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盐胁迫对不同生境白榆生理特性与耐盐性的影响
引用本文:刘炳响,王志刚,梁海永,杨敏生.盐胁迫对不同生境白榆生理特性与耐盐性的影响[J].应用生态学报,2012,23(6):1481-1489.
作者姓名:刘炳响  王志刚  梁海永  杨敏生
作者单位:1. 河北农业大学林学院,河北保定,071000
2. 河北农业大学林学院,河北保定071000;河北省林木种质资源与森林保护重点实验室,河北保定071000
基金项目:林业公益性行业科研专项(201004024);河北省盐山县国家抗盐碱树种良种基地项目资助
摘    要:以中强度盐土、轻度盐土和非盐土3种生境白榆种子实生苗为试验材料,研究了不同程度盐胁迫(CK、2、4、6、8和10 g·kg-1)条件下3种生境白榆幼苗的耐盐阈值及生理特性.结果表明:随着土壤盐浓度的增加,中强度和轻度盐土生境白榆幼苗叶片的细胞膜透性、Na+含量和Na+/K+增幅低于非盐土生境;叶片的脯氨酸、可溶性糖和K+含量增幅高于非盐土生境;叶片淀粉含量、净光合速率、蒸腾速率、胞间CO2浓度和气孔导度降幅小于非盐土生境.不同生境白榆耐盐性的强弱顺序为:中强度盐土生境(7.76 g·kg-1)>轻度盐土生境(7.37g·kg-1)>非盐土生境(6.95 g·kg-1).与非盐土生境相比,中强度和轻度盐土生境白榆各项生理指标对盐土环境的适应能力更强.

关 键 词:白榆  盐胁迫  生境  生理特性  隶属函数  耐盐阈值

Effects of salt stress on physiological characters and salt-tolerance of Ulmus pumila in different habitats
Liu Bing-Xiang,Wang Zhi-Gang,Liang Hai-Yong,Yang Min-Sheng.Effects of salt stress on physiological characters and salt-tolerance of Ulmus pumila in different habitats[J].Chinese Journal of Applied Ecology,2012,23(6):1481-1489.
Authors:Liu Bing-Xiang  Wang Zhi-Gang  Liang Hai-Yong  Yang Min-Sheng
Institution:College of Forestry, Agricultural University of Hebei, Baoding 071000, Hebei, China.
Abstract:Taking the Ulmus pumila seedlings from three different habitats (medium-, mild-, and non-saline soils) as test materials, an experiment was conducted to study their salt-tolerance thresholds and physiological characteristic under different levels (0, 2, 4, 6, 8, and 10 g X kg(-1)) of salt stress. With increasing level of the salt stress, the seedlings taken from medium- and mild- saline habitats had a lower increment of leaf membrane permeability, Na+ content, and Na+/K+ but a higher increment of leaf proline, soluble sugar, and K+ contents, and a lower decrement of leaf starch content, net photosynthetic rate, transpiration rate, intercellular CO2 concentration, and stomatic conductance, as compared with the seedlings taken from non-saline habitat. The salt-tolerance thresholds of the seedlings taken from different habitats were in the order of medium- saline habitat (7.76 g X kg(-1)) > mild- saline habitat (7.37 g X kg(-1)) > non-saline habitat (6.95 g X kg(-1)). It was suggested that the U. pumila seedlings in medium- and mild-saline habitats had a stronger adaptability to saline soil environment than the U. pumila seedlings in non-saline soil environment.
Keywords:
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