摘要
以黄土高原4个乡土树种的幼苗为试验材料,采用盆栽方式模拟土壤干旱环境,研究土壤干旱对不同树种水分代谢与渗透调节物质的影响。结果表明,大叶细裂槭、虎榛子叶水势、叶片含水量下降迅速,叶片离体保水能力降幅明显;白刺花、辽东栎则表现为叶水势、叶片含水量缓慢下降,组织相对含水量在中度胁迫下略有上升。白刺花在不同水分处理条件下离体叶片保水力明显高于其它树种。4个树种可溶性糖含量随土壤干旱程度加剧明显增加,可溶性蛋白质含量在树种之间变化较为复杂,无明显规律性。K+离子含量和游离脯氨酸含量在中度水分胁迫下均有不同程度升高。白刺花在土壤干旱进程中,可溶性蛋白质含量、K+离子含量和游离脯氨酸含量均明显高于其它树种。综合水分代谢和渗透调节物质来看,水分胁迫条件下,白刺花以保持高水势、减少组织水分散失和增加渗透调节物质来提高细胞原生质浓度,增强其抗旱性。
Using four local species of Loess Plateau as experiment materials and pot culture experiments simulating different soil water status, this paper mainly deals with effect of soil water stress on water metabolism and osmotic adjustment substance of different tree species of Loess Plateau. The results showed that leaf water potential, water content and leaf water retention capability of Acer stenolobum Rehd.var. megalophyllum and Ostryopsis davidiana descended rapidly. Leaf water potential and water content of Sophora viciifolia and Quercus liaotungensis descending slowly. Leaf water retention capability of Sophora viciifolia surpassed significantly others tree species under different soil water stress. Soluble sugar content of four materials increased obviously with soil water stress ascending and soluble protein content among four species had no obvious regular. K^+ content and Pro increased under media water stress. During soil drought stress, soluble protein content,K^+ content and Pro of Sophora viciifolia surpassed obviously others tree species. According to water metabolism and osmotic adjustment substance, Sophora viciifolia has fine drought capability.
出处
《西北植物学报》
CAS
CSCD
2004年第10期1822-1827,共6页
Acta Botanica Boreali-Occidentalia Sinica
基金
中国科学院西部之光人才基金项目
知识创新项目(KZCX01-6)
关键词
乡土树种
水分代谢
渗透调节
抗旱性
native tree species
water metabolism
osmotic adjustment
drought
