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《Acta Pratacultural Science》 1993-01
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An Analysis of a Main Salt of Alkalizing Meadow Steppe Na_2CO_3—Harming Factors to Leymus Chinensis

Yin Lijuan Shi Decheng (Grassland Research Institute,Northeast Normal University,Changchun)  
Using ecological simulated experiment,the harming factors of Na_2CO_3,which is a main salt of causingthe saline—alkali condition of meadow steppe in Northeast China,to Leymus chinensis have been analysed.The purpose is to expose the action of Na_2CO_3—harming to Leymns chinensis and to seek a way to solve it.Leymus chinensis seedlings grown in nutrient solution were respectively treated with 10mmol/L Na_2CO_3,thesingle factors as osmosis,pH,and Na~+ of equal strength to the corresponding factor of 10 mmol/LNa_2CO_3,and neutralized Na_2CO_3 by adding phosphatidic acid.Some strain indexes,including relativegrowth rate,the contents of accumulative proline and chlorophyll,relative permeability,and the contentsof K~+ and Na~+,were determined after 7 d treated.The role of every factor in the Na_2CO_3—harming and their interrelation were analysed by comparingthe harmed degrees under different treatments.The results showed that high pH caused by Na_2CO_3 was thefirst harming factor to Leymus chinensis,the ionic effects of Na~+ were the second,the osmotic effects werenegligible comparing with the two formers.The harming action of Na_2CO_3 to Leymus chinensis can be obviously relaxed by neutralizing withphosphatidic acid to reduce the high pH of Na_2CO_3.
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