松嫩平原碱化草甸朝鲜碱茅、猿毛耐盐碱特性的比较研究

本研究通过野外调查与室内实验相结合的方法，从生态学、生理学方面探讨了松嫩平原碱化草甸朝鲜碱茅和獐毛耐盐碱的特性。结果表明：两种植物均生长在含盐、潮湿而贫瘠的土壤上，朝鲜碱茅分布地段的土壤多含碱性盐（Ｎａ２ＣＯ３），而獐毛所在地的土壤则多含中性盐（ＮａＣｌ）．这些体现出它们对盐碱适应性的差异．不同浓度的ＮａＣｌ、Ｎａ２ＣＯ３胁迫对这两种植物的细胞膜透性、游离脯氨酸含量有明显影响，均以ｌｏｇｉｓｔｉｃ曲线ｙ＝ｋ／（１＋ｅ（ａ－ｂｘ））或直线方程：ｙ＝ａ＋ｂｘ形式较好地表达出来。说叫朝鲜碱茅对ＮａＣｌ的胁迫敏感，獐毛则对Ｎａ２ＣＯ３的胁迫敏感。两种植物在自然条件下的生态适应与实验条件下的生理适应相近。

COMPARATIVE STUDIES ON THE SALINE-ALKALI RESISTANT CHARACTERS IN PUCCINELLIA CHINAMPOENSIS AND AELUROPUS LITTORALIS VAR. SINENSIS OF ALKALIZATION MEADOW IN SONGNEN PLAIN

Using field investigations and laboratory experiments, the saline-alkali resistant characters in P. chinampoensis and A. littoralis var. sinensis of alkalization meadow in Songnen Plain were ecophysiologically studied. The results show that both plant species were able to grow in saline, moist and barren soil. The soil in which P. chinampoensis grew was itch in basic salt(Na2CO3)while the soil in which A. littoralis var. sinensis grew was rich in neutral salt (NaCl), indicating their difference in salinealkali resistant characters. The different stress of NaCl and Na2CO3 content had obvious effects on cell membrane permeability or proline content. The relationship between the stress bud cell membrane permeability or proline content could be expressed by logistic curve y=k/(1 e(a-bx))or straight line y=a bx. It illustrates that P. chinampoensis was sensitive to the stress due to NaCl. On the contrary, A. littoralis var.sinensis was sensitive to the stress due to Na2CO3. It was true for both species that the ecological adaptation to natural conditions was similar to the physiological adaptation to experimental conditions.