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青海西宁盆地两种披碱草属植物耐盐能力及水土保持能力研究
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Abstract:
为评价土壤盐渍化区植物水土保持能力和对盐渍土环境的适应能力，本项研究选取两种水土保持植物垂穗披碱草(Elymus nutans Griseb.)和老芒麦(Elymus sibiricus Linn.)为供试植物，通过室内种植的方式对这两种植物进行实验盆种植并对这两种植物开展盐胁迫试验，盐胁迫结束20 d后分别测定植物株高和干重，以及植物叶片脯氨酸含量、丙二醛含量、叶绿素含量和相对电导率以及单根抗拉强度，在此基础上以上述测定值及其增量为评价指标，借助于隶属函数对2种供试植物耐盐能力和水土保持能力进行评价，评价结果表明垂穗披碱草和老芒麦耐盐能力分别为0.54和0.52，且2种植物水土保持能力和耐盐能力综合评价值分别为0.55和0.48，即垂穗披碱草对盐渍土环境的适应能力和水土保持能力大于老芒麦。该研究结果可为土壤盐渍化地区开展水土保持治理、环境恢复和生态保护提供理论价值和思路，同时，亦可为类似地区开展上述工程试验提供实际指导。
To evaluate soil and water conservation and salt resistance capacities of plants in soil salinization regions, two herbs (Elymus nutans Griseb. and Elymus sibiricus Linn.) were selected as the tested species. Based on flower pot plantation, the seeds for the two species were planted in experimental bots and then treated with the salt solution after germination. 20 days after salt solution treatment, the plant height, dry weight, pro concentration, MDA concentration, chlorophyll concentration and relative electronic conductivity in the foliage of and the tensile strength of the two species were determined, based on which comprehensive evaluation method was used to assess the water and soil conservation and salt resistance capacities of the two species. The results show the score (reflecting the water and soil conservation and salt resistance capacities of the two species was calculated using membership function) for E. nutans to resist salt stress is 0.52, and the score for E. sibiricus is 0.52. And the scores for E. nutans to resist salt stress and conserve soil and water is 0.55 and the score for E. sibiricus is 0.48, indicating that E. nutans play a more significant role than E. sibiricus in salt stress tolerance and soil and water conservation. The result can be used as a guidance in regions subject to soil salinization to reduce soil erosion and land acclamation.
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