4 g·kg-1)NaCl的土壤中,研究其生物量积累、叶片细胞质膜透性和K+、Ca2+、Na+、Cl-等离子的吸收、分布及运输,并观察盐害症状.结果表明:构树幼苗的叶片质膜透性随着NaCl浓度的增加和胁迫时间的延长而升高,根冠比随NaCl浓度的升高而增加,大于3 g·kg-1的土壤盐胁迫对构树叶片的质膜透性及植株的生物量积累影响显著.构树幼苗各器官中Na+和Cl-含量随土壤NaCl浓度升高而显著增加,K+和Ca2+则随之降低,叶片各离子含量均明显高于根和茎.说明盐胁迫影响根系对K+和Ca2+的吸收,并抑制了它们向地上部分的选择性运输,使叶和茎的K+和Ca2+含量下降.构树通过吸收积累Na+和Cl-抵御土壤盐分带来的渗透胁迫,但过量的Na+和Cl-积累会造成单盐毒害.作为抗盐性较高的非盐生植物,构树地上部分的拒盐作用不显著.

关 键 词:降水量距平百分率  季节性干旱  中国南方  
收稿时间:2008-09-09

Absorption and allocation characteristics of K+, Ca2+, Na+ and Cl- in different organs of Broussonetia papyrifera seedlings under NaCl stress.
YANG Fan,DING Fei,DU Tian-zhen. Absorption and allocation characteristics of K+, Ca2+, Na+ and Cl- in different organs of Broussonetia papyrifera seedlings under NaCl stress.[J]. The journal of applied ecology, 2009, 20(4): 767
Authors:YANG Fan  DING Fei  DU Tian-zhen
Affiliation:College of Garden and Art, Jiangxi Agricultural University, Nanchang 330045, China
Abstract:One-year-old Broussonetia papyrifera seedlings were subjected to 04, 1, 2, 3, and 4 g·kg-1 of soil NaCl stress, and their biomass accumulation, leaf plasma membrane permeability, and the absorption, allocation and translocation of K+, Ca2+, Na+, and Cl-, as well as the symptoms of salt injury, were studied and investigated. The leaf plasma membrane permeability increased with the increase of soil NaCl concentration and of the duration of soil NaCl stress, and the seedling’s root/shoot ratio also increased with increasing soil NaCl concentration. When the soil NaCl concentration exceeded 3 g·kg-1, leaf plasma membrane permeability and seedling’s biomass accumulation were affected significantly. The Na+ and Cl- concentrations in different organs of seedlings increased with increasing soil NaCl concentration while the K+ and Ca2+ concentrations were in adverse, and the ion contents in leaves were always much higher than those in other organs, illustrating that soil NaCl stress affected the K+ and Ca2+ absorbing capability of roots, and inhibited the selective translocation of K+ and Ca2+ to aboveground parts. As a result, the K+ and Ca2+ concentrations in leaves and stems decreased. The study showed that B. papyrifera could effectively resist the injury of osmotic stress from soil salt via absorbing and accumulating Na+ and Cl-, but excessive accumulation of Na+ and Cl- could induce salt toxicity. As a non-halophyte species with relatively strong salt resistance, the aboveground parts of B. papyrifera did not have significant salt-exclusion effect.
Keywords:percentage of precipitation anomaly   seasonal drought   southern China.  
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