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选取4种适宜于西宁盆地及其周边地区生长的老芒麦(Elymus sibiricus Linn.)、垂穗披碱草(Elymus nutans Griseb.)、柠条锦鸡儿(Caragana korshinskii Kom.)、霸王(Zygophyllum xanthoxylon Maxim.)作为供试种,采用室内种植方式进行0、30、60、90、120 mmol/L 5种浓度的Na_2SO_4溶液胁迫试验。研究4种植物地茎(径)、株高、干重等生长指标及地上和地下部分Na~+、K~+、Ca~(2+)、Mg~(2+)、Cl~-、SO_4~(2-)6种易溶盐离子含量,探讨4种植物的耐盐性特征。结果表明:盐胁迫对4种植物的生长具有一定抑制效应,其地茎(径)、株高、干重均逐渐降低,其中盐胁迫条件下对老芒麦的抑制作用相对较为显著,其次为垂穗披碱草、霸王和柠条锦鸡儿;随着胁迫浓度增加,4种植物地上和地下部分Na~+和SO_4~(2-)含量显著增加,而K~+、Ca~(2+)、Mg~(2+)、Cl~-含量呈逐渐降低;柠条锦鸡儿地上部分K~+/Na~+值相对较高,为0.73~9.70,其次为霸王和垂穗披碱草,为0.46~8.35和0.45~7.57,老芒麦相对较低,为0.25~6.12,表明区内4种植物耐盐性由大至小依次为柠条锦鸡儿、霸王、垂穗披碱草、老芒麦。研究结果对于西宁盆地及其周边地区开展利用植物有效防治土地盐渍化具有理论指导意义。
Four species of Elymus sibiricus Linn., Elymus nutans Griseb., Caragana korshinskii Kom. And Zygophyllum xanthoxylon, which are suitable for growing in the Xining basin and its surrounding areas, Maxim) was used as the test, and indoor cultivation methods were used to carry out stress tests at 0, 30, 60, 90 and 120 mmol / L of 5 concentrations of Na 2 SO 4 solution. The growth indexes such as stem diameter, plant height and dry weight of four plants and the contents of Na ~ +, K ~ +, Ca ~ (2 +), Mg ~ (2 +), Cl ~ -, SO_4 ~ (2-) 6 kinds of soluble salt ion content, salt tolerance characteristics of four species of plants. The results showed that salt stress had some inhibitory effects on the growth of four species of plants. The stem diameter, plant height and dry weight decreased gradually. Elymus natans, Caragana korshinskii and Caragana korshinskii. With the increase of stress concentration, the contents of Na ~ + and SO_4 ~ (2-) in aboveground and underground parts of four plants increased significantly, while K ~ +, Ca ~ (2+ ), Mg ~ (2 +) and Cl ~ - decreased gradually. The K ~ + / Na ~ + value of Caragana korshinskii was relatively high at 0.73 ~ 9.70, followed by overlord and Elymus natans, From 0.46 to 8.35 and from 0.45 to 7.57, respectively. The relative content of Elymus sibiricum was 0.25-6.12, indicating that the salt tolerance of the four species in the area was Caragana korshinskii, Sommelier The results of this study have theoretical significance for the effective prevention and treatment of land salinization in Xining Basin and its surrounding areas.