松嫩平原盐碱化草地羊草的生长适应性及耐盐生理特性的研究  

STUDIES ON THE ADAPTAEITY AND TO LERANCE OF LEYMUS CHINENSIS TO SALINITY IN SALINIZED GRASSLAND IN THE SONGNEN PLAIN

作　　者：王萍[1] 殷立娟[1] 李建东[1] 

机构地区：[1]东北师范大学草地所

出　　处：《生态学报》1994年第3期306-311,共6页Acta Ecologica Sinica

基　　金：国家自然科学基金

摘　　要：本文对不同程度盐碱生境下羊草的生物量及生理指标做了系统的分析研究。得出以下结论：羊草的生态分布幅度很宽，具有较强的适应盐碱生境的能力，在土壤的电导率为０．０７４─１．７４ｍＳ／ｃｍ，ｐＨ为８．４─１０．３土壤上均能正常生长。它对盐碱生境的适应性表现为大量吸收土壤中的无机离子和通过体内积累脯氨酸进行渗透调节。在土壤的电导率低于０．７ｍＳ／ｃｍ时，主要靠吸收无机离子进行调节，在土壤的电导率为０．７─１．２ｍＳ／ｃｍ时，靠脯氨酸积累和吸收无机离子共同进行调节。当土壤的电导率高于１．２ｍＳ／ｃｍ时，脯氨酸积累成为渗透调节主要因素。he biomass and physiological index of Leymus chinensis in different salty habitats areanalysized.The results show that L. chinensis distributes in a wide ecological variability,be-cause it can adapt to the habitats of different salinization gradients.It can grow well if soilhas a conductivity is reflected in uptaking inorganic ions and accumulating proline in a largemount to improve regulation of osmosis. When the conductivity is lower than 0. 7mS/cm,itmainly relies on uptaking inorganic ions to have such a regulation,When the conductivity isin the range of 0.7─1.2mS/cm,the regulation will be conducted by accumulating proline andinorganic ions while the conductivity is higher than 1.2mS/cm,accumulating proline becomesa main factor to ragulate osmosis.

关 键 词：羊草 盐碱生境 草地 生理生态学 

分 类 号：S812[农业科学—草业科学]