中性盐和碱性盐对羊草幼苗胁迫的研究

Studines of Stresses of Neutral and Alkaline Salts on Aneurolepidium chinense Seedling

用含不同浓度的中性盐（Ｎａｃｌ）和碱性盐（Ｎａ２ＣＯ３＋Ｎａｃｌ）的营养液，模拟土壤盐碱化条件，观察和分析耐盐牧草羊草（Ａｎｅｕｒｏｌｅｐｉｄｉｕｍｃｈｉｎｅｎｓｉｓ）的生长、生理和代谢变化，并对有关生理指标建立了数学模型。结果表明，羊草对中性盐、碱性盐适应方式以耐胁变性为主，盐胁迫首先作用于细胞膜，羊草幼苗以吸收无机离子进行渗透调节。当盐胁迫增加到一定程度时，脯氨酸的积累起到重要的渗透调节作用。中性盐和碱性盐胁迫对羊草幼苗生理效应不同：羊草幼苗对低浓度中性盐胁迫反应比较敏感，相比之下对低浓度的碱性盐胁迫反应较为迟钝；但在高浓度下，两种盐对羊草幼苗都产生了相当程度的危害，其中受碱性盐的危害更为严重，因为碱性盐胁迫下除了Ｎａ＋作用外又增加了高ｐＨ的作用。

By using nutrient solution with different concentration of neutral saIt(NaCl)and alkaline salt(Na2CO3)to simulate soil salinlzation,the plant growth,phyto一physiology and metabolism of Aneurolepidiumchinense were observed and analysed , and meantimely its corresponding mathematical models were deter-mined.The results showed that Aneurolepidium chinense was adapted to saliniztion by the stress tolerances ofboth neutral salts and alkaline salts altogether,where salt stresses were acted on cell membrane at first,andthen the grass seedling absorbed the inorganic ion for permeability regulation。With the increasing of salt stre-sses,accumulating proline mainly offered great effect on regulating cell permeability to a certain extent.Thephysiological effect of Aneurolepidium chinense seedling on neutral and alkaline stresses was somewhat differentin significance level.It showed that the grass species seedling for trial was more sensitive to neutral saIt stre-ss and relatively less sensitive to alkaline salt stress whenever under low salt con cen tration sol ution,Butthese two different kinds of salts,either neutral or alkaline,all did much greater harm to AneurolepidiumChinense seedling under high salt concentration solution,Especially,the harm done by alkahlin salt was moreserious,because under alkaline stress,not only Na+,but also high pH,all tended to show similar effect onthe grass species tested。