摘要
一年生植物是干旱半干旱地区植被的重要组成部分,是许多植物生态学关键问题研究的良好试验材料。为研究荒漠区一年生植物雾冰藜(Bassia dasyphylla)对盐碱生境的适应能力,采用2种中性盐NaCl、Na_2SO_4及2种碱性盐Na_2CO_3、NaHCO_3按不同比例混合成30种溶液对雾冰藜种子进行胁迫处理。结果表明:在所模拟的均匀覆盖了总盐度50~250mmol·L^(-1)、pH 7.10~10.19范围内的30种盐碱条件下,雾冰藜的各项萌发参数和生长指标在对照组(CK)下最高,且均随盐浓度及pH的升高而下降,各处理组与对照组间存在显著差异(P<0.05);盐度、pH及二者之间的交互作用对萌发和生长指标均有显著抑制作用(P<0.05);不同盐碱组分对雾冰藜种子萌发和幼苗生长的抑制作用表现为Na2CO3>NaHCO_3>NaCl>Na_2SO_4。雾冰藜种子在萌发阶段比幼苗生长阶段对盐碱胁迫更敏感,盐度是种子萌发的主要胁迫因素,pH值则是幼苗建植的主要胁迫因素。盐碱条件下盐度和pH之间交互作用对雾冰藜种子萌发阶段和幼苗建植的抑制影响比单一的盐或碱胁迫的影响大。
Annual plant species are the main component of the vegetation in arid and semi-arid desert re- gions, with their unique traits as the good candidates for the study of many key bio-ecological issues. This paper studied the response of various salt-alkaline stress on seed germination and growth of annual plant Bassia dasyphylla in desert region. Thirty different salt-alkaline ecological conditions, which evenly cov- ered all the cases within the ranges of 50--250 mmol.L 1 salinity and 7.10--10.19 pH values, were simula- ted by mixtures of varied proportions of sodium salts of chloride, carbonate, bicarbonate and sulphate. The germination indexes of germination rate, germination speed, germination index, seeding vigor index and growth indices of shoot length, root length, fresh weigh were determined. The results showed that germi- nation indexes and growth indices of treatment group were significantly lower than control group, were both decreased with increasing salinity and pH, and were found significant different （P^0.05） from the negative control group. All of the indexes were also restraining affected by salinity, pH and their interactions （p〈 0.05）. The order of rejection capability of sodium salts of chloride, carbonate, bicarbonate and sulphate was Na2CO3〉NaHCO3〉NaCI〉Na2 SOt. The effects of the interaction between high alkalinity and salinity are more severe than those of either salt or alkali stress, and such a cooperative interaction results in more sen- sitive responses of seed germination and seedling growth of B. desyphvlle. Salinity was the dominant fac- tor for seed germination under mixed salt-alkaline stress conditions, and pH changed into the dominant fac- tor for seedling establishment. Further, It was concluded that the mixed salt-alkaline stresses, which differ from either salt or alkali stress, emphasize the significant interaction between salt concentration （salinity） and salt component （alkalinity）.
作者
李辛
赵文智
Li Xin1, Zhao Wenzhi1＇ 2(1 .College of Forestry, Gansu Agricultural University, Lanzhou 730070, China; 2 .Linze Inland River Basin Research Station, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, Chin)
出处
《中国沙漠》
CSCD
北大核心
2018年第2期300-306,共7页
Journal of Desert Research
基金
国家自然科学基金项目(41471435)
