论文部分内容阅读
以甘肃民勤小果沙枣和大果沙枣为试验材料,用沙培盆栽的方法,分别用含0、0.3%、0.6%、0.9%和1.2%和1.5%NaCl的Hoagland溶液处理沙枣幼苗,28d后测定植株株高、鲜重、干重、含水量和不同部位的Na~+和K~+含量,以确定其耐盐阈值和耐盐方式。结果表明,随着NaCl浓度增加,小果沙枣和大果沙枣株高、干重、鲜重都呈下降趋势。其中,相同浓度NaCl处理,小果沙枣鲜重与干重下降幅度较大;随NaCl浓度增加,两种沙枣含水量呈下降趋势;相同浓度NaCl处理,两种沙枣地下部分含水量没有明显差异,而小果沙枣地上部分含水量明显低于大果沙枣;随NaCl浓度增加,小果沙枣、大果沙枣地上部分和地下部分的Na~+含量整体上均呈上升趋势;相同浓度NaCl处理小果沙枣成熟叶、根中Na~+含量明显高于大果沙枣。综上,大果沙枣、小果沙枣的耐盐机理均以拒盐为主。小果沙枣耐盐阈值为0.96%,约165mmol/L;大果沙枣耐盐阈值为1.30%,约225mmol/L,由此得出大果沙枣耐盐能力优于小果沙枣。
In this paper, the stems and leaves of Gansu Minqin jujube and Dachuozao jujube were treated with sand and peat potted plants, and treated with Hoagland solution containing 0,0.3%, 0.6%, 0.9% and 1.2% NaCl and 1.5% NaCl respectively After 28 days, the plant height, fresh weight, dry weight, water content and Na ~ + and K ~ + contents in different parts of the seedlings were measured to determine the salt tolerance threshold and salt tolerance. The results showed that with NaCl concentration increasing, the plant height, dry weight and fresh weight of jujube and jujube decreased. Among them, the same concentration of NaCl treatment, small fruit sand jujube fresh weight and dry weight decreased significantly; with the increase of NaCl concentration, two kinds of jujube water content showed a downward trend; the same concentration of NaCl treatment, the two parts of the jujube water content did not While the content of Na + in the aerial part and the underground part of A.japonicus and P.japonicus increased with the increasing of NaCl concentration ; The same concentration of NaCl treatment of mature fruit jujube leaf, root Na + content was significantly higher than the jujube. In summary, the fruit jujube, fruit jujube salt tolerance mechanisms are mainly salt. The salt tolerance threshold value of A. przewalskii was 0.96% and about 165 mmol / L, while the salt tolerance threshold value of D. przewalskii was 1.30% and about 225 mmol / L, respectively.