Liu Bing-Xiang, Wang Zhi-Gang, Liang Hai-Yong, Yang Min-Sheng
College of Forestry, Agricultural University of Hebei, Baoding 071000, Hebei, China.
Ying Yong Sheng Tai Xue Bao. 2012 Jun;23(6):1481-9.
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.
以取自三种不同生境（中度、轻度和非盐碱土壤）的榆树幼苗为试验材料，进行了一项实验，以研究它们在不同盐胁迫水平（0、2、4、6、8和10 g·kg⁻¹）下的耐盐阈值和生理特性。随着盐胁迫水平的增加，与取自非盐碱生境的幼苗相比，取自中度和轻度盐碱生境的幼苗叶片膜透性、Na⁺含量和Na⁺/K⁺的增量较低，但叶片脯氨酸、可溶性糖和K⁺含量的增量较高，叶片淀粉含量、净光合速率、蒸腾速率、胞间CO₂浓度和气孔导度的减量较低。取自不同生境的幼苗的耐盐阈值顺序为中度盐碱生境（7.76 g·kg⁻¹）＞轻度盐碱生境（7.37 g·kg⁻¹）＞非盐碱生境（6.95 g·kg⁻¹）。结果表明，中度和轻度盐碱生境中的榆树幼苗对盐碱土壤环境的适应性比非盐碱土壤环境中的榆树幼苗更强。
