盐碱胁迫对抗碱盐生植物碱地肤生长特性的影响

以天然盐生植物碱地肤为材料，利用人工生态模拟方法对其施加0～400mmol·L^-1的盐胁迫（摩尔比1：1的NaCl和Na2SO4）和碱胁迫（摩尔比1：1的NaHCO3和Na2CO3）．通过测定其相对生长率（RGR）等生理响应指标分析其抗盐、抗碱能力及特点，以期明确其生态定位的生理基础．结果表明：碱地肤不仅具有强抗盐性也具有强抗碱性，在高达400mmol·L^-1的盐胁迫或400mmol·L^-1的碱胁迫下仍能存活并维持一定的生长．低浓度的盐胁迫（80mmol·L^-1）对其生长非但不抑制反而具有刺激作用．从RGR等胁变指标来看，在相同盐浓度下，碱胁迫对碱地肤的胁迫强度大于盐胁迫，碱地肤对碱胁迫所做出的胁变反应均大于对盐胁迫的反应．以此可推断，碱胁迫甚于盐胁迫，碱地肤的抗盐性大于抗碱性．

Effect of Saline-alkali Stress on Growth Charactcristics of Alkali Resistance Halophyte Kochia sievrsiana

The natural alkali-resistant halophytes, kochia sieversiana, was used as material is this experiment,. Artificial ecological simulation,0 - 400 mol·L^-1 salt stress（mole ratio 1 ： 1 NaCl and Na2SO4）and alkali stress（mole ratio 1： 1 NaHCO3 and Na2CO3）,was imposed on kochia sieversiana. By measuring the relative growth rate（RGR） ,and other indicators of physiological response to analyze features of its salt resistant, high alkalic resistant with a view to clarifying its physiological basis of ecological positioning. The results showed： kochia sieversiana not only has strong salt resistance but also alkali resistance, In 400 mmol· L^-1 salt stress or alkali stress kochia sieversiana still can survive and maintain certain growth. Low intensity salt stress（80 mmol·L^-1） not inhibit on growth of kochia sieversiana but has a stimulating effect. From RGR and other indexes, alkali stress harm was greater than salt stress on kochia sieversiana in the same salt concentrations,, so did response of kochia sieversiana to the two stress. These results indicated that salt tress was greater than alkali stress, but alkali resistance of Kochia sieversian awas bigger than salt resistance.